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Handley Page HP.17

hp17


Wing leading-edge slots, perfected by Sir Frederick Handley Page and Dr. G. V. Lachmann in 1919, were first flown on the H.P.17, a modified D.H.9. By controlling airflow over the wing and so enabling aircraft to fly very slowly under perfect control, they ended the danger of the stall-and-spin type of crash.

 


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