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Coaxial piston hybrid rifle idea.

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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Coaxial piston hybrid rifle idea.

Unread postAuthor: tigerblues28 » Sat Dec 21, 2013 4:46 pm

This idea sparked (pun intended) into my head the other night, and I wanted to see what others thought about it, what could be done to help it, and to make sure its not a ticking time bomb I'm thinking of, instead of a high powered rifle.

Chamber; 6" of 3/4" Stainless steel pipe nipple, with end cap and 3/4" to 1/2" threaded reducer.
Piston; an airtight piston made by a fellow Spud files member.
Barrel; 1/2" threaded muzzle loader barrel or something similar.
Spark; I've had good luck with grill lighter spark igniters.
Fueling; propane and a stirrup pump, using the ball valves and a pressure gauge for measuring.
Mix; anywhere from 4x to 15x.

Id want to use it in a handheld, rifle style, with optics. I think it would be sweet to hit a target from a couple hundred yards away with a rifle, also looking for sick power.

https://docs.google.com/drawings/d/1Vr0 ... sp=sharing

I hope people can check it out. Its pretty simple.
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Re: Coaxial piston hybrid rifle idea.

Unread postAuthor: jackssmirkingrevenge » Mon Dec 23, 2013 7:08 am

A pop-off valve in the pilot area would allow the piston to open faster, otherwise performance is going to be limited.
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