Difference between revisions of "HSTV-L"

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{{Specs-Card
 
{{Specs-Card
 
|code=us_hstv_l
 
|code=us_hstv_l
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|images={{Specs-Card-Image|GarageImage_{{PAGENAME}}.jpg}}
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|images={{Specs-Card-Image|GarageImage_{{PAGENAME}}.jpg|ArtImage_{{PAGENAME}}.jpg}}
 
}}
 
}}
  
 
== Description ==
 
== Description ==
 
<!-- ''In the description, the first part should be about the history of the creation and combat usage of the vehicle, as well as its key features. In the second part, tell the reader about the ground vehicle in the game. Insert a screenshot of the vehicle, so that if the novice player does not remember the vehicle by name, he will immediately understand what kind of vehicle the article is talking about.'' -->
 
<!-- ''In the description, the first part should be about the history of the creation and combat usage of the vehicle, as well as its key features. In the second part, tell the reader about the ground vehicle in the game. Insert a screenshot of the vehicle, so that if the novice player does not remember the vehicle by name, he will immediately understand what kind of vehicle the article is talking about.'' -->
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The '''{{Specs|name}}''' is a rank {{Specs|rank}} American light tank {{Battle-rating}}. It was introduced in [[Update "Starfighters"]].
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The '''High Survivability Test Vehicle – Lightweight (HSTV-L)''' is a light gun system testbed developed in the late 1970s as part of the larger joint U.S. Army and U.S. Marine Corps – Advanced Anti-Armour Vehicle Evaluation (ARMVAL) program, which aimed to explore concepts for future armoured fighting vehicles with a focus on lightweight vehicles. The HSTV-L was created to operationally test the concept of using high speed to enhance a vehicle's survivability rather than heavy armour. It was also used to test a number of new tank technologies, the most notable of which was an automatic main gun - a 75 mm ARES XM274 smoothbore rapid-fire hyper-velocity tank gun. The whole system was nicknamed ELKE (Elevated Kinetic Energy Vehicle). The ARES concept was to fire several high-velocity armour-piercing rounds at an enemy main battle tank (MBT) in a short period of time in order to break through its composite armour. Only one HSTV-L testbed was built and tested until the mid-1980s. Unfortunately, by the time the HSTV-L was tested, the U.S. Army had determined that the ARES cannon would be ineffective against newer Soviet tanks and decided that the 105 mm Royal Ordnance L7 tank gun was the minimum calibre for light gun systems. The Marines were also not confident that the ARES would be effective, particularly in their beach-landing role in breaking through enemies' heavy defences.
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Introduced in [[Update "Starfighters"]], the HSTV-L offers a unique gameplay experience in top-tier U.S. Army ground forces. The HSTV-L, which has a two-plane fully automatic stabilisation system, laser rangefinder, thermal imaging equipment, and an autoloader that can reload in as little as 1.5 seconds, holds a lot of potential as a hard-hitting flanking vehicle on a heavily contested battlefield. Because of the unusual main gun arrangement, the HSTV-L also provides excellent gun depression if the battlefield is mountainous. However, due to the small calibre of its main gun, it may struggle to engage some MBTs frontally, limiting its overall versatility.
  
 
== General info ==
 
== General info ==
 
=== Survivability and armour ===
 
=== Survivability and armour ===
 
{{Specs-Tank-Armour}}
 
{{Specs-Tank-Armour}}
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<!-- ''Describe armour protection. Note the most well protected and key weak areas. Appreciate the layout of modules as well as the number and location of crew members. Is the level of armour protection sufficient, is the placement of modules helpful for survival in combat? If necessary use a visual template to indicate the most secure and weak zones of the armour.'' -->The HSTV-L is a very lightly-armoured vehicle. The HSTV-L also has hull break, if any "solid" module were to get hit (e.g. gun breech or engine/transmission) the vehicle will be hull broken. Depending on where you get shot you might lose 1 crew member but you will still be alive. If you get shot on the left side of the vehicle from the front, the chances of your ammo rack detonating greatly increases. Best case scenario for this vehicle is to not get hit in the first place.
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<!-- ''Describe armour protection. Note the most well protected and key weak areas. Appreciate the layout of modules as well as the number and location of crew members. Is the level of armour protection sufficient, is the placement of modules helpful for survival in combat? If necessary use a visual template to indicate the most secure and weak zones of the armour.'' -->
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The HSTV-L is a very lightly-armoured vehicle. Depending on where you get shot you might lose 1 crew member but you will still be alive. If you get shot on the left side of the vehicle from the front, the chances of your ammo rack detonating greatly increases. Best case scenario for this vehicle is to not get hit in the first place.
  
 
{| class="wikitable"
 
{| class="wikitable"
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! Armour !! Front (Slope angle) !! Sides !! Rear !! Roof
 
! Armour !! Front (Slope angle) !! Sides !! Rear !! Roof
 
|-
 
|-
−
| Hull || 25.4 mm (80°) ''Upper Glacis'' <br> {{annotation|25.4 mm|Estimated through calculation of effective thickness at angle.}} (55°) ''Lower Glacis (Upper Part)'' <br> {{annotation|25.4 mm|Estimated through calculation of effective thickness at angle.}} (78°) ''Lower Glacis (Lower Part)''  
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| Hull || 25.4 mm (80°) ''Upper Glacis'' <br> {{annotation|25.4 mm|Estimated through calculation of effective thickness at angle.}} (55°) ''Lower Glacis (Upper Part)'' <br> {{annotation|25.4 mm|Estimated through calculation of effective thickness at angle.}} (78°) ''Lower Glacis (Lower Part)''
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| 25.4 mm ''Upper Sponson Side'' <br> 19 mm ''Lower Sponson Side'' <br> 38.1 mm ''Lower Hull Side''  
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| 25.4 mm ''Upper Sponson Side'' <br> 19 mm ''Lower Sponson Side'' <br> 38.1 mm ''Lower Hull Side''
 
| 25.4 mm || 19 mm ''Engine Compartment'' <br> 5 mm ''Radiator Vents''
 
| 25.4 mm || 19 mm ''Engine Compartment'' <br> 5 mm ''Radiator Vents''
 
|-
 
|-
−
| Turret || 25.4 mm ''Turret front'' <br>25.4 mm ''Gun mantlet'' || 25.4 mm || 25.4 mm || 25.4 mm
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| Turret || 25.4 mm ''Turret front'' <br>25.4 mm ''Gun mantlet'' || 25.4 mm || 25.4 mm || 25.4 mm
 
|-
 
|-
−
| Cupola || colspan="4" | 25.4 mm  
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| Cupola || colspan="4" | 25.4 mm
 
|-
 
|-
 
|Additional Armour
 
|Additional Armour
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|-
 
|-
 
|}
 
|}
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'''Notes:'''
 
'''Notes:'''
  
 
* Lower glacis (both parts) is variable thickness armour.
 
* Lower glacis (both parts) is variable thickness armour.
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* Upper glacis and frontal sponson sides appliqué armour is variable thickness armour.
 
* Upper glacis and frontal sponson sides appliqué armour is variable thickness armour.
  
