On 16 Aug 2004 22:13:49 GMT, emove (AJW) wrote:

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

They aren't in general use anymore, but ALL the big engined WWII
aircraft used some sort of gear reduction unit to turn the prop, every
single one of them.

You don't see that so much anymore in certified airplanes, but in the
world of experimental homebuilt aircraft where auto conversions are
not uncommon, they are in use.

Corky Scott