Discussion
Thrust and efficiency for a fixed flight speed of 250 m/s.
| Jet velocity (m/s) | Velocity increment | Propulsive efficiency |
|---|---|---|
| 1000 | 750 | 0.40 |
| 600 | 350 | 0.59 |
| 350 | 100 | 0.83 |
| 250 | 0 | 1.00 |
What does the last row demonstrate?
Answer: B
Thrust depends on the velocity increment, which vanishes when jet and flight speed are equal. A practical cycle therefore settles somewhere in the middle of this table, accepting some efficiency loss in exchange for useful thrust.
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