Experiments with slotted wings

G. Lachmann
naca-tn-71
Nov 1921


The idea of increasing the lift of an aerofoil by subdividing it goes back to gliding flight experiments by the writer before the war. A crash in August, 1917, with Rumpler C airplane, on account of stalling, caused the idea to be put into concrete form and presented for a patent in 1918.

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