"Dylan Smith" wrote in message
...
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.

Or any Rotax engined plane.

Paul