MGB-61

From War Thunder Wiki
Revision as of 23:24, 14 March 2021 by mistermanman (talk | contribs)

(diff) ← Older revision | Approved revision (diff) | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search
Rank 4 USA
USS Helena Pack
uk_70ft_mgb.png
GarageImage MGB-61.jpg
MGB-61
AB RB SB
1.7 1.7 1.7
Research:5 900 Specs-Card-Exp.png
Purchase:6 300 Specs-Card-Lion.png
Show in game

Description

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 Update 1.83 "Masters of the Sea" as part of the British fleet closed beta test. With the split of the naval tech trees in Update "New Power", MGB-61 was moved to the coastal fleet tech tree.

General info

Survivability and armour

Armourfront / side / back
Hull40 mm (wood)
Superstructure15 mm (wood)
Number of section3
Displacement34 t
Crew12 people
MGB-61 internals (starboard). Note the ammo storages below the bridge and in front of the rear gun.

MGB-61 has the following armour layout:

While the gun shield may stop low-calibre machine guns, heavy machine guns and cannons will have no trouble with them at any range. The hull and superstructure will not stop any sort of gunfire.

The hull is split into three compartments. The first compartment starts at the bow and ends in front of the bridge; the second ends between the fuel tanks and the engines; the third ends at the stern. MGB-61 can be hull-broken by any round with a large enough diameter and explosive mass. In general, this is limited to HE rounds greater with a diameter greater than or equal to 4 inches (102 mm) with an explosive mass greater than 1.5 kg. At MGB-61's battle rating, there is no gun capable of hull-breaking her.

There are two ammunition storages: the first, holding the ammunition for the primary armament, is located just above the waterline in front of the aft 40 mm 2pdr Rolls Royce cannon; the other ammunition storage, holding the ammunition for the secondary armament, is located just above the waterline directly underneath each of the two twin 12.7 mm Vickers Mk.V machine gun mounts. Destroying either will instantly destroy the boat.

MGB-61 has a crew complement of 12. With a stock crew, it is knocked out when 7 crew are lost; with an aced crew, this is increased to 8. Overall, the survivability is average.

Mobility

Speedforward / back
AB99 / 27 km/h
RB74 / 20 km/h
Mobility Characteristics
Game Mode Upgrade Status Maximum Speed (km/h) Turn Time (s) Turn Radius (m)
Forward Reverse
AB Stock 73 20 ~23.21 ~42.07
Upgraded 99 27 ~15.41 ~26.57
RB/SB Stock 64 17 ~25.64 ~47.61
Upgraded 74 20 ~21.18 ~38.39

MGB-61 has a displacement of 34 tons.

When moving forwards at high speeds, the bow will lift out of the water. This creates a blind spot at close ranges in front of the boat where, depending on the angle, one or both of the twin 12.7 mm Vickers Mk.V mounts are unable to depress far enough to get the guns on target.

Modifications and economy

Repair costBasic → Reference
AB610 → 769 Sl icon.png
RB640 → 807 Sl icon.png
Total cost of modifications5 920 Rp icon.png
4 500 Sl icon.png
Talisman cost410 Ge icon.png
Crew training1 800 Sl icon.png
Experts6 300 Sl icon.png
Aces80 Ge icon.png
Research Aces140 000 Rp icon.png
Reward for battleAB / RB / SB
20 / 30 / 100 % Sl icon.png
106 / 106 / 106 % Rp icon.png
Modifications
Seakeeping Unsinkability Firepower
Mods new ship hull.png
Dry-Docking
Research:
300 Rp icon.png
Cost:
230 Sl icon.png
70 Ge icon.png
Mods new ship rudder.png
Rudder Replacement
Research:
220 Rp icon.png
Cost:
170 Sl icon.png
50 Ge icon.png
Mods new ship screw.png
Propeller Replacement
Research:
370 Rp icon.png
Cost:
280 Sl icon.png
80 Ge icon.png
Mods new ship engine.png
Engine Maintenance
Research:
640 Rp icon.png
Cost:
480 Sl icon.png
150 Ge icon.png
Mods ship tool kit.png
Tool Set
Research:
300 Rp icon.png
Cost:
230 Sl icon.png
70 Ge icon.png
Mods manual ship extinguisher.png
Fire Protection System
Research:
220 Rp icon.png
Cost:
170 Sl icon.png
50 Ge icon.png
Mods engine smoke screen system.png
Smokescreen
Research:
220 Rp icon.png
Cost:
170 Sl icon.png
50 Ge icon.png
Mods new ship pumps.png
New Pumps
Research:
640 Rp icon.png
Cost:
480 Sl icon.png
150 Ge icon.png
Mods ammo.png
40mm_qf_mkxv_he_ammo_pack
Research:
300 Rp icon.png
Cost:
230 Sl icon.png
70 Ge icon.png
Mods ammo.png
12.7 mm I
Research:
300 Rp icon.png
Cost:
230 Sl icon.png
70 Ge icon.png
Mods ammo.png
40mm_qf_mkxv_ap_ammo_pack
Research:
220 Rp icon.png
Cost:
170 Sl icon.png
50 Ge icon.png
Mods tank ammo.png
12.7 mm API
Research:
220 Rp icon.png
Cost:
170 Sl icon.png
50 Ge icon.png
Mods new aux caliber turrets.png
Auxiliary Armament Targeting
Research:
220 Rp icon.png
Cost:
170 Sl icon.png
50 Ge icon.png
Mod arrow 0.png
Mods ship rangefinder.png
Improved Rangefinder
Research:
370 Rp icon.png
Cost:
280 Sl icon.png
80 Ge icon.png
Mods depth charge.png
Depth Charges
Research:
370 Rp icon.png
Cost:
280 Sl icon.png
80 Ge icon.png
Mods new main caliber turrets.png
Primary Armament Targeting
Research:
370 Rp icon.png
Cost:
280 Sl icon.png
80 Ge icon.png
Mods ship art support.png
Artillery Support
Research:
640 Rp icon.png
Cost:
480 Sl icon.png
150 Ge icon.png

