Profile
Marmon-Herrington
M22 Locust
The M22 Locust was designed to fulfill the need for an airborne light tank following the rapid expansion of the US's parachute forces shortly before its entry into World War II. The British were also involved in the project, having requested such a tank to be carried by glider. The M22 had a welded hull and cast turret, and was armed with a 37-mm M6 gun. However, armor protection was poor, being vulnerable even against armor-piercing .50-in rounds. Its greatest deficiency, however, was in its airlift capability. In US service, it was designed to be carried under a C-54, but this required the removal of the turret which delayed its readiness on the battlefield. In British service, it was able to be fitted on a Hamilcar glider, however, yet it saw combat only briefly during the crossing of the Rhine in February 1945 with the 6th Airborne Division. US and British units were retired after the war but some were supplied to the Egyptian Army.

Various proposals were offered for the US Army's airborne light tank design, of which the Marmon-Herrington prototype, the Light Tank T9 was accepted. Numerous structural improvements (including brackets so it could be slung under a C-54) resulted in the T9E1 which was later renamed M22. No other variants were produced.

M22 Locust (US Army)
M22
Datafile
DesignM22
NameLocust
Code Name-
TypeLight Tank
Year1944
Crew3
Dimensions
Length3.94 m
Width2.16 m
Height1.85 m
Weight
Loaded7,439 kg
Ground Pressure0.51 kg/cm²
SuspensionVertical volute
Performance
Range217 km
Speed48 / 64 km/h
AmphibiousNo
Fording0.97 m
Vertical Obstacle0.32 m
Trench1.65 m
Gradient60%
Powerplant
Engine1 x 162hp
Lycoming
0-435T
FuelGasoline (V6)
Power/Weight21.78 hp/t
Armament
Main37-mm (L/53)
M6
Rifled
Traverse360°
Elevation-10° / 30°
Penetration48 mm @ 500 m
Rounds50
Secondary1 x 7.62-mm (c) x
Armor
TypeSteel
Thickness10 - 25 mm
Max Effective30 - 40 mm RHAe
Hull Upper Front12.7 mm / 65°
Hull Lower Front25.4 mm
Hull Upper Sides10 mm / 45°
Hull Lower Sides12.7 mm
Hull Rear12.7 mm / 9°
Hull Top12.7 mm
Hull Bottom10 mm
Turret Mantlet25.4 mm / 50°
Turret Front25.4 mm / 30°
Turret Sides25.4 mm / 5°
Turret Rear25.4 mm
Turret Top19.05 mm
Production
Built830
Total830