Paul,  Would the efficiency (cooling and speed) improve sufficiently
enuf to build a P51 style radiator box aft of the baggage compartment up
into the aft fuselage?  The cowl could certainly
be smaller and tighter.
Thanks,  David

Well perhaps but the big drawback to the P51 style cooling is additional frontal area.
Frontal area has nothing to do with whether the nose is pointy or not.
It is defined as the maximum cross sectional area of the airplane.

What is the "frontal area"? The frontal area is the area of a shadow
you get if you shined a spot light from some distance at your airplane parked
in front of a wall. It is not how pointy your airplane is. It is
the maximum cross sectional area of your airplane. Larger fuses
mean larger frontal areas which means more drag.

On the up side the prop eff. might improve slightly due to the pointy nose.

Also on the up side the exit duct and nozzle for the hot air is ideal.

Another proplem is the rate of water flow would slow down due to the lenght
of the water pipes. The pump would have to work harder. Also coolant weighs
about 8 pounds per gallon.

Another down side is the structure of the fuse would have to be redesigned.
Van G would have a fit if he knew you were cutting large holes in the bottom of the fuse.

One of the beauties of the rotary as an aircraft engine is its small size. It therefor
leaves room in the cowl for the rad which simplifies the plumbing and in theory makes
it more reliable.

Paul Lamar ...No rotor no motor.

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