universal mems on Instagram: "The instagram reel shares an animated video explaining the synchronisation gear in WWII fighter planes like the Messerschmitt Bf 109, allowing machine guns to fire bullets through the propeller's rotation without striking the blades. This mechanism uses a hydraulic system connected to an oval cam disc that rotates with the propeller, precisely timing trigger pulls to align shots with blade gaps for safe firing. While highly effective, historical accounts note occasi