In article , AJW wrote:
I don't know of a SEL airplane in general use that uses reduction gearing
between the shaft and the prop, Dan.

Many hundreds of examples of Europa aircraft. My friend's Europa runs
the 4-cylinder, opposed, liquid cooled 914S engine at something like
5400RPM in cruise. I think the prop turns less than half that RPM.

--
Dylan Smith, Castletown, Isle of Man
Flying: http://www.dylansmith.net
Frontier Elite Universe: http://www.alioth.net
"Maintain thine airspeed, lest the ground come up and smite thee"