The skin friction of the missile at those speeds at those altitudes would melt any metals or nonmetals available. In some descriptions the beast spirals straight up. If you think of the fact that the centrifugal force in a few minutes of such a maneuver would press the crew against the outside, and do likewise to the blood, you see what I mean. There are many occurrences where they have done things that only a pilot could perform but that no human pilot could stand. Fourth, in most of the reports there is a lack of visible jet.
Most observers report units without visible flame . . .
If it would be any known type of jet, rocket, piston engine, or chain-reaction motor, there would be a very clear trail at high altitude. My opinion for some time has been that they have an extraterrestrial origin. No agency in this country or Russia is able to duplicate at this time the speeds and accelerations which radars and observers indicate these flying objects are able to achieve. They are not entirely actuated by automatic equipment. One passed through the missile exhaust and then rejoined the other.