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| DYI |
 Posted: 04/17/2008 21:39 PM Post subject: Hybrid1 |
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Rear Brigadier
Joined: 07 Jul 2007
Posts: 2261
1002.18 Spud Bux
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I'm proud to announce that my never-before-tried metering system works - flawlessly. I don't know for sure, but most new hybrids don't fire within 50 ms of the first time you ever press the trigger.
I guess a lot of people wouldn't classify this as "small scale testing", but it's really quite miniscule compared to the second testbed design that will follow.
The specs:
Chamber
Volume: 2584 cc (exactly)
Dimensions: 4.026" x 10", plus 6" or so of 2" pipe leading to the union
Material: Schedule 40 welded steel pipe
Valve
2" burst disk (what else  )
Meter
Made of SCH 40 steel pipe, mostly 1/4". Currently has 6 ports: oxygen, fuel, air, 0-300 psig grade 1A glycerin filled gauge, 0-15 psig grade 1A glycerin filled gauge, and output.
Safeties
Safety ball valves on both oxidiser and fuel inlets, meter can be detached via hydraulic quick connects before firing, 2000psi rated carbon steel ball valve isolating meter and quick connects from chamber, on/off switch on stungun power supply.
I was going to use air for the initial testing, but I accidentally vaporised one of my brass hose barbs with a burning muffin (don't ask  ). The air hose needs 2 barbs to attach to the chamber, and the oxygen hose only needs one. This made the oxidiser decision a very simple one to make.
And because I know how little words mean on the internet, here's the pics and vids:
The whole thing, assembled and ready to fire
Chamber detail. The front plate is 1/2" steel, the back plate is 1.75".
Meter detail. The higher gauge is the 0-15 psig one.
Used burst disks. All 32 layers of aluminum foil.
And the best part of all, the videos. I didn't feel like editing them, so they're shown in their full form, complete with worried parents
http://www.vimeo.com/911462
http://www.vimeo.com/911453
The second one's at night, and shows the muzzle flash quite well. |
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| elitesniper |
| Posted: 04/17/2008 21:43 PM Post subject: |
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Brigadier General
Joined: 13 Oct 2007
Posts: 1002
922.09 Spud Bux
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very, very ,vey nice, good job on the welding too  |
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| willarddaniels |
| Posted: 04/17/2008 21:57 PM Post subject: |
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1st Lieutenant
Joined: 31 Jan 2007
Posts: 280
571.14 Spud Bux
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Sweet, DYI.
I look forward to seeing more of it. |
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| starman |
| Posted: 04/17/2008 22:14 PM Post subject: |
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Big Daddio
Joined: 12 Dec 2007
Posts: 1480
2869.94 Spud Bux
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OH yeah baby!!! Now THAT blast was man's man's blast... even came across on the cam recording...normally wimpy little snap shots get recorded.
 I love your concerned mom coming out there. |
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| XxtriviumxX |
| Posted: 04/17/2008 23:18 PM Post subject: |
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Master Sergeant
Joined: 18 Apr 2007
Posts: 167
305.91 Spud Bux
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Woah that was epic. Nice muzzle flash to.
lol @ your mum comming out. |
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| psycix |
| Posted: 04/18/2008 4:44 AM Post subject: |
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Major General
Joined: 25 Jun 2007
Posts: 1691
110.97 Spud Bux
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Very nice indeed DYI!
The fact that your mom came out tells me that the sound is one hell of a cannon blast! |
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| MrCrowley |
| Posted: 04/18/2008 5:08 AM Post subject: |
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Blizzard of Ozz
Joined: 23 Jun 2006
Posts: 6013
2835.62 Spud Bux
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| Very nice. Nice and big, good stuff |
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| VH_man |
| Posted: 04/18/2008 5:46 AM Post subject: |
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Major General
Joined: 09 Dec 2006
Posts: 1384
2077.27 Spud Bux
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what exaclty is your new metering system?
im constructing a hybrid this summer |
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| Ragnarok |
| Posted: 04/18/2008 6:32 AM Post subject: |
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Lord of Karma
Joined: 19 Dec 2006
Posts: 2233
5838.70 Spud Bux
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| Nice... damn shame about the burning muffin though - because I want a chocolate one now (preferably not burning, but beggars can't be choosers) |
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| VH_man |
| Posted: 04/18/2008 17:32 PM Post subject: |
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Major General
Joined: 09 Dec 2006
Posts: 1384
2077.27 Spud Bux
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i like your mom at the end of the video...
