It sounds impossible at first. How can a machine gun fire straight through a spinning propeller… without destroying it? Early fighter planes solved this with pure mechanical engineering. They built a synchronization gear that linked the gun directly to the engine’s rotation. The system only allowed bullets to fire in the tiny gaps between the propeller blades. If a blade was in front — the gun simply wouldn’t shoot. At thousands of RPM, every shot had to be perfectly timed. Not luck. Not magic.