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What is the effect of excess thrust on an aircraft climbing at a constant angle? It...
• A
accelerates, and the rate of climb increases.
• B
accelerates, and the pitch angle increases.
• C
converts the excess thrust to increase the flight path angle.
• D
accelerates, and the climb gradient increases.

Refer to figures.
VX is the speed at which an aeroplane achieves its maximum angle or gradient of climb.
Since angle of climb depends on excess thrust, VX is the speed at which the difference between thrust available and drag is greatest.

Because thrust available against speed is different for turbojet and propeller aeroplanes, it must be established at what speed VX is for both types of aeroplanes.

If we are at our best angle of climb speed but there is an excess of thrust available at a constant angle then we will accelerate.
The ROC will increase.

Similarly if you are at your best Rate Of Climb ( ROC ) speed but there is an excess of Power Available ( PA )to Power Required then the ( ROC ) will increase.

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