Difference between revisions of "MGB-61"

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If necessary, use a graphic template to show the most well-protected or most vulnerable points in the armor.''-->
 
If necessary, use a graphic template to show the most well-protected or most vulnerable points in the armor.''-->
−
MGB-61 has no armour, so a few hits from ships with cannons will destroy it. However, small boats such as motor torpedo boats will have a tough time trying to destroy MGB-61 due to its powerful guns. The MGB-61 has a crew of 12.
+
 
 +
MGB-61 has the following armour layout:
 +
 
 +
* [[2pdr Rolls Royce (40 mm)|2pdr Rolls Royce]] gunshield: 12.7 mm hardened armour
 +
* Hull: 40 mm, wood
 +
* Superstructure: 15 mm, wood
 +
 
 +
[[File:MGB-61_internals.png|thumb|MGB-61 internals (starboard side). Note the ammo storages below the bridge and in front of the rear gun.]]
 +
 
 +
Any gun in the game will easily be able to penetrate anywhere on the boat, including the gunshield, at practically any range.
 +
 
 +
MGB-61 can be hull-broken by any gun with a diameter greater than 4 inches (102 mm). Hull-break triggers when a capable gun destroys any hull compartment or the bridge, resulting in instant destruction of the rest of the boat. At MGB-61's battle rating, the only gun capable of hull-breaking her is the [[8cwt QF Mk I (114 mm)|8cwt QF Mk I]], found on {{Specs-Link|uk_dark_class}}. The ability to be hull-broken by guns larger than 4 inches is a trait that applies to the vast majority of boats in tier 1 and 2, so in that respect, MGB-61 isn't better or worse than most other boats.
 +
 
 +
MGB-61's hull is split into three compartments. The first compartment starts at the bow and ends just in front of the bridge. The second starts at the bridge and ends in front of the engines. The third starts at the engines and ends at the stern. Overall, with a crew complement of 12, survivability is average.
 +
 
 +
MGB-61 has 4 ammunition storages, one below each of the two [[Vickers Mk.V (12.7 mm)]] mounts and two in front of the rear [[2pdr Rolls Royce (40 mm)]] mount. Destroying these will also destroy the rest of the boat. In practice, though, this almost never happens, since they are relatively small targets and because most guns at this battle rating are either machine guns or low-calibre autocannons which require many hits to destroy ammo storages. It's often both quicker and easier to target the hull compartments and knock out the crew.
  
 
=== Mobility ===
 
=== Mobility ===
−
''Write about the ship’s mobility. Evaluate its power and maneuverability, rudder rerouting speed, stopping speed at full tilt, with its maximum forward speed and reverse speed.''
+
<!--''Write about the ship’s mobility. Evaluate its power and maneuverability, rudder rerouting speed, stopping speed at full tilt, with its maximum forward speed and reverse speed.''-->
 +
 
 +
{| class="wikitable" style="text-align:center"
 +
! colspan="6" | '''Mobility Characteristics'''
 +
|-
 +
! rowspan="2" | Game Mode
 +
! rowspan="2" | Upgrade Status
 +
! colspan="2" | Maximum Speed (km/h)
 +
! rowspan="2" | {{Annotation|Turn Time (s)|Time needed to complete a 360° turn at maximum speed}}
 +
! rowspan="2" | {{Annotation|Turn Radius (m)|At maximum speed}}
 +
|-
 +
! rowspan="1" | Forward
 +
! rowspan="1" | Reverse
 +
|-
 +
| rowspan="2" | {{Annotation|AB|Arcade Battles}}
 +
| {{Annotation|Stock|All modifications removed}} || 73 || 20 || ~23.20 || ~42.05
 +
|-
 +
| {{Annotation|Upgraded|All modifications installed}} || 100 || 27 || ~15.41 || ~26.57
 +
|-
 +
| rowspan="2" | {{Annotation|RB|Realistic Battles}}/{{Annotation|SB|Simulator Battles}}
 +
| {{Annotation|Stock|All modifications removed}} || 64 || 17 || ~25.64 || ~47.61
 +
|-
 +
| {{Annotation|Upgraded|All modifications installed}} || 74 || 20 || ~21.18 || ~38.39
 +
|-
 +
|}
 +
 
 +
When moving forwards at high speeds, the bow will lift out of the water. This creates a blind spot directly in front of the boat where the twin 12.7 mm Vickers Mk.V mounts can't depress far enough to engage surface targets.
 +
 
 +
MGB-61 has a displacement of 34 tons.
  
 
== Armament ==
 
== Armament ==
 
=== Primary armament ===
 
=== Primary armament ===
−
<!--''Provide information about the characteristics of the primary armament. Evaluate their efficacy in battle based on their reload speed, ballistics and the capacity of their shells. Add a link to the main article about the weapon: <nowiki>{{main|Weapon name}}</nowiki>.
+
{{main|Vickers Mk.V (12.7 mm)}}
 +
<!--''Provide information about the characteristics of the primary armament. Evaluate their efficacy in battle based on their reload speed, ballistics and the capacity of their shells.
  
