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As the picture below, what are these triangle components for? I find these normally installed under the Flaps. Thanks!!

enter image description here

Vin
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    Those are called anti-shock bodies and are placed on the wing to reduce wave shock drag. – Ethan Sep 24 '15 at 12:11
  • Of course one could argue it's a chicken-egg-problem. But I think the designers put the actuation system for the flaps under the wings because those are really needed. And they will cover them aerodynamically. Only then they will look at the area-rule and might adjust the size of the cover. They will certainly not start with "anti-shock bodies" and figure out later on if the actuation system will fit inside. – rul30 Sep 26 '15 at 06:41

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