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| SpudFarm |
 Posted: 05/08/2008 8:58 AM Post subject: |
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Hybrid Guy
Joined: 04 Nov 2006
Posts: 2049
1076.01 Spud Bux
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i am going to make a camera and a ignition coil setup, but if i talk to Larda he may digg up a flyback or something for me.
or i run like 10camera caps in one ignition coil |
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| psycix |
| Posted: 05/08/2008 16:45 PM Post subject: |
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Major General
Joined: 25 Jun 2007
Posts: 1599
108.44 Spud Bux
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| MrCrowley wrote: | | And I can't remember, but does DDT have a higher chance of occurring at a lower mix then higher? |
IIRC, in the rule you can divide the DDT runup distance on atmospheric pressure by the amount X mix.
If a certain fuel has a runup distance of 100" at atmospheric pressure, then a 2x mix would only need 50", a 3x mix 33, 4x mix 25" and so on.
Im not sure about what I stated above.
Its just a vague memory. |
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| DYI |
| Posted: 05/08/2008 16:59 PM Post subject: |
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Rear Brigadier
Joined: 07 Jul 2007
Posts: 2217
1326.93 Spud Bux
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| Quote: | Im not sure about what I stated above.
Its just a vague memory.
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A vague memory indeed, from way back when people actually thought that 4x was approaching DDT.
In reality, the Nx has very little effect on the DDT runup distance of propane/air mixes. The increased pressure decreases burn rate, and the increased temperature of higher mixes just barely overcomes that effect. A 20x mix might burn a few m/s faster, but not enough to be really worrisome. |
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