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And the P-38 solved the problem in another way.
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The P39 Air Cobra was a little different also, that was the plane with Hudson type car doors and the engine behind the pilot. To turn the prop they ran a drive shave forward to a gear system with a hollow center. The Russians loved the cannon that fired through the center of the hub. The ME109 was not a direct drive propeller, the center firing cannon on the 109 did not fire through the propeller, it fired through the hub.
And then there was the P39 counter rotating propeller with two drive shafts.
F. Guffey