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The Engineering of Propeller Synchronization The synchronization gear (often referred to as an interrupter gear) represents a milestone in mechanical engineering, solving the problem of firing forward-mounted machine guns through the rotating arc of an aircraft propeller without causing catastrophic damage to the blades. At its core, the system transforms the continuous motion of the engine into a precisely timed, intermittent firing cycle. The Mechanical Principle The mechanism acts as a mechanical "gate" or logical AND operation: the gun can only fire if the pilot pulls the trigger AND the propeller is in a "safe" position. Timing Cam: A cam is keyed directly to the engine crankshaft or a 1:1 driven shaft. The lobe profile is ground to a precise angle (typically 8–12° of rotation), corresponding to the brief window of time when the propeller blades are clear of the gun barrel. Cam Follower: A hardened steel roller or tappe...