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

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