[justme1969]

Im sure this legitimate but there is some info missing for those curious about it. These are wind speed specific devices there must be applied air pressure for correct operation. Alot of things that work on airplanes dont do so well at less than 100 mph so remember this when testing. for low speeds it may require 50% more pitch, or surface area etc. etc.

I cant remember which plane but they basically disturbed the air around the whole fuselage so the craft could use a shorter runway. sorta like an extra air cushion under that absorbs major leading edge pressure loads.