As far as I know, the Doyne conversion included 180hp engines and a gross
weight increase. I think Doyne made a new dorsal fin similar to Geronimo.
I do not know if the props were swapped with no-ad props or not.

Jim


"JAX" wrote in message
oups.com...
I've seen some Apaches listed that are 'Doyne conversions' but I can't
find what the conversion involved, except maybe 180hp engines. I know
about Geronimos, but what exactly makes up a Doyne conversion Apache?