Twin 40mm Self-Propelled Guns M42 Duster SDF

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Arcade Realistic Simulator

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General info

The M42 Duster in the garage.

The Twin 40mm Self-Propelled Guns M42 Duster SDF (or just M42 Duster SDF) is a Rank IV Japanese self-propelled anti-aircraft vehicle with a battle rating of 6.3. It was introduced along with the entire Japanese Ground Forces tree in Update 1.65 "Way of the Samurai".

The main purpose, usage and tactics recommendations

General play style

The M42 "Duster" is a self propelled anti-air vehicle. Not much more to say. Stay behind and close to allies, but outside the enemies view-range and with clear line of sight to the horizon for low aircraft.

Compared to certain other SPAAs (ZSU-37, Wirbelwind, Multiple Gun Motor Carriage M13, etc.) the M42 cannot be used effectively in an anti-vehicle role. The average battle-rating is to high and the penetration value of the AP shells to low. The armour is not strong enough against the devastating tank HE shells. However the armour performs okay versus machine gun fire from aircraft, but auto-cannon fire is a problem. Thankfully the fuses of most tank APHE shells are not very sensitive, rendering the HE content useless and the entire shell into a mere AP solid shot. But, the machine is tiny and damage still very likely.

With the dual 40mm Bofors the Duster has an excellent tool versus bombers and armoured attackers. Reserve the fire for certain hits. Against fighters the same tactic should be applied. There is no reason to spam the fire, unless sitting on cap-point for rearming. A thing to note is the unsynchronized fire of both Bofor cannons. It increases fire density in the air, but reduces simultaneous punch against the target. An advantage against aircraft, but a disadvantage against ground vehicles. Yet it is not very likely to actually do damage to the tanks this vehicle usually faces anyway.

Vehicle characteristics

Tactics

Specific enemies worth noting

Counter-Tactics

Pros and cons

Pros

  • 40mm cannons are devastating to planes
  • Relatively fast vehicle
  • Fast turret traverse rate
  • Good mobility

Cons

  • Open turret that exposes the crew
  • High explosive shells usually can knock out the crew
  • Careless diving can damage the vehicle
  • Easily ammo-racked
  • Decreased mobility off-road
  • Little armour

Specifications

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Armaments

2 x 40 mm M2 Cannon
  • Ammunition Capacity: 480 Shells (8 rounds magazine each gun)
  • Gun Depression: -3°
  • Gun Elevation: 85°
  • Fire Rate: 120 rounds per minute
  • Turret Rotation Speed: 23.8°/s (Stock), _._°/s (Upgraded), _._°/s (Prior + Full Crew), _._°/s (Prior + Expert Qualif.), _._°/s (Prior + Ace Qualif.)
  • Reload Rate: 0.6s (Stock), __._s (Full Crew), __._s (Prior + Expert Qualif.), __._s (Prior + Ace Qualif.)
2 x 40 mm M2 Cannon
  • Ammunition Capacity: 480 Shells (8 rounds magazine each gun)
  • Gun Depression: -3°
  • Gun Elevation: 85°
  • Fire Rate: 120 rounds per minute
  • Turret Rotation Speed: 23.8°/s (Stock), _._°/s (Upgraded), _._°/s (Prior + Full Crew), _._°/s (Prior + Expert Qualif.), _._°/s (Prior + Ace Qualif.)
  • Reload Rate: 0.6s (Stock), __._s (Full Crew), __._s (Prior + Expert Qualif.), __._s (Prior + Ace Qualif.)
2 x 40 mm M2 Cannon
  • Ammunition Capacity: 480 Shells (8 rounds magazine each gun)
  • Gun Depression: -3°
  • Gun Elevation: 85°
  • Fire Rate: 120 rounds per minute
  • Turret Rotation Speed: 23.8°/s (Stock), _._°/s (Upgraded), _._°/s (Prior + Full Crew), _._°/s (Prior + Expert Qualif.), _._°/s (Prior + Ace Qualif.)
  • Reload Rate: 0.6s (Stock), __._s (Full Crew), __._s (Prior + Expert Qualif.), __._s (Prior + Ace Qualif.)

Ammunition

Ammunition Penetration in mm @ 90° Type of
warhead
Velocity
in m/s
Projectile
Mass in kg
Fuse delay
in m:
Fuse sensitivity
in mm:
Normalization At 30°
from horizontal:
Ricochet:
10m 100m 500m 1000m 1500m 2000m 0% 50% 100%
Default 76 74 62 45 33 24 AP-T, HEFI-T N/A N/A N/A N/A N/A N/A N/A N/A
Mk.II 9 9 9 9 9 9 HEFI-T 874 0.86 0.2 0.1 28° 21° 17°
M81A1 76 74 62 45 33 24 AP-T 874 0.88 N/A N/A -1° 43° 30° 15°

Belts

  • Default : Mk.II, M81A1 : These work fine, a hit on an aircraft means certain death for it and still is able to hurt some ground vehicles when shot into the side of a enemy tank.
  • Mk.II  : Mk.II : These mean certain death for aircraft, what should be used for AA work.
  • M81A1  : M81A1 : These are the worst belts against airplanes. however, they are able to some ground vehicles when shot into the side of a enemy tank. If you plan on killing tanks with this belt you must flank, since side shots are they only ones with a home of penetration and only on some tanks. In general having a few Default belts is a better idea.