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{{tankMobility|abMinHp=1,007|rbMinHp=575}}
 
{{tankMobility|abMinHp=1,007|rbMinHp=575}}
  
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The HSTV-L has a very good power-to-weight ratio making the vehicle decently fast. The vehicle utilizes a 648 HP gas turbine engine. The HSTV-L is very manoeuvrable due to the gas turbine engine and can get to flanking spots early in the game.
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The HSTV-L has a very good power-to-weight ratio making the vehicle decently fast. The vehicle utilizes a 648 HP gas turbine engine. The HSTV-L is very manoeuvrable due to the gas turbine engine and can get to flanking spots early in the game. However, caution must be taken in regards to the loud engine noise, especially when trying to avoid drawing the attention of enemy players to you.
  
 
=== Modifications and economy ===
 
=== Modifications and economy ===
 
{{Specs-Economy}}
 
{{Specs-Economy}}
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'''<big>Unlock order recommendations</big>'''
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The order of modifications should be well thought out. Below is a guide of which modifications to unlock first, but it is just a recommendation and can be modified or adapted depending on the tank commander's preferences.
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'''Tier 1'''
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Tier 1 only has useful modifications but the number one priority should be parts which allows the tank to repair during battle, something that comes in handy in a majority of battles. After that tracks is something that could be researched second as its mobility is more reliant on the tracks upgrade than the firepower is on horizontal drive.
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'''Tier 2'''
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Moving on to tier 2, this tier is harder to pick modifications from because in general they are less useful modifications, but only two are needed before moving to tier 3. FPE and adjustment of fire are the likeliest candidates except in cases where the goal is to use the scouting ability to spawn planes, in which either of the two could be replaced by airstrike. It's best to move on to tier 3 after two tier 2 modifications are researched.
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'''Tier 3'''
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In tier 3 it gets more interesting with a number of useful modifications; three modifications are needed to get to tier 4. All the modifications in this tier are useful so some hard choices have to be made. Due to a decent stock elevation speed the elevation mechanism mod isn't strictly necessary and can be put off until later. Smoke grenades are good for concealing the vehicle to make a hasty escape or try to prevent the enemy from hitting the tank, the laser rangefinder is useful for making accurate shots at range which is also very important as the gun does not have much penetration so well aimed shots are necessary, crew replenishment is useful as always, and filters are beneficial to the mobility. It's recommended to unlock laser rangefinder and smoke grenades and then choose between filters and crew replenishment before then moving on to tier 4.
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'''Tier 4'''
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The most important modifications in tier 4 are NVD to give access to thermal sights for easier spotting of enemies and also the engine modification which greatly increases mobility.
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'''Finishing up'''
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After tier 4 is unlocked and the priority modifications there are unlocked it is time to clean up the remaining modifications. The order of unlocking modifications at this point is less important but there are a few that should be left until last - suspension and brake system which are generally the least important modifications on any given ground vehicle.
  
 
== Armaments ==
 
== Armaments ==
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{| class="wikitable" style="text-align:center" width="100%"
 
{| class="wikitable" style="text-align:center" width="100%"
 
|-
 
|-
−
! colspan="5" | [[XM274 (75 mm)|75 mm XM274]] || colspan="5" | Turret rotation speed (°/s) || colspan="4" | Reloading rate (seconds)
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! colspan="5" | [[XM274 (75 mm)|75 mm XM274]] || colspan="5" | Turret rotation speed (°/s) || Reloading rate (seconds)
 
|-
 
|-
 
! Mode !! Capacity !! Vertical !! Horizontal !! Stabilizer
 
! Mode !! Capacity !! Vertical !! Horizontal !! Stabilizer
 
! Stock !! Upgraded !! Full !! Expert !! Aced
 
! Stock !! Upgraded !! Full !! Expert !! Aced
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! Stock !! Full !! Expert !! Aced
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!Autoloader
 
|-
 
|-
 
! ''Arcade''
 
! ''Arcade''
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| rowspan="2" | 26 || rowspan="2" | -17°/+45° || rowspan="2" | ±180° || rowspan="2" | Two-plane || 54.3 || 75.1 || 91.2 || 100.9 || 107.3 || rowspan="2" | 1.5 || rowspan="2" | 1.5 || rowspan="2" | 1.5 || rowspan="2" | 1.5
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| rowspan="2" | 26 || rowspan="2" | -17°/+45° || rowspan="2" | ±180° || rowspan="2" | Two-plane || 54.3 || 75.1 || 91.2 || 100.9 || 107.3 || rowspan="2" | 1.50
 
|-
 
|-
 
! ''Realistic''
 
! ''Realistic''
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==== Ammunition ====
 
==== Ammunition ====
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{| class="wikitable" style="text-align:center" width="100%"
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{{:XM274 (75 mm)/Ammunition|XM885}}
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! colspan="8" | Penetration statistics
 
−
|-
 
−
! rowspan="2" data-sort-type="text" | Ammunition
 
−
! rowspan="2" | Type of<br>warhead
 
−
! colspan="6" | '''Penetration @ 0° Angle of Attack (mm)'''
 
−
|-
 
−
! 10 m !! 100 m !! 500 m !! 1,000 m !! 1,500 m !! 2,000 m
 
−
|-
 
−
| XM885 || APFSDS || 276 || 269 || 262 || 252 || 243 || 234
 
−
|-
 
−
|}
 
−
{| class="wikitable" style="text-align:center" width="100%"
 
−
! colspan="10" | Shell details
 
−
|-
 
−
! rowspan="2" data-sort-type="text" | Ammunition
 
−
! rowspan="2" | Type of<br>warhead
 
−
! rowspan="2" | Velocity<br>(m/s)
 
−
! rowspan="2" | Projectile<br>Mass (kg)
 
−
! rowspan="2" | Fuse delay<br>(m)
 
−
! rowspan="2" | Fuse sensitivity<br>(mm)
 
−
! rowspan="2" | Explosive Mass<br>(TNT equivalent) (g)
 
−
! colspan="3" | Ricochet
 
−
|-
 
−
! 0% !! 50% !! 100%
 
−
|-
 
−
| XM885 || APFSDS || 1,463 || 2.2 || N/A || N/A || N/A || 78° || 80° || 81°
 
−
|-
 
−
|}
 
  
 
==== [[Ammo racks]] ====
 
==== [[Ammo racks]] ====
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The HSTV-L is a light tank with a quick ready-rack reload, making it adept at dealing with multiple enemies in ambush situations. It can achieve a very good top speed thanks to its light weight and has a similarly good turning ability. With this mobility (which is on par with that of top MBTs), the HSTV-L can achieve desirable early-game positions and move quickly around the map when necessary.
 
The HSTV-L is a light tank with a quick ready-rack reload, making it adept at dealing with multiple enemies in ambush situations. It can achieve a very good top speed thanks to its light weight and has a similarly good turning ability. With this mobility (which is on par with that of top MBTs), the HSTV-L can achieve desirable early-game positions and move quickly around the map when necessary.
  
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Like most light tanks, this vehicle is lacking in the protection department. It has thin armour in all directions, which is not backed up by any spaced or composite protection, and is susceptible to hull-break. In some situations, the armour may be thin enough that kinetic rounds overpenetrate and pass straight through the vehicle without causing much damage. The highly-angled armour can also sometimes bounce shots. In most cases though, the HSTV-L cannot be counted on to sustain heavy fire.
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Like most light tanks, this vehicle is lacking in the protection department. It has thin armour in all directions, which is not backed up by any spaced or composite protection, and is susceptible to overpressure damage. In some situations, the armour may be thin enough that kinetic rounds overpenetrate and pass straight through the vehicle without causing much damage. The highly-angled armour can also sometimes bounce shots. In most cases though, the HSTV-L cannot be counted on to sustain heavy fire.
  