 
Broadly describe the ammunition available for the primary armament, and provide recommendations on how to use it and which ammunition to choose.''-->
 
Broadly describe the ammunition available for the primary armament, and provide recommendations on how to use it and which ammunition to choose.''-->
−
The MGB-61 has two turrets at the front, both with 2 x [[Vickers Mk.V (12.7 mm)|12.7 mm Vickers MK.V machine guns]]. Both turrets can turn 360 degrees.
+
 
 +
In her primary armament group, MGB-61 has four 12.7 mm Vickers Mk.V guns in two twin mounts, mounted on either side of the bridge. Each mount as 4,000 rounds of ammunition available, 2,000 rounds per gun, for a total of 8,000 rounds. Each mount can traverse horizontally at a rate of 75°/s and vertically at a rate of 75°/s. Each gun has a belt capacity of 200 rounds with a stated rate of fire of 600 rounds/min, though in actuality, for both mounts, the gun on the gunner's left side fires faster, at around 685 rounds/min, firing all 200 of its rounds in the time it takes the right-side gun to fire about 175 rounds. With a stock crew, the guns can be reloaded in 13 seconds; with an aced crew, they can be reloaded in 10 seconds. Their maximum range against surface targets is roughly 2 km.
 +
 
 +
{| class="wikitable" style="text-align:center"
 +
! colspan="2" | '''Guidance for the Secondary Gun Turret'''
 +
|-
 +
! Horizontal !! Vertical
 +
|-
 +
| ±180° || -10°/+70°
 +
|-
 +
|}
 +
 
 +
There are three choices of ammunition available:
 +
 
 +
* Universal: {{Annotation|T|Tracer}}/{{Annotation|AP|Armour-piercing}}/{{Annotation|I|Incendiary}}
 +
 
 +
* 12.7 mm I: {{Annotation|T|Tracer}}/{{Annotation|I|Incendiary}}/{{Annotation|I|Incendiary}}/{{Annotation|I|Incendiary}}/{{Annotation|I|Incendiary}}
 +
 
 +
* 12.7 mm API: {{Annotation|T|Tracer}}/{{Annotation|AP|Armour-piercing}}/{{Annotation|I|Incendiary}}/{{Annotation|AP|Armour-piercing}}
 +
 
 +
{| class="wikitable sortable" style="text-align:center" width="100%"
 +
! colspan="7" | '''Penetration Statistics'''
 +
|-
 +
! rowspan="2" data-sort-type="text" | Ammunition
 +
! colspan="6" | '''Penetration @ 0° Angle of Attack (mm)'''
 +
|-
 +
! 10 m !! 100 m !! 500 m !! 1,000 m !! 1,500 m !! 2,000 m
 +
|-
 +
| Universal || 27 || 26 || 23 || 20 || 18 || 16
 +
|-
 +
| 12.7 mm I || 22 || 21 || 18 || 16 || 14 || 12
 +
|-
 +
| 12.7 mm API || 27 || 26 || 23 || 20 || 18 || 16
 +
|-
 +
|}
  
 
=== Secondary armament ===
 
=== Secondary armament ===
 +
{{main|2pdr Rolls Royce (40 mm)}}
 
<!--''Some ships are fitted with weapons of various calibers. Secondary armament is defined by the weapon chosen with the control <code>Select secondary weapon</code>. Evaluate the secondary armament and give advice on how to use them. Describe the ammunition available for the secondary armament. Provide recommendations on how to use them and which ammunition to choose. Remember that anti-air armament, even heavy caliber weapons, belong in the next section.''-->
 
<!--''Some ships are fitted with weapons of various calibers. Secondary armament is defined by the weapon chosen with the control <code>Select secondary weapon</code>. Evaluate the secondary armament and give advice on how to use them. Describe the ammunition available for the secondary armament. Provide recommendations on how to use them and which ammunition to choose. Remember that anti-air armament, even heavy caliber weapons, belong in the next section.''-->
−
The MGB-61 has a powerful 40 mm 2pdr Rolls Royce semi-automatic cannon as secondary armament, capable of destroying any boat or ship at the MGB's battle rating. The 40 mm 2pdr has high rate of fire, but it does not have a full 360 degrees of rotation.
+
 
 +
In her secondary armament group, MGB-61 has one 40 mm 2pdr Rolls Royce semi-automatic cannon in a single mount, mounted centerline on the stern. It has 1,200 rounds of ammunition available. The mount can traverse horizontally at a rate of 45°/s and vertically at a rate of 55°/s. The gun has a magazine capacity of 4 rounds and has a rate of fire of 231 rounds/min. With a stock crew, it can be reloaded in 1.7 seconds; with an aced crew, it can be reloaded in 0.85 seconds. Its maximum range against surface targets is roughly 3 km.
 +
 
 +
{| class="wikitable" style="text-align:center"
 +
! colspan="2" | '''Guidance for the Secondary Gun Turret'''
 +
|-
 +
! Horizontal !! Vertical
 +
|-
 +
| ±151° || -12°/+60°
 +
|-
 +
|}
 +
 
 +
There are three choices of ammunition available:
 +
 
 +
* Universal: {{Annotation|HEF|High-explosive fragmentation}}/{{Annotation|AP-T|Armour-piercing tracer}}/{{Annotation|HEF|High-explosive fragmentation}}/{{Annotation|AP-T|Armour-piercing tracer}}
 +
 
 +
* 40 mm HE: {{Annotation|HEF|High-explosive fragmentation}}/{{Annotation|HEF|High-explosive fragmentation}}/{{Annotation|HEF|High-explosive fragmentation}}/{{Annotation|AP-T|Armour-piercing tracer}}
 +
 
