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Power-Torque Weighted Solidity
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The rotor power or torque coefficient can be written as
Assuming constant C(i and uniform inflow then the equivalent power-torque weighted solidity is
(3.152)
The torque weighted solidity is analogous to the activity factor used in propeller design. It is also used in wind turbine design but rarely in helicopter design. Again, McVeigh & McHugh (1982) suggest a modification to the weighted solidity if swept tip blades are used so that
ae — 4 f o(r)r3 cos2 A(r) dr. (3.153)
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