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76 "It could be built with variable-direction jet or rocket nozzles," be said. "The nozzles would be placed around the rim, and by changing their direction the disk could be made to rise and descend vertically. It could hover, fly straight ahead, and make sharp turns. "Its direction and velocity would be governed by the number of nozzles operating, the power applied, and the angle at which they were tilted. They could be pointed toward the ground, rearward, in a lateral direction, or in various combinations. "A disk flying level, straight ahead, could be turned swiftly to right or left by shifting the angles of the nozzles or cutting off power from part of the group. This method of control would operate in the earth's atmosphere and also, using rocket power, in free space, where conventional controls would be useless." "What about a rotating disk?" I asked the N.A.C.A. man. "Suppose you had one with a stationary center, and a large circular section rotating around it? The rotating part would have a camber built into it, or it would have slotted vanes." "It could be done," he said. "The slotted-vanes method has already been tried. There's an engineer in Glendale, California, who's built a model. His name's E. W. Kay." He gave me a few details on how a cambered or slotted-vane rotating disk might operate, then interrupted himself to ask me what I thought the saucers were. {p. 89} When I left the building a few minutes later, I was still weighing that statement. If the Air Force or the Navy had a secret disk device, the N.A.C.A. would almost certainly know about it. The chances were that any disk-shaped missile or new type of circular aircraft would first have been tested in the N.A.C.A. wind tunnels at Langley Field. If the saucers were interplanetary, the N.A.C.A.--at least top officials--would probably have been in on any discussion of the disks' performance. Either way, the N.A.C.A.'s official attitude could be expected to match the Pentagon's. After lunch, I took a taxi to the office of the private engineer. Like D , he has asked that he not be quoted by name. The name I am using, Paul Redell, will serve that purpose. Redell is a well-known aeronautical engineer. He has worked with major aircraft The method he had described was not the one which D------ had outlined. He gave me a curious look, "Where'd you get that idea about the camber?" I told him it had come to me from True. "They're either interplanetary or some secret development," I said. 'What do you think?" "The N.A.C.A. has no proof they even exist," he answered.