I use a CO2 cilinder ( rated to over a 1000 Psi) as the chamber.
The ignition is a FIRST EVER percussion cap-striking pin!!
Normally used on blackpowder rifles.
I converted a strange inverted hammer valve( hit to close) into a persussion pin.
I have some percussion caps ( soon switch to the red caps in toy guns) and the ignition works!
The cap litterally detonates inside the Tee, wich is part of the chamber.
The gun is not finished yet, and I haven't yet added the starter-fuel meter.
It is at this stage a simple( well...simple..) combustion, until I get the shrader valve and the burst disk unit in place.
I tried lighter fuel( both spray and gasoline) but ofcourse the mix was too rich.( first time booboo nr 1)
I think the real challenge is getting the mix right in such a small chamber.
On to the pics...
, In the theories section there is a designed special round that ignights gas with a cap from a toy gun. Just recently I designed a concept(drawn in scetch) grenade launcher which uses similar rounds. The difference between yours and mine is mine has no chamber, except the round which is self contained, and yours is a hybrid. Say the chamber on mine is 40mm pvc with a 20mm projectile. It has a breech barrel that is used to take rounds in and out. Each round has the perfect amount of propane in it and should be re-usable. Designed as a non leathal weapon, or airsoft. I don't plan to shoot anyone.
