Rotorcraft Aeromechanics Applications of a Comprehensive Analysis,” Presented at Heli Japan 98

Results from the comprehensive analysis CAMRAD II are presented, illustrating recent developments in the aerodynamics and dynamics models, and demonstrating the technology that is needed for an adequate calculation of rotorcraft behavior. Calculations of rotor performance, airloads, structural loads, and stability are presented, including comparisons with experimental data. 1. Nomenclature. A rotor disk area, pR2 CD rotor equivalent drag, CP /m + CX CL rotor lift force (wind axes), L /rA(WR)2 CP rotor power, P /rA(WR)3 CT rotor thrust, T /rA(WR)2 CX rotor drag force (wind axes), X /rA(WR)2 D/q airframe drag divided by dynamic pressure M blade section Mach number r blade radial station R blade radius cn blade section lift coefficient cm blade section moment coefficient as shaft angle of attack (positive aft) m advance ratio, (flight speed)/WR r air density s rotor solidity, (blade area)/A W rotor rotational speed 2