"Tim Ward" wrote in message
ink.net...

"Bill Daniels" wrote in message
...

"Morgans" wrote in message
...

"Bill Daniels" wrote in message
...
Hey, you're gonna have to heat the diesel fuel to keep it from
gelling
so
why not use the fuel as a coolant. If the tanks are of the wet wing
type,
you're almost home free. (I actually had a guy ask me how that
would
cool
the engine if I ran out of fuel.)

The real question is, how will the engine cool, once you have the fuel
to
the boiling point, and also how rapidly can you boil off a tank of
fuel.
--
Jim in NC


Why would the fuel boil? Glycol/water coolant doesn't boil if the
engine
temps are normal. I seem to recall the boiling point of diesel is
greater
than glycol/water. That would depend on the rate the heat was rejected
by
the 'radiator' and the pressure of the cooling system. If heat input
was
less than the heat rejection capacity of the radiator, then the fuel
"coolant" wouldn't overheat.

Using fuel as a coolant is a respected technique used by rocket engines
and
the SR-71.

Bill Daniels


It doesn't boil because it's under pressure. You wanna pressurize your
Nimbus wings to, say, 32 feet of water pressure?

Tim Ward



Who said anything about carbon composite wings? If anyone tried this
scheme, they would use thick metal wing skins with enough stringers to
withstand a little overpressure.

Anyway, the 75 gallon tanks in my Nimbus wings will be used for Jet A when I
put the little retractable turbojet on it.

Bill Daniels