INERT 37x145R HE round fitted with P.D. fuse M56
Used in the Gun M4 fitted to the P-39 Airacobra
The M4 Auto cannon was fed by a 30 round endless belt gaving a cyclic r.o.f of 150rpm. The 1.34lb (608g) M54 HE round had a muzzle velocity of 2000fps and was fitted with a self-destruct tracer which detonated the shell after three seconds of flight.
The P-61 was highly regarded by the Soviets during WW2, the US supplying 1,232,991 rounds of M54 for use in Lend Lease Airacobra's. The same round was also used in the M10 cannon fitted to the P-39 Kingcobra which had a slightly higher cyclic r.o.f at 165rpm.
Case and projectile dated 1941, fuse 1943.
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