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WHY ARE THE OVERALL ROTOR DIMENSIONS SO LARGE?

April 26, 2017dimensions large overall rotor

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WHY ARE THE OVERALL ROTOR DIMENSIONS SO LARGE?

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A helicopter rotor behaves similar to a fan blowing air. The amount of air and the velocity of this air going through the fan (helicopter rotor) dictates the lift produced and power required. The lift produced by a helicopter rotor is proportional to the amount of air going through it (the mass flow rate). The power required to spin the rotor is proportional to the speed (velocity) of the air going through it. For a limited power input (human power) a larger rotor diameter is required to achieve the required lift.