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3rd Combustion Launcher, with video

Built a combustion cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Unread postAuthor: Boom_erang » Sat Dec 26, 2009 12:16 pm

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

[youtube]http://www.youtube.com/watch?v=oST4HBGPLEw[/youtube]

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.
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Unread postAuthor: Boom_erang » Sun Mar 21, 2010 12:32 am

New videos shot with a high-speed camera:

[youtube]http://www.youtube.com/watch?v=WqnpMmVK5VQ[/youtube]

[youtube]http://www.youtube.com/watch?v=U7zHYzRDB2s[/youtube]

Music by my old band, recorded in '91
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Unread postAuthor: Boom_erang » Sat Dec 24, 2011 1:25 pm

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.
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Unread postAuthor: jackssmirkingrevenge » Sat Dec 24, 2011 1:58 pm

I had missed the new videos, great job!
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Unread postAuthor: Gun Freak » Sat Dec 24, 2011 4:08 pm

Look sick man! Is that a camera tripod?
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Unread postAuthor: Boom_erang » Sat Dec 24, 2011 5:12 pm

Thanks guys! Yes - that's a Manfrotto tripod without the head.
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Unread postAuthor: sharpshooter11000 » Sat Dec 24, 2011 5:38 pm

That looks a lot better with the paint and the tripod! It's awesome :)
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Unread postAuthor: evanmcorleytv » Sat Dec 24, 2011 7:52 pm

lol, TWO YEARS to paint! Looks great now though!!
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Unread postAuthor: OneIntervention » Fri Jan 06, 2012 11:59 pm

Looks really great, I like the breech loading mechanism!
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