Paul,
    What about this for the F1 Rocket. Turbo under the engine.  Forward
    lower cowl air inlet ducted thru intercooler, larger duct to and around
    turbo and exiting / ejecting aft lower cowl, with air exiting from rad
    and oil cooling.
    Would this be more efficient and help with cooling the turbo?
    Dave D.

    You have to be real careful about placing a turbo too low.
    A major problem is oil drain back out of the turbo. It should be mounted
    Well above the oil level in the oil pan. Either that or it gets real
    complicated with a scavenge pump.

    --
    Paul Lamar ...No rotor no motor.



Paul,
The oil situation could be done with a dry sump cannister to maintain
proper oil level.
What about the rest of the idea.  Or is it adding complexity for not
enuf gain?
One more concern that I have is getting an ejector effect worth this
extra ducting and such.
Dave D

Same problem. You have to get the oil back up into the oil pan so you need
a pump.

I have come to the conclusion there is no practical way
to cool the exhaust. If you water cool it adds to the cooling
system load. If you pump cool air in there it might increase the heat
due to unburned fuel. If you take the P47 route you add to the frontal
area with all the external ducting required.

The best bet is to get the compressor load on the
rising side of the turbine HP curve so the compressor will self
regulate the turbocharger  RPM. Just like a prop limits the RPM
of an engine. The blade temps are already about half EGT's so there
is not much to be gained there. Turbines are different than ICE's
in that the HP can drop off by over revving them. Too much RPM hurts
them as much as too much temperature.

-- 
Paul Lamar ...No rotor no motor.

Per your excellent points Paul, cooling with air flow also adds to overall
cooling drag and the potential for significantly reduced cooling drag is one
of the signature advantages of the rotary over an air cooled recip.

Steve Beckham

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