Discussion
Consider the following statements about laminar-flow aerofoils:
1. They hold a favourable pressure gradient over much of the chord.
2. Their low-drag advantage is confined to a band of lift coefficient.
3. Their advantage is robust to surface contamination.
Which of the statements given above is or are correct?
Answer: B
The first two are correct and describe the drag bucket. The third is the opposite of the truth: insects, rain and manufacturing waviness readily trip the layer, and the measured in-service benefit is often a fraction of the wind-tunnel figure.
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