 +
* 40 mm AP: {{Annotation|AP-T|Armour-piercing tracer}}/{{Annotation|AP-T|Armour-piercing tracer}}/{{Annotation|AP-T|Armour-piercing tracer}}/{{Annotation|HEF|High-explosive fragmentation}}
 +
 
 +
{| class="wikitable sortable" style="text-align:center" width="100%"
 +
! colspan="7" | '''Penetration Statistics'''
 +
|-
 +
! rowspan="2" data-sort-type="text" | Ammunition
 +
! colspan="6" | '''Penetration @ 0° Angle of Attack (mm)'''
 +
|-
 +
! 10 m !! 100 m !! 500 m !! 1,000 m !! 1,500 m !! 2,000 m
 +
|-
 +
| Universal || 60 || 57 || 50 || 43 || 38 || 34
 +
|-
 +
| 40 mm HE || 60 || 57 || 50 || 43 || 38 || 34
 +
|-
 +
| 40 mm AP || 60 || 57 || 50 || 43 || 38 || 34
 +
|-
 +
|}
  
 
=== Special armament ===
 
=== Special armament ===
 +
{{main|Mk.VII depth charge}}
 
<!--''Depth charges, mines, rocket launchers and missiles are also effective in skilled hands and can be an unexpected surprise for an opponent. Evaluate the ammunition of this type of armament and rate its performance in combat.''-->
 
<!--''Depth charges, mines, rocket launchers and missiles are also effective in skilled hands and can be an unexpected surprise for an opponent. Evaluate the ammunition of this type of armament and rate its performance in combat.''-->
−
2 x [[Mk.VII depth charge]]
+
 
 +
[[File:MGB-61_DC_order.png|thumb|Mk.VII depth charges numbered 1-2 according to their drop order (click to expand).]]
 +
 
 +
MGB-61 can carry two Mk.VII depth charges mounted amidships, one on each side facing outwards. The depth charges are dropped one at a time and drop in this order (see the image):
 +
 
 +
# Starboard side
 +
# Portside
 +
 
 +
Before spawning, the detonation time delay can be set anywhere between 3 seconds and 10 seconds.
 +
 
 +
{| class="wikitable" style="text-align:center"
 +
! colspan="4" | '''Depth Charge Characteristics'''
 +
|-
 +
! Mass (kg)
 +
! Explosive Type
 +
! Explosive Mass (kg)
 +
! TNT Equivalent (kg)
 +
|-
 +
| 196 || TNT || 130 || 130
 +
|}
  
 
== Usage in battles ==
 
== Usage in battles ==
 
<!--''Describe the technique of using this ship, the characteristics of her use in a team and tips on strategy. Abstain from writing an entire guide – don’t get try to provide a single point of view, but give the reader food for thought. Talk about the most dangerous opponents for this vehicle and provide recommendations on fighting them. If necessary, note the specifics of playing with this vehicle in various modes (AB, RB, SB).''-->
 
<!--''Describe the technique of using this ship, the characteristics of her use in a team and tips on strategy. Abstain from writing an entire guide – don’t get try to provide a single point of view, but give the reader food for thought. Talk about the most dangerous opponents for this vehicle and provide recommendations on fighting them. If necessary, note the specifics of playing with this vehicle in various modes (AB, RB, SB).''-->
−
MGB-61 capable of destroying all small boats and most ships that it faces due to its strong firepower. The highly accurate 12.7 mm machine guns should be used to take out fast MTBs.. The 40 mm 2pdr cannon should be used to engage larger boats due to it's rapid firing rate. A few good shots should do the job. Unfortunately, because its traverse range is limited, gun handling can be tricky.  
+
 
 +
MGB-61's primary armament consists of four 12.7 mm Vickers Mk.V machineguns in two twin mounts. With all four on target, they have a very good damage output, roughly comparable to the damage output of a twin 20 mm cannon mount. However, when moving at high speeds, the bow of the boat will lift out of the water by quite a bit. This creates a blind spot in front of the boat for several hundred meters where one or both of the Vickers Mk.V mounts won't be able to depress their guns far enough to get shots on target. When on the move, either keep the enemy at an angle in front of the boat or keep them directly behind the boat where there's no.
 +
 
 +
The 12.7 mm Vickers Mk.V gun has a rather large belt capacity of 200 round, and, with a rate of fire of either 600 or 685 rounds per minute, it can fire for 20 or 17.5 seconds. Compared to her cannon-armed counterparts, MGB-61 can sustain fire for much longer, though this comes at the cost of a very long reload, between 13 and 10 seconds depending on the crew level. Running out of ammunition mid-engagement is almost always a death sentence due to the long reload. Because of this, always fire off any remaining ammunition after engagements if there are less than 300 or so rounds of ammunition between the four guns.
 +
 
 +
MGB-61's secondary gun, a 40 mm Rolls Royce cannon, hits harder than the 12.7 mm machine guns. It's particularly useful against larger boats with its powerful HE rounds and is practically a necessity against certain armoured targets, since the machine guns can only penetrate a maximum of 22 mm of armour; with an AP rounds capable of penetrating 60 mm of armour, it is more than enough to deal with any armoured targets MGB-61 might face. The 40 mm cannon is also useful for shooting at enemies outside of the machine guns' maximum range, roughly 2 km. All that said, the 40 mm cannon actually has a lower damage output against most targets than the four machine guns because of its lower rate of fire and because it has a ~1 second reload every four rounds. The gun also can't rotate a full 360°, making it less versatile than the machine guns. Outside of the cases mentioned above, the machine guns will generally do much better. Still, the 40 mm can be switched to in a pinch if really needed, for example, if the machine guns are reloading.
 +
 
