Discussion
Turboprop power at constant governed rpm.
| Torque (per cent) | rpm (per cent) | Relative shaft power |
|---|---|---|
| 60 | 100 | 0.60 |
| 70 | 100 | 0.70 |
| 80 | 100 | 0.80 |
| 90 | 100 | 0.90 |
Why is torque used as the power setting parameter on a turboprop?
Answer: A
Correct answer: With rpm governed constant, power is proportional to torque
Shaft power is \( P = T\omega \). The propeller governor holds rpm at 100 per cent, so \( \omega \) is fixed and power varies with torque alone - which is exactly what the table's relative power column shows, tracking torque point for point.
That proportionality is what makes torque a workable single power indication for the pilot. It is not that torque is easier to measure than rpm, nor that rpm is unmeasurable: both are indicated, and the relation holds only because the governor is keeping one of them constant.
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