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This tank is fairly unique in that it is equipped with an autoloader with a 6-round ready-rack. This means that the first 6 shots fired from the HSTV-L can come in very rapid succession--the reload time for these shells is a mere 1.5 seconds. After these first rounds, the ready-rack is empty and the reload time increases dramatically. The player must take this into account when deciding which enemies to engage. The HSTV-L can pull off short bursts of high firepower, but needs time to replenish its ready-rack. The shell itself, an APFSDS round, is decent, but may have trouble penetrating the frontal armour of top MBTs. This combined with the vehicle's poor armour means that head-on attacks are rarely advisable.
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This tank is fairly unique in that it is equipped with an autoloader that can fire every 1.5 seconds, without ever needing to stop to replenish a ready-rack.The shell itself, an APFSDS round, is decent, but may have trouble penetrating the frontal armour of top MBTs. This combined with the vehicle's poor armour means that head-on attacks are rarely advisable, but with the quick reload, multiple shots into an enemy's sides or rear will be very effective.
  
 
The HSTV-L is better suited to firing at enemies without their noticing--from ambush positions, from the flanks, and from behind corners. The vehicle's great mobility will aid with this playstyle. Indeed, its mobility is what makes the HSTV-L great on urban maps. Furthermore, in ambush situations the tank is able to easily deal with multiple enemies thanks to its fast ready-rack reload. This tank has a 45 degree gun elevation and a 17 degree gun depression. This gun depression is extremely powerful, and makes the vehicle very effective at hill camping and at firing from behind ridgelines. A thermal sight in both gunner and commander/binocular views makes the HSTV-L a great scouting vehicle. It is recommended to use the vehicle's high mobility to aid in scouting enemies for teammates to locate and destroy.
 
The HSTV-L is better suited to firing at enemies without their noticing--from ambush positions, from the flanks, and from behind corners. The vehicle's great mobility will aid with this playstyle. Indeed, its mobility is what makes the HSTV-L great on urban maps. Furthermore, in ambush situations the tank is able to easily deal with multiple enemies thanks to its fast ready-rack reload. This tank has a 45 degree gun elevation and a 17 degree gun depression. This gun depression is extremely powerful, and makes the vehicle very effective at hill camping and at firing from behind ridgelines. A thermal sight in both gunner and commander/binocular views makes the HSTV-L a great scouting vehicle. It is recommended to use the vehicle's high mobility to aid in scouting enemies for teammates to locate and destroy.
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'''Pros:'''
 
'''Pros:'''
  
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* Thanks to the autoloader (7 shots), the cannon has a very good rate of fire with 1.5s reload time
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* Thanks to the autoloader, the cannon has a very high rate of fire
 
* Due to its light armour some kinetic rounds may over penetrate, leaving it undamaged
 
* Due to its light armour some kinetic rounds may over penetrate, leaving it undamaged
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* Excellent urban fighting vehicle as in up-tiers, side shots are much more effective
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* Excellent in urban combat where side shots are much more effective
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* Internal 30 mm armour can help protect crew from spalling
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* Internal 5 mm armour can help protect crew from spalling
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* Thermal sight for both gunner and commander = Great scouting vehicle
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* Thermal sights for both the gunner and the commander make it a great scouting vehicle especially with its scout UAV, also with thermals
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* Up to 45° elevation and -17° depression over the frontal arc
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** Its scout UAV has better thermals than the HSTV-L itself
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* Up to 45° elevation and -30° depression over the sides (-17° depression to the front, -6° depression when facing rear)
 
* Very good gun handling
 
* Very good gun handling
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* Turret has only one crew member, the commander, and the breech is small
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* Excellent mobility, allowing it to keep up with and even outpace MBTs
  
 
'''Cons:'''
 
'''Cons:'''
  
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* Susceptible to the "Hull Break" mechanic
 
 
* Commander's cupola can be penetrated by heavy machine gun fire
 
* Commander's cupola can be penetrated by heavy machine gun fire
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* Limited ammo capacity, with only 26 rounds
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* Limited ammo selection and capacity
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* Fire rate decreases severely after the reasy rack is depleted, as replenishing the autoloader requires roughly 15 seconds per shell
 
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* Limited ammo selection; can only fire APFSDS
 
 
* APFSDS round has low penetration and has problems penetrating frontal armour of some MBTs
 
* APFSDS round has low penetration and has problems penetrating frontal armour of some MBTs
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* The XM855 APFSDS dart causing minimum damage to modules or crew members after penetration due to its calibre
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* The XM855 APFSDS dart causes minimal damage to modules or crew members after penetration due to its calibre (reduced spall)
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* Average mobility even with 32 hp/t and low ground pressure
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* Prone to overpressure
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* Does not have access to a heavy machine gun
  
 
== History ==
 
== History ==
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'''<big>Development</big>'''
 
'''<big>Development</big>'''
  
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The High Survivability Test Vehicle - Lightweight, shortened to HSTV-L, was a light tank project that was developed in the 1970’s and 1980’s. It was funded by the Defense Advanced Research Projects Agency (DARPA) and built by the AAI Corporation. The prototype was completed in September 1979 and began field trials soon after. After the field trials the HSTV-L was used for testing of the fire control system (FCS) with different stabilization algorithms tested as well as the hunter-killer sights. The HSTV-L was not chosen for production by the Army or the Marine Corps and was cancelled in 1981. It was later developed into the Rapid Deployment Force Light Tank (RDF/LT).
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The High Survivability Test Vehicle - Lightweight, shortened to HSTV-L, was a light tank project that was developed in the 1970s and 1980s. It was funded by the Defense Advanced Research Projects Agency (DARPA) and built by the AAI Corporation. The prototype was completed in September 1979 and began field trials soon after. After the field trials the HSTV-L was used for testing of the fire control system (FCS) with different stabilization algorithms tested as well as the hunter-killer sights. The HSTV-L was not chosen for production by the Army or the Marine Corps and was cancelled in 1981. It was later developed into the Rapid Deployment Force Light Tank (RDF/LT).
  
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'''<big>Design</big>'''
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'''Design'''
  
 
'''General'''
 
'''General'''
  
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The HSTV-L design was based around an incredibly low profile hull and turret with very shallow angles on the frontal portion, in order to deflect projectiles fired at it. The HSTV-L had a crew of 3, with the driver and gunner side by side in the hull front and the commander in the left side of the turret, all of whom sat semi-reclined. All 3 crew members had the ability to fire the gun and both the gunner and driver’s position could drive the vehicle. The vehicle had a length of 8.528 m with gun forward and the hull had a length of 5.918 m. The height was only 2.414 m including the equipment on the turret roof, being 1.994 m to the top of the turret and 1.422 m to the top of the hull. The width was 2.794 meters. The vehicle had a combat weight of 14.5 tonnes or up to 17.0 tonnes when equipped with an appliqué armor package. During testing the HSTV-L was fitted with additional equipment for data collection and weighed 20.45 tonnes. The HSTV-L could be airlifted, underslung, by a CH-53 Sea Stallion helicopter when at the weight of 14.5 tonnes.
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The HSTV-L design was based around an incredibly low profile hull and turret with very shallow angles on the frontal portion, in order to deflect projectiles fired at it. The HSTV-L had a crew of 3, with the driver and gunner side by side in the hull front and the commander in the left side of the turret, all of whom sat semi-reclined. All 3 crew members had the ability to fire the gun and both the gunner and driver's position could drive the vehicle. The vehicle had a length of 8.528 m with gun forward and the hull had a length of 5.918 m. The height was only 2.414 m including the equipment on the turret roof, being 1.994 m to the top of the turret and 1.422 m to the top of the hull. The width was 2.794 m. The vehicle had a combat weight of 14.5 tonnes or up to 17.0 tonnes when equipped with an appliqué armour package. During testing the HSTV-L was fitted with additional equipment for data collection and weighed 20.45 tonnes. The HSTV-L could be airlifted, underslung, by a CH-53 Sea Stallion helicopter when at the weight of 14.5 tonnes.
  
