Paul and friends,
There are some newbies here that haven't followed and don't have
archival copies of the threads here to learn about the P-porting.  I am
one.

How about some pictures and explanations.  Awhile back I saw the slider
type valve, please explain.  Did I read that the p-port is used only for
WOT ?  And somewhere I saw a picture of the machining process... more
explanation and pictures please.

Are there any flying Rotaries in Iowa ?

Kevin
Naples/Ottumwa

A P-port is a large hole drilled directly into the rotor housing.
It breaths much better than side ports therefore the
engine develops more power over the RPM range used in aircraft engines.
About the largest hole one can drill in a 13B is about 2 inches in diameter.
If a butterfly valve is used to throttle the engine the aerodynamic
drag of the butterfly valve mechanisium limits the breathing.
A slide valve throttle on the other hand is completly out of the way when
wide open.

Paul Lamar


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