Spark length at 20x mix

[GalFisk]

For air, and gaps on the order of a millimeter, the breakdown is roughly a linear function of the gap length: V = 30pd + 1.35 kV, where d is in centimeters, and p is in atmospheres.
(<a href="http://home.earthlink.net/~jimlux/hv/paschen.htm">source</a>)

[SPG]

Out of interest, won't your propane just liquify well before you get to 20 ATM?

[GalFisk]

The partial pressure of propane must exceed its vapor pressure before it will liquify. At 4.03% by volume and a vapor pressure of 122 psi at 70°F, you can go up to about 122/4.03% = ~3000 psi (204x).

[spuzi14]

I don't know the pressure rating on those tanks but if I was going to anywhere past 1000 PSI I would have a 3000PSI safety margin on the tanks.

I think you can be succesful with this but I think you should triple check everything.

[boilingleadbath]

That applies for water too - right, galfisk?

[benstern]

I was thinking about propane turning to liquid, thanks Galfisk. The main problem is ignition because a fan would not be possible because of the extreme temperature and pressure.

[sgort87]

I think you should shake it by hand to mix it up! :p

[GalFisk]

BLB: correct, that's how air can contain moisture at normal temperatures. Even below freezing water has a vapor pressure, which allows ice to sublimate (see what happens to ice cubes that are kept long in the freezer).

Have fans ever been used in hybrids? Pressure shouldn't affect one much, though temperature could be a problem with high mixes. I was planning to include one and have a wiring for it, but I don't have one small enough.
A metallic fan could work even if a computer fn would melt.

[sgort87]

I used a fan in my hybrid. I don't know if it works anymore or not, but there's a fan in it.

[benstern]

But where would I find a large (8") all metal fan?