American Flyer wrote:

Has anyone explored the possibility of using a prop with say 
four blades (or possibly even more) of say 35" diameter with direct
drive at 6000RPM instead of a PSRU? I know very little about the 
aerodynamics of props, but I assume that at least one problem is
the fact that more of the airflow would be blocked by the engine 
cowling. I notice that ducted fans have far more blades, but of
course have to be ducted, making them impractical for a conventional airframe.

Harrison Young

 
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