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First Potato Gun "improvements/feedback"

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: Mr.Tallahassee » Fri Oct 28, 2011 7:44 pm

That is a plain combustion cannon. If you made it hybrid then you could easily break the speed of sound as Mr.Crowley has(although supersonic lemons are scary enough)
You would need to make the cannon from steel to do that. Other wise you just have a bunch of PVC embedded in your face. That would suck.
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Unread postAuthor: battlelava » Fri Oct 28, 2011 7:58 pm

12oz soda can with cement at supersonic speed, sounds overpowered like the real flak gun :D but if it was hybrid it would need a metal barrel which couldd cost a ton
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Unread postAuthor: Goats spudz » Fri Oct 28, 2011 8:09 pm

a hybrid is basically a high pressure burst disc combustion but instead of igniting the fuel in air it ignites in compressed air in various mixes :D
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Unread postAuthor: battlelava » Fri Oct 28, 2011 8:12 pm

Hybrid sounds like much more fun but at a much higher cost unless the barrel can be a low cost metal or thick PVC
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Unread postAuthor: Gun Freak » Fri Oct 28, 2011 8:15 pm

I think you could make it much more realistic if you go pneumatic. Combustion might work too. :wink:
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Unread postAuthor: battlelava » Fri Oct 28, 2011 8:21 pm

As of right now itwill be combustion unless I find cheap hybrid parts rough sketch coming in a half hour
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Unread postAuthor: Goats spudz » Fri Oct 28, 2011 8:21 pm

battlelava wrote:Hybrid sounds like much more fun but at a much higher cost unless the barrel can be a low cost metal or thick PVC
i think you could get a pressure rated pvc pipe like 300psi or something and slap on about 1 inch of fiberglass?
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Unread postAuthor: battlelava » Fri Oct 28, 2011 11:33 pm

Here's my rough sketch, very hard to see because my scanner doesn't want to work for me.(my new first target)
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just gotta figure out how i can get a recoil system in there and then I can start mapping out sizes, and begin making this beast.
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Unread postAuthor: wyz2285 » Sat Oct 29, 2011 4:33 am

That hybrid I mentioned uses a abs barrel :roll:
Hybrid or combustion will make a much more realistic shot that a pneumatic (Hybrid sounds better than a combustion :twisted: ) and it´s not expensive, with a 10x hybrid you don´t need a large chamber, if you buy iron fittings that won´t cost you more than 30$, than you can use pvc to better the look :)
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Unread postAuthor: battlelava » Sat Oct 29, 2011 11:02 am

If I fitted a 3" sch 80 pipe with fiberglass cloth and surrounded that with a EMT (electric metal tube) pipe would that be strong enough for a barrel, as I can only find 2" galvanized pipe as of right now, and soda cans require a 3". I know combustion use a 1:(.08-1.5) ratio but what would a hybrid require, if its less it might suit this better instead of hiding a huge combustion chamber.
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Unread postAuthor: wyz2285 » Sat Oct 29, 2011 11:27 am

I don't know the ratio of a hybrid, as it depends the mix, but in principle it requires less chamber volume than a combustion with the same power
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