The 200749 6-cylinder V-engine giving 235 hp was installed on the Eagle II helicopter. It was driving a compressor that supplied air to the ends of the rotor blades to produce its rotation.

-Another Evinrude with 4 water cooled cylinders giving 140 hp, (marine engine) was tested on the Scorpion autogyro. Or the Evinrude Starflite 85 hp, (ref nasm 24904).

From Appendix 6: Another new adaptation of a 10 hp bi-cylinder for motor gliders.

“Evinrude adapted aero-engine with two superimposed propellers” (PeT=ps)