 +
The 12.7 mm Vickers Mk.V mounts can fire in all directions except in a ~117° arc towards the opposite mount. There's also a blind spot for ~275 m directly behind the boat where both guns can't fire. When on the move, the rear blind spot is virtually eliminated, though a new blind spot in front of the boat is created. Overall, firing arcs are poor. The rear 40 mm Rolls Royce mount, on the other hand, has very good firing arcs, able to fire in all directions except for a ~62° arc centred towards the front of the boat.
 +
 
 +
;Ammunition Choices
 +
 
 +
For the 12.7 mm Vickers Mk.V, the 12.7 mm I belt is slightly better against both aircraft and surface targets compared to the 12.7 mm API belt. Though the AP rounds penetrate 5 mm more armour at point-blank than the I rounds, with such a small difference, the AP rounds won't be able to penetrate any armour that the I rounds can't. That said, the damage output difference between the I and API belt is so little that it's largely down to preference which to use.
 +
 
 +
For the 40 mm 2pdr Rolls Royce cannon, the best ammunition choice is the 40 mm HE because it has the highest ratio of HE rounds to AP rounds, meaning that it will be the most effective against both aircraft and surface targets. The 40 mm HE belt should be the main ammunition choice, but a few of the 40 mm AP belt should also be taken into battle for use against armoured targets. The AP belt is also useful against enemies heading directly bow-in. In this situation, HE rounds will only damage the bow compartment and, if that compartment is already destroyed, will deal only minimal damage. AP rounds can pass through the bow compartment and deal damage to the rest of the vessel.
 +
 
 +
;Depth Charges
 +
 
 +
Being anti-submarine weapons and with the present lack of submarines in the game, there is practically no reason to use them. While they can be used against surface targets, this is extremely situational. Sailing up right next to a slower target and dropping a depth charge can lead to some success, though again, this is very situational. If attempting this, remember the order in which the depth charges drop and that there is no reason to use any depth charge activation time setting above the minimum 3 seconds, since higher delay times means the depth charge will sink further, and thus away, from the target. Again, it should be reiterated that this is very situational.
 +
 
 +
There is no practical reason to take them into battle, especially since, if they're not dropped, they essentially become unarmoured ammo racks.
 +
 
 +
=== Modules ===
 +
{| class="wikitable"
 +
! Tier
 +
! colspan="1" | Seakeeping
 +
! colspan="2" | Unsinkability
 +
! colspan="3" | Firepower
 +
|-
 +
| I
 +
| Dry-Docking
 +
| Tool Set
 +
|
 +
| 40 mm HE
 +
| 12.7 mm I
 +
|
 +
|-
 +
| II
 +
| Rudder Replacement
 +
| Fire Protection System
 +
| Smokescreen
 +
| 40 mm AP
 +
| 12.7 mm API
 +
| Auxiliary Armament Targeting
 +
|-
 +
| III
 +
| Propeller Replacement
 +
|
 +
|
 +
| Improved Rangefinder
 +
| Depth Charges
 +
| Primary Armament Targeting
 +
|-
 +
| IV
 +
| Engine Maintenance
 +
| New Pumps
 +
|
 +
| Artillery Support
 +
|
 +
|
 +
|-
 +
|}
  
 
=== Pros and cons ===
 
=== Pros and cons ===
 
<!--''Summarize and briefly evaluate the vehicle in terms of its characteristics and combat effectiveness. Mark its pros and cons in the 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".''-->
 
<!--''Summarize and briefly evaluate the vehicle in terms of its characteristics and combat effectiveness. Mark its pros and cons in the 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".''-->
 +
 
'''Pros:'''
 
'''Pros:'''
  
−
* Powerful armament
+
* 12.7 mm Vickers Mk.V: high rate of fire, large belt capacity, good damage output, can rotate 360°
−
* Main armament turrets are able to turn 360 degrees
+
* 40 mm 2pdr Rolls Royce: very quick reload, high penetration with AP rounds, good firing arcs
−
* Semi-auto cannon at the stern provides good flank and rear firepower
+
* Good mobility
  
 
'''Cons:'''
 
'''Cons:'''
  
−
* No armour
+
* Blind spot directly in front when moving at high speeds
−
* Not as fast as other small boats
+
* 12.7 mm Vickers Mk.V: long reload, poor firing arcs
−
* 2pdr cannon has average accuracy
+
* 40 mm 2pdr Rolls Royce: cannot fire directly forwards, small magazine capacity, cannot rotate 360°
−
* 2pdr has slow traverse speed
 
  
 
== History ==
 
== History ==
−
''Describe the history of the creation and combat usage of the ship 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 ship 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.''-->
 +
 
 +
Over the course of the Second World War, British Power Boat Company (BPB), based at Hythe, manufactured three motor anti-submarine boat (MASB) designs which were essentially three differently sized versions of the same overall design, as follows: a 60-foot version, consisting of MASBs 1-5; a 63-foot version, consisting of MASBs 22-45; and a 70-foot version, consisting of MASBs 6-21, 46, and 50-67). These boats were originally designed as motor torpedo boats (MTBs), but with the increasing threat of German U-Boats, those ordered by the Royal Navy were ordered as MASBs, their torpedo tubes replaced with depth charge racks and ASDIC equipment.
 +
 
