Topic summary
Handley Page
Extracted from the Wikipedia article Handley Page Limited.
Interwar period
Handley Page developed the Handley Page Slat (or slot), an auxiliary airfoil mounted ahead and above the wing, which formed a narrow gap which improved airflow at high angles of attack and improved low-speed handling. The leading edge slat was simultaneously designed by the German aerodynamicist Gustav Lachmann, who was later employed by Handley Page. The design was so successful that licensing fees to other companies were their main source of income in the early 1920s.