The Gas Explosion handbook has a chapter on detionation, as well as lots of useful info on deflagration type explosions: http://www.gexcon.com//handbook/GEXHBcontents.htm

Nice, yes it would be ideal for a pump as well, thanks for the tip. I'm getting into spudgunning again after a hiatus of several years. Too bad there's no good way of summarizing the advancements done in the meantime!

I came up with this when renovating my long-ignored airsoft semi. By cutting grooves in one of the edges that seal against a floating o-ring (described here ), I'm allowing the air escape around the o-ring in one direction. When the pressure is reversed, the o-ring seals perfectly against the other,...

I remember many years ago, I was trying to include a chamber fan in the design of my coke bottle combustion. I cut a bottle in half, installed a small fan at the bottom, and glued it together with superglue. I thought I'd test it to see if it could hold the pressure of a jammed round, so I screwed a...

I remember many years ago, I was trying to include a chamber fan in the design of my coke bottle combustion. I cut a bottle in half, installed a small fan at the bottom, and glued it together with superglue. I thought I'd test it to see if it could hold the pressure of a jammed round, so I screwed a...

It wouldn't require too much work to modify this design into a self-venting valve. My copper hybrid (not finished, and therefore not showcased yet) uses one: at the back of the pilot chamber is a tube with vent holes drilled through the side. Inside the tube is a small piston connected to the main p...

the real problème with an upgraded rate is: - the speed of rotation not in accordance with the front of flamme, and the front of flamme while the explosion is coming in contact with the admission ... not so easy too explain sorry. I'll start by saying, like the others, that this is one damn impress...

Is the black square the regulator? I think it will work as long as the pilot side pressurizes first except for the ammo loading part. I think the clip needs to be blocked when the piston is back, not when it is forward. That is how my airsoft semi (piston rebuilt yesterday) works - the loading mech...

http://www.carbidbus.nl/Carbid1/Carbids ... favou.html

Aha, so that's how the valve works. I couldn't figure it out exactly from the description in the contest post. Nifty!

Just a thought: would moisture frozen to the outside of the copper tube interfere with the sleeving?

I guess the valve is the main reason why hybrids are named the way they are. From that perspective, a good hybrid must have a valve that opens as the chamber reaches peak pressure. The actual combustion is just a very fast way of reaching high pressure (the temperature also helps). I agree - the pr...

This last design looks promising to me, I like the washer spark gap. I second using oxygen if possible, to get more power out of the limited volume. I think it will be sufficient, maybe even better, to thread the inside of the chamber where the epoxy sits rather than drilling holes in it. And since ...

This will mean even less air and less power for subsequent shots, until there's not enough air left to sustain the cycle. No, the gas from cycle 2 will also draw in 90% of the chamber volume, too. then all the gas would be heated, contract to 10% and so on until the chamber heated up to the point w...

The thing is, pulling a vacuum is not enough because we need to fill the entire chamber with fresh air for s sustainable cycle. If we have hot exhaust gasses that contract to 10% of their original volume, only 90% of the chamber will fill with fresh air and the next shot will only be at 90% power. T...