FOR more than half a century, aeronautical researchers have attempted to augment wing-lift beyond the capabilities of mechanical flaps, slots, and the like. Theoretical studies and wind tunnel tests promised large gains in aircraft performance, but flight installations all over the world proved a long series of failures. Because of the problems inherent in the operation of high-speed jet aircraft, the Department of Defense revived interest in lift-increase systems.
A development of the Bureau of Aeronautics recently flight-tested on a Grumman jet fighter demonstrated what is considered the first practical, operationally suitable lift-augmentation system. Under the name of the BuAer Supercirculation System, whereby engine power was successfully diverted to create lift, it has provided new impetus for industry-wide research in the field.