----- Original Message -----
From: "Andrew Case" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, May 12, 2004 11:43 AM
Subject: Re: [ERPS] Re: New Igniter Project Update
> If I was starting
> from scratch I'd spec nitrous oxide/Isopropanol, 150 psi feed pressure,
> and a mix ratio that keeps the temperature low enough to use
> radiatively cooled stainless chambers. Performance would suck, but it
> would be cheap and simple enough to actually get something done.
I'd have to weigh that against ethane/ethylene with nitrous -- not much
heavier tank than pressure fed isopropanol (especially if you need a
separate pressurant tank rather than, say, using a bleed off the nitrous and
a piston or bladder for isolation), self pressurizing to the same
approximate level as the nitrous, and you could use automotive components
made for nitrous service for both components (with much more than 150 psi
chamber pressure, if so desired). Igniter? Try a spark plug and "buzzer"
coil (a la Model T). Ethane is harder to get than isopropanol, and ethylene
more so, but neither is that exotic and high purity isn't necessary -- some
methane or butane in your ethane won't hurt anything, as long as the vapor
pressure curve is right.
--
I may be a scwewy wabbit, but I'm not going to Alcatwaz!
-- E. J. Fudd, 1954
Donald Qualls, aka The Silent Observer
Lathe Building Pages http://silent1.home.netcom.com/HomebuiltLathe.htm
Speedway 7x12 Lathe Pages http://silent1.home.netcom.com/my7x12.htm
Opinions expressed are my own -- take them for what they're worth
and don't expect them to be perfect.
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