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Problem with compressed air, ping pong turret Answered

Hello all, I am in the process of making a ping pong ball turret powered by an air compressor, I’m using a solenoid valve to trigger the air electronically.i have had some exact diameter steel pipe milled out which is 250mm, so the diameter of the balls are 40mm and the diameter of the pipe is roughly 40.5-41mm. And I’ve sealed off one end with a tapped out hole for a nozzle fitting. My compressor goes up to 7 bar -around 100,psi -. Do finally to the topic 0f my question, i have tested the firing of the balls by firing 7 bar through an compressor gun, and to my surprise it didn’t fire across the garage like I expected, instead it made a very high pitched noise and the ball vibrated inside the tube, eventually the ball would rise up the tube and eventually speed up towards the end of the tube but still only launched at most 1 meter. Any help on how to fix this problem would be excellent. As I expect 100psi through an exact diameter tube would fire the ping pong ball very far. Feel free to ask any questions if I haven’t been detailed enough. Cheers

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