Discussion
A helicopter rotor turns at \( 258 \ \mathrm{rpm} \) driven through a main gearbox from a power turbine at \( 21\,000 \ \mathrm{rpm} \). The overall reduction is approximately
Answer: A
Correct answer: 81 to 1
The overall reduction is
\[ \frac{21\,000}{258} \approx 81 \]A helicopter main gearbox is therefore an even more demanding component than a turboprop’s, reducing a very high turbine speed to a rotor speed of a few hundred rpm in two or three stages, while carrying the whole weight of the aircraft through its rotor mast. It is among the most safety-critical and maintenance-intensive items in the machine.
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