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Size parts

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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Unread postAuthor: toon » Wed Aug 04, 2010 4:38 pm

What is the best size of pipes and stuff for a potato gun?
Please in cm and m not in inch and stuff.

Thank u verry much. :D :D :D
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Unread postAuthor: clemsonguy1125 » Wed Aug 04, 2010 4:45 pm

Ok this question is impossible to answer without more info. Is it pneumatic or combustion. What is your primary ammo. What range and power do you want.
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Unread postAuthor: toon » Wed Aug 04, 2010 4:49 pm

It's combustion and gonna shoot with hairspray. and the more power the more fun
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Unread postAuthor: Gun Freak » Wed Aug 04, 2010 5:00 pm

@clemsonguy, this is in combustion cannon discussion, therefore it is a combustion cannon :wink: also he called it a potato gun, which means it will shoot potatoes.
@toon, a 1.5" sch 40 pvc barrel should fit most potatoes and if you use bigger potatoes then a 2" will work. Most common is 1.5" though. Oops in centimeters... hmm I don't feel like doing the math, lol.
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Unread postAuthor: toon » Wed Aug 04, 2010 5:16 pm

ty mate, i'll transfer in in google xD

My first combustion gun was i think a 2" (5cm)
And the chamber? whats best small,big? My father thinks tha bigger aint better.
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Unread postAuthor: Dave_424 » Wed Aug 04, 2010 5:58 pm

Im guessing that you are from the UK

Best chamber would be 110mm / 11cm pipe, It is harder to find pressure rated PVC in the UK so if your going with un pressure rated then go with ABS much safer.

Barrel I would go with would be probably 40 - 50mm barrel.

Bigger is always better. There is no replacement for displacement :D

If your serious about building a good cannon, and not a cheap one with bits you can find, I can put you onto a good few PVC suppliers in the UK

Just private message me because it is late here and I can't be bothered to go searching at this time (12:00 PM/)

Dave
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Unread postAuthor: clemsonguy1125 » Wed Aug 04, 2010 6:02 pm

[quote="Gun Freak"]@clemsonguy, this is in combustion cannon discussion, therefore it is a combustion cannon :wink: also he called it a potato gun, which means it will shoot potatoes.
My bad I missed that, and most people with spud guns dont shot spuds, Ive had the best luck with 1.5 inch so 4 cm barrels(estimate conversion) and 36 inch 3 inch so 7.5 cm chambers
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Unread postAuthor: ramses » Wed Aug 04, 2010 6:47 pm

Dave_424 wrote:Bigger is always better. There is no replacement for displacement :D



boost helps... :D :D

Bigger is only better when the fuel burns before the spud leaves the barrel. I recommend playing around with HGDT to find where performance drops off with larger chambers.
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