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The vanes of a helicopter has an angular speed of 60r/min. There are three vanes with...

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Mechanical Engineering

The vanes of a helicopter has an angular speed of 60r/min. Thereare three vanes with a length of 4.2 m and a width of 0.25m each.The air is at a temperature of 15ºC. Transition takes place atRecr = 3.2 e5 . Calculate the aerodynamic torquerequired to overcome skin friction.

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