In article ,
"Lincoln Brown" wrote:


Did the Curtiss or P&W Radial engines rotate on a mount and spin the
propellor like their WWI predecessors or were they fixed and drove a
propellor shaft?

No. The engine was bolted to the airplane, the crankshaft turned with
the propellor.

Additionally, what effect if any would flying inverted for an extended
period have on a radial engine.

That would depend on the fuel and oil system. It they are setup so as
to provide fuel and lubrication while inverted the engine won't know the
difference (half of it is upside down all the time).

--
Dale L. Falk

There is nothing - absolutely nothing - half so much worth doing
as simply messing around with airplanes.

http://home.gci.net/~sncdfalk/flying.html