flyrotary@lancaironline.net Mailing List Archive

I have heard that the 13B Pport has over 330 HP around 10,500 RPM. The port size at the rotor is just a result of late closing for operation at the high RPM. It reduces velocity and hurts lower RPM power. Same with the side port. Increasing bowl volume slows velocity and move peak power up the RPM band. Where rules allow, side port people fill in part of the bowl with epoxy to keep velocity high after extending the closing line. We are not allowed to add material at all.

Lynn E. Hanover

Lynn,

Do you think that's why some PP are sloped down - i.e. to limit extending the closing event too far up the RPM band,

Something to think about.

Just when I thought I had it sorted out.

George (down under)

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