Discussion
Three of the following are trailing-edge high-lift devices. Which is the odd one out?
Slat
Plain flap
Split flap
Fowler flap
Answer: D
Correct answer: Slat
The slat is a leading-edge device: it moves forward to open a slot through which high-energy air passes onto the upper surface, delaying separation and raising the stalling angle. Plain, split and Fowler flaps are all trailing-edge devices, acting by adding camber and, in the Fowler case, area. Leading and trailing-edge devices are complementary - the slat raises the angle at which the wing stalls, the flap raises the lift at any given angle.
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