a helicopter rotor

A helicopter rotor has four blades, each 3.40m long

from the central shaft to the blade tip. The model is rotated

in a wind tunnel at 550 rev/min.

a) What is the linear speed of the blade tip?, in m/s ?

b) What is the radial acceleration of the blade tip

expressed as a multiple of the acceleration of gravity, g?

1 Answer

  • 天同
    Lv 7
    7 years ago
    Favorite Answer

    (a) 550 rev/min = 550 x 2.pi/60 rad/s = 57.6 rad/s

    Linear speed of blade tip = 57.6 x 3.4 m/s = 196 m/s

    (b) Radial acceleration

    = 3.4 x 57.6^2 m/s^2 = 11280 m/s^2

    2013-05-28 18:27:13 補充:

    (b) when expressed in terms of g,

    11280 m/s^2 = 1128g take g = 10 m/s^2

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