How WWII fighter planes were able to shoot through the revolutions of the propeller.

This was recorded in the Canada Aviation Museum in Ottawa, Ontario. Interrupter gear : From Wikipedia, the free encyclopedia An interrupter gear is a device used on military aircraft and warships in order to allow them to target opponents without damaging themselves. The term covers two related technologies: the first, more accurately referred to as synchronization gear, or a gun synchronizer, is attached to the armament of a tractor-type craft so that it can fire through the arc of a spinning propeller