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Overkill?

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: magnum9987 » Tue Jun 24, 2008 1:33 pm

well i did originally pick marbles to sim a sniper rifle, hence why the barrel is so long the chamber originally so huge. But i bet no one has had a same diameter gun with equal sized chamber as my original idea.
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Unread postAuthor: MaxuS the 2nd » Tue Jun 24, 2008 1:53 pm

That's because nobody wants to waste a vast amount of the energy produced from their guns.
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Unread postAuthor: magnum9987 » Tue Jun 24, 2008 2:02 pm

UBer long barrel! Does super sonic appeal to anyone?
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Unread postAuthor: bigbob12345 » Tue Jun 24, 2008 2:05 pm

Even if you make the barrel long enough to get a decent ratio flow will still be constricted like crazy. And at 120psi(the limits of pvc) there is no way that it will get supersonic without helium or other lighter gas, there just isnt enough 'push'.
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Unread postAuthor: magnum9987 » Tue Jun 24, 2008 2:06 pm

Dammit! I'll have to use steel or copper.
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Unread postAuthor: bigbob12345 » Tue Jun 24, 2008 2:12 pm

Still a supersonic velocity isnt remotely possible until 400psi without a lighter gas.....Still it wont happen unless you have an extremly light projectile and a massively overkill barrel and chamber.
If you want to go supersonic then just make a hybrid.
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Unread postAuthor: magnum9987 » Tue Jun 24, 2008 2:22 pm

I would rather keep the simplicity of a comby. Big ass chamber, big ass barrel. Hm, I think I'm seeking a record.
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Unread postAuthor: bigbob12345 » Tue Jun 24, 2008 2:32 pm

Your wasting your money, but if you want to do that then I cant stop you.
And please instead of saying things like "comby", just take the time to type out the full word. Combustion, see it isnt so hard.
It took me like two minutes to figure out what you meant by "comby"
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Unread postAuthor: magnum9987 » Tue Jun 24, 2008 2:40 pm

its my own pet name. It is both convenient and it shows my enthusiasm. I'm sure you shorten words to make them smaller. :D
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Unread postAuthor: psycix » Tue Jun 24, 2008 4:49 pm

MaxuS the 2nd wrote:D_Hall's Pipe Dream. ;)

At first I wanted to include that to my post yes. :)

Dammit! I'll have to use steel or copper.

Whats wrong with that?

And did you expect to go supersonic with a gun made out of plastic?

If you really want power (as a result from high pressure) you will have to use metal some day.
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Unread postAuthor: magnum9987 » Tue Jun 24, 2008 4:52 pm

metal is too damn expensive. Besides, doesnt that make the record greater? A feat once thought improbable because of the material?
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Unread postAuthor: psycix » Tue Jun 24, 2008 5:18 pm

The material is simply too weak to hold the pressures needed for supersonic muzzle velocities.
If you still would want to achieve supersonic in pvc, it would require an enormous amount of of it if you are using low pressures, or use a pvc pipe with like 1" thick walls so it can hold those pressures, but then again, it becomes way too expensive, and metal would be a better option.
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Unread postAuthor: magnum9987 » Tue Jun 24, 2008 5:19 pm

Men can dream, can't they
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Unread postAuthor: daxspudder » Tue Jun 24, 2008 6:48 pm

bigbob12345 wrote:Even if you make the barrel long enough to get a decent ratio flow will still be constricted like crazy. And at 120psi(the limits of pvc) there is no way that it will get supersonic without helium or other lighter gas, there just isnt enough 'push'.


I'm pretty sure that says 280psi... OTOH, my sprinkler valve is definitely only rated to 120, but a well built piston gun... well that blows your statement out of the water... :wink:
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Unread postAuthor: MaxuS the 2nd » Tue Jun 24, 2008 6:49 pm

So you're saying that it's possible to achieve the impossible?

You're saying that it's possible to break the speed of sound using plastic pipe, a pressure higher than that of which it was designed to hold, and you don't really know how you're going to do it.
You talking about these ridiculous propositions on an open community does not only jeopardize yourself, but any inexperienced (like yourself) people may pass through and take your word as safe. It's not ok to talk about unsafe ideas on an open forum.

Need I say more?
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