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Old 18th Jan 2010, 18:28
  #90 (permalink)  
Graviman
 
Join Date: Nov 2004
Location: Cambridgeshire, UK
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Bug,

Have you worked out the effective hinge offset with the ring rotor? I ran into headaches using standard Prouty equations. The easiest method is to compare rotating flapping frequency with rotational frequency then use:

Lead angle = 90 * (rpm/60) / frequency.

Rotating flapping frequency will be a standard output from your FEA (or test).

I'm sure this is old hat...
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