Depends on the flap design… Big planes usually drop their flaps on takeoff because of the design of their slats. If the slats scavenge air, you need them to take advantage of it by elongating the wings surface.
Depends on the flap design… Big planes usually drop their flaps on takeoff because of the design of their slats. If the slats scavenge air, you need them to take advantage of it by elongating the wings surface.