Discussion
A turboprop develops \( 1500 \ \mathrm{kW} \) at a propeller efficiency of 0.86 and a flight speed of \( 120 \ \mathrm{m/s} \). The propulsive thrust is approximately
Answer: B
The thrust power is \( 1500 \times 0.86 = 1290 \) kilowatts, and dividing by the flight speed gives \( 1290\,000/120 \). The relation shows why a propeller gives such large thrust at low speed and why that advantage falls away with speed.
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