(formerly)Advanced tennis ball gun

[isban]

i made this for a school project like 2 years ago. it used to have a chamber fan, which broke, and a stun gun ignition that i swapped to another project. i still use it with propane and a peizo and it works great(nice and loud). since it was for school my parents paid for it and i used nice pressure rated parts and painted it. i was testing velocities with different fuels and i dont remember the numbers but one shot tore through the net we were using to catch the tennis balls and sailed into the backyard.

[starman]

Looks like you posted a partially decomissioned, dumbed down advanced combustion. Paint job looks good....that's about all we can tell about it at this point.

If you're interested in anyone taking this cannon seriously, include some closer, more detailed pictures and a more detailed write-up in your post.

[Giorgio]

i say... thats... well.. yeah a medium ranged spuddy.... because the only visiable difference between mine and yours is the regulated fuel system. Mine is a 4"Dia X50cm combust with a 2.5" barrel for tennis balls... and i have a small hole which i use butane cans to fuel my cannon... Activated by a BBQ lighter on a screw cap.... and now im going deaf because i only bought ear protection today...