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| noname |
 Posted: 09/15/2006 22:21 PM Post subject: Mini Hybrid |
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Mr Vortex
Joined: 10 Apr 2006
Posts: 2518
2726.97 Spud Bux
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I'm going to make a really frickin small hybrid. Just a 3/4" or 1/2" SCH 80 nipple, a galvanized reducer to 1/8" Schrader, and a 1/2" or 3/4" union with a BB barrel on the other end. Probably just a BBQ igniter for the ignition.
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| frankrede |
| Posted: 09/15/2006 22:50 PM Post subject: |
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Sangheili
Joined: 20 Jul 2006
Posts: 2987
524.82 Spud Bux
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Good luck.
So your filling the propane and air from the shrader?
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| noname |
| Posted: 09/15/2006 23:04 PM Post subject: |
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Mr Vortex
Joined: 10 Apr 2006
Posts: 2518
2726.97 Spud Bux
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Yep. Might be able to break 4x or maybe 5x.  Small Sch 80 pipe can hold A LOT of pressure, and steel is just not going to blow up no matter what you do to it.
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| drac |
| Posted: 09/16/2006 11:34 AM Post subject: |
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Metalhead Moderator
Joined: 24 Apr 2005
Posts: 894
5173.40 Spud Bux
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| Good luck getting the correct mix. Small chamber like that are a [female doggy] to fuel.
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| noname |
| Posted: 09/16/2006 13:27 PM Post subject: |
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Mr Vortex
Joined: 10 Apr 2006
Posts: 2518
2726.97 Spud Bux
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| The propane meter is prbably going to be a nipple between a blowgun and a tire chuck.
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| SpudStuff |
| Posted: 09/16/2006 13:34 PM Post subject: |
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Major General
Joined: 10 Dec 2005
Posts: 1379
128.17 Spud Bux
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| that is gonna be a lot of propane like 2x or 3x
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| Pete Zaria |
| Posted: 09/16/2006 14:15 PM Post subject: |
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Resident Computer Guru
Joined: 31 Mar 2006
Posts: 961
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How do you intend to pass the BBQ sparker wires into the chamber? The chamber conducts, so you can't use screws or something like that...
I'm working on a large-scale metal hybrid. For my ignition system, I pass the wires into the chamber through a quarter-inch bushing, with the space around the wires filled with JBweld. I use well-insulated wires connecting to a spark strip. You could build a mini spark strip and do something similar. Just put a T on the back with the schrader on one end and the ignition wires coming in the other.
By the way, with hybrids, smaller spark gaps work better. I'm talking teeny, 1/32" or so. A BBQ sparker might not be the best for this. Consider a camera flash (easy to build).
Peace,
Pete Zaria.
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| noname |
| Posted: 09/16/2006 14:21 PM Post subject: |
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Mr Vortex
Joined: 10 Apr 2006
Posts: 2518
2726.97 Spud Bux
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| There is going to be like 3/8" of exposed sch 80 in which I'll put two little screws like on this gun.
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| Pete Zaria |
| Posted: 09/16/2006 14:28 PM Post subject: |
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Resident Computer Guru
Joined: 31 Mar 2006
Posts: 961
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Exposed sch 80 what? PVC or metal? You can't put screws for an ignition system through metal; the metal chamber will conduct (shorting the circuit) and you won't get a spark. If you're going to have exposed PVC that's taking pressure, then that will be the weak point of the gun...
Peace,
Pete Zaria.
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| ProfessorAmadeus |
| Posted: 09/16/2006 14:38 PM Post subject: |
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Running with Scissors
Joined: 28 Apr 2006
Posts: 1046
280.78 Spud Bux
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| I think he meens PVC. This is gonna be cool.
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| Pete Zaria |
| Posted: 09/16/2006 14:43 PM Post subject: |
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Resident Computer Guru
Joined: 31 Mar 2006
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My mistake, guys. I confused this with another thread and thought he was making the chamber out of metal. My apologies for the confusion.
Peace,
Pete Zaria.
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| ProfessorAmadeus |
| Posted: 09/16/2006 14:50 PM Post subject: |
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Running with Scissors
Joined: 28 Apr 2006
Posts: 1046
280.78 Spud Bux
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| Well im not sure, you may be right. Well i guess we will have to wait for him to reply.
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| jrrdw |
| Posted: 09/16/2006 16:48 PM Post subject: |
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Donating Moderator
Joined: 16 Nov 2005
Posts: 3184
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| What do you use to cement metal to pvc? That is why i changed my plans on the chambers i'm useing. A clue on this would be really cool.
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| ProfessorAmadeus |
| Posted: 09/16/2006 17:09 PM Post subject: |
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Running with Scissors
Joined: 28 Apr 2006
Posts: 1046
280.78 Spud Bux
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| I think that you have to tread them together. Thats how people attach ball valves to simple pnuematics. I would also when treading it i would put epoxy on it.
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| noname |
| Posted: 09/16/2006 17:44 PM Post subject: |
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Mr Vortex
Joined: 10 Apr 2006
Posts: 2518
2726.97 Spud Bux
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| It's going to be a Sch 80 PVC nipple that's threaded on both ends. And thanks Professor, I might put JB Weld or something on the threads and screw them together fast or hook them up to a drill to spin them together before the epoxy dries.
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