Search found 113 matches

by GalFisk
Wed Jul 04, 2012 4:11 am
Forum: Combustion Cannons
Topic: Gas Phase Detonation Literature
Replies: 1
Views: 634

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
by GalFisk
Mon Jun 21, 2010 3:29 pm
Forum: Ammo & Parts
Topic: Combined floating o-ring and one-way valve
Replies: 3
Views: 1324

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! :)
by GalFisk
Mon Jun 21, 2010 2:21 pm
Forum: Ammo & Parts
Topic: Combined floating o-ring and one-way valve
Replies: 3
Views: 1324

Combined floating o-ring and one-way valve

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,...
by GalFisk
Wed Jun 16, 2010 6:13 pm
Forum: General How-To & Discussion
Topic: mistakes in spud gunning
Replies: 113
Views: 8983

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...
by GalFisk
Wed Jun 16, 2010 6:13 pm
Forum: General How-To & Discussion
Topic: mistakes in spud gunning
Replies: 113
Views: 8983

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...
by GalFisk
Wed Jun 16, 2010 10:23 am
Forum: Hybrid Cannons
Topic: Piston Design
Replies: 24
Views: 3059

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...
by GalFisk
Wed Jun 16, 2010 10:09 am
Forum: Combustion Cannons
Topic: Gatling #1
Replies: 124
Views: 51169

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...
by GalFisk
Wed Jun 16, 2010 9:01 am
Forum: Pneumatic Cannons
Topic: semi design
Replies: 17
Views: 1787

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...
by GalFisk
Tue Sep 22, 2009 4:49 am
Forum: Hybrid Cannons
Topic: Cobra Striker
Replies: 36
Views: 14844

Aha, so that's how the valve works. I couldn't figure it out exactly from the description in the contest post. Nifty!
by GalFisk
Mon Sep 21, 2009 6:20 am
Forum: Ammo & Parts
Topic: interference sleeving a barrel....
Replies: 30
Views: 2051

Just a thought: would moisture frozen to the outside of the copper tube interfere with the sleeving?
by GalFisk
Mon Sep 21, 2009 6:05 am
Forum: Hybrid Cannons
Topic: Hybrid Ranting.....
Replies: 28
Views: 1731

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...
by GalFisk
Mon Aug 31, 2009 9:52 am
Forum: Hybrid Cannons
Topic: Hybrid cartridge material
Replies: 30
Views: 3347

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 ...
by GalFisk
Fri Aug 21, 2009 4:44 am
Forum: Combustion Cannons
Topic: Chamber Venting with compressed air.
Replies: 38
Views: 2549

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...
by GalFisk
Wed Aug 19, 2009 4:10 am
Forum: Combustion Cannons
Topic: Chamber Venting with compressed air.
Replies: 38
Views: 2549

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...