PING to above.
Again from:
http://www.karenlyster.com/ufoland.html
Recently declassified documents explain what it might have been. During the 1950s and 1960s, the U.S. Air Force experimented with electrostatic drives. In
A sample of the Ubatuba debris (below) examined under a microscope (above) revealed a higher level of purity than occurs in nature.
[micrograph] PHOTOS [at the link] COURTESY OF WALTER WALKER AND J. ALLEN HYNEK CENTER FOR UFO STUDIES
theory, lift and propulsion can be created by imparting airframes with an electric charge that matches, and therefore repels, the surrounding air. Such an aircraft would require enormous amounts of electric power, and the Air Force seemed to know how to create it. Other declassified documents reveal the Air Force had built compact nuclear reactors small enough to fly on an aircraft. It had also experimented with a device known as a magnetohydrodynamic generator (MHD) to extract large amounts of electricity from a fast-moving stream of molten metal. Engineers familiar with such systems say that if MHD units were to become unstable, some of the metal circulating in the unit would have to be ejected.
UFO investigators sent a portion of the Ubatuba material to the Air Force for analysis. It was ‘accidentally’ destroyed before tests could be completed.