 +
The 70-foot boats, in particular, had a standard displacement of around 30 tons, with a full displacement of up to 38 tons, depending on the boat. They had a length of 70 feet (21.3 m), a beam of 16 feet 7 inches (5.05 m), and a draught of around 3 feet (~1 m) depending on the boat. The boats were powered as follows:
 +
 
 +
* MASBs 6-21: ordered by the Royal Navy as MASBs, all completed throughout 1940 and 1941. These were originally planned to be powered by Rolls Royce petrol engines. However, these engines became reserved only for Hurricane and Spitfire fighter aircraft by the time the boats were built. Instead, they were powered by two weaker Napier Sea Lion petrol engines driving two shafts and could only achieve 23 knots. In 1942, they received stronger Packard petrol engines and could achieve 38 knots.
 +
* MASB 46: ordered by the Royal Netherlands Navy as an MTB. With the capitulation of the Netherlands in May 1940 before her completion, she was requisitioned by the Royal Navy in July 1940 and completed as a MASB on 13th July 1941. MASB 46 was powered by three Rolls Royce petrol engines driving three shafts and could achieve 42.5 knots.
 +
* MASBs 50-67: ordered by the French Navy as MTBs. With the capitulation of France in June 1940 before the completion of most of the boats, they were requisitioned by the Royal Navy in July 1940 and completed as a MASB throughout 1940 and 1941. MASBs 50-67 were powered by three Isotta-Fraschini engines driving three shafts and could achieve 40 knots.
 +
 
 +
Around 1941, to counter the more heavily armed German E-Boats, the Royal Navy converted most of their MASBs, including all of the BPB 70-foot MASBs, into motor gun boats (MGBs). During this time, the BPB 70-foot boats were redesignated MGBs 6-21, 46, and 50-67 and were refitted with a standardized armament consisting of 2-pdr aft gun and two twin .50 calibre machine gun mounts on either side of the bridge.
 +
 
 +
MASB-61 was one of the ex-French BPB 70-foot boats. She was completed on 12th April 1941, but with the capitulation of France, she was requisitioned by the Royal Navy in July 1940 and converted into an MASB. In January 1941, she was refitted as a motor gun boat and redesignated as MGB-61. MGB-61 was commanded by the following:
 +
 
 +
* Lt. P.N. Howes, RN: December 1940 to August 1941
 +
* Lt. I.R. Griffiths, RN: August 1941 to December 1941
 +
* T/Lt. D.P. James, RNVR: December 1941 to July 1942
 +
* T/Lt. J. Collins, RNVR: July 1942 to August 1943
 +
 
 +
MGB-61 served as part of the 6th MGB Flotilla with HMS Beehive at Felixstowe from 1941 to 1943. She was disposed of in February 1945.
  
 
== Media ==
 
== Media ==
−
''An excellent addition to the article will be video guides, as well as screenshots from the game and photos.''
+
<!--''An excellent addition to the article will be video guides, as well as screenshots from the game and photos.''-->
 +
 
 +
<div class="portale" align="center">
 +
{| class="catlist" frame="box" style="background: #efefef;" align="center"
 +
|<span style="white-space:nowrap;">[[File:GEN_LIVE_WT_1_HPL.jpg|510px|link=https://live.warthunder.com/feed/camouflages/?vehicleCountry=britain&vehicleType=ship&vehicleClass=gun_boat&vehicle=uk_70ft_mgb|]]</span> ||
 +
|-
 +
|}
 +
</div>
  
 
== See also ==
 
== See also ==
−
''Links to the articles on the War Thunder Wiki that you think will be useful for the reader, for example:''
+
<!--''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 ship;''
 
* ''reference to the series of the ship;''
−
* ''links to approximate analogues of other nations and research trees.''
+
* ''links to approximate analogues of other nations and research trees.''-->
 +
 
 +
* {{Specs-Link|uk_fairmile_a_ml100}}
 +
* {{Specs-Link|uk_71ft_mgb}}
 +
* {{Specs-Link|uk_dark_class}}
  
 
== 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 ship;''
 
* ''encyclopedia page on ship;''
−
* ''other literature.''
+
* ''other literature.''-->
 +
 
 +
* [http://cfv.org.uk/research/boat/database Coastal Forces Veterans - Boat Database]
 +
* [https://www.unithistories.com/units_british/RN_CoastalForces.html#MGB%20Boats unithistories.com - Royal Navy Coastal Forces 1940-1945]
 +
* [http://www.naval-history.net/WW2BritishLosses3Coastal.htm naval-history.net - British vessels lost at sea in World War 2 - MGB, MTB, SGB, ML, etc] - originally published in ''British Vessels Lost at Sea, 1935-45'', His Majesty's Stationary Office, 1947
 +
* [http://www.navypedia.org/ships/uk/brit_c_f_mgb6.htm NAVYPEDIA - MGB6 motor gun boats (35, 1939 - 1941)]
 +
* [https://uboat.net/allies/warships/class.html?ID=671&navy=HMS uboat.net - BPB 70 feet-type (ex: French) class]
 +
* [https://d-dayrevisited.co.uk/projects/masb-27-restoration/ D-Day Revisited - MASB 27 Restoration]
 +
* [https://www.yalumba.co.uk/Framesets/British%20Power%20Boat%20Co%20-%20Page%204,%20MGBs.html yalumba.co.uk - British Power Boat Co Page 4]
 +
* [http://www.coastal-forces.org.uk/boats.html Coastal Forces Heritage Trust - Boats]
 +
 
 +
==References==
 +
 
 +
===Bibliography===
 +
 
 +
* Konstam, Angus (2010). ''British Motor Gun Boat 1939–45''. Osprey Publishing Ltd. ISBN 978-1-84908-077-4.
  
