Spark length at 20x mix


Postby SpudStuff » Thu Oct 26, 2006 9:02 pm

And how would you get it in the chamber?
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Postby benstern » Thu Oct 26, 2006 9:22 pm

Hmmm... good point. The only hole in the cylinder would be the threaded hole for the valve. ~2"
at the pressures I want to reach, welding is out of the question. This basically leaves one option available. Joel's Chambah Chain!
<img src="http://spudtech.com/images/etc/chambahchain.jpg"/>
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Postby SpudStuff » Thu Oct 26, 2006 9:24 pm

Or...
Pennies in the chamber!
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Postby SpudMonster » Thu Oct 26, 2006 11:45 pm

<blockquote id="quote"><font size="1" face="tahoma,verdana,arial" id="quote">quote:<hr height="1" noshade id="quote">Originally posted by SpudStuff
[br]Or...
Pennies in the chamber!
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

Good luck shaking a chamber that big...
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Postby SpudStuff » Thu Oct 26, 2006 11:49 pm

Use steel BBs and a magnet? The chamber is Al right?
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Postby sgort87 » Fri Oct 27, 2006 12:05 am

I really think shaking such a thing, especially by hand, is a bad bad thing.
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Postby SpudStuff » Fri Oct 27, 2006 8:45 am

Throw a bunch of thoes micro fans in all wired together.
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Postby Darth Tater » Fri Oct 27, 2006 4:58 pm

<blockquote id="quote"><font size="1" face="tahoma,verdana,arial" id="quote">quote:<hr height="1" noshade id="quote">Originally posted by SpudStuff
[br]Throw a bunch of thoes micro fans in all wired together.
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

you know, i think he's on to something.

build a small device, that fits into the opening, battery powered, and basically have it "jump around" like those little balls at the toy store that move on their own kinda thing... except this will move more rapidly and have little "fins" on it to help move air...


of course, at a 20x mix, i think there will be enough compressed air going in to mix the fuel/air just fine.
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Postby sgort87 » Fri Oct 27, 2006 5:17 pm

Just wondering, how are you getting this to 280 psi?
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Postby BillyBobJoe » Wed Nov 01, 2006 10:10 pm

<blockquote id="quote"><font size="1" face="tahoma,verdana,arial" id="quote">quote:<hr height="1" noshade id="quote">Originally posted by GalFisk
[br]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>)
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

I've been looking for this type of equation for a long time - Thanks!

But I'm confused as to what the V equals? Voltage in volts or kilovolts? Letts assume volts and I need to find how much of a gap at 7.48 atm (110 PSI) is needed for 7000 volts. So 7000=30(7.48)d+1.35 kv

d= 25.2cm

A 25 cm gap for 7,000 volts at 110 PSI? I don't think so - what am I doing wrong? I know this only works with gaps around 1 mm, but I should be getting a gap around 1 mm.

EDIT - Found this from the original site "Typically, the Townsend mechanism (and by extension Paschen's law) apply at pd products less than 1000 torr cm, or gaps around a centimeter at one atmosphere."

One atmosphere is about 760 torr, so this is pretty much useless? But still, it predicts a 1 cm gap for 1380 volts at one atmosphere. Definitely not right and it's still within the constraints of the equation. 'Effin math . . .
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