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This diagram adds thrust available characteristics from propellers and jet propulsion to the total
drag curves. The propeller has highest thrust at slower speeds, with thrust decreasing as airspeed
increases. The thrust available from a jet aircraft tends to be relatively constant at subsonic
airspeeds:
The following diagram compares the power available and power required between swept – wing
jet aircraft and straight – wing propeller aircraft. The straight – wing propeller aircraft has the
greatest excess power at slower airspeeds relative to swept – wing jet aircraft:
