[lemon1324]

Flaps and other high-lift devices will only make the problem worse--when you retract the flaps, your coefficient of lift drops, and so you get less lift at that particular point in the envelope. Now after you lift off (at half the ground speed, presumably) when you leave the accelerated air, the airspeed of the aircraft drops suddenly. If you also retract flaps, the aircraft will most likely stall and come crashing back down.