14 inch spinner.

OK Doc tell me what you like or don't like.
The air intake can be an oval an ellipse or a circle
or almost anything. Smiley face perhaps?
You can mark these up in MS Paint save them as a jpg
and send them back.

Paul Lamar ...No rotor no motor.

Looks great!

Just a few questions. What about induction air? And cooling air for
accessories and exhaust system? I assume there would be separate inlets for
those?

How would you fab a smiley? :-) The oval looks good. Glad the shark's mouth
is gone.

Doc

You would optimally use a ram air scoop for engine induction
combustion air. Any well placed small NACA duct would add a little
under the cowl cooling air. The main scoop shown should be sealed to
the heat exchangers.

You can also have a P40 type scoop if you wish?

If you don't like this ram air scoop... looks like there is
enough room to come stright forward on the top front slope
of the cowl for a ramp scoop. Not a NACA as they are not
suited for carb ram air.