Difference between revisions of "M247"

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{{Specs-Card
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{{Specs-Card|code=us_m247}}
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|code=us_m247
 
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|images={{Specs-Card-Image|GarageImage_{{PAGENAME}}.jpg|ArtImage_{{PAGENAME}}.png}}
 
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}}
 
  
 
== Description ==
 
== Description ==
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<!-- ''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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<!--''In the description, the first part needs to 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 the screenshot of the vehicle. If the novice player does not remember the vehicle by name, they will immediately understand what kind of vehicle it is talking about.''-->
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The '''M247 Sergeant York Division Air Defense (DIVAD)''' was a self-propelled anti-aircraft gun developed by Ford Aerospace in the late 1970s. A new turret with twin 40 mm M266 Bofors autocannons guided by radar has been fitted, using the chassis of the [[M48 Patton (Family)|M48 Patton main battle tank]]. The vehicle bears the name of the well-known World War I soldier, Sergeant Alvin York. Although numerous off-the-shelf technologies were used to facilitate quick and inexpensive development, several technical issues and significant cost overruns led to the project's cancellation in 1985. A total of just 50 units were manufactured.
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[[File:GarageImage_{{PAGENAME}}.jpg|420px|thumb|left]]
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{{Break}}
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Introduced in [[Update 1.81 "The Valkyries"]], the M247 Sergeant York DIVAD is an extremely capable vehicle for the anti-aircraft role. Armed with proximity-fused 40 mm ammunition, this vehicle is capable of shredding any aircraft within a 2.0 km radius. Semi-armour-piercing rounds are also available, but they are only effective against lightly armoured targets. Players can go with teammates while keeping the skies clear, engaging enemy aircraft long before they can drop their bombs on teammates.
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The '''{{Specs|name}}''' is a Rank {{Specs|rank}} American self-propelled anti-aircraft gun {{Battle-rating|1}}. It was introduced in [[Update 1.81 "The Valkyries"]].
  
 
== General info ==
 
== General info ==
 
=== Survivability and armour ===
 
=== Survivability and armour ===
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{{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?''
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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 text within these arrows are not to be deleted -->
 
  
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'''Armour type:'''
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''If necessary use a visual template to indicate the most secure and weak zones of the armour.''-->
 +
'''Armour type:'''  
  
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* Cast homogeneous armour (hull)
+
*Cast homogeneous armour (Hull)  
−
* Rolled homogeneous armour (hull sides - rear bulge, hull roof, turret)
+
*Rolled homogeneous armour (Rear (low), Roof, Turret)
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 32: Line 29:
  
 
* Suspension wheels and tracks are 20 mm thick.
 
* Suspension wheels and tracks are 20 mm thick.
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* Belly armour is 38 mm thick in the front half and 25 mm in the rear.
+
* Belly armour is 38 mm in the front and 25 mm in the rear.
  
 
=== Mobility ===
 
=== Mobility ===
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{{Specs-Tank-Mobility}}
 
 
<!-- ''Write about the mobility of the ground vehicle. Estimate the specific power and manoeuvrability, as well as the maximum speed forwards and backwards.'' -->
 
<!-- ''Write about the mobility of the ground vehicle. Estimate the specific power and manoeuvrability, as well as the maximum speed forwards and backwards.'' -->
  
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{{tankMobility|abMinHp= 1,065|rbMinHp= 663}}
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{{tankMobility|abMinHp= 1065|rbMinHp= 663|<!--AoAweight=(optional) -->}}
  
 
The {{PAGENAME}}'s turret is installed on the hull of an [[M48A1|M48 medium tank]], because of this they have roughly similar mobility. The {{PAGENAME}} is about 3 tons heavier than the M48A1 (49.3 tons vs. 46.4 tons), and has a slightly weaker engine, which translates into a slightly more sluggish machine compared to the M48A1. The M48A1 has a max engine power of 810 hp, while the {{PAGENAME}}'s engine power is 750 hp. For a vehicle this heavy, it has fairly good mobility. When spaded, it can comfortably hit a top speed of 45 km/h on flat terrain, while in cross-country you will have a top speed of around 25 km/h. While going backwards, the top speed is somewhat less impressive: about -9 km/h.
 
The {{PAGENAME}}'s turret is installed on the hull of an [[M48A1|M48 medium tank]], because of this they have roughly similar mobility. The {{PAGENAME}} is about 3 tons heavier than the M48A1 (49.3 tons vs. 46.4 tons), and has a slightly weaker engine, which translates into a slightly more sluggish machine compared to the M48A1. The M48A1 has a max engine power of 810 hp, while the {{PAGENAME}}'s engine power is 750 hp. For a vehicle this heavy, it has fairly good mobility. When spaded, it can comfortably hit a top speed of 45 km/h on flat terrain, while in cross-country you will have a top speed of around 25 km/h. While going backwards, the top speed is somewhat less impressive: about -9 km/h.
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=== Modifications and economy ===
 
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{{Specs-Economy}}
 
  
 
