Nick, this similar to the 72 degree pitch lead angle on the R22? So from optimum lead angle at 1g, a reduced Nr produces a deeper rotor cone thus producing forward flight starboard roll and "wee-wa" if not corrected. For all the acrimony R22 works very well with "missing 18 degrees".
Mart
Last edited by Graviman; 16th Dec 2006 at 10:40.
Reason: Corrected cone angle for reduced Nr