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| frankrede |
 Posted: 12/12/2007 23:23 PM Post subject: |
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Sangheili
Joined: 20 Jul 2006
Posts: 2987
524.82 Spud Bux
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| aaron1225 wrote: | | you should grind down those corners | I should not.
The flat edge holds it straight and works as a base. |
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| TwitchTheAussie |
| Posted: 12/13/2007 0:37 AM Post subject: |
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Brigadier General
Joined: 06 Feb 2007
Posts: 931
1003.70 Spud Bux
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| Just to be safe I'd MIG weld everything. Just to be safe. Other than that use a remote detonator and be careful with the spark plugs. |
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| DYI |
| Posted: 12/13/2007 16:23 PM Post subject: |
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Rear Brigadier
Joined: 07 Jul 2007
Posts: 2261
1002.18 Spud Bux
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Did you read the entire topic Twitch? 
The whole thing is MIG welded.
And what mixes do you plan on taking it to frank? It looks like it could take 20x easily. |
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| frankrede |
| Posted: 12/13/2007 22:17 PM Post subject: |
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Sangheili
Joined: 20 Jul 2006
Posts: 2987
524.82 Spud Bux
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Thats exactly what I have in mind.
Or atleast to the highest mix I can take it too with my air compressor |
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| DYI |
| Posted: 12/13/2007 22:46 PM Post subject: |
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Rear Brigadier
Joined: 07 Jul 2007
Posts: 2261
1002.18 Spud Bux
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| With everything accounted for, assuming excellent fueling techniques, 20x would be about 290 psi preignition. That must be one impressive compressor. If you have a normal compressor however, you could pressurise a tank with a homemade high pressure pump for the air source. Either that, or a regged HPA tank, but I think the first option would be cheaper. |
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| frankrede |
| Posted: 12/13/2007 22:52 PM Post subject: |
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Sangheili
Joined: 20 Jul 2006
Posts: 2987
524.82 Spud Bux
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| DYI wrote: | | With everything accounted for, assuming excellent fueling techniques, 20x would be about 290 psi preignition. That must be one impressive compressor. If you have a normal compressor however, you could pressurise a tank with a homemade high pressure pump for the air source. Either that, or a regged HPA tank, but I think the first option would be cheaper. | Yea. I knew it was something crazy. I would figure something out. |
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| SpudBlaster15 |
| Posted: 12/16/2007 1:37 AM Post subject: |
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Human blast shield
Joined: 18 Oct 2006
Posts: 1539
11.03 Spud Bux
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Questions:
1. How thick are the walls of the pipe you used?
2. What is the diameter of the pipe you used?
3. What grade of steel is the pipe? |
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| Novacastrian |
| Posted: 12/16/2007 5:19 AM Post subject: |
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Bloody Aussie
Joined: 11 Aug 2007
Posts: 1622
116.11 Spud Bux
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| DYI wrote: | | With everything accounted for, assuming excellent fueling techniques, 20x would be about 290 psi preignition. That must be one impressive compressor. If you have a normal compressor however, you could pressurise a tank with a homemade high pressure pump for the air source. Either that, or a regged HPA tank, but I think the first option would be cheaper. |
Ok, i know that propane CAN start to turn liquid at around 90psi, having said that i have fueled my mini hybrid to 90psi with no troubles.
My question is this- at 290psi what is the chance of non-liquification?
Btw, great idea with the pre-pressurised tank DYI, i was looking for a simple way to pressurise hybrids in the field. |
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| spanerman |
| Posted: 12/16/2007 8:42 AM Post subject: |
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Lieutenant Colonel
Joined: 17 Sep 2006
Posts: 447
296.08 Spud Bux
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| would keeping the chamber warm or cold, can never remember reduce the chances of liquification? |
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| DYI |
| Posted: 12/16/2007 9:35 AM Post subject: |
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Rear Brigadier
Joined: 07 Jul 2007
Posts: 2261
1002.18 Spud Bux
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| Due to the low propane:air ratio, I'm pretty sure that partial pressure would stop the propane from liquifying at any easily achievable mix. I don't know for sure though. I do know that a 20x mix would be really impressive. |
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| markfh11q |
| Posted: 12/16/2007 9:41 AM Post subject: |
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Magic Dust Man
Joined: 06 May 2006
Posts: 1452
459.76 Spud Bux
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| Some say that because of partial pressures, the propane will not liquefy in a propane:air mixture past 90 PSIG. They say it will take around 2,143 PSIG to liquefy it in a 4.2% mix. Don't know that for a fact, though. |
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| DYI |
| Posted: 12/16/2007 10:08 AM Post subject: |
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Rear Brigadier
Joined: 07 Jul 2007
Posts: 2261
1002.18 Spud Bux
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Assuming that the pressure in a propane tank is around 110 psig, the limit imposed by that is a 183x mix, which would equate to ~2790 psig.
If we also assume that the partial pressure argument is correct (which I suspect it is, due to _Fnord's 11x tests), then it seems as though about 141x is the limit. I wonder what kind of pressure a 100x mix would generate? |
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| spanerman |
| Posted: 12/16/2007 10:12 AM Post subject: |
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Lieutenant Colonel
Joined: 17 Sep 2006
Posts: 447
296.08 Spud Bux
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more than id want to be within a mile of  |
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| DYI |
| Posted: 12/16/2007 10:15 AM Post subject: |
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Rear Brigadier
Joined: 07 Jul 2007
Posts: 2261
1002.18 Spud Bux
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| I'm guessing over 10kpsi in adiabatic conditions. Dammit, now you've got me wanting to build a 20x oxy/MAPP hybrid... |
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| spanerman |
| Posted: 12/16/2007 11:02 AM Post subject: |
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Lieutenant Colonel
Joined: 17 Sep 2006
Posts: 447
296.08 Spud Bux
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^thank god your on a different continent to me  |
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