Discussion
A gas generator turns at \( 30\,000 \ \mathrm{rpm} \) and the propeller at \( 1500 \ \mathrm{rpm} \). The gearbox reduction ratio is
Answer: B
Correct answer: 20 to 1
The reduction ratio is the input speed over the output speed:
\[ \frac{30\,000}{1500} = 20 \]Reductions of this order are unavoidable: the gas generator must turn fast for its small-diameter turbomachinery to work efficiently, while the propeller is limited to a low speed by its tip Mach number. The gearbox that bridges them is heavy, expensive, and often the limiting component in the whole installation.
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