In the 50s it had to be Dizzy Addicott flying the Scottish Aviation Single Pioneer. At Farnborough, V strong wind down the runway. T/O roll about 20 (twenty) feet , rose vertically and proceeded to fly backwards. With the huge LE slats and massive flap area, stalling speed was ridiculously low - keeping the aircraft at just above the stall speed, he managed a negative groundspeed!
