how did propellor warplanes shoot their machine guns through the propellor?
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The trigger inside the cockpit was not directly pulling the trigger on the machine guns, instead it allowed the machine guns to fire by allowing the trigger mechanism to operate through a synchronisation mechanism that was not much unlike the camshafts which operate valves in engines. Camshafts with cam lobes that were timed to the engine rpm would only allow the machine guns to fire when the propeller blades were not directly in front of the barrels. This timed when the machine guns fired, and their overall fire rate, so that they could shoot through the propeller. I know propellers are moving very fast, but so are bullets so it was possible.
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