smokey_bear_40220(at)yaho
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 Posted: Sun Dec 03, 2006 10:30 am Post subject: Engine cooling - was Subaru EA-81 |
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That is a lot of great info Jan. Thanks.
The engine heat diagram is very informative.
I am reminded of the piston jet engine I read about
years ago. The entire thrust of the engine was a
produce of the exhaust. No prop. The piston was free
to oscillate between 2 cylinder heads on opposite ends
of a cylinder. It was a 2 cycle, and the intake and
exhaust were in the middle of the cylinder.
The exhaust was fed into a chamber where water was
injected and the steam was then blown out thru a
nozzel. Lots of thrust and noise were the results.
But I wonder how much of the origional energy was
turned into thrust by this simple engine? It could
have been much more energy efficient than our piston
engines turning a prop. But the need to carry a lot
of water around to make the steam for continuous
thrust was certainly a reason for it to never be
produced.
What keeps it in my memory is that our heat loss thru
the exhaust can be used for short periods of time and
much thrust using a small amount of water. It would
be interesting to figure out how much thrust can be
gained for how long with one gallon of water. Could
be a great short field performer. Even better, you
can get more thrust on floats, where you can feed
water from the lake rather than carrying it with you.
Much thrust increase for little added weight, but then
there is the back pressure in the exhaust to contend
with too.
Just some ideas to pass out for those who want to
really experiment.
Kurt S. S-5
--- JC Propellerdesign <propellerdesign(at)tele2.se>
wrote:
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