Jan  You are supposing correctly  Wing flaps reduce stalling speed and this allows liftoff and climbout at a lower speed and hence they reduce the takeoff distance  During the ground roll and initial takeoff still in groundeffect the contribution to drag from the wing flaps is small  However wing flaps cause a significant contribution to drag during the climbout and this explains why there is a limit to the amount of flap used during takeoff and why pilots retract wing flaps as soon as they achieve the necessary airspeed  t 

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Jan  You are supposing correctly  Wing flaps reduce stalling speed and this allows liftoff and climbout at a lower speed and hence they reduce the takeoff distance  During the ground roll and initial takeoff still in groundeffect the contribution to drag from the wing flaps is small  However wing flaps cause a significant contribution to drag during the climbout and this explains why there is a limit to the amount of flap used during takeoff and why pilots retract wing flaps as soon as they achieve the necessary airspeed  t 