== Armaments ==
 
== Armaments ==
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{{Specs-Tank-Armaments}}
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<!--''Give the reader information about the characteristics of the main gun. Assess its effectiveness in a battle based on the reloading speed, ballistics and the power of shells. Do not forget about the flexibility of the fire, that is how quickly the cannon can be aimed at the target, open fire on it and aim at another enemy. Add a link to the main article on the gun: <code><nowiki>{{main|Name of the weapon}}</nowiki></code>. Describe in general terms the ammunition available for the main gun. Give advice on how to use them and how to fill the ammunition storage.''-->
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=== Main armament ===
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{{main|Bofors L/70 (40 mm)}}
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{{Specs-Tank-Weapon|1}}
 
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<!-- ''Give the reader information about the characteristics of the main gun. Assess its effectiveness in a battle based on the reloading speed, ballistics and the power of shells. Do not forget about the flexibility of the fire, that is how quickly the cannon can be aimed at the target, open fire on it and aim at another enemy. Add a link to the main article on the gun: <code><nowiki>{{main|Name of the weapon}}</nowiki></code>. Describe in general terms the ammunition available for the main gun. Give advice on how to use them and how to fill the ammunition storage.'' The text within these arrows are not to be deleted -->
 
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{{main|M266 (40 mm)}}
 
  
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{| class="wikitable" style="text-align:center" width="100%"
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{| class="wikitable" style="text-align:center"
 +
|-
 +
! colspan="6" | [[Bofors L/70 (40 mm)|40 mm M266 Automatic Cannon]] (x2)
 +
|-
 +
! colspan="3" rowspan="1" style="width:5em" |Capacity (Belt capacity each)
 +
! rowspan="1" | Fire rate <br> (shots/minute)
 +
! rowspan="1" | Vertical <br> guidance
 +
! rowspan="1" | Horizontal <br> guidance
 +
|-
 +
| colspan="3" | 560 (280) || 300 || -5°/+85° || ±180°
 +
|-
 +
! colspan="6" | Turret rotation speed (°/s)
 +
|-
 +
! style="width:4em" |Mode
 +
! style="width:4em" |Stock
 +
! style="width:4em" |Upgraded
 +
! style="width:4em" |Prior + Full crew
 +
! style="width:4em" |Prior + Expert qualif.
 +
! style="width:4em" |Prior + Ace qualif.
 +
|-
 +
| ''Arcade'' || 52.8 || ? || ? || ? || ?
 
|-
 
|-
−
! colspan="6" | [[M266 (40 mm)|40 mm M266 automatic Cannon]] (x2) || colspan="5" | Turret rotation speed (°/s) || colspan="4" | Reloading rate (seconds)
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| ''Realistic'' || 35.7 || ? || ? || ? || ?
 
|-
 
|-
−
! Mode !! Capacity (Belt) !! Fire rate !! Vertical !! Horizontal !! Stabilizer
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! colspan="4" | Reloading rate (seconds)
−
! Stock !! Upgraded !! Full !! Expert !! Aced
 
−
! Stock !! Full !! Expert !! Aced
 
 
|-
 
|-
−
! ''Arcade''
+
! colspan="1" style="width:4em" |Stock
−
| rowspan="2" | 560 (280) || rowspan="2" | 300 || rowspan="2" | -10°/+85° || rowspan="2" | ±180° || rowspan="2" | Two-plane || 79.2 || 109.7 || 133.2 || 147.3 || 156.7 || rowspan="2" | 6.50 || rowspan="2" | 5.75 || rowspan="2" | 5.30 || rowspan="2" | 5.00
+
! colspan="1" style="width:4em" |Prior + Full crew
 +
! colspan="1" style="width:4em" |Prior + Expert qualif.
 +
! colspan="1" style="width:4em" |Prior + Ace qualif.
 
|-
 
|-
−
! ''Realistic''
+
| 6.5 || ? || ? || ?
−
| 53.6 || 63.0 || 76.5 || 84.6 || 90.0
 
