Aaron Collins: the rubber I'm using keeps failing. I noticed in the film between you gluing the rubber down and inserting it into the chamber there is definitely more than just the rubber sheet. Is there some kind of liquid gasket you use to make a good seal? Please help, I'm running out of time on this project and I will have to abandon your design. Thanks for your time
Corbin Rego: Hi! We built the cannon and followed all the instructions. We used a hockey puck as the piston. We applied TFE Paste to the pack. The barrel is becoming air tight but when we open the valve the air escapes from the back but the piston doesn't move therefore the cannon doesn't shoot. I was just wondering if you have any suggestions. Thank You!
Adrian Widjaja: We followed all your steps and our cannon isn't working. The piston is stuck and isn't moving to cover the barrel. Therefore our cannon isn't shooting and the air is rushing out through the barrel. Also, even when it does cover the barrel we compress to about 30 PSI. When we release the air using the valve no air exits from the front on the cannon. Only from the valve. We are using a hockey puck as the piston and were wondering if you have any suggestions. Thank you!
Adie Listiyo: Can i buy from you?
Seth Roy: Any ideas if nerf rockets would work on this? or Eballs? Im trying to make it into a mortar for airsoft Also is there another type of release valve that I could use? Like a pull or maybe a trigger type?
Liam ODonnell : How much did it cost u to make it?
Shadokiller101: Can I pay you to make one for me?
Joshua Cope: can this shoot water balloons?
Crystal N Matt Sniffen: Trying to find what went wrong. It doesn't shoot the potatoe but shoots backwards.
nate porter: could you make a video of this with a half inch cpvc barrel for nerf darts
nald rus: so many work...
Gary Morgan: I can not find the 3x2" reducing bushing without a flange on it. Can anybody tell me where they found one?
Bonnie Hayes: Someone shot one of these at my brand new car. It damaged the paint. You shouldn't be teaching kids how to make one of these.
Julian Shu: Can you make one that can be breach loaded?
Shipman Sailor: is there a ratio to increase the size for a tennis ball?
I built this over the weekend and can't seem to get mine to pressurize...everything seems in order. The only notable exception is that my 3" to 1 1/2" reducer is cone shaped instead of cylinder shaped (I couldn't find the same type here at Lowes or HD).
My piston seems to be snug yet slide in the 3" outer tube, and I used a couple of layers of the rubber sheet to help the 2" pipe seat better. I sanded the 2" pipe end with a 2000 grit paper and it is really smooth.
I have some photos if you need to see them...any thoughts are much appreciated. I want to use it to launch a toy parachute man with the kiddo! thanks!
Do you need a potato slug regardless of any other payload?
Shix Lo: must put it in a ships
LeAsia Johnson: What is your email? We are trying to build this exact canon for a physics project and we have no clue what to do and I have a few quick questions
leevisuals 804: Very cool, question can this canon shot anything??
Just Francis: I will report you for Potato Abuse.
How to Make a Powerful Coaxial Piston Cannon from Hardware Store Parts5
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