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Inflow ratio is defined as __________

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in Aircraft Design by (701k points)
Inflow ratio is defined as __________

(a) total inflow velocity to tip speed

(b) total lift by rotor to the total drag

(c) drag to lift ratio

(d) propulsive efficiency

I have been asked this question in examination.

My question is taken from Propulsion topic in section Propulsion of Aircraft Design

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Right option is (a) total inflow velocity to tip speed

The best explanation: Inflow ratio can be defined as the ratio of total inflow velocity to the tip speed. Drag to lift ratio is inverse of Aerodynamic efficiency. Higher Aerodynamic efficiency indicates that the aircraft will have higher lift.

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