Discussion
Consider the following statements about drag reduction on a transport aircraft:
1. Skin friction is roughly half the cruise drag.
2. Riblets act on the near-wall turbulent structures.
3. Laminar flow control is easy to maintain in airline service.
Which of the statements given above is or are correct?
Answer: D
The first two are correct. The third is emphatically false: insect contamination, rain, erosion and manufacturing waviness all destroy the laminar run, and keeping a leading edge in the required condition through a normal duty cycle has proved the central obstacle.
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