 
'''Mobility and Power'''
 
'''Mobility and Power'''
  
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The HSTV-L was propelled by a 650 horsepower (485 kilowatt) Avro-Lycoming gas turbine powerplant and an Allison X-300-4A transmission with four forward and one reverse gear. There were five road wheels on each side and the tracks were 450 mm wide. The suspension was built by National Water Lift, being hydropneumatic but not variable; in other words the height could not be adjusted. The ground clearance of the HSTV-L was 0.508 meters. The HSTV-L could pivot in place while in neutral gear, and it carried a fuel load of 409 liters giving it a cruising range of 160 kilometers. It could accelerate from 0 to 48 kph in 11.8 seconds and had a maximum speed of 83.68 kilometers per hour.
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The HSTV-L was propelled by a 650 horsepower (485 kilowatt) Avro-Lycoming gas turbine powerplant and an Allison X-300-4A transmission with four forward and two reverse gears. The transmission had a torque converter. There were five road wheels on each side and the tracks were 450 mm wide. The suspension was built by National Water Lift, being hydropneumatic but not variable; in other words the height could not be adjusted. The ground clearance of the HSTV-L was 0.508 m. The HSTV-L could pivot in place while in neutral gear, and it carried a fuel load of 409 liters giving it a cruising range of 160 km. It could accelerate from 0 to 48 km/h in 11.8 seconds and had a maximum speed of 83.68 km/h.
  
 
In addition to the main propulsion system there were two 250 ampere generators providing auxiliary power as well as a 60 gpm hydraulic pump. The hydraulic pump was used to power an oil cooler fan mounted in the engine compartment as well as the gun control system and automatic loading system.
 
In addition to the main propulsion system there were two 250 ampere generators providing auxiliary power as well as a 60 gpm hydraulic pump. The hydraulic pump was used to power an oil cooler fan mounted in the engine compartment as well as the gun control system and automatic loading system.
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'''Armament and FCS'''
 
'''Armament and FCS'''
  
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The main armament of the HSTV-L was an ARES 75 mm XM274 gun mounted in a rotating turret. 26 rounds of ammunition were provided of both depleted-uranium APFSDS-T and multi-flechette anti-aircraft rounds. The gun was loaded by an automatic loading system which provided the HSTV-L with a high rate of fire.
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The main armament of the HSTV-L was an ARES 75 mm XM274 gun mounted in a rotating turret. 26 rounds of ammunition were provided of both depleted-uranium APFSDS-T and multi-fléchette anti-aircraft rounds. The gun was loaded by an automatic loading system which provided the HSTV-L with a high rate of fire.
  
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Secondary armament was provided by a coaxial 7.62 mm M240 machine gun and a second 7.62 mm M240 machine gun pintle-mounted on the commander’s cupola. A total of 3,200 rounds of 7.62 mm ammunition was split between the two machine guns.
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Secondary armament was provided by a coaxial 7.62 mm M240 machine gun and a second 7.62 mm M240 machine gun pintle-mounted on the commander's cupola. A total of 3,200 rounds of 7.62 mm ammunition was split between the two machine guns.
  
 
The turret could rotate a full 360 degrees at a speed of 57 degrees per second. The gun could elevate 45 degrees but the depression depended on which direction the turret faced; over the front the gun could depress 17 degrees, 30 degrees over the side, and 6 degrees over the rear of the vehicle. Manual backup was provided for turret traverse and gun elevation but the rate at which they moved was much slower when manual than with power. The main gun was two-plane stabilized, with both the stabilization and gun control systems having been produced by Cadillac Gage.
 
The turret could rotate a full 360 degrees at a speed of 57 degrees per second. The gun could elevate 45 degrees but the depression depended on which direction the turret faced; over the front the gun could depress 17 degrees, 30 degrees over the side, and 6 degrees over the rear of the vehicle. Manual backup was provided for turret traverse and gun elevation but the rate at which they moved was much slower when manual than with power. The main gun was two-plane stabilized, with both the stabilization and gun control systems having been produced by Cadillac Gage.
  
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The hunter/killer fire control system (FCS) was designed and built by Texas Instruments. The commander received a stabilized commander’s independent thermal viewer (CITV) which could rotate independently of the turret and included both TV and thermal imaging. The gunner also received a stabilized sight, though this one was slaved to the gun, which included thermal and TV imaging as well, along with an eye safe CO2 laser rangefinder built by Raytheon. This hunter/killer system allowed the commander to locate a target with the hunter sight. Once a target was located the gunner would use his killer sight to fire on the target while the commander began to search for the next target. The fire control system (FCS) used the sights, crosswind sensor, muzzle reference system, vertical reference system, and laser rangefinder to automatically determine the firing solution, leaving the gunner only to fire the gun. The fully stabilized main gun along with advanced FCS allowed the HSTV-L a high first hit probability and high accuracy on the move.
+
The hunter/killer fire control system (FCS) was designed and built by Texas Instruments. The commander received a stabilized commander's independent thermal viewer (CITV) which could rotate independently of the turret and included both TV and thermal imaging. The gunner also received a stabilized sight, though this one was slaved to the gun, which included thermal and TV imaging as well, along with an eye safe CO2 laser rangefinder built by Raytheon. This hunter/killer system allowed the commander to locate a target with the hunter sight. Once a target was located the gunner would use his killer sight to fire on the target while the commander began to search for the next target. The fire control system (FCS) used the sights, crosswind sensor, muzzle reference system, vertical reference system, and laser rangefinder to automatically determine the firing solution, leaving the gunner only to fire the gun. The fully stabilized main gun along with advanced FCS allowed the HSTV-L a high first hit probability and high accuracy on the move.
  
−
The driver and gunner are given a screen that displays the imaging of the hunter sight which allows them to operate independently of a vehicle commander if necessary. Theoretically, the HSTV-L could be controlled entirely by only one crew member from either the driver or gunner’s position since both had driving and gunnery controls.
+
The driver and gunner are given a screen that displays the imaging of the hunter sight which allows them to operate independently of a vehicle commander if necessary. Theoretically, the HSTV-L could be controlled entirely by only one crew member from either the driver or gunner's position since both had driving and gunnery controls.
  
 
=== [[wt:en/news/6711-development-hstv-l-view-of-tomorrow-en|Devblog]] ===
 
=== [[wt:en/news/6711-development-hstv-l-view-of-tomorrow-en|Devblog]] ===
−
By the mid 1970’s, the US military initiated a series of studies which looked into the development of new concepts and designs for tanks which combined good firepower and survivability. The latter of which was to be achieved through a smaller size, rather than heavy armor protection.
+
By the mid 1970s, the US military initiated a series of studies which looked into the development of new concepts and designs for tanks which combined good firepower and survivability. The latter of which was to be achieved through a smaller size, rather than heavy armour protection.
  