 
|-
 
|-
 
|}
 
|}
  
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==== Ammunition ====
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=== Ammunition ===
 +
{| class="wikitable sortable" style="text-align:center" width="100%"
 +
! colspan="8" | Penetration statistics
 +
|-
 +
! rowspan="2" data-sort-type="text" | Ammunition
 +
! rowspan="2" class="unsortable" | Type of <br /> warhead
 +
! colspan="6" | '''Penetration''' '''''in mm''''' '''@ 90°'''
 +
|-
 +
! 10m
 +
! 100m
 +
! 500m
 +
! 1000m
 +
! 1500m
 +
! 2000m
 +
|-
 +
| M811 || HEFI-T* || 5 || 5 || 5 || 5 || 5 || 5
 +
|-
 +
| M822 || HEFI-T* || 5 || 5 || 5 || 5 || 5 || 5
 +
|-
 +
| 40 mm AP-T || AP-T || 93 || 90 || 77 || 62 || 51 || 41
 +
|-
 +
|}
 +
{| class="wikitable sortable" style="text-align:center" width="100%"
 +
! colspan="11" | Shell details
 +
|-
 +
! rowspan="2" data-sort-type="text" | Ammunition
 +
! rowspan="2" class="unsortable" | Type of <br /> warhead
 +
! rowspan="2" |Velocity <br /> in m/s
 +
! rowspan="2" |Projectile<br />Mass in kg
 +
! rowspan="2" | ''Fuse delay''
 +
''in m:''
 +
! rowspan="2" | ''Fuse sensitivity''
 +
''in mm:''
 +
! rowspan="2" | ''Explosive Mass in g<br /> (TNT equivalent):''
 +
! rowspan="2" | ''Normalization At 30° <br> from horizontal:''
 +
! colspan="3" | ''Ricochet:''
 +
|-
 +
! 0%
 +
! 50%
 +
! 100%
 +
|-
 +
| M811 || HEFI-T* || 1100 || 0.87 || 0.2 || 0.1 || 255 || +0° || 79° || 80° || 81°
 +
|-
 +
| M822 || HEFI-T* || 1100 || 0.87 || 0.2 || 0.1 || 185 || +0° || 79° || 80° || 81°
 +
|-
 +
| 40 mm AP-T || AP-T || 1030 || 0.88 || N/A || N/A || N/A || -1° || 48° || 69° || 79°
 +
|-
 +
|}
  
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* '''Default:''' {{Annotation|SAPHEI|Semi armour-piercing high-explosive incendiary}}{{-}}{{Annotation|HEF-I*|High-explosive fragmentation incendiary (self-destroying)}}
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===Belt types===
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{| class="wikitable" style="text-align:center" width="100%"
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* '''M811 Fuze Delay:''' {{Annotation|SAPHEI|Semi armour-piercing high-explosive incendiary}}
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| style="width: 8%" | '''Belts'''
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| style="width: 20%" | '''Shell composition'''
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* '''M811:''' {{Annotation|HEF-I*|High-explosive fragmentation incendiary (self-destroying)}} - Unlike the M822 HE-VT* shells, these require direct hits on aircraft to do significant damage, but if you experience problems with the M822 detonating too early, this belt may be your best choice. This belt does not have tracers, which may make it harder to hit with, but at the same time it will be more difficult for enemy helicopters to detect your shots.
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| '''Combat usage'''
−
 
+
|-
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* '''M822:''' {{Annotation|HE-VT*|High-explosive variable time fuze (self-destroying)}} - Proximity-fused shells that absolutely obliterate aircraft when they make contact, though if they detonate too early, they will do little to no damage. Somewhat unreliable in if they detonate within range of the target, but when they do the target will quickly take considerable damage if not destroyed. The only ammunition for self-propelled anti-aircraft guns that which can cause enough shrapnel damage to bring down planes and helicopters even with near misses. This round should be the go-to anti-air ammunition, although the M811 is a good backup if the M822 is problematic for the gunner.
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| ''Default'' || HEFI-T* / AP-T || align="left" | Good general ammunition, a hit on an aircraft typically means its destruction while still enough to do damage to armoured ground vehicles, especially if it shoots into the side of an enemy tank (weaker armour). Good to start with until comfortable with other types of ammunition.
−
 
 
−
{{:M266 (40 mm)/Ammunition|SAPHEI, HEF-I*, HE-VT*}}
 
−
 
 
−
==== [[Ammo racks]] ====
 
−
[[File:Ammoracks_{{PAGENAME}}.png|right|thumb|x250px|[[Ammo racks]] of the {{PAGENAME}}]]
 
−
<!-- '''Last updated:''' -->
 
−
{| class="wikitable" style="text-align:center"
 
 
|-
 
|-
−
! Full<br>ammo
+
|''40 mm AP-T'' || AP-T / AP-T / AP-T / HEFI-T* || align="left" | Very powerful ammunition which can be used against ground targets with significantly more penetration than other 35-40 mm AP-T projectiles. Will easily destroy any target with side shots even outside the point-blank range and can destroy lighter targets and weak spots from the front even against main battle tanks.
−
! 1st<br>rack empty
 
−
! Visual<br>discrepancy
 
 
|-
 
|-
−
| '''1''' || 0 ''(+1)'' || No
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|''M811'' || HEFI-T* / HEFI-T* / HEFI-T* / AP-T || align="left" | "Poor man's anti-air ammunition." Unlike the M822 shells these require direct hits to do significant damage, but if problems are experienced with M822 detonating too early this belt may be your best choice.
 
|-
 
|-
 +
|''M822'' || HEFI-T* / HEFI-T* / AP-T || align="left" | Proximity-fused shells that absolutely obliterate aircraft when they make contact, though if they detonate too early, they will do little to no damage. Somewhat unreliable in if they detonate within range of the target, but when they do the target will quickly take considerable damage if not destroyed. The only ammunition for self-propelled anti-aircraft guns that which can cause enough shrapnel damage to bring down planes and helicopters even with near misses. This round should be the go-to anti-air ammunition, although the M811 is a good backup if the M822 is problematic for the gunner.
 
|}
 
|}
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'''Notes''':
 
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* With a single ammunition rack, you can bring only 1 type of ammunition in battle.
 
