Paul

Following the turbo discussions and noticing some of the drawings you did
for the SeaWind awhile back it might be advantageous if I mount the compound
turbine facing forward in the space behind the engine compartment wouldn't
it?  Chance to cool the exhaust down a little as well.

Prop speed RPM with 2.85 PSRU, would limit the engine RPM to aprox. 7700
establishing a prop  redline of 2700.   Your proposed  3 to 4K RPM turbo
gearbox  would also coincide with best airplane cruise performance. Great!!

SeaWinds usually have the exhaust pipes coming out the top to keep them away
from the water spray. Air intakes in the bottom and outlets on the top like
the Piper Navaho engines would work better than the present design.
Exhausting heat should be a little easier since it will want to rise as
well. I am planning on having my cowl custom made in carbon fiber in any
case so the radiator can be mounted on the bottom with its own scoop and
plenum so and warm air is vented through up and around the turbo/ waste gate
zone.

Doug in Japan

I vote for putting the rad on the cool side. The 20B is so narrow there
is little or no frontal area increase. (12 inches wide) Most cowlings have 
almost enough room left over on the cool side to install another rotary 
engine in there :)

Paul Lamar
 
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