Planes use flaps to land and to take off. So why do they retract them while they are on the ground, ie why not just leave them deployed?
In: Engineering
Because you have people and things moving on/around the wings when the plane is grounded. Leaving the flaps open means you take the risk that something breaks them or something to fall inside the wing an damage something. You don’t want to take off only to find out that, crap, you can’t close the flaps because there is a screwdriver in it, and now you tried to close it the thing broke down.
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