"oh my GOD thats loud!!!" lol. |
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| DYI |
| Posted: 04/18/2008 19:43 PM Post subject: |
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Rear Brigadier
Joined: 07 Jul 2007
Posts: 2261
1002.18 Spud Bux
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My "new" metering system simply measures the chamber pressure. The simplest system, really, but the expensive gauges have deterred others from building it. In my opinion, the shear ease of use and modular capabilities it allows are more than worth the extra $60 or so for high accuracy gauges.
I'm going to try to rebuild the stand I wrecked in the best shot comp and do some damage shots at the range during the week. Although it sounds quiet in the video, it is actually alarmingly loud (even for me) at 3x, loud enough that I'm worried about even my very tolerant neighbours being pissed off by it.
My current meter system allows up to 4x oxy/fuel measured on the 0-15 psig gauge, and up to 20x air/fuel by using both gauges. If I have a sudden moment of bravery, I might try 10x oxy/fuel sometime in the coming week. The use of the 0 - 300 gauge will reduce accuracy, and I don't know if it'll fire. If you don't hear from me again, you'll know what happened |
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| Ragnarok |
| Posted: 04/18/2008 19:58 PM Post subject: |
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Lord of Karma
Joined: 19 Dec 2006
Posts: 2233
5838.70 Spud Bux
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| DYI wrote: | | If you don't hear from me again, you'll know what happened |
Ok, I'll be on the lookout for more earthquake reports then...
(Yes, I know it's the same joke Fnord used earlier, go away.) |
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| bigbob12345 |
| Posted: 04/18/2008 20:01 PM Post subject: |
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Experienced n00b
Joined: 01 Dec 2007
Posts: 1516
370.57 Spud Bux
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Thats just a normal hardware store union rated to 150psi isnt it
Have fun with 10x, esspecially with that union, and that barrel
Well aside from it being one of the most dangerous launchers I have ever seen(this is assuming 10x)its pretty good.
Aint pretty but it sure seems to get the job done |
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| DYI |
| Posted: 04/18/2008 20:24 PM Post subject: |
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Rear Brigadier
Joined: 07 Jul 2007
Posts: 2261
1002.18 Spud Bux
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| Quote: | Thats just a normal hardware store union rated to 150psi isnt it
Have fun with 10x, esspecially with that union, and that barrel
Well aside from it being one of the most dangerous launchers I have ever witnessed(this is assuming 10x)its pretty good.
Aint pretty but it sure seems to get the job done
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Yeah, it's just a normal hardware store union. Keep in mind that the fittings used on _Fnord's 11x test hybrid were all 150 psi rated malleable iron as well. Everything else on the chamber has a burst pressure of over 2000 psi, and a union failure isn't as catastrophic as something like the backplate failing.
And I'll never actually load anything into the barrel at over 3x. It functions mainly as a sound suppressor (although from the videos you can probably tell that it doesn't do a very good job of it). Remember that this is only a prototype to test the concept, it isn't intended as a fully operational launcher. Remote ignition will always be used, reducing the required safety margins. |
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| bigbob12345 |
| Posted: 04/18/2008 20:34 PM Post subject: |
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Experienced n00b
Joined: 01 Dec 2007
Posts: 1516
370.57 Spud Bux
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| DYI wrote: | | Keep in mind that the fittings used on _Fnord's 11x test hybrid were all 150 psi rated malleable iron as well. |
Yes but that doesnt mean that it is safe to do
it survived once, who knows if it will survive the second test
| DYI wrote: | | Remember that this is only a prototype to test the concept |
Practice for [redacted] huh
| DYI wrote: | | Remote ignition will always be used, reducing the required safety margins. |
good gald to hear that |
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