SpudFiles

Christmas eve: check.
Brother in law: check.
Frozen carrots: check.

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Got some o-rings today so I can seal the chamber at the barrel junction and try for a 2x mix with foil or scored soda can burst disk. Calculations show that if I pressurize the chamber at 2x and the disk bursts at 40psi, I should get >1,000 fps with the plastic ball ammo, and still be within safe pressures for this design. That's 300 ft lbs! Need to be careful not to shoot through a wall or a garage door...

UPDATE: was not able to get the chamber to seal. I think the threaded coupling between the chamber and the barrel is leaking. Tried Teflon tape - may need to try again with more tape.

New videos shot with a high-speed camera:

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Music by my old band, recorded in '91

SpudBlaster15 wrote:It looks better, but I still think the wooden board seems out of place. Perhaps a coat of black paint would enhance its appearance.

Apologies in advance for raising this super-old thread, but it was either that or start a new thread with an old cannon. I finally got around to giving this launcher a well-deserved facelift. I also added a forward handle which makes it easier to hand hold.

I had missed the new videos, great job!

Look sick man! Is that a camera tripod?

Thanks guys! Yes - that's a Manfrotto tripod without the head.

That looks a lot better with the paint and the tripod! It's awesome

lol, TWO YEARS to paint! Looks great now though!!

Looks really great, I like the breech loading mechanism!