The drive shaft from the engine of a small air-plane applies to the propeller a

Question

The drive shaft from the engine of a small air-plane applies to the propeller a couple moment that is counterclockwise as viewed from the front of the plane (E54.28). The magnitude of the moment is 1.8 kN middot m. a. Determine the couple consisting of vertical forces between the wheels and the ground points A and B that is equivalent to this couple moment. b. Both of the vertical forces in a happen at the interface between the ground and the tires. One of the vertical forces-either the one at A or the one at B-seems to indicate that there is a tensile normal force between the ground and the tire. According to our discussion in Chapter 4, however, normal forces are compressive. How can this be?

Explanation / Answer

a) The couple moment is 1.8kNm

Distance between A and B = lever arm = 1.5m

The vertical force at A and B = 1.8/1.5 = 1.2 kN

b)The force at A and b will be of same magniutude and opposite direction

The force will be compressive at A and tensile at B

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