Discussion
Approximate thrust lapse with altitude.
| Altitude (ft) | Density ratio | Thrust by density scaling | Typical actual thrust |
|---|---|---|---|
| Sea level | 1.00 | 100 per cent | 100 per cent |
| 10 000 | 0.74 | 74 per cent | 78 per cent |
| 20 000 | 0.53 | 53 per cent | 58 per cent |
| 35 000 | 0.31 | 31 per cent | 36 per cent |
Why does the actual thrust exceed the density scaling at every altitude?
Answer: C
Mass flow follows density almost directly, but the colder air raises the achievable pressure ratio and cycle efficiency. The two effects oppose each other, which makes a simple density scaling conservative rather than wrong.
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