How about creating an air-cooled two-rotor by putting two of the
proposed
air-cooled one-rotor's in series?  You could make an intermediate
housing,
the core of which is a mesh of fins for heat transfer.

Grant Schemmel

Hard to get enough air and fin area to cool between the rotors. Not
enough room.

This one rotor version on the other hand is easy to do. Use a peripheral
port and an external oil pump. The rotor housing is still liquid cooled
with modifications to allow the water to flow from chamber to chamber.
New water inlets and outlets are drilled and tapped into the rotor
housing. Cold water into the spark plug area first. The end housings
have simple steel wear surfaces held in place by the rotor housing
and the steel front and rear main bearing holders.

Paul Lamar

For the 2 rotor, include a squirrel cage fan in between the rotors
that's attatched to the eccentric.  Duct it to pull air past all the
cooling fins.

As long as we're just dreaming,

Chris Cosman

The problems with high power fans is they suck HP and consequently burn fuel.
Paul Lamar

But aren't you doing away with a water pump in this sccenario? Or, at least,
the need for as powerful a pump as you need to pump coolant through the engine
block, plumbing, and cooler. Of course, if you want to make an intermediate
housing you'd need a different drive shaft, right? While we're being crazy,
maybe you could use the 20B shaft and just not install the middle rotor,
filling the space with a cooler-like fin arrangement. If you baffled it, you
could even blow air in the intake hole and out the exhaust. =)

Heck, get really crazy. What about using a turbo as a blower instead of as a
real turbo!?!?!?! Sure, it takes engine power to do it, but what does it do?
It blows air. It seems pre-made for the purpose.

-Chad

No! Still must have a water pump but it is much smaller. Perhaps even a wimpy
electric water pump MIGHT work.

An all air cooled two rotor would require a longer
e-shaft no doubt about it. On the other hand you might get torsional resonant 
problems. The cut down 20B shaft sounds like a good way of seeing if it 
can be done. Good idea. I would use just the front and second rotor part.
Do away with the third rotor. The special 20B intermediate housing width 
(wider than the two rotor part) might just be wide enough.

Paul Lamar
 
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