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I recently read that a Russian ace who scored 30 in the P-39 had his mechanics perform one important modification: he had them rig the machine gun trigger to fire the 37mm cannon too. He said that the position of the original cannon button made a pilot move the stick to fire it, thus throwing off aim. Maybe that's why US pilots complained the cannon couldn't hit anything?
Interesting.

Alexander Pokryshkin - Wikipedia

Look under "Aircraft Flown By..."
 

Hello jmcalli2,

I believe there is a slightly different explanation to this, but I need to look through a manual to confirm.

- Ivan.
 
Probably the cannon is definitely not a 37mm and it even looks to small with my eyes to be a 20 mm. I have never heard of anyone putting a 50 cal or 30 cal in the nose. But think of all that extra ammo.
The barrel is the same shape as the 20mm used in P-400.
 

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