−
As at the time, both the US Army and USMC were looking into possible replacements for their M551 Sheridan and M50 Ontos tanks respectively, the two military branches joined forces in a joint research programme dubbed “ARMVAL” (Advanced Antiarmor Vehicle Evaluation). The vehicles developed under this programme would be used as test beds for various new concepts and ideas in an effort to gain new experiences, which would in turn be used in the development of future tank designs.
+
As at the time, both the US Army and USMC were looking into possible replacements for their M551 Sheridan and M50 Ontos tanks respectively, the two military branches joined forces in a joint research programme dubbed "ARMVAL" (Advanced Antiarmor Vehicle Evaluation). The vehicles developed under this programme would be used as test beds for various new concepts and ideas in an effort to gain new experiences, which would in turn be used in the development of future tank designs.
  
−
One of the later products of this experimental programme was the HSTV-L - a compact, lightweight, highly mobile tank design, fitted with an autoloaded 75mm smoothbore cannon, designed to fire kinetic ammunition in short bursts in order to wear down and ultimately defeat composite armor screens. The HSTV-L was built in 1979 and underwent various trials until 1981.
+
One of the later products of this experimental programme was the HSTV-L - a compact, lightweight, highly mobile tank design, fitted with an autoloaded 75 mm smoothbore cannon, designed to fire kinetic ammunition in short bursts in order to wear down and ultimately defeat composite armour screens. The HSTV-L was built in 1979 and underwent various trials until 1981.
  
−
At the start of the 1980’s, the 75mm gun was considered inadequate to deal with the most recent Soviet MBTs by the Army, while the USMC questioned the vehicle’s effectiveness in amphibious landing operations. This led to the ultimate discontinuation of the collaborative project in 1981.
+
At the start of the 1980s, the 75 mm gun was considered inadequate to deal with the most recent Soviet MBTs by the Army, while the USMC questioned the vehicle's effectiveness in amphibious landing operations. This led to the ultimate discontinuation of the collaborative project in 1981.
  
 
== Media ==
 
== Media ==
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;Skins
 
;Skins
  
−
* [https://live.warthunder.com/feed/camouflages/?vehicleCountry=usa&vehicleType=tank&vehicleClass=light_tank&vehicle=us_hstv_l Skins and camouflages for the {{PAGENAME}} from live.warthunder.com.]
+
* [https://live.warthunder.com/feed/camouflages/?vehicle=us_hstv_l Skins and camouflages for the {{PAGENAME}} from live.warthunder.com.]
  
−
'''Images'''<gallery mode="packed" heights="150">
+
;Images
 +
<gallery mode="packed" heights="150">
 
File:HSTV-L WTWallpaper 01.jpg|
 
File:HSTV-L WTWallpaper 01.jpg|
 
File:HSTV-L WTWallpaper 02.jpg|
 
File:HSTV-L WTWallpaper 02.jpg|
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;Videos
 
;Videos
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{{Youtube-gallery|C5cw-_dXhFE|'''The Shooting Range #203''' - ''Metal Beasts'' section at 00:30 discusses the {{PAGENAME}}.|6qzHOvgOWug|'''HSTV-L - Tank History and Review''' - ''Spookston''|PosWOnOGkSo|'''Best experimental vehicles''' discusses the {{PAGENAME}} at 4:00 - ''War Thunder Official Channel''}}
+
{{Youtube-gallery|qsHfTef-Xvg|'''The Shooting Range #293''' - ''Metal Beasts'' section at 00:28 discusses the {{PAGENAME}}.|C5cw-_dXhFE|'''The Shooting Range #203''' - ''Metal Beasts'' section at 00:30 discusses the {{PAGENAME}}.|6qzHOvgOWug|'''HSTV-L - Tank History and Review''' - ''Spookston''|PosWOnOGkSo|'''Best experimental vehicles''' discusses the {{PAGENAME}} at 4:00 - ''War Thunder Official Channel''}}
  
 
== See also ==
 
== See also ==
Line 235: Line 236:
 
* ''links to approximate analogues of other nations and research trees.'' -->
 
* ''links to approximate analogues of other nations and research trees.'' -->
  
−
* Tanks at similar positions in other tech trees:
+
;Light tanks at similar positions in other tech trees:
−
** [[VFM5|VFM 5]] - A British light tank
+
 
−
** [[CV 90105 TML|CV90105 TML]] - A Swedish light tank
+
* [[TAM 2C]]
−
** [[TAM 2C]] - A German light tank
+
* [[Object 685]]
−
** [[Object 685]] - A Russian light tank
+
* [[VFM5]]
 +
* [[CV 90105 TML]]
  
 
== External links ==
 
== External links ==
 
<!-- ''Paste links to sources and external resources, such as:''
 
<!-- ''Paste links to sources and external resources, such as:''
 
* ''topic on the official game forum;''
 
* ''topic on the official game forum;''
−
* ''encyclopedia page on the tank;''
 
 
* ''other literature.'' -->
 
* ''other literature.'' -->
  
 
* [[wt:en/news/6711-development-hstv-l-view-of-tomorrow-en|[Devblog] HSTV-L: View of Tomorrow]]
 
* [[wt:en/news/6711-development-hstv-l-view-of-tomorrow-en|[Devblog] HSTV-L: View of Tomorrow]]
−
* https://tanknutdave.com/the-american-hstvl-tank/
+
* [https://tanknutdave.com/the-american-hstvl-tank/ <nowiki>[TankNutDave.com]</nowiki> The American HSTV(L) Tank]
  
 
{{TankManufacturer AAI Corporation}}
 
{{TankManufacturer AAI Corporation}}
 
{{USA light tanks}}
 
{{USA light tanks}}

Latest revision as of 02:04, 17 April 2024

Rank VI USA | Premium | Golden Eagles
A-10A Thunderbolt (Early)
HSTV-L
us_hstv_l.png
GarageImage HSTV-L.jpg
ArtImage HSTV-L.jpg
HSTV-L
USA flag.png USA
VII Rank
Battle rating:
AB RB SB
11.7 11.7 11.7
Class:
Research:350 000 Specs-Card-Exp.png
Purchase:950 000 Specs-Card-Lion.png
Show in game

Description

The High Survivability Test Vehicle – Lightweight (HSTV-L) is a light gun system testbed developed in the late 1970s as part of the larger joint U.S. Army and U.S. Marine Corps – Advanced Anti-Armour Vehicle Evaluation (ARMVAL) program, which aimed to explore concepts for future armoured fighting vehicles with a focus on lightweight vehicles. The HSTV-L was created to operationally test the concept of using high speed to enhance a vehicle's survivability rather than heavy armour. It was also used to test a number of new tank technologies, the most notable of which was an automatic main gun - a 75 mm ARES XM274 smoothbore rapid-fire hyper-velocity tank gun. The whole system was nicknamed ELKE (Elevated Kinetic Energy Vehicle). The ARES concept was to fire several high-velocity armour-piercing rounds at an enemy main battle tank (MBT) in a short period of time in order to break through its composite armour. Only one HSTV-L testbed was built and tested until the mid-1980s. Unfortunately, by the time the HSTV-L was tested, the U.S. Army had determined that the ARES cannon would be ineffective against newer Soviet tanks and decided that the 105 mm Royal Ordnance L7 tank gun was the minimum calibre for light gun systems. The Marines were also not confident that the ARES would be effective, particularly in their beach-landing role in breaking through enemies' heavy defences.

