When the engine of the plane is running, the plane is running, the vertical reac

Question

When the engine of the plane is running, the plane is running, the vertical reaction that the ground exerts on the wheel at A is measured as 650 lb. When the engine is turned off, however the vertical reactions at A and B are 575 lb each. The difference in readings at A is caused by a couple acting on the propeller when the engine is running. This couple tends to overturn the plane counterclockwise, which is Opposite to the propeller's clockwise rotation. Determine the magnitude of this couple and the magnitude of the reaction force exerted at B when the engine is running.

Explanation / Answer

A) Couple = Force * Perpendicular Distance = 616 * 12 = 7392 ft-lb B) So as to act as couple the tire must have forces equal and oppositely directed. Therefore F= 616 lb oppositely directed.

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