 
{{Britain boats}}
 
{{Britain boats}}

Revision as of 16:23, 13 July 2020

VTOL | Rank 5 USA
AV-8A Harrier Pack
MGB-61
uk_70ft_mgb.png
MGB-61
Britain flag.png Britain
I Rank
Battle rating:
AB RB SB
1.7 1.7 1.7
Class:
Research:5 900 Specs-Card-Exp.png
Purchase:6 300 Specs-Card-Lion.png
Show in game

Description

GarageImage MGB-61.jpg


The 70 ft MGB-61 is a rank I British motor gun boat with a battle rating of 1.7 (AB/RB/SB). It was introduced in during the Closed Beta Test for Ground Forces before Update 1.41. It was introduced in Update 1.83 "Masters of the Sea" as part of the British fleet closed beta test.

General info

Survivability and armour

MGB-61 has the following armour layout:

  • 2pdr Rolls Royce gunshield: 12.7 mm hardened armour
  • Hull: 40 mm, wood
  • Superstructure: 15 mm, wood
MGB-61 internals (starboard side). Note the ammo storages below the bridge and in front of the rear gun.

Any gun in the game will easily be able to penetrate anywhere on the boat, including the gunshield, at practically any range.

MGB-61 can be hull-broken by any gun with a diameter greater than 4 inches (102 mm). Hull-break triggers when a capable gun destroys any hull compartment or the bridge, resulting in instant destruction of the rest of the boat. At MGB-61's battle rating, the only gun capable of hull-breaking her is the 8cwt QF Mk I, found on Dark Adventurer. The ability to be hull-broken by guns larger than 4 inches is a trait that applies to the vast majority of boats in tier 1 and 2, so in that respect, MGB-61 isn't better or worse than most other boats.

MGB-61's hull is split into three compartments. The first compartment starts at the bow and ends just in front of the bridge. The second starts at the bridge and ends in front of the engines. The third starts at the engines and ends at the stern. Overall, with a crew complement of 12, survivability is average.

MGB-61 has 4 ammunition storages, one below each of the two Vickers Mk.V (12.7 mm) mounts and two in front of the rear 2pdr Rolls Royce (40 mm) mount. Destroying these will also destroy the rest of the boat. In practice, though, this almost never happens, since they are relatively small targets and because most guns at this battle rating are either machine guns or low-calibre autocannons which require many hits to destroy ammo storages. It's often both quicker and easier to target the hull compartments and knock out the crew.

Mobility

Mobility Characteristics
Game Mode Upgrade Status Maximum Speed (km/h) Turn Time (s) Turn Radius (m)
Forward Reverse
AB Stock 73 20 ~23.20 ~42.05
Upgraded 100 27 ~15.41 ~26.57
RB/SB Stock 64 17 ~25.64 ~47.61
Upgraded 74 20 ~21.18 ~38.39

When moving forwards at high speeds, the bow will lift out of the water. This creates a blind spot directly in front of the boat where the twin 12.7 mm Vickers Mk.V mounts can't depress far enough to engage surface targets.

MGB-61 has a displacement of 34 tons.

Armament

Primary armament

Main article: Vickers Mk.V (12.7 mm)

In her primary armament group, MGB-61 has four 12.7 mm Vickers Mk.V guns in two twin mounts, mounted on either side of the bridge. Each mount as 4,000 rounds of ammunition available, 2,000 rounds per gun, for a total of 8,000 rounds. Each mount can traverse horizontally at a rate of 75°/s and vertically at a rate of 75°/s. Each gun has a belt capacity of 200 rounds with a stated rate of fire of 600 rounds/min, though in actuality, for both mounts, the gun on the gunner's left side fires faster, at around 685 rounds/min, firing all 200 of its rounds in the time it takes the right-side gun to fire about 175 rounds. With a stock crew, the guns can be reloaded in 13 seconds; with an aced crew, they can be reloaded in 10 seconds. Their maximum range against surface targets is roughly 2 km.

Guidance for the Secondary Gun Turret
Horizontal Vertical
±180° -10°/+70°

There are three choices of ammunition available:

  • Universal: T/AP/I
  • 12.7 mm I: T/I/I/I/I
  • 12.7 mm API: T/AP/I/AP
Penetration Statistics
Ammunition Penetration @ 0° Angle of Attack (mm)
10 m 100 m 500 m 1,000 m 1,500 m 2,000 m
Universal 27 26 23 20 18 16
12.7 mm I 22 21 18 16 14 12
12.7 mm API 27 26 23 20 18 16

Secondary armament

Main article: 2pdr Rolls Royce (40 mm)

In her secondary armament group, MGB-61 has one 40 mm 2pdr Rolls Royce semi-automatic cannon in a single mount, mounted centerline on the stern. It has 1,200 rounds of ammunition available. The mount can traverse horizontally at a rate of 45°/s and vertically at a rate of 55°/s. The gun has a magazine capacity of 4 rounds and has a rate of fire of 231 rounds/min. With a stock crew, it can be reloaded in 1.7 seconds; with an aced crew, it can be reloaded in 0.85 seconds. Its maximum range against surface targets is roughly 3 km.