The recommended modification research order is:

  1. Tool Set
  2. Fire Protection System
  3. 12.7 mm I
  4. Smokescreen
  5. 40 mm AP
  6. Rudder Replacement
  7. Improved Rangefinder
  8. Artillery

After that, research the rest of the seakeeping modifications, followed by the rest of the modifications in whatever order you prefer.

Armament

Primary armament

2 х Turret2 x 12.7 mm Vickers Mk.V machine gun
Ammunition4000 rounds
Belt capacity200 rounds
Fire rate600 shots/min
Vertical guidance-10° / 70°

The primary armament consists of four 12.7 mm Vickers Mk.V machine guns in two twin mounts, one on either side of the bridge. There are 4,000 rounds of ammunition available for each mount, 2,000 rounds per gun, for a total of 8,000 rounds. Stock, the mounts can traverse horizontally and vertically at a rate of 64°/s; with the "Primary Armament Targeting" modification installed, this is increased to 75°/s. Each gun has a belt capacity of 200 rounds and a cyclic rate of fire of around 600 rounds/min, though the outboard guns on both mounts fire slightly faster, around 685 rounds/min. With a stock crew, the guns can be reloaded in 13 seconds; with an aced crew, they can be reloaded in 10 seconds.

Msg-info.png Turrets are named sequentially, clockwise, starting at the bow
Primary armament guidance
No.1 Turret (starboard) No.2 Turret (port)
Horizontal Vertical Horizontal Vertical
±180° -10°/+70° ±180° -10°/+70°

There are three ammunition choices 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 24 24 21 18 16 15
12.7 mm I 20 19 16 14 12 11
12.7 mm API 24 24 21 18 16 15

Of the belts, the I belt has a noticeably higher damage output than both the Universal and API belts, both of which are about the same in terms of damage. Because it lacks any armour-piercing rounds, the I belt has slightly less armour penetration than the other two belts, but in general, any armour that can stop the incendiary round will also stop be able to armour-piercing round. For the most effectiveness, take only the I belt once unlocked, and switch the secondary 40 mm 2pdr Rolls Royce cannon to deal with armoured targets.

Secondary armament

Turret40 mm 2pdr Rolls Royce semi-automatic cannon
Ammunition1200 rounds
Belt capacity4 rounds
Fire rate231 shots/min

The secondary armament consists of a single 40 mm 2pdr Rolls Royce cannon mounted aft, with a maximum of 1,200 rounds of ammunition. Stock, the mount can traverse horizontally at a rate of 38°/s and vertically at a rate of 47°/s; with the "Auxiliary Armament Targeting" modification installed, this is increased to 45°/s and 55°/s respectively. The gun has a magazine capacity of 4 rounds and a cyclic rate of fire of 231 rounds/min. With a stock crew, the gun can be reloaded in 2.21 seconds; with an aced crew, it can be reloaded in 1.7 seconds.

Secondary armament guidance
Horizontal Vertical
±151° -12°/+60°

There are three ammunition choices 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

The best ammunition for general use is the HE belt, due to it having the highest ratio of HE rounds to AP rounds, making it the most effective against both aircraft and the vast majority of surface targets. Because of this, the HE belt should be the main ammunition once it is unlocked. Additionally, take a substantial amount of the belt as well for use against armoured targets. Alternatively, take only Universal if you want to avoid the reload delay between switching ammunition types, though this comes at the cost of lesser damage efficiency.

Additional armament

Setup 12 x Mk.VII depth charge
Main article: Mk.VII depth charge

MGB-61 has two possible loadouts:

  1. 2x Mk.VII depth charge
  2. Without load

Depth Charges

Mk.VII depth charges numbered according to their drop order (click to view a larger image).

The Mk.VII depth charges are carried amidships in front of the aft gun, one on each side. They are dropped one at a time in the following order:

  1. Starboard
  2. Port

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) HE armour penetration (mm) Armoured vehicle destruction radius (m) Fragment dispersion radius (m)
196 TNT 130 130 101 8 122

There is almost no practical reason to use depth charges on any naval vessel in the game. Although they usually result in a one-hit kill if used properly, they are extremely situational, requiring the player to close to point-blank ranges to even use them. In almost every case, anytime a depth charge could be used, the guns or torpedoes can be used instead to greater effect. In fact, depth charges tend to actually be a liability in battle, since they essentially act as exposed ammo racks before they're dropped. They can be shot at, and if destroyed, they have a chance to detonate, instantly destroying the boat.

