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How can i make a "one way air nozzle" (a nozzle where air goes forward but not back)? Answered

I'm making water rockets. pocket sized ones. those fly ~5 meters. i want to improve the results and move forward to bigger rockets, by making a one-way air nozzle. the air will need to go inside the rocket, but not out. i tried it with my simple bicycle pump, but the air leaks. please give me instructions or suggestions, and i cant buy a new pump. my rocket should meet the requirements of a simple, cool, pocket sized, homemade rocket.


Find an old bicycle inner-tube and cut out the valve section. It will have either a Presta or Schrader valve. Silicone rubber sealant would probably be best for fixing it into the rocket.

hay good idea! i will try it. i think you will get "best answer" from me. good job!


8 years ago

well, actually i mean the air goes out from the pump. its not build for high pressure. a simple ball pump. when i attach it to a ball, you can hear the air leaking.

Take the pump apart (if you can) and see where it's leaking. You may need to fix a rough spot or make the spring that holds the valve a little stronger. Or you may need a different pump.

its not leaking.(i think). its just not built to hold air. i mean, its a cheap pump, the only way to keep it not leaking is to pump fast.

yea i know that site. i like it. but i didn't find anything there.

If you really want a one-way valve: websearch "check valve".