Double-Slotted Fowler Flap – Engineering Behind High Lift Performance The double-slotted Fowler flap is one of the most effective high-lift devices used on modern transport aircraft. Its design allows the flap to move aft and downward, increasing both wing camber and effective wing area, while the slots re-energize airflow over the wing at high angles of attack. * Key Engineering Benefits: \t•\tSignificant increase in maximum lift coefficient (CLmax) \t•\tDelayed boundary-layer separation due to