P-39 had a cannon which fired through propeller. Russians liked it in an anti-tank role.
PT boat crews in the Solomons liked to re-purpose those 37mm cannons as additional firepower. They were great against Japanese supply barges and other small craft.
“Russians liked it in an anti-tank role.”
They deny that, claiming it was a bad interpretation. I don’t think the type of ammo was designed for that.
Apparently, Busting a tank from the air was very difficult. Finding it was hard and hitting it was even harder.
https://en.wikipedia.org/wiki/Bell_P-39_Airacobra
We also sent the P-63 KingCobra to the Soviets which is an even better story