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A few questions- (a new fuel?)

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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A few questions- (a new fuel?)

Unread postAuthor: redchigh » Tue Aug 21, 2007 9:28 pm

I was looking around wal-mart and saw something called 3-2-1 Dry. It's used to dry nail polish, fake nails, etc. It's three main ingrediants are:
Propane, Butane, Alcohol. Think it would work as a fuel? :twisted:

My friend reccomends Carb starter fluid- think it will burst the gun?
What would you reccomend?

Also, are my stats ok?
Material is SCH-40 PVC
4'' Combustion chamber to 1.5" barrel... Volume ratios will be between .75:1 to 1.5:1... (interchangable barrels)
The first barrel will likely be for a 1:1 C:B Ratio- acceptable?
C:B ratio will be measured with water for accuracy.

Ignition- BBQ lighter attached to bolts in the rear of the chamber to place the gap in the rear-center

Thanks- This will be my first potato gun.
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Unread postAuthor: thespeedycicada » Tue Aug 21, 2007 9:31 pm

yes that will work fine and i think your stats are ok and no carb starter wont burst the gun.
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Unread postAuthor: redchigh » Tue Aug 21, 2007 9:39 pm

Oh one more thing- will tape (I was thinking heat-resistant foil tape or high-strength duct) keep pvc from shattering in as many splinters?

I'll probably do it anyway to keep sunlight from it (I heard it degrades PVC)
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Unread postAuthor: jackssmirkingrevenge » Tue Aug 21, 2007 9:41 pm

It would have to be really weak PVC to be shattered by a combustion but I suppose a few layers of tape couldn't hurt in the unlikely event of a failure.
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Unread postAuthor: singularity » Tue Aug 21, 2007 10:46 pm

sunlight degrades pvc very slowly like were talking years here (pretty sure its the UV rays) but the tape is still probably a good idea. i doubt it will stop the pvc shards (which are rarely a problem in a combustion) but it will help protect from UV
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