Paul Yaw wrote:

Mark Steitle wrote:

Just when I thought that I knew something, Al Gietzen
wrote, "The standard 16-18 for the runner length is for
a 2-rotor, where the rotors "communicate". If you look carefully at
the timing of the intake strokes, you see that you want quite a

different

length for accoustic tuning for a 3-rotor than for a 2-rotor."

Any idea on what is the correct length for a 20b? (Paul Yaw)

Mark Steitle

The correct length is...adjustable!!!

Once it's running, you can find out what's best.

PY

Not only that but it could be adjusted over the range of 5000 to 6000 for
best BSFC at 5000 RPM cruise. Just like the Mazda Lemans four rotor.

Paul Lamar
 
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