  
 
== Usage in battles ==
 
== Usage in battles ==
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<!-- ''Describe the tactics of playing in the vehicle, the features of using vehicles in the team and advice on tactics. Refrain from creating a "guide" - do not impose a single point of view but instead give the reader food for thought. Describe the most dangerous enemies and give recommendations on fighting them. If necessary, note the specifics of the game in different modes (AB, RB, SB).'' -->
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''Describe the tactics of playing in the vehicle, the features of using vehicles in the team and advice on tactics. Refrain from creating a "guide" - do not impose a single point of view but give the reader food for thought. Describe the most dangerous enemies and give recommendations on fighting them. If necessary, note the specifics of the game in different modes (AB, RB, SB).''
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The M247 ''Sgt. York'' is a very deadly SPAA, The M247 is deadly to some lightly armoured vehicles but even deadlier to Aircraft. When using the  M247 you can easily shred some lightly armoured vehicles like the [[Leopard 1]]. Where the speciality of the M247 is its Proximity fused 40 mm rounds. They will shred any aircraft within a 2.0 km radius. You can play the vehicle mostly in 2 ways. You can push and try defending caps from the enemies and keeping the skies clear, or stay back behind cover and keep the skies clear for your allies while using your AP rounds to fend off enemy vehicles.
 
  
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Generally, enemy tanks should be avoided, your rounds don't have the penetration to deal with all but the lightest of targets. Avoid confrontations if possible and only engage targets that you have a chance of penetrating such as SPAA or light tanks. They can be easily dealt with from the side and the front in some cases. If confrontations become unavoidable pop smoke to try and escape, you cannot deal with anything more armoured than a light tank.
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=== Modules ===
 +
{| class="wikitable"
 +
!Tier
 +
! colspan="2" |Mobility
 +
!Protection
 +
! colspan="3" |Firepower
 +
|-
 +
|I
 +
|Tracks||
 +
|Parts
 +
|Horizontal Drive||M811||
 +
|-
 +
|II
 +
|Suspension||Brake System
 +
|FPE
 +
|Adjustment of Fire||40 mm AP-T||
 +
|-
 +
|III
 +
|Filters||
 +
|Crew Replenishment
 +
|Elevation Mechanism||Smoke grenade||NVD
 +
|-
 +
|IV
 +
|Transmission||Engine
 +
|
 +
|Laser rangefinder||Artillery support||M822
 +
|}
  
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;Ammunition
+
== Pros and cons ==
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<!--''Summarize and briefly evaluate the vehicle in terms of its characteristics and combat effectiveness. Mark its pros and cons in a bulleted list. Try not to use more than 6 points for each of the characteristics. Avoid using categorical definitions such as "bad", "good" and the like - they have a substitution in the form of softer "inadequate", "effective".''-->
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The recommended ammunition belts:
 
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* M822 for Anti-Air
 
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* M811 Fuze Delay for Anti-Tank
 
−
 
 
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M822 is exclusively proximity fuze rounds, making it extremely potent against air threats, not requiring a direct hit to get a kill. Unfortunately, the low penetration of the round makes it unable to perform Anti-Tank duties. If you expect to meet enemy armour switch to the M811 belt, the extra penetration of the rounds allows it to be able to take care of light tanks and SPAA, but struggles against more heavily armoured opponents.
 
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=== Pros and cons ===
 
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<!-- ''Summarise and briefly evaluate the vehicle in terms of its characteristics and combat effectiveness. Mark its pros and cons in a bulleted list. Try not to use more than 6 points for each of the characteristics. Avoid using categorical definitions such as "bad", "good" and the like - use substitutions with softer forms such as "inadequate" and "effective".'' -->
 
  
 
'''Pros:'''
 
'''Pros:'''
  
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* Has access to 12 smoke grenades
+
* Twin stabilized 40 mm M266 cannon (L/70 40 mm Bofors) have a much higher rate of fire compared to the M42 Duster: Deadlier and more accurate
−
* The hull has adequate protection against most light tank calibre rounds
+
* Large ammunition count ensures that you will have plenty to fire throughout a match without fear of running out of ammo mid-game
−
* Can retract and extend both search and tracking radars to reduce the silhouette
+
* Has access to 12 x 66 mm smoke grenades, perfect for exiting a dangerous situation
−
* Twin stabilized 40 mm cannons have a high rate of fire
+
* The M822 ammunition is proximity fused and will detonate if the projectile passes close enough to the target
−
* Large ammunition count ensures that you will have plenty to fire throughout a match
+
* The 40 mm's pose a serious threat to lightly-armoured vehicles
−
* Potent proximity ammunition for anti-aircraft use
+
* Uses the M48 Patton's hull (armour included) = one of the best-protected SPAA in the game
−
* The HE-VT belt has no tracers making it near impossible for enemy aircraft to see and dodge the incoming shells
+
* Benefits in realistic battles from aim-assistance thanks to the radar
−
* Radar allows for a high range of detection and very accurate tracking, with a 10 km tracking and 40 km detection range
+
* Has access to night-vision devices for use in night battles
−
* Has access to night vision devices, a laser rangefinder, commander sights, and commander fire control
+
* Large radar sweep range to easily spot targets, as well as a large radar lock-on marker in its scope
 +
* Can retract and extend both search and tracking radars
  
