well, just what the title says.
I would probably want to build someething very similar to this- [url>http://www.spudfiles.com/forums/the-lie ... 14345.html[/url]
It would most likely be 3-4x (5x?) mix maximum. I realize this requires no welding, soldering, etc. since all the parts are threaded, which i like. Anyway, I was wondering, what is the best (reasonably priced) ignition source, and what is the best thing to use as a propane reg.
Thanks, Fish
time to man up & make a hybrid...
-
Davidvaini
- Sergeant 4
- Posts: 1315
- Joined: Tue May 29, 2007 8:58 pm
http://www.spudfiles.com/forums/the-lie ... 14345.html
wierd its adding a space between the h and the t in html...
wierd its adding a space between the h and the t in html...
1. Assuming you're staying at low mixes for now, a stungun or a flash cap. discharged through an ignition coil works well. If you want much higher mixes, a burning-wire type of system is more practical (although that's not to say that you shouldn't build a huge-ass, 500kV Marx generator instead 
)
2. You don't need a propane reg. The simplest solution is to take a torch, unscrew the curved brass pipe from the valve body, and then use a 1/4" compression adapter to connect it to NPT fittings.
3. Unless you want to build only one hybrid ever, consider using a manometric rather than a volumetric meter. I use one meter, with no adjustments, for everything from low-mix handheld hybrids, to a 3000fps airsoft gun, to the monster sitting in my shed right now that I haven't posted yet. All in all, manometric metering is the way to go for hybrids. I can guarantee that you won't regret the slightly higher startup cost it entails.
)2. You don't need a propane reg. The simplest solution is to take a torch, unscrew the curved brass pipe from the valve body, and then use a 1/4" compression adapter to connect it to NPT fittings.
3. Unless you want to build only one hybrid ever, consider using a manometric rather than a volumetric meter. I use one meter, with no adjustments, for everything from low-mix handheld hybrids, to a 3000fps airsoft gun, to the monster sitting in my shed right now that I haven't posted yet. All in all, manometric metering is the way to go for hybrids. I can guarantee that you won't regret the slightly higher startup cost it entails.
Spudfiles' resident expert on all things that sail through the air at improbable speeds, trailing an incandescent wake of ionized air, dissociated polymers and metal oxides.
-
frankrede
- Sergeant Major 2
- Posts: 3220
- Joined: Thu Jul 20, 2006 9:47 pm
- Has thanked: 1 time
- Been thanked: 1 time
Whats manometric metering?DYI wrote:1. Assuming you're staying at low mixes for now, a stungun or a flash cap. discharged through an ignition coil works well. If you want much higher mixes, a burning-wire type of system is more practical (although that's not to say that you shouldn't build a huge-ass, 500kV Marx generator instead
2. You don't need a propane reg. The simplest solution is to take a torch, unscrew the curved brass pipe from the valve body, and then use a 1/4" compression adapter to connect it to NPT fittings.
3. Unless you want to build only one hybrid ever, consider using a manometric rather than a volumetric meter. I use one meter, with no adjustments, for everything from low-mix handheld hybrids, to a 3000fps airsoft gun, to the monster sitting in my shed right now that I haven't posted yet. All in all, manometric metering is the way to go for hybrids. I can guarantee that you won't regret the slightly higher startup cost it entails.
Current project: Afghanistan deployment
Measuring the chamber pressure directly rather than using a fuel meter like most combustions and all but the most recent hybrids (so far, I believe that me, Spudfarm, and Larda are the only ones to build manometric meters for hybrids).Whats manometric metering?
Spudfiles' resident expert on all things that sail through the air at improbable speeds, trailing an incandescent wake of ionized air, dissociated polymers and metal oxides.
-
frankrede
- Sergeant Major 2
- Posts: 3220
- Joined: Thu Jul 20, 2006 9:47 pm
- Has thanked: 1 time
- Been thanked: 1 time
Interesting, tell me more, how do you do it?DYI wrote:Measuring the chamber pressure directly rather than using a fuel meter like most combustions and all but the most recent hybrids (so far, I believe that me, Spudfarm, and Larda are the only ones to build manometric meters for hybrids).Whats manometric metering?
Current project: Afghanistan deployment
-
SpudFarm
- First Sergeant 3
- Posts: 2571
- Joined: Sat Nov 04, 2006 9:39 am
- Location: Norway Trondheim area
since this is one of the topics i am PM'ing with fishboy about it is also one of the few i am watching if i can help on so i throw in a post.
it is simple, you have a 0-1bar pressure gauge and a air gauge. then you multiplies 0.045 by your mix number to find the amount of propane needed.
that would be for a 7x mix: 0.045*7=0.315 bar of propane and 6 bar of air.
just change the 7 in 0.045*7 to another mix number to find the pressure for another mix.
camera capacitor dumped into a ignition coil should work fine on 20x with a small gap (i would have used it up to 30x if i have made a cannon for it)
well, other members can take care of the questions raised from my post.
it is simple, you have a 0-1bar pressure gauge and a air gauge. then you multiplies 0.045 by your mix number to find the amount of propane needed.
that would be for a 7x mix: 0.045*7=0.315 bar of propane and 6 bar of air.
just change the 7 in 0.045*7 to another mix number to find the pressure for another mix.
camera capacitor dumped into a ignition coil should work fine on 20x with a small gap (i would have used it up to 30x if i have made a cannon for it)
well, other members can take care of the questions raised from my post.
"Made in France"
- A spud gun insurance.
- A spud gun insurance.
I used to use my hybrid at 6x and 7x with just a simple BBQ igniter. One wire from it is attached to the chamber wall (steel) and one is put through a schrader valve spark plug. The gap is less than 1/16" but works fine.
I'm setting it up again, and I've got a question for you guys. How bad is a thin layer of rust on the inside of the chamber? It's thin enough to flake off and see normal steel underneath, but I'd rather not take too many chances.
I'm setting it up again, and I've got a question for you guys. How bad is a thin layer of rust on the inside of the chamber? It's thin enough to flake off and see normal steel underneath, but I'd rather not take too many chances.