Ammo racks

Ammo racks of the M42 Duster
Full
ammo
1st
rack empty
2nd
rack empty
3rd
rack empty
4th
rack empty
Recommendations Visual
discrepancy
60 50 (+10) 38 (+22) 14 (+46) (+58) Keep Full Yes

Crew

  • Commander
  • Gunner
  • Loader 1
  • Loader 2
  • Machine gunner
  • Driver

Total: 6 Crew members

Armour

Armour Type:

  • Rolled homogeneous armour
Armour Front (Slope angle) Sides Rear Roof
Hull 12.7 mm (33°) Front glacis
25.7 mm (39°) Bottom glacis
12.7 mm 12.7 mm (58°) Top
19 mm (29-37°) Bottom
12.7 mm
Turret 12.7 mm (0-62°) 8 mm 8 mm N/A

Notes:

  • Suspension wheels and tracks are 15 mm thick.
  • Belly armour is 32 mm thick.

Engine & Mobility

Weight: 22.6 ton

Max Speed: 79 km/h
Stock

  • Engine Power: 710 hp @ 2800 rpm
  • Power-to-Weight Ratio: 31.41 hp/ton
  • Maximum Inclination: 29°

Upgraded

  • Engine Power: 874 hp @ 2800 rpm
  • Power-to-Weight Ratio: 38.67 hp/ton
  • Maximum Inclination: 36°
Weight: 22.6 ton

Max Speed: 72 km/h
Stock

  • Engine Power: 442 hp @ 2800 rpm
  • Power-to-Weight Ratio: 19.56 hp/ton
  • Maximum Inclination: 31°

Upgraded

  • Engine Power: ___ hp @ 2800 rpm
  • Power-to-Weight Ratio: __.__ hp/ton
  • Maximum Inclination: __°
Weight: 22.6 ton

Max Speed: 72 km/h
Stock

  • Engine Power: 442 hp @ 2800 rpm
  • Power-to-Weight Ratio: 19.56 hp/ton
  • Maximum Inclination: 31°

Upgraded

  • Engine Power: ___ hp @ 2800 rpm
  • Power-to-Weight Ratio: __.__ hp/ton
  • Maximum Inclination: __°

Modules and improvements

The 40mm Bofors come with a very annoying stock belt a mix of AP and HE. Always wasting 50% of the clip in anti-vehicle, or anti-aircraft role. "Mk.II" ammo should be the first stop. The next important unlocks are "Parts", "Turret Drive" and "FPE". Mobility upgrades are not really necessary for a stationary AA. The rest can be unlocked at your leisure. __MODIFICATIONS__

History of creation and combat usage

Development

During late World War II and the Korean War, the US Army were using the Twin Gun Motor Carriage M19 as their main armoured forces anti-aircraft gun. However, during the Korean War, the US Army decides to phase out their M24 Chaffees and its variants, M19 included, in order to implement newer designs made in the time period. One of these newer designs was the development of the M41 Walker Bulldog light tank. The 40 mm armament on the M19 was deemed effective enough to continue usage past the M19, so the turret of the M19 with the twin 40 mm cannons were taken off the chassis and modified to fit the chassis of the M41 light tank, which had a larger turret ring than the M24 Chaffee. This installment of the anti-aircraft armament onto the M41 light tank was designated as the M42. The production of the vehicle began in early 1952 at the General Motors Cleveland Tank Plant and entered service in 1953, replacing the many other self-propelled anti-aircraft vehicles the army was fielding. Production continued from 1952 to December 1959, ending with a total number of 3,700 units. During the production, the M42 was upgraded in 1956 with a new engine and other upgrades common with the M41 light tank, this upgraded variant was the M42A1.

Japanese Service

To be written

Screenshots and fan art

Skins and camouflages for the _____ from live.warthunder.com.

Additional information (links)

References


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jp_m42_duster.png

Icon-country-jap.png M42 Duster
Nation Japan
Type SPAA
Rank 4
Battle Rating
6.3
6.7
6.7

   Metric✓       Imperial   

   Metric       Imperial✓   

Characteristics
Weight
22,600 kg
49,824 lb
Number of Crew 6
Hull armour thickness
12.7/12.7/19/12.7 mm
0.5/0.5/0.75/0.5 inches
Statistics
Engine power (stock)
710 hp
442 hp
442 hp
Engine power (upgraded)
___ hp
500 hp
500 hp
HP/ton ratio (stock)
31.41
31.92
19.56
19.87
19.56
19.87
HP/ton ratio (Upgraded)
__.__
__.__
22.12
22.48
22.12
22.48
Max speed
79 km/h
49 mph
72 km/h
45 mph
72 km/h
45 mph
Main Weapon
2 x 40 mm Bofors Autocannon
Ammo stowage 480 rounds
Vertical guidance -3°/85°
Economy
Required RP 95,000 RP
Vehicle cost 260,000 SL
Crew training cost 75,000 SL
Max repair cost*
7,230 SL
1,000 SL
4,000 SL
Free repair time (Stock)
6d 09h
6d
6d 18h
Free repair time (Upgraded)
_d __h
_d __h
_d __h
Warning: this sidebar is a WIP and can be incorrect. Last updated 1.77.2.170.