Re: Most Powerful FIRST Team created T-Shirt Cannon
 

so, i'll have to finish my wireless robot-human are system to safely work on this.... oh well, i'll be wearing my safty goggles and cup, and not standing behind it,

Re: Most Powerful FIRST Team created T-Shirt Cannon
 

Worry a lot about hearing damage, sound is waves of air pressure, and you've got a lot of air pressure. An engineer I knew at a local research lab developed PTSD after an experimental fixture failed while storing a couple cubic feet of ~100psi air.

Re: Most Powerful FIRST Team created T-Shirt Cannon
 

when we fire ours it's most of the time at 80psi, the 125psi was just a test, and when we fire shirts at crowds it will be down to about 40-60 psi.

P.S. sorry for hijacking the thread lol.

you might be able to see this video
http://www.facebook.com/#!/video/vid...25764667445518

Re: Most Powerful FIRST Team created T-Shirt Cannon
 

T-shirt cannons are a fun topic in general; looks like we may have some cannon fodder for the Mythbusters to test!

Re: Most Powerful FIRST Team created T-Shirt Cannon
 

Yes they are. I had several in high-school, including a propane powered one. I feel the fuel-powered cannons are safer because the cannon is not sitting at full pressure with any small cracks continuously growing waiting for failure. Instead the pressure is applied rapidly, where the high strain rate tends to result in higher material strengths, and the pressure is prevented from building to critical levels because the projectile is already flying out and there are inevitably leaks around the ignition source and the threaded-on end cap.

I also found that one only needs a small combustion chamber, my best one was 1ft of 4" pipe, it could utilize the full length of a 10ftx2in barrel.

The only failure I've ever experienced with a pvc cannon was the pneumatic one.

Re: Most Powerful FIRST Team created T-Shirt Cannon
 

a 5-gal 150 psi rated air tank is like $30 at northern tool
it's what we use for ours, and you only want to go to 60 psi, otherwise the shirts go too far