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Engine gun
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French Hispano-Suiza 12Y aircraft engine (cylinders removed) with Hispano-Suiza HS.404 engine gun mounted
Luftwaffe soldier inspects the engine gun alignment of a Bf 109 fighter aircraft
Firing channel on a Daimler-Benz DB 605 for an engine gun.

An engine gun, or engine cannon (from German: Motorkanone, "motor cannon"), is an aircraft gun mounted behind and through the cylinder block of an inline aircraft engine (most often a V engine) with a reduction drive that displaces the propeller axle to be in line with the gun so that gunfire is allowed through the propeller hub. This allows for nose-mounted weaponry on aircraft without the need for synchronization gear while also permitting higher calibers for nose-mounted weaponry, which otherwise would be hard to adapt for synchronization gear.[1]

The first time this was done was during World War I when the French modified the Hispano-Suiza 8 engine to be able to install a 37 mm autocannon.[2] The concept was used widely before the Jet Age.

Historical engine guns

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Finnish guns

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French guns

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German guns

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Soviet guns

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Swiss guns

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Engine gun installations

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A geared-output shaft HS 8C engine for a SPAD S.XII WWI aircraft, showing the elevated intake manifold to clear the 37 mm cannon (shown to the right) mounted in the "V" between the cylinder banks.

French engines

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German engines

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Soviet engines

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Swiss engines

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Aircraft with engine guns

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References

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