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new hybrid idea

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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new hybrid idea

Unread postAuthor: twizi » Mon Feb 15, 2010 7:53 pm

hey guys i have been think about a simple hybrid and for some reason deisal engines popped in my head so i was think if you had a certian amount of psi in a closed contaner with a burst disc at one end add a 1/2 a teaspoon of dieal fuel and add presure it would go bam right i have heard this work with paintball tanks because idots lube the fill nipple and add presure and there tanks explode

if u have any comments please help

also i sorry if this goes agsint rules it not solid propelent it basicly a hybrid right
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Unread postAuthor: cannon monkey » Mon Feb 15, 2010 8:00 pm

In the diesel engine, only air is introduced into the combustion chamber. The air is then compressed with a compression ratio typically between 15 and 22 resulting into a 40-bar


from this i believe u need around 40 bars to make the dieal to go "bam"


i got this info from wikipedia
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Unread postAuthor: twizi » Mon Feb 15, 2010 8:05 pm

i could get that presure easily
i have a large scuba tank behind me
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Unread postAuthor: tghhs » Mon Feb 15, 2010 8:41 pm

Yeh i like this idea.

Mabe make it just like an engine though instead on having the piston pushed up by the crankshaft (and other pistons going down) have a pressure vessel with 40 bar behind it and a burst disk that bursts pushing the piston forward and igniting.

Thats the only way i think you'd be able to trigger it with an acceptable lock time and taking out the guess work. (So you're not waiting for 10 min till the little fridgy get the pressure up)
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Unread postAuthor: Jeeperforlife » Mon Feb 15, 2010 8:58 pm

I hate burst your bubble but it will not work. Think of a Diesel engine, it has a glow plug to heat the air in the cylinder and it still cranks for a few seconds before it fires the first time when it is cold. It is the very fast compression causing the heat that ignites the fuel not the pressure. You need to compress the fuel air mixture into a smaller volume not just increase the pressure. Unless you were to build a piston that would shoot forward with a huge amount of pressure it would not work, even then the piston would cause a large problem.
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Unread postAuthor: twizi » Mon Feb 15, 2010 9:30 pm

so if i built an aluminom rubber piston it would work
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Unread postAuthor: 245Tommy » Mon Feb 15, 2010 9:45 pm

You could spray some diesel in a spring piston airgun and shoot it...remotely.
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Unread postAuthor: Jeeperforlife » Mon Feb 15, 2010 9:55 pm

twizi wrote:so if i built an aluminum rubber piston it would work


Possibly, But I don’t think you understand the amount of force it takes to compress it fast enough. Besides using stuff we can’t talk about on here a hybrid based ram would do the job but what is the point of that? Plus how are you going to control the piston once it begins to fire?
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Unread postAuthor: Lentamentalisk » Mon Feb 15, 2010 10:29 pm

Ok, so none of you really understand what you are talking about. Dieseling works in spring pellet rifles, though they are not designed for those pressures or temperatures, so it ruins the seals fast. It is completely possible.

The trick is, however, that you must rapidly compress the air, rather then use compressed air. This could be done similar to the way a light gas gun works, with a piston, or it could be done as in springer pellet rifles, with a spring powered plunger.
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