CIA

“ Changes in elevation from 800 to 1,000 meters could be accomplished in a few seconds; the disks often shot down to within 20 meters of the tree tops. Pierre did not regard it possible that the disk could be manned, since the irregular speed as well as the heat would make it impossible for a person to stay inside the stable core. Pierre had to give up pursuit after 15 minutes since both disks, with a loud whistling sound which be heard despite the noise orf his own plane, disappeared in a straight line toward Lake Tanganyika. He estimated their speed at about 1,500 kilometers per hour. ”

“ The roller bearing is shown by the letter L. The launching occurs at a sharp angle in the manner of a discus throw; the revolutions per minute of the rim probably amount to 22,000. The jets on the bottom of the rim serve to propel the disk vertically upwards; lateral steerage results from switching on and off various jet groups. ”