 
'''Cons:'''
 
'''Cons:'''
  
−
* Weak survivability
+
* As with all high-rank SPAA, the M247 has very thin turret armour; a shell strike could instantly end the vehicle
−
** Vulnerable to enemy armour, artillery strikes and air attacks
+
** Turret is also vulnerable to strafing aircraft + rockets
−
** The turret armour is only 5 mm thick, which is easy to penetrate even for rifle-calibre MGs
+
*Armour advantages of the hull are nullified due to the inclusion of the Hull Break mechanic of the turret
−
** Only three crew members
+
*No thermal sight
−
* Radar is tall and can expose your position  
+
*With all radar SPAA, the spinning search radar can expose your position and lead to your destruction
−
* The M247 is sluggish especially when stock, and will usually not be able to keep up with MBTs
+
*The gunner sight optics only has one zoom (12.0x with a sight FOV of 6) meaning that you may struggle to engage tanks and to lock/eliminate aircraft
−
* The high rate of fire can deplete the ammo quickly without proper trigger discipline
 
−
** 5-minute long restock time on a capture point after depleting ammo
 
−
* Completely lacks any armour-piercing rounds in any belt, giving it very poor defensive capabilities against ground vehicles, even lightly-armoured ones 
 
−
* The gunner sight optics only has one zoom setting (12.0x with a sight FOV of 6) meaning that you may struggle to engage tanks and lock/eliminate aircraft
 
−
* No IRST mode and cannot lock onto targets when the radar is off
 
  
 
== History ==
 
== History ==
 
<!--''Describe the history of the creation and combat usage of the ground vehicle in more detail than in the introduction. If the historical reference turns out to be too big, take it to a separate article, taking a link to an article about the vehicle and adding a block "/ History" (example: <nowiki>https://wiki.warthunder.com/(Vehicle-name)/History</nowiki>) and add a link to it here using the <code>main</code> template. Be sure to reference text and sources by using <code><nowiki><ref></nowiki></code>, as well as adding them at the end of the article.''-->
 
<!--''Describe the history of the creation and combat usage of the ground vehicle in more detail than in the introduction. If the historical reference turns out to be too big, take it to a separate article, taking a link to an article about the vehicle and adding a block "/ History" (example: <nowiki>https://wiki.warthunder.com/(Vehicle-name)/History</nowiki>) and add a link to it here using the <code>main</code> template. Be sure to reference text and sources by using <code><nowiki><ref></nowiki></code>, as well as adding them at the end of the article.''-->
  
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The M247 "Sergeant York" was designed in the late 1970's as a purpose-built SPAAG. It was designed to fight alongside the [[M1 Abrams]] and [[M3 Bradley|M2/M3 Bradley]], in order to provide cover against aircraft. There were other SPAA vehicles in service at the time; these were the [[M163|M163 Vulcan]] and the MIM-72/M48 Chaparral. The former being a 20 mm rotary cannon mounted on an armoured personnel carrier, and the latter being a heavily modified armoured personnel carrier chassis with a surface-to-air missile launcher. Neither of those two vehicles were designed as SPAA's, and so, did not have the necessary performance to be adequate at their job. The M247 was designed as a replacement for both of the previous vehicles.
+
The M247 "Sergeant York" was designed in the late 1970's as a purpose-built SPAAG. It was designed to fight alongside the [[M1 Abrams]] and [[M3 Bradley|M2/M3 Bradley]], in order to provide cover against aircraft. There were other SPAA vehicles in service at the time; these were the [[M163|M163 Vulcan]] and the MIM-72/M48 Chaparral. The former being a 20 mm rotary cannon mounted on an armored personnel carrier, and the latter being a heavily modified armored personnel carrier chassis with a surface-to-air missile launcher. Neither of those two vehicles were designed as SPAA's, and so, did not have the necessary performance to be adequate at their job. The M247 was designed as a replacement for both of the previous vehicles.
  
