It has been found recently that getting all air out
of a space even if it is hair thin results in near zero heat transfer.

Heck I could have told them that. The old thermos
bottle that kept your coffee warm for hours did exactly
that.

What we need is a rotor built that way to keep the heat
in the combustion chamber and out of the oil.

Right now one third of the cooling requirement is oil.

Those are the kinds of developments necessary to improve
the BSFC of the rotary. It is all about heat management.

Of course recovering some of the 50% of the fuel energy
in the fuel is exited out the exhaust pipe typical of all internal
combustion engines is still the greatest priority.

Paul Lamar

If that is the case then why did thermos bottles use the "silver" coating on
the glass ?

Roland Friestad


 Heat is transfered by molecular motion. No molecules
no heat transfer.  There is also radiation but as I recall those
thermos bottle did a very good job of keeping your coffee warm.

If you broke one you could see that it was double wall.

Maybe the silver coating was to cut down the radiation.

if in doubt google it :-)

"how does a thermos flask work"

Paul Lamar

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