I am building a Pietenpol.  The aircraft could handle up to 100 hp.
The engine however must be able to swing a 72 inch prop.
Would your rotary do that ?  Could it be used in a pietenpol.
Could it be done economically?
Thank you

David Jones

Can a Pietenpol handle 300 pounds firewall forward.
If so the answer is yes using a 2.85:1 PSRU and a stock 2 rotor.

If no... one can build a one rotor that will put out
about 100 to 120 HP with about 50 pounds less FW weight
still using a 2.85:1 PSRU.

If one were to build a one rotor P-port with after market
aluminum end housings one could get the weight below
200 pounds FW still using a 2.85:1 PSRU.

BTW what does a Ford Model A engine weigh firewall forward?

Paul Lamar


According to Dave Williams engine weight chart (fixrambler.com/art62.html)
the model A engine was 475#. You likely need to add the radiator, fan and
possibly the intake and exhaust to that. They were stink heavy due to thick
wall casting and the poor iron available at the time. Found they got 25 to 30
US MPG back then. Where is the progress? '65 Mustang I6 rated at 30MPG also. I
think we took a step backward like drunks somewhere along the way!

Dale Davies