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Designs from a multitude of companies were entered into the competition. Only two were selected for testing: the Ford XM-247 with twin Bofors 40 mm cannons and the General Dynamics XM-246 with twin Oerlikon 35 mm cannons. The two prototypes were tested, and the XM-247 was selected as the winner, although the XM-246 had outscored it in all the shooting tests. The M247, as it was soon designated, ran into many problems. The radar was extremely deficient; it had a hard time distinguishing trees from planes, and if the guns were pointed too high, they would get in the radar's way and confuse it even more. In addition, it took too long for the radar to pick up a target and for the guns to actually take aim. In addition, the turret traverse speed was much too slow, the vehicle it's self was too sluggish to keep up the M1s and M2s, and it was unreliable in cold weather. Eventually, the program was cancelled after more testing, where it was proven the system could not even shoot down stationary drones. There was still a need for an anti-aircraft vehicle that could keep up with modern vehicles, so Oerlikon Canada created the [[ADATS (M113)|ADATS]] anti-aircraft missile system. This was not as successful as hoped, and was only accepted into Canadian service. The void was eventually filled by the M6 Linebacker, an M2 Bradley with Stinger missiles instead of TOW missiles. The Linebacker was capable of keeping up with modern armoured forces, which was the reason for its acceptance, even though the Stingers were not as effective as the ADATS missiles<ref>https://en.wikipedia.org/wiki/M247_Sergeant_York</ref>.
+
Designs from a multitude of companies were entered into the competition. Only two were selected for testing: the Ford XM-247 with twin Bofors 40mm cannons and the General Dynamics XM-246 with twin Oerlikon 35mm cannons. The two prototypes were tested, and the XM-247 was selected as the winner, although the XM-246 had outscored it in all the shooting tests. The M247, as it was soon designated, ran into many problems. The radar was extremely deficient; it had a hard time distinguishing trees from planes, and if the guns were pointed too high, they would get in the radar's way and confuse it even more. In addition, it took too long for the radar to pick up a target and for the guns to actually take aim. In addition, the turret traverse speed was much too slow, the vehicle it's self was too sluggish to keep up the M1's and M2's, and it was unreliable in cold weather. Eventually, the program was cancelled after more testing, where it was proven the system could not even shoot down stationary drones. There was still a need for an anti-aircraft vehicle that could keep up with modern vehicles, so Oerlikon Canada created the [[ADATS]] anti-aircraft missile system. This was not as successful as hoped, and was only accepted into Canadian service. The void was eventually filled by the M6 Linebacker, an M2 Bradley with Stinger missiles instead of TOW missiles. The Linebacker was capable of keeping up with modern armored forces, which was the reason for its acceptance, even though the Stingers were not as effective as the ADATS missiles<ref>https://en.wikipedia.org/wiki/M247_Sergeant_York</ref>.
  
 
== Media ==
 
== Media ==
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<!-- ''Excellent additions to the article would be video guides, screenshots from the game, and photos.'' -->
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<!--''An excellent addition to the article will be video guides, as well as screenshots from the game and photos.''-->
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[https://live.warthunder.com/feed/camouflages/?q=#m247 '''Skins''' and '''camouflages''' for the M247 Sergeant York from live.warthunder.com.]
  
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;Skins
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== See also ==
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<!--''Links to the articles on the War Thunder Wiki that you think will be useful for the reader, for example:''
  
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* [https://live.warthunder.com/feed/camouflages/?vehicle=us_m247 Skins and camouflages for the {{PAGENAME}} from live.warthunder.com.]
 
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== See also ==
 
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<!-- ''Links to the articles on the War Thunder Wiki that you think will be useful for the reader, for example:''
 
 
* ''reference to the series of the vehicles;''
 
* ''reference to the series of the vehicles;''
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* ''links to approximate analogues of other nations and research trees.'' -->
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* ''links to approximate analogues of other nations and research trees.''-->
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;Vehicles equipped with the same chassis
 
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* [[M48 Patton (Family)]]
 
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;Other vehicles of similar configuration and role
 
  
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* [[AMX-30 DCA]]
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* [[M48A1|M48A1 Patton]]
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* [[VEAK 40]]
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* [[M42|M42 Duster]]
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* [[M163|M163 Vulcan]]
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* [[ADATS]]
  
 
== External links ==
 
== External links ==
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<!-- ''Paste links to sources and external resources, such as:''
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<!--''Paste links to sources and external resources, such as:''
 
* ''topic on the official game forum;''
 
* ''topic on the official game forum;''
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* ''other literature.'' -->
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* ''encyclopedia page on tank;''
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* ''other literature.''-->
  
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* [[wt:en/news/5714-development-tam-and-m247-sergeant-york-en|[Devblog] TAM and M247 Sergeant York]]
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* [[wt:en/news/5714-development-tam-and-m247-sergeant-york-en|[Devblog<nowiki>]</nowiki> TAM and M247 Sergeant York]]
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* [[wikipedia:M247_Sergeant_York|[Wikipedia] M247 Sergeant York]]
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* "[https://en.wikipedia.org/wiki/M247_Sergeant_York|M247 Sergeant York]", ''Wikipedia.org'', Accessed on 24 March 2020.
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* [https://www.militaryfactory.com/armor/detail.asp?armor_id=644 <nowiki>[Military Factory]</nowiki> M247 Sergeant York]
 
  
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=== References ===
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{{USA anti-aircraft vehicles}}
 
<references />
 
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{{TankManufacturer Ford}}
 
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{{USA anti-aircraft vehicles}}
 

Revision as of 09:04, 28 July 2020

Rank VI USSR | Premium | Golden Eagles
Su-25K Pack
M247
us_m247.png
M247
USA flag.png USA
VI Rank
Battle rating:
AB RB SB
9.0 9.0 9.0
Class:
Research:190 000 Specs-Card-Exp.png
Purchase:520 000 Specs-Card-Lion.png
Show in game

Description

GarageImage M247.jpg


The Gun, Air Defence Artillery, Self-Propelled, 40-mm, M247 is a Rank VI American self-propelled anti-aircraft gun with a battle rating of 9.0 (AB/RB/SB). It was introduced in Update 1.81 "The Valkyries".

