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Thread: Auto RPM
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Old 8th May 2003 | 17:24
  #12 (permalink)  
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From: EGDC
212man - the driving section of the blade certainly moves inboard as the inflow angle reduces due to disc tilt but the high AoA in the inboard section reduces which compensates for the increased area of 'dragging' section outboard. Overall I don't think there is sufficient change in the balance between dragging and driving sections to make a difference when all you do is move the cyclic forward.
Your explanation is very pertinent to autorotation at differing AUM or DA where the need to apply collective pitch to contain the Nr will affect the relationship between driving and dragging sections.
However if you believe the theory of flare effect, and that it works the same in auto as well as in forward flight, the converse must be true with forward cyclic producing 'negative flare effect'.
crab@SAAvn.co.uk is offline  
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