Introduced in Update "Starfighters", the HSTV-L offers a unique gameplay experience in top-tier U.S. Army ground forces. The HSTV-L, which has a two-plane fully automatic stabilisation system, laser rangefinder, thermal imaging equipment, and an autoloader that can reload in as little as 1.5 seconds, holds a lot of potential as a hard-hitting flanking vehicle on a heavily contested battlefield. Because of the unusual main gun arrangement, the HSTV-L also provides excellent gun depression if the battlefield is mountainous. However, due to the small calibre of its main gun, it may struggle to engage some MBTs frontally, limiting its overall versatility.

General info

Survivability and armour

Smoke grenades
Creation of a smoke screen in front of the vehicle
Armourfront / side / back
Hull38 / 38 / 19
Turret25 / 25 / 25
Crew3 people
Visibility88 %

The HSTV-L is a very lightly-armoured vehicle. Depending on where you get shot you might lose 1 crew member but you will still be alive. If you get shot on the left side of the vehicle from the front, the chances of your ammo rack detonating greatly increases. Best case scenario for this vehicle is to not get hit in the first place.

Armour Front (Slope angle) Sides Rear Roof
Hull 25.4 mm (80°) Upper Glacis
25.4 mm (55°) Lower Glacis (Upper Part)
25.4 mm (78°) Lower Glacis (Lower Part) 		25.4 mm Upper Sponson Side
19 mm Lower Sponson Side
38.1 mm Lower Hull Side 		25.4 mm 19 mm Engine Compartment
5 mm Radiator Vents
Turret 25.4 mm Turret front
25.4 mm Gun mantlet 		25.4 mm 25.4 mm 25.4 mm
Cupola 25.4 mm
Additional Armour 25.4 mm (80°) Upper Glacis 25.4 mm Frontal Sponson Side (Upper & Lower)
12.7 mm Frontal Sideskirts
8 mm Rear Sideskirts 		N/A

Notes:

  • Lower glacis (both parts) is variable thickness armour.
  • Upper glacis and frontal sponson sides appliqué armour is variable thickness armour.

Mobility

Speedforward / back
AB93 / 28 km/h
RB and SB84 / 25 km/h
Number of gears8 forward
4 back
Weight20.0 t
Engine power
AB1 240 hp
RB and SB650 hp
Power-to-weight ratio
AB62.0 hp/t
RB and SB32.5 hp/t
Game Mode Max Speed (km/h) Weight (tons) Engine power (horsepower) Power-to-weight ratio (hp/ton)
Forward Reverse Stock Upgraded Stock Upgraded
Arcade 93 28 20 1,007 1,240 50.35 62
Realistic 84 25 575 650 28.75 32.5

The HSTV-L has a very good power-to-weight ratio making the vehicle decently fast. The vehicle utilizes a 648 HP gas turbine engine. The HSTV-L is very manoeuvrable due to the gas turbine engine and can get to flanking spots early in the game. However, caution must be taken in regards to the loud engine noise, especially when trying to avoid drawing the attention of enemy players to you.

Modifications and economy

Repair costBasic → Reference
AB3 509 → 5 874 Sl icon.png
RB3 550 → 5 942 Sl icon.png
SB3 741 → 6 262 Sl icon.png
Total cost of modifications277 800 Rp icon.png
454 000 Sl icon.png
Talisman cost3 000 Ge icon.png
Crew training270 000 Sl icon.png
Experts950 000 Sl icon.png
Aces2 200 Ge icon.png
Research Aces1 210 000 Rp icon.png
Reward for battleAB / RB / SB
140 / 160 / 200 % Sl icon.png
244 / 244 / 244 % Rp icon.png
Modifications
Mobility Protection Firepower
Mods new tank traks.png
Tracks
Research:
15 000 Rp icon.png
Cost:
23 000 Sl icon.png
380 Ge icon.png
Mods new tank suspension.png
Suspension
Research:
11 000 Rp icon.png
Cost:
17 000 Sl icon.png
280 Ge icon.png
Mods new tank break.png
Brake System
Research:
11 000 Rp icon.png
Cost:
17 000 Sl icon.png
280 Ge icon.png
Mods new tank filter.png
Filters
Research:
15 000 Rp icon.png
Cost:
23 000 Sl icon.png
380 Ge icon.png
Mods new tank transmission.png
Transmission
Research:
19 000 Rp icon.png
Cost:
29 000 Sl icon.png
480 Ge icon.png
Mods new tank engine.png
Engine
Research:
19 000 Rp icon.png
Cost:
29 000 Sl icon.png
480 Ge icon.png
Mods tank tool kit.png
Improved Parts
Research:
4 500 Rp icon.png
Cost:
23 000 Sl icon.png
380 Ge icon.png
Mods extinguisher.png
Improved FPE
Research:
3 300 Rp icon.png
Cost:
17 000 Sl icon.png
280 Ge icon.png
Mods tank reinforcement us.png
Crew Replenishment
Research:
15 000 Rp icon.png
Cost:
23 000 Sl icon.png
380 Ge icon.png
Mods new tank horizontal aiming.png
Horizontal Drive
Research:
15 000 Rp icon.png
Cost:
23 000 Sl icon.png
380 Ge icon.png
Mods tank ammo.png
75mm_usa_HE_VT_ammo_pack
Research:
15 000 Rp icon.png
Cost:
23 000 Sl icon.png
380 Ge icon.png
Mods tank cannon.png
Adjustment of Fire
Research:
11 000 Rp icon.png
Cost:
17 000 Sl icon.png
280 Ge icon.png
Mods airstrike.png
Airstrike
Research:
11 000 Rp icon.png
Cost:
17 000 Sl icon.png
280 Ge icon.png
Mods scout streak.png
Scout UAV
Research:
11 000 Rp icon.png
Cost:
17 000 Sl icon.png
280 Ge icon.png
Mods new tank vertical aiming.png
Elevation Mechanism
Research:
15 000 Rp icon.png
Cost:
23 000 Sl icon.png
380 Ge icon.png
Mods tank laser rangefinder.png
Laser rangefinder
Research:
15 000 Rp icon.png
Cost:
23 000 Sl icon.png
380 Ge icon.png
Mods smoke screen.png
Smoke grenade
Research:
15 000 Rp icon.png
Cost:
23 000 Sl icon.png
380 Ge icon.png
Mods art support.png
Artillery Support
Research:
19 000 Rp icon.png
Cost:
29 000 Sl icon.png
480 Ge icon.png
Mods scouting.png
Improved optics
Research:
19 000 Rp icon.png
Cost:
29 000 Sl icon.png
480 Ge icon.png
Mods thermal sight.png
NVD
Research:
19 000 Rp icon.png
Cost:
29 000 Sl icon.png
480 Ge icon.png

Unlock order recommendations

The order of modifications should be well thought out. Below is a guide of which modifications to unlock first, but it is just a recommendation and can be modified or adapted depending on the tank commander's preferences.

Tier 1

Tier 1 only has useful modifications but the number one priority should be parts which allows the tank to repair during battle, something that comes in handy in a majority of battles. After that tracks is something that could be researched second as its mobility is more reliant on the tracks upgrade than the firepower is on horizontal drive.

