Here’s a clip showing how it’s pressurized using a bike pump, the loading process, and a shot at a more modest 45 PSI. The TPU stock butt pad does a decent job absorbing recoil energy.

I designed a 3” diameter quick dump valve cannon using a novel trigger mechanism. It’s printed in PETG, has a 2 L air tank, an 18” barrel, fires a Chuck It Ultra ball at 147 mph and fits in backpack!

Assembled with background removed
https://imgur.com/wjam2xm.png

Posed on one of my two Bambu A1 ...

Thanks!

The main limiting factor for this cannon is my test system. I like to have at least a 2x safety factor. My current bike pump and compressor really bog down after 100 PSI so I stay under 50 when actually using it.

I hydro test with water since it’s not compressible and won’t violently ...

I wanted to showcase my 3D printed air tank and barrel. I made both by printing a thin shell followed by wrapping it in carbon fiber. I have it attached to a 2” modded sprinkler valve. The valve is rated for a 100 GPM flow rate.

Barrel uses an interrupted screw breach to connect to the valve. It ...

Sorry I didn’t see that that was a sticky for these questions. Feel free to delete this one

Hello,

Would someone be able to run a few GGDT scenarios for me? I’d like to compare a pneumatic with a 3” ball valve vs a 3” air actuated sprinkler valve vs a 3” piston valve. I recently spent quite a lot ...

Thank you! I’ve always found pneumatics to be the more elegant option in comparison to combustion cannons. This may be due to my background with spring and pneumatic nerf guns.


I was filling from the pilot area. My first piston may have had too big of a notch cut in front of the o-ring to act as a ...

I made a tennis ball cannon using a 3” sprinkler valve. It fires a ball at ~150 yards at just 30 PSI. The valve is manufactured by Dorot, repackaged by Galcon, and sold by Drip Depot. The stated flow rate is 390 gallons/minute which is 10x the flow rate of an average 1” sprinkler valve. The valve is ...

Thanks! Do you have any tips on how to make it both interesting and authentic?

I wondered about the background music. At the time I did it kinda as a a joke. Just to make sure, I made sure my teacher watched the video with the sound off.

What did you think of the last couple of slides (starting with Theodore Roosevelt)? How was the transition from his speech to the song? Did ...

Check out my power point I made for history. I really don't care about the actually information, but feedback on the transitions and music would be nice.

http://www.hdshare.tv/video/3719/The-Pr ... e-Movement

I just looked at this really quick, but do you think it will solve the problems that most full auto designs have with the bolt just hanging open after the air is let in?

Hehe, I remember when I first saw that when I was part of that Nerf forum. I couldn't stop thinking about it for days.

Thanks everybody

I'm asking for help because I really don't know what kind of regulator I should get. Of course I know that Home Depot, Lowes, and Mcmaster all have regulators, I just assumed that someone here would be able to recommend a regulator that they had success for spudfiles-ish projects.

I want to build a ...

Can anyone recommend a good non-relieving air pressure regulator for use in an external air tank? Preferably something that I can pick up at a Home Depot, Lowes or order from Mcmaster.

Thanks