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first combustion

Built a combustion cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Unread postAuthor: Cosmo » Fri Jan 19, 2007 6:51 pm

sweet gun but u should give it a paint job
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Unread postAuthor: Walsh_3rdE » Sat Jan 20, 2007 9:18 pm

nice cannon but y do you talk like borat ? " im 16 - you look "
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Unread postAuthor: killagorrila99 » Sat Jan 20, 2007 9:23 pm

"Yek she mash! Hello my name a borat, I mary pamela's enderson"
Sounds nothing like what he said. Nice gun. Very.
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Unread postAuthor: Alabaster » Fri Jul 27, 2007 11:21 am

hey i thought hybrids werent supposed tho use sch 40
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Unread postAuthor: dauphinoise potato » Fri Jul 27, 2007 11:27 am

That is a really nice cannon awesome first cannon.And by the way alablaster it's a combustion not hybrid.
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Unread postAuthor: Alabaster » Fri Jul 27, 2007 11:31 am

my bad i thought i saw a propane tank
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Unread postAuthor: dauphinoise potato » Fri Jul 27, 2007 1:48 pm

Yeah you saw rightly that is a propane tank. The cannon has direct propane injection.
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Unread postAuthor: Alabaster » Fri Jul 27, 2007 1:51 pm

Wow :shock: shounds kinda gutsy to me
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Unread postAuthor: paaiyan » Fri Jul 27, 2007 2:05 pm

No, people do it all the time. You inject the amount of propane that is stoichiometrically equivalent to the amount of oxygen in the air so the combustion is as efficient as possible. If you look at some of the better cannons on here. you'll see that a lot of people do it.
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Unread postAuthor: Alabaster » Fri Jul 27, 2007 2:07 pm

Then whats the differens between this and a hybrid
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Unread postAuthor: dauphinoise potato » Fri Jul 27, 2007 2:46 pm

A hybrid has a compressed mixture of the fuel and air in the chamber that is keeping within the 4.2percent propane to air ratio held back by a burst disk. When the mixture is ignited the burst disk ruptures.
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Unread postAuthor: SpudBlaster15 » Fri Jul 27, 2007 2:48 pm

We really need an emoticon that depicts the action of smashing one's head on a wall repeatedly.

A hybrid uses a compressed air/fuel mixture.
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Unread postAuthor: Alabaster » Fri Jul 27, 2007 2:49 pm

hey hey man i love.
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Unread postAuthor: Pilgrimman » Fri Jul 27, 2007 2:56 pm

Hybrids depend on stoichiometric ratios that allow the propane to combust, just like combustions. The difference is, they store propane and air in stoichiometric proportions, but the pressure is higher. It's like having two or more shots of combustion fuel and air in one chamber. The reason this is used is that the gas particles gain more energy from this mix, and are therefore less limited by the sound barrier. Pneumatics are fundamentally limited by the energy of the gas particles, and since air is relatively heavy, the ability of the particles to move fast is hindered.

To all hybrid builders: Correct my post if it's wrong. I'm just trying to get the general idea across.
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Unread postAuthor: Alabaster » Fri Jul 27, 2007 2:58 pm

and thank you for trying pilgram. unlike some people
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