George Moore wrote:

Paul,
   If a Rotary engine running with the Charge-Cooled rotors produces
less HP, what is the advantage in using them ?  Are they seeking better
emissions or fuel economy with this system ?  With less mass I would
imagine a quicker revving engine, but I also think there would be a loss
of flywheel effect with the reduced mass of the rotors. Either way, I
see no possible advantage to a Rotary engine in aviation use.

George

They become more like a classic two cycle engine and you can do away
with the oil pressure system and the oil cooler. One must use
anti friction ball or roller bearings throughout the engine.
The oil in the fuel does all the lubrication.

Note the massive caged double roller bearings for the rotors
in this picture.  charcoo2.jpg

Wankel GmbH has a patent on a cooling method for the main 
and rotor anti-friction roller bearings. In this case the 
billet e-shaft has a large hole drilled all the way through 
and water is circulated in the e-shaft for cooling the
bearings.

In higher volume Wankel would go with a hydro-formed-from-
thick-wall-tubing e-shaft already developed.

Paul Lamar
 
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