Discussion
Assertion (A): Fillets are fitted at wing-body and tail junctions on almost every aircraft.
Reason (R): Corner flows accumulate low-momentum fluid from two surfaces where the pressure is already rising.
Select the correct answer from the options below.
Answer: D
Both are true and the second explains the first. Without a fillet the corner separates early and produces a disproportionate amount of interference drag, and often buffet as well. Easing the corner geometry is a cheap and standard cure.
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