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Which of these is not the purpose of rotor blade?

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Which of these is not the purpose of rotor blade?

(a) Generate lift

(b) Counter weight

(c) Provide thrust

(d) Generate drag

I got this question in an online interview.

The above asked question is from Blades and Propellers topic in portion Helicopter Dynamics of Aerodynamics

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Best answer
The correct option is (d) Generate drag

Best explanation: The rotor system of the helicopter comprises of two or more blades whose main aim to generate the lift, counter or support the heavy weight of the helicopter while hovering, and provide thrust which counters the drag generated as a consequence of lift generation.

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