A simplified rotor model was used to further explore fundamental behavior of lifting rotor induced power at moderate and high advance ratios. Previously noted unusual trim and power characteristics at moderate and high advance ratios including trim control reversal, multiple trim solutions, and significant non-ideal rotor induced power levels were further investigated. The effect of the propulsive trim condition was found to have a significant effect on induced power. Blade twist was also found to induce very high power at high advance ratio. These effects were evaluated and interpreted using an equivalent wing analysis previously developed based on Prandtl finite wing theory. HHC and blade twist variables were investigated for reducing high non-ideal induced power levels at high advance ratios and preliminary results were found to be very favorable. Fundamental understanding arising from these investigations has enabled improved means of describing lifting rotor induced power in terms of the rotor blade and geometric parameters associated with the several trim operating modes.
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