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

I don’t know about the silver thing but these Thermos did and DO a good job not
only keeping heat from escaping (i.e.: hot coffee) but also from entering, like
keeping a cold drink, cold for a long time.

Alfonso Lebron

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