Dear Paul and Others,

I am in the process of building a Pietenpol aircraft and, as such,
am a member of a Pietenpol Forum of builders. A member recently
posted the attached pictures and asked if anyone could ID the
engine. Can you help? Is it a rotary engine? I am not sure if he is
interested in putting a rotary engine on a Pietenpol, but he asked.
I know that the Pietenpol may have the distinction of having had
more choices of powerplants  than any other aircraft. Over 30
different engines have been documented. Do you know of any builders
that hung a rotary engine on a Pietenpol? I would be interested to
know and will, of course, pass the information along to the other
Pietenpol builders. Thanks in advance for any information provided.

Semper Fi,

Terry Hand

Looks like a seven cylinder liquid cooled radial.

Perhaps 2 cycle. Could be sleeve valve.

A one rotor would make a great Pietenpol engine.

Paul Lamar


I think Paul is right with the 2 stroke radial as the turbo outlet goes in
close to the center rear. It may have sleeve valves for the exhaust and ports
in the middle of the cylinder for intake. It could also have poppet valves in
the manner of flat head engines. It looks to me to be a 5 cylinder by looking
at what appears to be an injection pump on the front to the left of the belt
PSRU, which has 5 outlets.

Dale Davies

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