A theoretical analysis of the hovering performance of rotors having various combinations of twist and plan-form taper was made in order to estimate the effects of blade twist and taper on rotor efficiency in hovering. The calculations were made with the aid of a strip-analysis procedure similar to that used in propeller analysis, the comparisons being made for rotors of equal solidity. The solidity of the tapered blades was computed by means of an equivalent chord which was derived by weighting the values of chord at each blade element according to the square of its radial distance.
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