Discussion
Consider the following statements about thrust reversers:
1. On a high-bypass turbofan they act mainly on the fan stream.
2. They are not credited in the certified rejected takeoff distance.
3. They are most effective at low ground speed.
Which of the statements given above is or are correct?
Answer: D
Correct answer: 1 and 2 only
Statement 1 is correct: on a high-bypass turbofan most of the mass flow is in the fan stream, so that is what the reverser turns. Statement 2 is correct: reversers are not credited in the certified distances, which assume brakes and spoilers alone.
Statement 3 is false and reverses the truth. Reversers are most effective at high ground speed, where the momentum change is greatest; at low speed their effect falls away and re-ingestion becomes a hazard, which is why they are stowed.
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