PPRuNe Forums - View Single Post - What causes "blowback/flapback" when accelerating through transverse flow effect?
Old 17th August 2022 | 11:01
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fdr
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From: 3rd Rock, #29B
Originally Posted by [email protected]
Oh no, we'll be getting into 'wee-wah' next!
I think we did with the lag <90...

When the controls positions are recorded, the S shape that occurs is pretty to break down, the lateral change is initially from inflow roll, the hover longitudinal to ETL to high speed is from the flap back initially and then from the balance of forces with the thrust/drag couples around the beast.

Alternatively.... for a 2 blader.... the hub reaction forces are "simple"... Per Uncle Wayne


19.8 Rotorcraft Aeromechanics, Johnson (2013)

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