1. root twist or(de@ 12.0 10.6 9.64 twist shape z - 0.333 -0.333 - 0.326 reduced by 19.8, 6.1 and 5.2 percent, respectively. The Yrev torsional moment (mc)isreducedby 8.2percent. As expected, the largest reductions in the vibratory forces occur in Case I1 which comprises structural design variables only. This is followed by Case 111, which comprises aerodynamic and structuralvariables.