Tier 2

Moving on to tier 2, this tier is harder to pick modifications from because in general they are less useful modifications, but only two are needed before moving to tier 3. FPE and adjustment of fire are the likeliest candidates except in cases where the goal is to use the scouting ability to spawn planes, in which either of the two could be replaced by airstrike. It's best to move on to tier 3 after two tier 2 modifications are researched.

Tier 3

In tier 3 it gets more interesting with a number of useful modifications; three modifications are needed to get to tier 4. All the modifications in this tier are useful so some hard choices have to be made. Due to a decent stock elevation speed the elevation mechanism mod isn't strictly necessary and can be put off until later. Smoke grenades are good for concealing the vehicle to make a hasty escape or try to prevent the enemy from hitting the tank, the laser rangefinder is useful for making accurate shots at range which is also very important as the gun does not have much penetration so well aimed shots are necessary, crew replenishment is useful as always, and filters are beneficial to the mobility. It's recommended to unlock laser rangefinder and smoke grenades and then choose between filters and crew replenishment before then moving on to tier 4.

Tier 4

The most important modifications in tier 4 are NVD to give access to thermal sights for easier spotting of enemies and also the engine modification which greatly increases mobility.

Finishing up

After tier 4 is unlocked and the priority modifications there are unlocked it is time to clean up the remaining modifications. The order of unlocking modifications at this point is less important but there are a few that should be left until last - suspension and brake system which are generally the least important modifications on any given ground vehicle.

Armaments

Laser rangefinder
Reduces the error and increases the maximum measurable distance of the rangefinder
Night vision device
Improves visibility by enhancing natural light or active illumination.
Thermal imager
Allows to see thermal radiation in the infrared range day and night

Main armament

75 mm XM274 cannon
Two-plane stabilizer
Reduces the swing of the gun in two planes while moving
Autoloader
Automatically feeds projectiles into the breech. The speed does not depend on the skills of the loader
Ammunition26 rounds
Reload1.5 s
Vertical guidance-17° / 45°
Main article: XM274 (75 mm)
75 mm XM274 Turret rotation speed (°/s) Reloading rate (seconds)
Mode Capacity Vertical Horizontal Stabilizer Stock Upgraded Full Expert Aced Autoloader
Arcade 26 -17°/+45° ±180° Two-plane 54.3 75.1 91.2 100.9 107.3 1.50
Realistic 33.9 39.9 48.5 53.6 57.0

Ammunition

Penetration statistics
Ammunition Type of
warhead 		Penetration @ 0° Angle of Attack (mm)
10 m 100 m 500 m 1,000 m 1,500 m 2,000 m
XM885 APFSDS 276 269 262 252 243 234
Shell details
Ammunition Type of
warhead 		Velocity
(m/s) 		Projectile
mass (kg) 		Fuse delay Fuse sensitivity
(mm) 		Explosive mass
(TNT equivalent) (g) 		Ricochet
0% 50% 100%
XM885 APFSDS 1,463 2.27 - - - 78° 80° 81°

Ammo racks

Ammo racks of the HSTV-L
Full
ammo 		1st
rack empty 		2nd
rack empty 		Visual
discrepancy
26 7 (+19) 1 (+25) No

Notes:

  • Rack 2 is a ready rack, so although shells deplete from that rack after firing, it will refill from rack 1.

Machine guns

7.62 mm M240 machine gun (coaxial)
Ammunition1 600 rounds
Belt capacity200 rounds
Reload8.0 s
Fire rate941 shots/min
7.62 mm M240 machine gun
Ammunition1 600 rounds
Belt capacity200 rounds
Reload8.0 s
Fire rate941 shots/min
Main article: M240 (7.62 mm)

The HSTV-L has 2 M240 machine guns. One is fixed to the gun mantlet and the other is mounted on the Commander's cupola. These machine guns can be used to mark enemies for your allies and can also be used to shoot down some lighter aircraft, but be careful as shooting them will give away your location and can result in them strafing and destroying your vehicle.

7.62 mm M240
Mount Capacity (Belt) Fire rate Vertical Horizontal
Coaxial 1,600 (200) 941 N/A N/A
Pintle 1,600 (200) 941 -10°/+69° -180°/+20°

Usage in battles

The HSTV-L is a light tank with a quick ready-rack reload, making it adept at dealing with multiple enemies in ambush situations. It can achieve a very good top speed thanks to its light weight and has a similarly good turning ability. With this mobility (which is on par with that of top MBTs), the HSTV-L can achieve desirable early-game positions and move quickly around the map when necessary.

Like most light tanks, this vehicle is lacking in the protection department. It has thin armour in all directions, which is not backed up by any spaced or composite protection, and is susceptible to overpressure damage. In some situations, the armour may be thin enough that kinetic rounds overpenetrate and pass straight through the vehicle without causing much damage. The highly-angled armour can also sometimes bounce shots. In most cases though, the HSTV-L cannot be counted on to sustain heavy fire.

This tank is fairly unique in that it is equipped with an autoloader that can fire every 1.5 seconds, without ever needing to stop to replenish a ready-rack.The shell itself, an APFSDS round, is decent, but may have trouble penetrating the frontal armour of top MBTs. This combined with the vehicle's poor armour means that head-on attacks are rarely advisable, but with the quick reload, multiple shots into an enemy's sides or rear will be very effective.

The HSTV-L is better suited to firing at enemies without their noticing--from ambush positions, from the flanks, and from behind corners. The vehicle's great mobility will aid with this playstyle. Indeed, its mobility is what makes the HSTV-L great on urban maps. Furthermore, in ambush situations the tank is able to easily deal with multiple enemies thanks to its fast ready-rack reload. This tank has a 45 degree gun elevation and a 17 degree gun depression. This gun depression is extremely powerful, and makes the vehicle very effective at hill camping and at firing from behind ridgelines. A thermal sight in both gunner and commander/binocular views makes the HSTV-L a great scouting vehicle. It is recommended to use the vehicle's high mobility to aid in scouting enemies for teammates to locate and destroy.

Pros and cons

Pros:

  • Thanks to the autoloader, the cannon has a very high rate of fire
  • Due to its light armour some kinetic rounds may over penetrate, leaving it undamaged
  • Excellent in urban combat where side shots are much more effective
  • Internal 5 mm armour can help protect crew from spalling
  • Thermal sights for both the gunner and the commander make it a great scouting vehicle especially with its scout UAV, also with thermals
    • Its scout UAV has better thermals than the HSTV-L itself
  • Up to 45° elevation and -30° depression over the sides (-17° depression to the front, -6° depression when facing rear)
  • Very good gun handling
  • Turret has only one crew member, the commander, and the breech is small
  • Excellent mobility, allowing it to keep up with and even outpace MBTs

Cons:

  • Commander's cupola can be penetrated by heavy machine gun fire
  • Limited ammo selection and capacity
  • APFSDS round has low penetration and has problems penetrating frontal armour of some MBTs
  • The XM855 APFSDS dart causes minimal damage to modules or crew members after penetration due to its calibre (reduced spall)
  • Prone to overpressure
  • Does not have access to a heavy machine gun

History

Development

The High Survivability Test Vehicle - Lightweight, shortened to HSTV-L, was a light tank project that was developed in the 1970s and 1980s. It was funded by the Defense Advanced Research Projects Agency (DARPA) and built by the AAI Corporation. The prototype was completed in September 1979 and began field trials soon after. After the field trials the HSTV-L was used for testing of the fire control system (FCS) with different stabilization algorithms tested as well as the hunter-killer sights. The HSTV-L was not chosen for production by the Army or the Marine Corps and was cancelled in 1981. It was later developed into the Rapid Deployment Force Light Tank (RDF/LT).

