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What is blade lock number?

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What is blade lock number?

(a) Ratio of inertial and aerodynamic force

(b) Ratio of aerodynamic and inertial force

(c) Ratio of viscous force and aerodynamic force

(d) Ratio of inertial force and viscous force

The question was posed to me during an online interview.

This key question is from Helicopter Rotor and Notations topic in division Helicopter Dynamics of Aerodynamics

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Best answer
Correct option is (b) Ratio of aerodynamic and inertial force

The best explanation: The rotor blade’s lock number is given as the ratio of the aerodynamic and inertial force. The formula is:

γ=\(\frac {\rho acR^4}{I_b}\)

Where, γ is the blade lock number

a is blade section two-dimensional lift curve slope

c is the chord length

R is the radial location to the blade tip

Ib is the moment of inertia of the blade

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