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help with igniteing

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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help with igniteing

Unread postAuthor: fastcannonman » Thu May 31, 2007 9:32 pm

i built a pritty nice combustion cannon the other day, and i tested it out today. (i made shure all the glue was dry). my chamber is a simple one. 3" pvc pipe, two screws a quarter inch apart. and a bbq igniter. everything works, but when i put the hairspray in, it wont ignite. ive put small amounts of hairspray in, to larg amounts. its not just lightin. could anyone plz help me on how to fix this problem??
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Unread postAuthor: Pete Zaria » Thu May 31, 2007 9:36 pm

The most common problem is too much aerosol. A half second spray is usually enough. Try using almost none and work up from there.

Another common problem is that the fuel and air aren't mixing well enough - this is why we use chamber fans. An old computer fan and a 9v battery will do the trick.

Are you venting out the chamber between shots to make sure the exhaust gases from the previous shot aren't messing up your fuel/air mix?

Try some other fuels. If you don't have the money to build a propane meter (one can be built for around $30...) then try carborator cleaner or engine starter fluid.

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Unread postAuthor: fastcannonman » Thu May 31, 2007 9:38 pm

i have a old compter fan in it, but it skips from time to time. i try to air it out using one of thoes air cans. could that be the problem? :?
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Unread postAuthor: Pete Zaria » Thu May 31, 2007 9:45 pm

fastcannonman wrote:i have a old compter fan in it, but it skips from time to time. i try to air it out using one of thoes air cans. could that be the problem? :?


Quite possibly so.

Switch to a fan that works and try using that without the canned air. I bet that will solve your problem.
Also, seriously, try some other aerosol fuels. Look for engine starter fluid or carborator cleaner.

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Unread postAuthor: homedepotpro » Thu May 31, 2007 9:51 pm

are your screws drilled through the pipe a quarter inch apart
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Unread postAuthor: fastcannonman » Thu May 31, 2007 9:54 pm

the two end points are a quarter inch apart. sould i moov them farter?
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Unread postAuthor: homedepotpro » Thu May 31, 2007 10:21 pm

no, if anything closer, sometimes the spray gets on the inside of the chamber and conducts the current around the inside chamber and away from the spark gap
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Unread postAuthor: gotbass7 » Thu May 31, 2007 10:25 pm

just blow and shake a lot. its easier to do then install a fan. install a fan later, and hand mix for now.
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Unread postAuthor: fastcannonman » Thu May 31, 2007 10:26 pm

should i put small pices or rubber around the screws at the top on the inside
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Unread postAuthor: pyromaniac » Thu May 31, 2007 10:33 pm

If you have any oust around try that works great got my smalish combustion. its not a min i its small though. 1 inch chamber and 3/4 barrel.
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Unread postAuthor: fastcannonman » Thu May 31, 2007 10:37 pm

ok ill try that
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Unread postAuthor: SpudBlaster15 » Thu May 31, 2007 11:00 pm

fastcannonman wrote:i try to air it out using one of thoes air cans. could that be the problem?


Those cans do not contain "air". They contain diflouroethane. That is your problem.
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Unread postAuthor: fastcannonman » Thu May 31, 2007 11:02 pm

thanks becuase now i read the back lable. well i found my problem
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