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Chamber and barrel help!

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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Chamber and barrel help!

Unread postAuthor: elad311 » Sun Nov 16, 2008 11:11 am

Ok, I found an awesome plastic fan for a combustion, it's really good
and it works with only one AA battery, BUT, the diameter
of the fan is 2.5", and i have a 2.5" pvc but i planned to use
it as a barrel in my next spudgun,
but it's really long so i thought to cut it,
and take a 25" piece as a barrel, but what barrel should i use?
2" or 1.5"?
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Unread postAuthor: Biopyro » Sun Nov 16, 2008 11:35 am

You could have either really, depends mostly on what ammo you want to fire. You could always use metered propane so a 0.7:1 ratio you wouldn't need too much chamber. How long is your 2.5"?
Personally I wouldn't build the whole project around something you could get for $7.

PS. make sure it definately fits before you design a cannon around it.
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Unread postAuthor: elad311 » Sun Nov 16, 2008 12:30 pm

the whole 2.5" pipe is 70"
and the fan fits perfect, and, i'll use a metered propane,
but i'm gonna attach the fan to the end cap so i'll be able
to use hairspray too.
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Unread postAuthor: starman » Sun Nov 16, 2008 1:22 pm

elad311 wrote:but i'm gonna attach the fan to the end cap so i'll be able to use hairspray too.


:roll: Uum why? You go to the trouble of getting setup to use one of the best fuels imaginable (propane) and still want to accomodate a low end fuel (hairspray)? :roll:

The fan on the end cap is fine...but please, do yourself and all of us a favor, move on and leave the hairspray on your mother's dressing room table.
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Last edited by starman on Sun Nov 16, 2008 1:25 pm, edited 1 time in total.
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Unread postAuthor: TurboSuper » Sun Nov 16, 2008 1:25 pm

You know, you can make a mounting bracket for a small fan with a spare piece of metal. You really don't want a chamber <3" anyways.
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