General info

Survivability and armour

Armour type:

  • Cast homogeneous armour (Hull)
  • Rolled homogeneous armour (Rear (low), Roof, Turret)
Armour Front (Slope angle) Sides Rear Roof
Hull 85-200 mm (59-74°) Front glacis
63-200 mm (13-60°) Lower glacis 		76 mm (8-43°) Front
51 mm (0-43°) Rear 		35 mm (26-32°) Top
25 mm (61-62°) Bottom 		57 mm
Turret 25.4 mm (15-76°) Turret front (Upper)
12.7 mm (40-69°) Turret front (Lower)
25.4 mm (0-87°) Gun mantlet 		12.7-25.4 mm (0-19°) Upper
12.7 mm (40-69°) Lower 		12.7 mm (18°) 12.7 mm

Notes:

  • Suspension wheels and tracks are 20 mm thick.
  • Belly armour is 38 mm in the front and 25 mm in the rear.

Mobility

Game Mode Max Speed (km/h) Weight (tons) Engine power (horsepower) Power-to-weight ratio (hp/ton)
Forward Reverse Stock Upgraded Stock Upgraded
Arcade 53 9 49.4 1065 1,431 21.56 28.97
Realistic 49 8 663 750 13.42 15.18

The M247's turret is installed on the hull of an M48 medium tank, because of this they have roughly similar mobility. The M247 is about 3 tons heavier than the M48A1 (49.3 tons vs. 46.4 tons), and has a slightly weaker engine, which translates into a slightly more sluggish machine compared to the M48A1. The M48A1 has a max engine power of 810 hp, while the M247's engine power is 750 hp. For a vehicle this heavy, it has fairly good mobility. When spaded, it can comfortably hit a top speed of 45 km/h on flat terrain, while in cross-country you will have a top speed of around 25 km/h. While going backwards, the top speed is somewhat less impressive: about -9 km/h.

Armaments

Main article: Bofors L/70 (40 mm)
40 mm M266 Automatic Cannon (x2)
Capacity (Belt capacity each) Fire rate
(shots/minute) 		Vertical
guidance 		Horizontal
guidance
560 (280) 300 -5°/+85° ±180°
Turret rotation speed (°/s)
Mode Stock Upgraded Prior + Full crew Prior + Expert qualif. Prior + Ace qualif.
Arcade 52.8  ?  ?  ?  ?
Realistic 35.7  ?  ?  ?  ?
Reloading rate (seconds)
Stock Prior + Full crew Prior + Expert qualif. Prior + Ace qualif.
6.5  ?  ?  ?

Ammunition

Penetration statistics
Ammunition Type of
warhead 		Penetration in mm @ 90°
10m 100m 500m 1000m 1500m 2000m
M811 HEFI-T* 5 5 5 5 5 5
M822 HEFI-T* 5 5 5 5 5 5
40 mm AP-T AP-T 93 90 77 62 51 41
Shell details
Ammunition Type of
warhead 		Velocity
in m/s 		Projectile
Mass in kg 		Fuse delay

in m:

Fuse sensitivity

in mm:

Explosive Mass in g
(TNT equivalent): 		Normalization At 30°
from horizontal: 		Ricochet:
0% 50% 100%
M811 HEFI-T* 1100 0.87 0.2 0.1 255 +0° 79° 80° 81°
M822 HEFI-T* 1100 0.87 0.2 0.1 185 +0° 79° 80° 81°
40 mm AP-T AP-T 1030 0.88 N/A N/A N/A -1° 48° 69° 79°

Belt types

Belts Shell composition Combat usage
Default HEFI-T* / AP-T Good general ammunition, a hit on an aircraft typically means its destruction while still enough to do damage to armoured ground vehicles, especially if it shoots into the side of an enemy tank (weaker armour). Good to start with until comfortable with other types of ammunition.
40 mm AP-T AP-T / AP-T / AP-T / HEFI-T* Very powerful ammunition which can be used against ground targets with significantly more penetration than other 35-40 mm AP-T projectiles. Will easily destroy any target with side shots even outside the point-blank range and can destroy lighter targets and weak spots from the front even against main battle tanks.
M811 HEFI-T* / HEFI-T* / HEFI-T* / AP-T "Poor man's anti-air ammunition." Unlike the M822 shells these require direct hits to do significant damage, but if problems are experienced with M822 detonating too early this belt may be your best choice.
M822 HEFI-T* / HEFI-T* / AP-T Proximity-fused shells that absolutely obliterate aircraft when they make contact, though if they detonate too early, they will do little to no damage. Somewhat unreliable in if they detonate within range of the target, but when they do the target will quickly take considerable damage if not destroyed. The only ammunition for self-propelled anti-aircraft guns that which can cause enough shrapnel damage to bring down planes and helicopters even with near misses. This round should be the go-to anti-air ammunition, although the M811 is a good backup if the M822 is problematic for the gunner.

