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interesting motar-type design

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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interesting motar-type design

Unread postAuthor: FishBoy » Sun Nov 16, 2008 1:29 pm

Just found this & I thought it was pretty cool, anyone got any ideas on how it might work?

[youtube]http://www.youtube.com/watch?v=rBJwiwfqg70&feature=related[/youtube]
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Unread postAuthor: Demon » Sun Nov 16, 2008 1:54 pm

I dont know at all, but it doesn't looks very powerful...

There is an white cylinder between the chamber and the barrel, maybe a valve?At 0:20
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Unread postAuthor: jor2daje » Sun Nov 16, 2008 4:42 pm

I have seen one of these before i think it uses vaporized gasoline with compressed air as a propellant. Im not sure but it might be on instructables.
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Unread postAuthor: MrCrowley » Sun Nov 16, 2008 5:34 pm

Look at his other videos, there's something on the side:
http://youtube.com/user/Rai41478
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Unread postAuthor: newbmatic » Sun Nov 16, 2008 5:54 pm

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Unread postAuthor: starman » Sun Nov 16, 2008 6:51 pm

This actually looks like a gasoline "hybrid", believe it or not using a soda bottle as it's chamber and "propulsion rocket".

For all the effort and gizmos inside that thing, it appears to be greatly inefficient.
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Unread postAuthor: jor2daje » Sun Nov 16, 2008 8:05 pm

Yeah it sorta looks like it uses the friction of the soda bottle and the pipe to make a sort of ish burst disk/chamber combo.
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Unread postAuthor: Lentamentalisk » Sun Nov 16, 2008 8:29 pm

If I were to do this, I would use the bottle as a burst disk, and screw it on, rather than just friction fit. Just fill it up to a 5x mix, and ignite it. That would get you actual range, as opposed to theirs, which is just a badly designed bottle rocket.
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