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Need advice on my hybrid sniper rifle setup

Post questions and info about hybrid (compressed gas with fuel) powered cannons here. This includes discussion about fuels, ratios, ignition systems, build types, safety, and anything else relevant.
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Need advice on my hybrid sniper rifle setup

Unread postAuthor: CPF » Mon Apr 11, 2011 7:00 pm

[youtube]http://www.youtube.com/watch?v=HpPXr5dUM7Q[/youtube]

hello spudfiles any advice or solutions would be greatly appreciated. Ive looked everywhere and couldnt find what i needed so i decided to post a video and see if anybody could help.

The main issue is the trigger mechanism. Whats the best way to generate a spark inside a 1in chamber that works with 10x plus pressures. also is there a way to seal up a leak in the union piece, it only leaks when i reach around 120psi.
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Unread postAuthor: mark.f » Mon Apr 11, 2011 9:07 pm

I think you would have a very difficult time making an inline solution to a piston valve in that union to replace the burst disk. Have a look at Fnord, MrCrowley, and SpudBlaster15's examples in the hybrid showcase for something that will work and is much simpler to accomplish with limited tooling.

As to the ignition, just tapping screws into the metal chamber won't work because the chamber will conduct the current from your igniter instead of it jumping your spark gap. You need to have at least one electrode insulated from the chamber.

EDIT: english.
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Unread postAuthor: CPF » Mon Apr 11, 2011 9:19 pm

mark.f wrote:I think you would have a very difficult time making an inline solution to a piston valve in that union to replace the burst disk. Have a look at Fnord, MrCrowley, and SpudBlaster15's examples in the hybrid showcase for something that will work and is much simpler to accomplish with limited tooling.

As to the ignition, just tapping screws into the metal chamber won't work because the chamber will conduct the current from your igniter instead of it jumping your spark gap. You need to have at least one electrode insulated from the chamber.

EDIT: english.


Thanks for the response.
How can i insulate the electrode?
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Unread postAuthor: mark.f » Mon Apr 11, 2011 9:25 pm

Easiest way if you have the correct drill bit and tap is to use a spark plug, but if you're like the rest of us, this works well.
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Unread postAuthor: Crna Legija » Mon Apr 11, 2011 10:53 pm

For a spark gap, i would go out buy 1/8'' npt tap and the drill bit required. and a NGK CR10EK spark plug just drill tap he end cap or though both the 90* and pipe. then connect your stungun to it.


as for the union, you might have to grind/lathe down the lips in the union.
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Unread postAuthor: CPF » Mon Apr 11, 2011 11:10 pm

Crna Legija wrote:For a spark gap, i would go out buy 1/8'' npt tap and the drill bit required. and a NGK CR10EK spark plug just drill tap he end cap or though both the 90* and pipe. then connect your stungun to it.


as for the union, you might have to grind/lathe down the lips in the union.


yea somebody just told me the same thing. Im probaly going to tap the cap piece and put the spark plug there. thanks for the post :)
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Unread postAuthor: warhead052 » Tue Apr 12, 2011 10:19 am

First clean your room, or do the video outside in the sun light. Spark plugs would work, you could always use a.... Ahh whats it called? I cant remember the name, but when I do I will let you know.
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