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I lay in bed thinking last night what a perfect driving force one of those "impact" type cylinders would be for a hit and miss engine. After it fired and the flywheel went into "high revolution speed" mode, the lockout lever would simply interrupt the air supply to the cylinder. While the engine coasted (the miss part of the cycle), the air chamber would have time to recharge. When the flywheel slowed down enough, the governor weights would let the lockout lever return to it's normal position and let air flow resume, and the "hit" cycle would repeat. The air chamber requires a bit of time to recharge with air between shots , and the miss cycle of the engines would give it that required time.