Discussion
Arrange these events as an air breathing engine climbs to altitude:
1. Ambient density falls with height
2. The mass flow the engine can process falls
3. Thrust falls roughly in proportion
4. Falling ambient temperature partly improves the cycle
5. The net thrust lapse is gentler than density alone predicts
Select the correct sequence.
Answer: C
The density effect dominates and the temperature effect partly offsets it, which is why a simple density scaling is conservative. Knowing which way each contribution acts is what makes an estimate defensible rather than merely arithmetic.
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