Air supply- is the crossbow permanently hooked up to a constant air supply line? Or does it have an onboard air tank? If on board tank, how much air volume? If your going to be using a pneumatic system to pull the bow string back into firing position and place a bolt/arrow into the ready position you would need a pneumatic power system that can repeat several times without loosing pressure- much like a paintball gun or air powered pellet gun. I can see it being done, but not a hand held crossbow, it would resemble a smaller high tech version of Leonardo DiVinci's infantry powered auto/self loading crossbow contraption. Then you would need a pneumatic manifold, and a spring loaded 3 position valve that would work via the trigger, or you could have a small 6v system and have solenoid valves. A self loading crossbow mechanism, a guess it would be some type of gravity fed device that would have an interrupter to allow only one arrow to be inserted at a time. Weight could be an issue, most pneumatic cylinders are aluminum though. Having said that, how much force does it take to pull the string on the crossbow back the total distance? What ever that number is, you would need a pneumatic air cylinder with greater force, and to get that force you would need to either have (a) a large bore air cylinder or (b) high pressure air cylinder. But you are limited to the amount of air line you have. Hypothetically, if your crossbow is constantly being supplied compressed air via air compressor, then it could work for the amount of bolts/arrows you have. It can only work for so long until it has exhausted all of its stored power.
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