In aircraft at less than 100 HP per rotor use the ribbing of the
internal  water jacket has not been proven necessary. Perry Mick and
Chuck Dunlap both  flew their engines for hours at 220 to 230 F with out
apparent harm to the  rotor housings.

Racing Beat is fond of doing it for racing engines however.
Here is what it looks like. Racing Beat also adds an additional water
port for turbo engines generating over 300 HP per rotor. Second picture.

Paul Lamar

Matt Prather wrote:

300hp per rotor!  I assume they have run one of these things on a
dyno.  How long do they run it at that power level?  This is for a drag
application?

Matt-

Two or three hundred hours so far. Drag, boat or aircraft I am not sure which. 
It is now up to 1200 HP or 400 HP per rotor. The first picture is the Racing 
Beat engine. That is with alloy center and end housings no less.
The big thing on the bottom is the really big turbo charger.

The second pic is a roots blown 1400 HP p-port three rotor from Western Australia.
The rusty device is a blow down turbine from an R3350 TC soon to be
added to the engine for 20% more HP and torque. Drag race engine needless to say.
 
Paul Lamar
 
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