Guidance for the Secondary Gun Turret
Horizontal Vertical
±151° -12°/+60°

There are three choices of ammunition available:

  • Universal: HEF/AP-T/HEF/AP-T
  • 40 mm HE: HEF/HEF/HEF/AP-T
  • 40 mm AP: AP-T/AP-T/AP-T/HEF
Penetration Statistics
Ammunition Penetration @ 0° Angle of Attack (mm)
10 m 100 m 500 m 1,000 m 1,500 m 2,000 m
Universal 60 57 50 43 38 34
40 mm HE 60 57 50 43 38 34
40 mm AP 60 57 50 43 38 34

Special armament

Main article: Mk.VII depth charge
Mk.VII depth charges numbered 1-2 according to their drop order (click to expand).

MGB-61 can carry two Mk.VII depth charges mounted amidships, one on each side facing outwards. The depth charges are dropped one at a time and drop in this order (see the image):

  1. Starboard side
  2. Portside

Before spawning, the detonation time delay can be set anywhere between 3 seconds and 10 seconds.

Depth Charge Characteristics
Mass (kg) Explosive Type Explosive Mass (kg) TNT Equivalent (kg)
196 TNT 130 130

Usage in battles

MGB-61's primary armament consists of four 12.7 mm Vickers Mk.V machineguns in two twin mounts. With all four on target, they have a very good damage output, roughly comparable to the damage output of a twin 20 mm cannon mount. However, when moving at high speeds, the bow of the boat will lift out of the water by quite a bit. This creates a blind spot in front of the boat for several hundred meters where one or both of the Vickers Mk.V mounts won't be able to depress their guns far enough to get shots on target. When on the move, either keep the enemy at an angle in front of the boat or keep them directly behind the boat where there's no.

The 12.7 mm Vickers Mk.V gun has a rather large belt capacity of 200 round, and, with a rate of fire of either 600 or 685 rounds per minute, it can fire for 20 or 17.5 seconds. Compared to her cannon-armed counterparts, MGB-61 can sustain fire for much longer, though this comes at the cost of a very long reload, between 13 and 10 seconds depending on the crew level. Running out of ammunition mid-engagement is almost always a death sentence due to the long reload. Because of this, always fire off any remaining ammunition after engagements if there are less than 300 or so rounds of ammunition between the four guns.

MGB-61's secondary gun, a 40 mm Rolls Royce cannon, hits harder than the 12.7 mm machine guns. It's particularly useful against larger boats with its powerful HE rounds and is practically a necessity against certain armoured targets, since the machine guns can only penetrate a maximum of 22 mm of armour; with an AP rounds capable of penetrating 60 mm of armour, it is more than enough to deal with any armoured targets MGB-61 might face. The 40 mm cannon is also useful for shooting at enemies outside of the machine guns' maximum range, roughly 2 km. All that said, the 40 mm cannon actually has a lower damage output against most targets than the four machine guns because of its lower rate of fire and because it has a ~1 second reload every four rounds. The gun also can't rotate a full 360°, making it less versatile than the machine guns. Outside of the cases mentioned above, the machine guns will generally do much better. Still, the 40 mm can be switched to in a pinch if really needed, for example, if the machine guns are reloading.

The 12.7 mm Vickers Mk.V mounts can fire in all directions except in a ~117° arc towards the opposite mount. There's also a blind spot for ~275 m directly behind the boat where both guns can't fire. When on the move, the rear blind spot is virtually eliminated, though a new blind spot in front of the boat is created. Overall, firing arcs are poor. The rear 40 mm Rolls Royce mount, on the other hand, has very good firing arcs, able to fire in all directions except for a ~62° arc centred towards the front of the boat.

Ammunition Choices

For the 12.7 mm Vickers Mk.V, the 12.7 mm I belt is slightly better against both aircraft and surface targets compared to the 12.7 mm API belt. Though the AP rounds penetrate 5 mm more armour at point-blank than the I rounds, with such a small difference, the AP rounds won't be able to penetrate any armour that the I rounds can't. That said, the damage output difference between the I and API belt is so little that it's largely down to preference which to use.

For the 40 mm 2pdr Rolls Royce cannon, the best ammunition choice is the 40 mm HE because it has the highest ratio of HE rounds to AP rounds, meaning that it will be the most effective against both aircraft and surface targets. The 40 mm HE belt should be the main ammunition choice, but a few of the 40 mm AP belt should also be taken into battle for use against armoured targets. The AP belt is also useful against enemies heading directly bow-in. In this situation, HE rounds will only damage the bow compartment and, if that compartment is already destroyed, will deal only minimal damage. AP rounds can pass through the bow compartment and deal damage to the rest of the vessel.

Depth Charges

Being anti-submarine weapons and with the present lack of submarines in the game, there is practically no reason to use them. While they can be used against surface targets, this is extremely situational. Sailing up right next to a slower target and dropping a depth charge can lead to some success, though again, this is very situational. If attempting this, remember the order in which the depth charges drop and that there is no reason to use any depth charge activation time setting above the minimum 3 seconds, since higher delay times means the depth charge will sink further, and thus away, from the target. Again, it should be reiterated that this is very situational.