Usage in battles

Describe the tactics of playing in the vehicle, the features of using vehicles in the team and advice on tactics. Refrain from creating a "guide" - do not impose a single point of view but give the reader food for thought. Describe the most dangerous enemies and give recommendations on fighting them. If necessary, note the specifics of the game in different modes (AB, RB, SB).

Modules

Tier Mobility Protection Firepower
I Tracks Parts Horizontal Drive M811
II Suspension Brake System FPE Adjustment of Fire 40 mm AP-T
III Filters Crew Replenishment Elevation Mechanism Smoke grenade NVD
IV Transmission Engine Laser rangefinder Artillery support M822

Pros and cons

Pros:

  • Twin stabilized 40 mm M266 cannon (L/70 40 mm Bofors) have a much higher rate of fire compared to the M42 Duster: Deadlier and more accurate
  • Large ammunition count ensures that you will have plenty to fire throughout a match without fear of running out of ammo mid-game
  • Has access to 12 x 66 mm smoke grenades, perfect for exiting a dangerous situation
  • The M822 ammunition is proximity fused and will detonate if the projectile passes close enough to the target
  • The 40 mm's pose a serious threat to lightly-armoured vehicles
  • Uses the M48 Patton's hull (armour included) = one of the best-protected SPAA in the game
  • Benefits in realistic battles from aim-assistance thanks to the radar
  • Has access to night-vision devices for use in night battles
  • Large radar sweep range to easily spot targets, as well as a large radar lock-on marker in its scope
  • Can retract and extend both search and tracking radars

Cons:

  • As with all high-rank SPAA, the M247 has very thin turret armour; a shell strike could instantly end the vehicle
    • Turret is also vulnerable to strafing aircraft + rockets
  • Armour advantages of the hull are nullified due to the inclusion of the Hull Break mechanic of the turret
  • No thermal sight
  • With all radar SPAA, the spinning search radar can expose your position and lead to your destruction
  • The gunner sight optics only has one zoom (12.0x with a sight FOV of 6) meaning that you may struggle to engage tanks and to lock/eliminate aircraft

History

The M247 "Sergeant York" was designed in the late 1970's as a purpose-built SPAAG. It was designed to fight alongside the M1 Abrams and M2/M3 Bradley, in order to provide cover against aircraft. There were other SPAA vehicles in service at the time; these were the M163 Vulcan and the MIM-72/M48 Chaparral. The former being a 20 mm rotary cannon mounted on an armored personnel carrier, and the latter being a heavily modified armored personnel carrier chassis with a surface-to-air missile launcher. Neither of those two vehicles were designed as SPAA's, and so, did not have the necessary performance to be adequate at their job. The M247 was designed as a replacement for both of the previous vehicles.

Designs from a multitude of companies were entered into the competition. Only two were selected for testing: the Ford XM-247 with twin Bofors 40mm cannons and the General Dynamics XM-246 with twin Oerlikon 35mm cannons. The two prototypes were tested, and the XM-247 was selected as the winner, although the XM-246 had outscored it in all the shooting tests. The M247, as it was soon designated, ran into many problems. The radar was extremely deficient; it had a hard time distinguishing trees from planes, and if the guns were pointed too high, they would get in the radar's way and confuse it even more. In addition, it took too long for the radar to pick up a target and for the guns to actually take aim. In addition, the turret traverse speed was much too slow, the vehicle it's self was too sluggish to keep up the M1's and M2's, and it was unreliable in cold weather. Eventually, the program was cancelled after more testing, where it was proven the system could not even shoot down stationary drones. There was still a need for an anti-aircraft vehicle that could keep up with modern vehicles, so Oerlikon Canada created the ADATS anti-aircraft missile system. This was not as successful as hoped, and was only accepted into Canadian service. The void was eventually filled by the M6 Linebacker, an M2 Bradley with Stinger missiles instead of TOW missiles. The Linebacker was capable of keeping up with modern armored forces, which was the reason for its acceptance, even though the Stingers were not as effective as the ADATS missiles[1].

Media

Skins and camouflages for the M247 Sergeant York from live.warthunder.com.

See also

External links


USA anti-aircraft vehicles
M3 Half-track derivatives  M13 MGMC · M15 CGMC · M16 MGMC
M24 derivative  M19A1
M41 derivative  M42
Radar SPAAG  M163 · M247
Missile SPAA  Imp.Chaparral · LAV-AD · XM975

  1. ↑ https://en.wikipedia.org/wiki/M247_Sergeant_York
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