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Do you have any ideas how to make a ping-pong ball launcher that reloads automatic and shoots automatically?

Answer:

Air cannon is probably the simplest, PVC pipe from Home Depot and shoots things very far, can make any size you want, need a tire pump or air compressor to power it. It is also called Potato Cannons for obvious reasons. I shot a potato over 1000 feet with 60 psi and 2" pipe.

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