Despite this, some success can be had in dropping them either next to, or in front of a large, slow target. If dropping them next to the target, remember the depth charge drop order, since it's most likely that only the depth charges dropped on the side closest to the enemy will deal any damage. If dropping in front of the target, rush in from the sides as quickly as possible and drop them all at once directly in front of the target. For both cases, set the depth charge time delay to the minimum 3 seconds, since any higher time delay will only allow the depth charge to sink further away from the target, giving them more time to move out of the way. Again, using depth charges is extremely situational, and they will only be a liability the vast majority of the time, so take them at your own discretion.

Usage in battles

As a motor gun boat, MGB-61's primary armament is actually quite good, unlike the previous vessels in its tech tree line. With four 12.7 mm Vickers Mk.V machine guns, the damage output is roughly comparable to two or three 20 mm cannons, and with a belt capacity of 200 rounds each, they can sustain fire for much longer than most contemporary autocannons. While most of her cannon-armed counterparts must reload after one or two kills, MGB-61 can easily take out multiple enemies in quick succession, making her well suited for aggressive playstyles. However, this firepower comes at the cost of a long reload, anywhere between 13 and 10 seconds depending on the level of the crew.

In addition to a long reload, the primary armament's firing arcs are also somewhat restrictive. Both gun mounts are unable to fire in a ~117° arc in the direction of the other mount, and at rest, both are unable to fire at anything within ~275 m directly behind the boat. When on the move, the bow will lift out the water, eliminating the rear blind spot, but also creating a new one in front of the boat that extends for several hundred meters where one or both of the mounts are unable to depress far enough to get guns on target.

With all of this in mind, play MGB-61 aggressively, but always be aware of the limits of the guns. Because of the long reload, be proactive with the reloads. Keep an eye on the ammunition counter and be sure to fire off any remaining ammo after engagements if there isn't much left in the belts, retreating to do so if necessary. A good time to start doing so is when there are around 250 rounds or less between all four guns. Additionally, because of the poor firing arcs, keep enemies either directly in front or directly behind you at all times so that all of the guns are able to fire, and be ready to speed up or slow down to eliminate the fore or aft blindspots as needed. MGB-61's survivability is rather average and is largely reliant on being able to destroy opponents before they can deal much damage in return, so not being able to fire for even just for a few seconds due to any reason will often result in your own destruction, especially while playing aggressively.

Lastly, if you come across any armoured targets that the 12.7 mm machine guns fail to penetrate — in particular, the Pr.1124 (1940), Pr.1124 (1945), and Pr.191 — switch to the secondary 40 mm 2pdr Rolls Royce cannon. This gun is more than capable of punching through any armour MGB-61 might come across, and it also has a higher effective range, making it useful for long-range engagements. However, its damage output is noticeably lower than the four machine guns, so only switch to it when required, but always be ready to do so on a moment's notice.

Pros and cons

Pros:

  • Primary armament: high rate of fire, large belt capacity, and good damage output
  • Secondary armament: very quick reload, high penetration with AP rounds, and good firing arcs
  • Good mobility

Cons:

  • Blind spot directly in front while moving at high speeds
  • Primary armament: long reload and poor firing arcs
  • Secondary armament: cannot fire directly forwards, small magazine capacity, and 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 — all three essentially being scaled-up 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 instead 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 ft (21.3 m), a beam of 16 ft 7 in (5.05 m), and a draught of around 3 ft (~1 m) depending on the boat. They were powered as follows:

  • MASBs 6-21: Ordered by the Royal Navy as MASBs, all were completed throughout 1940 and 1941. These were originally planned to be powered by Rolls Royce engines. However, these engines eventually 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 engines and could only achieve 23 knots. In 1942, they received stronger Packard engines, increasing their top speed to 38 knots.
  • MASB 46: Originally ordered by the Royal Netherlands Navy as an MTB, with the capitulation of the Netherlands before her completion in May 1940, 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 and could achieve a top speed of 42.5 knots.
  • MASBs 50-67: Originally ordered by the French Navy as MTBs, with the capitulation of France before the completion of most of the order in June 1940, 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 and could achieve a top speed of 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 all refitted with a standardized armament consisting of 2-pdr aft gun and a twin .50 calibre machine gun mount 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 a 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

Skins

See also

External links

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 class (P1011) · Dark class (FPB 1102) · Dark class (FPB 1102) TD · Fairmile D (617) · Fairmile D (697) · Fairmile D (5001) · MTB-1 1 series
  MTB-1 2 series · Vosper 1 series · Vosper 2 series
Motor gun boats  Dark class (FPB 1101) · Fairmile A (ML100) · Fairmile B (ML345) · Fairmile C (312) · Fairmile C (332) · Fairmile D (601)
  MGB-61 · MGB-75 · SGB (S304) · SGB (S309)
Gunboats  River class (K-246)