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In what proportion should the propulsive thrust be so that the aircraft will decelerate?

In what proportion should the propulsive thrust be so that the aircraft will decelerate? Correct Answer Thrust is less than airframe drag

The aircraft will descend if the propulsive thrust is less than the airframe drag. The descend flight path can be varied from a shallow descent to a very steep descent either by reducing the engine thrust or by increasing airframe drag.

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