Design

General

The HSTV-L design was based around an incredibly low profile hull and turret with very shallow angles on the frontal portion, in order to deflect projectiles fired at it. The HSTV-L had a crew of 3, with the driver and gunner side by side in the hull front and the commander in the left side of the turret, all of whom sat semi-reclined. All 3 crew members had the ability to fire the gun and both the gunner and driver's position could drive the vehicle. The vehicle had a length of 8.528 m with gun forward and the hull had a length of 5.918 m. The height was only 2.414 m including the equipment on the turret roof, being 1.994 m to the top of the turret and 1.422 m to the top of the hull. The width was 2.794 m. The vehicle had a combat weight of 14.5 tonnes or up to 17.0 tonnes when equipped with an appliqué armour package. During testing the HSTV-L was fitted with additional equipment for data collection and weighed 20.45 tonnes. The HSTV-L could be airlifted, underslung, by a CH-53 Sea Stallion helicopter when at the weight of 14.5 tonnes.

Mobility and Power

The HSTV-L was propelled by a 650 horsepower (485 kilowatt) Avro-Lycoming gas turbine powerplant and an Allison X-300-4A transmission with four forward and two reverse gears. The transmission had a torque converter. There were five road wheels on each side and the tracks were 450 mm wide. The suspension was built by National Water Lift, being hydropneumatic but not variable; in other words the height could not be adjusted. The ground clearance of the HSTV-L was 0.508 m. The HSTV-L could pivot in place while in neutral gear, and it carried a fuel load of 409 liters giving it a cruising range of 160 km. It could accelerate from 0 to 48 km/h in 11.8 seconds and had a maximum speed of 83.68 km/h.

In addition to the main propulsion system there were two 250 ampere generators providing auxiliary power as well as a 60 gpm hydraulic pump. The hydraulic pump was used to power an oil cooler fan mounted in the engine compartment as well as the gun control system and automatic loading system.

Armament and FCS

The main armament of the HSTV-L was an ARES 75 mm XM274 gun mounted in a rotating turret. 26 rounds of ammunition were provided of both depleted-uranium APFSDS-T and multi-fléchette anti-aircraft rounds. The gun was loaded by an automatic loading system which provided the HSTV-L with a high rate of fire.

Secondary armament was provided by a coaxial 7.62 mm M240 machine gun and a second 7.62 mm M240 machine gun pintle-mounted on the commander's cupola. A total of 3,200 rounds of 7.62 mm ammunition was split between the two machine guns.

The turret could rotate a full 360 degrees at a speed of 57 degrees per second. The gun could elevate 45 degrees but the depression depended on which direction the turret faced; over the front the gun could depress 17 degrees, 30 degrees over the side, and 6 degrees over the rear of the vehicle. Manual backup was provided for turret traverse and gun elevation but the rate at which they moved was much slower when manual than with power. The main gun was two-plane stabilized, with both the stabilization and gun control systems having been produced by Cadillac Gage.

The hunter/killer fire control system (FCS) was designed and built by Texas Instruments. The commander received a stabilized commander's independent thermal viewer (CITV) which could rotate independently of the turret and included both TV and thermal imaging. The gunner also received a stabilized sight, though this one was slaved to the gun, which included thermal and TV imaging as well, along with an eye safe CO2 laser rangefinder built by Raytheon. This hunter/killer system allowed the commander to locate a target with the hunter sight. Once a target was located the gunner would use his killer sight to fire on the target while the commander began to search for the next target. The fire control system (FCS) used the sights, crosswind sensor, muzzle reference system, vertical reference system, and laser rangefinder to automatically determine the firing solution, leaving the gunner only to fire the gun. The fully stabilized main gun along with advanced FCS allowed the HSTV-L a high first hit probability and high accuracy on the move.

The driver and gunner are given a screen that displays the imaging of the hunter sight which allows them to operate independently of a vehicle commander if necessary. Theoretically, the HSTV-L could be controlled entirely by only one crew member from either the driver or gunner's position since both had driving and gunnery controls.

Devblog

By the mid 1970s, the US military initiated a series of studies which looked into the development of new concepts and designs for tanks which combined good firepower and survivability. The latter of which was to be achieved through a smaller size, rather than heavy armour protection.

As at the time, both the US Army and USMC were looking into possible replacements for their M551 Sheridan and M50 Ontos tanks respectively, the two military branches joined forces in a joint research programme dubbed "ARMVAL" (Advanced Antiarmor Vehicle Evaluation). The vehicles developed under this programme would be used as test beds for various new concepts and ideas in an effort to gain new experiences, which would in turn be used in the development of future tank designs.

One of the later products of this experimental programme was the HSTV-L - a compact, lightweight, highly mobile tank design, fitted with an autoloaded 75 mm smoothbore cannon, designed to fire kinetic ammunition in short bursts in order to wear down and ultimately defeat composite armour screens. The HSTV-L was built in 1979 and underwent various trials until 1981.

At the start of the 1980s, the 75 mm gun was considered inadequate to deal with the most recent Soviet MBTs by the Army, while the USMC questioned the vehicle's effectiveness in amphibious landing operations. This led to the ultimate discontinuation of the collaborative project in 1981.

Media

Skins
Images
  • HSTV-L WTWallpaper 01.jpg
  • HSTV-L WTWallpaper 02.jpg
  • HSTV-L WTWallpaper 03.jpg
  • HSTV-L WTWallpaper 04.jpg
  • HSTV-L WTWallpaper 05.jpg
  • HSTV-L WTWallpaper 06.jpg
  • HSTV-L WTWallpaper 07.jpg
Videos
The Shooting Range #293 - Metal Beasts section at 00:28 discusses the HSTV-L.
The Shooting Range #203 - Metal Beasts section at 00:30 discusses the HSTV-L.
HSTV-L - Tank History and Review - Spookston
Best experimental vehicles discusses the HSTV-L at 4:00 - War Thunder Official Channel

See also

Light tanks at similar positions in other tech trees

External links


Aircraft Armaments Incorporated (AAI) Corporation
Light tanks  T92 · HSTV-L

USA light tanks
LVT  LVT(A)(1) · ○LVT(A)(1) · LVT(A)(4)
M2  M2A2 · M2A4 · M2A4 (1st Arm.Div.)
M3/M5 Stuart  M3 Stuart · M3A1 Stuart · M3A1 (USMC) · M5A1 · M5A1 TD · ▃Stuart VI (5th CAD)
M22 Locust  M22
M24 Chaffee  M24 · M24 (TL)
M18 Hellcat  M18 GMC · M18 "Black Cat" · Super Hellcat
M41 Walker Bulldog  M41A1
M551 Sheridan  M551 · M551(76)
M3 Bradley  M3 Bradley · M3A3 Bradley
Wheeled  M8 LAC · T18E2 · M1128 · M1128 Wolfpack
Other  M8A1 GMC · T92 · T114 · HSTV-L · CCVL · XM8 · XM800T · AGS

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