There is no practical reason to take them into battle, especially since, if they're not dropped, they essentially become unarmoured ammo racks.

Modules

Tier Seakeeping Unsinkability Firepower
I Dry-Docking Tool Set 40 mm HE 12.7 mm I
II Rudder Replacement Fire Protection System Smokescreen 40 mm AP 12.7 mm API Auxiliary Armament Targeting
III Propeller Replacement Improved Rangefinder Depth Charges Primary Armament Targeting
IV Engine Maintenance New Pumps Artillery Support

Pros and cons

Pros:

  • 12.7 mm Vickers Mk.V: high rate of fire, large belt capacity, good damage output, can rotate 360°
  • 40 mm 2pdr Rolls Royce: very quick reload, high penetration with AP rounds, good firing arcs
  • Good mobility

Cons:

  • Blind spot directly in front when moving at high speeds
  • 12.7 mm Vickers Mk.V: long reload, poor firing arcs
  • 40 mm 2pdr Rolls Royce: cannot fire directly forwards, small magazine capacity, cannot rotate 360°

History

Over the course of the Second World War, British Power Boat Company (BPB), based at Hythe, manufactured three motor anti-submarine boat (MASB) designs which were essentially three differently sized versions of the same overall design, as follows: a 60-foot version, consisting of MASBs 1-5; a 63-foot version, consisting of MASBs 22-45; and a 70-foot version, consisting of MASBs 6-21, 46, and 50-67). These boats were originally designed as motor torpedo boats (MTBs), but with the increasing threat of German U-Boats, those ordered by the Royal Navy were ordered as MASBs, their torpedo tubes replaced with depth charge racks and ASDIC equipment.

The 70-foot boats, in particular, had a standard displacement of around 30 tons, with a full displacement of up to 38 tons, depending on the boat. They had a length of 70 feet (21.3 m), a beam of 16 feet 7 inches (5.05 m), and a draught of around 3 feet (~1 m) depending on the boat. The boats were powered as follows:

  • MASBs 6-21: ordered by the Royal Navy as MASBs, all completed throughout 1940 and 1941. These were originally planned to be powered by Rolls Royce petrol engines. However, these engines became reserved only for Hurricane and Spitfire fighter aircraft by the time the boats were built. Instead, they were powered by two weaker Napier Sea Lion petrol engines driving two shafts and could only achieve 23 knots. In 1942, they received stronger Packard petrol engines and could achieve 38 knots.
  • MASB 46: ordered by the Royal Netherlands Navy as an MTB. With the capitulation of the Netherlands in May 1940 before her completion, she was requisitioned by the Royal Navy in July 1940 and completed as a MASB on 13th July 1941. MASB 46 was powered by three Rolls Royce petrol engines driving three shafts and could achieve 42.5 knots.
  • MASBs 50-67: ordered by the French Navy as MTBs. With the capitulation of France in June 1940 before the completion of most of the boats, they were requisitioned by the Royal Navy in July 1940 and completed as a MASB throughout 1940 and 1941. MASBs 50-67 were powered by three Isotta-Fraschini engines driving three shafts and could achieve 40 knots.

Around 1941, to counter the more heavily armed German E-Boats, the Royal Navy converted most of their MASBs, including all of the BPB 70-foot MASBs, into motor gun boats (MGBs). During this time, the BPB 70-foot boats were redesignated MGBs 6-21, 46, and 50-67 and were refitted with a standardized armament consisting of 2-pdr aft gun and two twin .50 calibre machine gun mounts on either side of the bridge.

MASB-61 was one of the ex-French BPB 70-foot boats. She was completed on 12th April 1941, but with the capitulation of France, she was requisitioned by the Royal Navy in July 1940 and converted into an MASB. In January 1941, she was refitted as a motor gun boat and redesignated as MGB-61. MGB-61 was commanded by the following:

  • Lt. P.N. Howes, RN: December 1940 to August 1941
  • Lt. I.R. Griffiths, RN: August 1941 to December 1941
  • T/Lt. D.P. James, RNVR: December 1941 to July 1942
  • T/Lt. J. Collins, RNVR: July 1942 to August 1943

MGB-61 served as part of the 6th MGB Flotilla with HMS Beehive at Felixstowe from 1941 to 1943. She was disposed of in February 1945.

Media

GEN LIVE WT 1 HPL.jpg

See also

External links

References

Bibliography

  • Konstam, Angus (2010). British Motor Gun Boat 1939–45. Osprey Publishing Ltd. ISBN 978-1-84908-077-4.


Britain boats
Motor torpedo boats  Brave Borderer · Dark Aggressor · Dark Aggressor TD · Fairmile D (617) · Fairmile D (697) · Fairmile D (5001) · HMS Gay Archer
  MTB-1(1) · MTB-1(2) · MTB Vosper · MTB Vosper(2) · MTB-422
Motor gun boats  Dark Adventurer · Fairmile A (ML100) · Fairmile B (ML345) · Fairmile C (312) · Fairmile C (332) · Fairmile D (601) · Fairmile H LCS(L)(2)
  HMAS Arrow · MGB-61 · MGB-75 · ML 1383 · SGB Grey Fox · SGB Grey Goose
Gunboats  HMS Spey

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