Pilots of full scale airplanes use flaps for takeoffs and landings.

They increase the lift for takeoffs. The takeoff settings are often about half what the landing settings are.

They increase the drag and lift for landings. The landing settings are often about twice the takeoff settings. Sometimes the pilot stages the flaps down on the approach as the airplane is slowed from cruise to landing speed. He will pull, say 1/3, flaps first, then another 3rd, than full.