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Forums
4hv.org :: Forums :: General Science and Electronics
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Film canister cannon

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Chris
Sat Dec 30 2006, 10:25PM
Chris Registered Member #8 Joined: Thu Feb 02 2006, 04:34AM
Location: Harlowton, MT, United States
Posts: 214
 		Anyone tried with acetylene (like put a little chip of calcium carbide in there with water)?
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ragnar
Sat Dec 30 2006, 11:20PM
ragnar Registered Member #63 Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425
 		How about acetone? Volatility guaranteed. =D
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...
Sun Dec 31 2006, 02:12AM
... Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
 		Speaking of acetylene, I have a small cannon that uses calcium carbide + water to fire. It is made of cast steel, about 1/2" thick, with a 1/2" bore that is about 3" long. You add in a few mg of Ca(CO3)2 and then hit the little flint to fire it. If you get the mixture right it produces a pretty loud bang, but the fun starts when you put a 1/2" cotton (or nylon) ball in the bore, then fire. So far my personal best is about 30' horizontally.

But when you get tired of that, set your oxy/acetylene torch for a neutral flame, hit it against the bench to blow it out, then fill a (small) sandwich bag... Put in a paper bag, light paper bag, run away. Man those are loud! Life rocks when you have hippie parents wink
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Bored Chemist
Thu Jan 04 2007, 01:20PM
Bored Chemist Registered Member #193 Joined: Fri Feb 17 2006, 07:04AM
Location: sheffield
Posts: 1022
 		What's "Ca(CO3)2"?
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Steve Conner
Thu Jan 04 2007, 03:40PM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
 		... is this some new definition of hippie that encompasses firearms, explosives, rocketry and all kinds of pyrotechnic mayhem? shades

BC, I guess Ca(CO3)2 is calcium supercarbide wink
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...
Thu Jan 04 2007, 05:12PM
... Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
 		oops, I have a tendency to put carbonate whenever I hear carbon in an ionic compound, of course Calcium Carbide is just CaC2 angry

at risk of getting too far off topic, @ steve... Both my mom/dad were pretty hardcore hippies, but as my dad got older he began to fall to the pyro mentality, and then when he hit 40 he has shiftted to rockets/guns. But that would take to long to explain...
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Sulaiman
Thu Jan 04 2007, 10:05PM
Sulaiman Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
 		When I was living in Malaysia, every festive season someone would be seriously injured,
by an exploding 'bamboo cannon' - very popular;
Calcium carbide in water in a large (over 6" dia) bamboo - then lit.
Fantastic BOOM!, if you get it just right (?) the explosion is so fierce that the bamboo shatters into a fragmentation (splinter) bomb - hence the deaths and maimings.

P.S. In my youth I had one very nasty indoor explosion due to a pressurised stoichiometric Acetylene/Oxygen mixture so DON'T DO IT AT HOME KIDS!
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Marko
Thu Jan 04 2007, 10:30PM
Marko Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
 		Calcium carbide was popular here probably until some 10 years ago, except it was done in metal paint cans (it's all about availability it seems).

Today's pyrotechnics are much safer than these unless you do something really dumb with it.

If you use the cannon indoors gaseous or more weakly-flammable liquids are good.

I think it would be unwise to use gasoline or toluene and set the house on fire in process, or at least the can.

SOme fuels may also destroy plastics it is made off.
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