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As any tendency to remain in a place disappears in the hypothetical world of inertialessness, the slightest application of pressure would cause a mass, even a very large mass, to move in the direction of the pressure, perhaps at a very high speed. A small jet engine, perhaps even a tiny fan jet of air, may be all that is necessary to accelerate a large and weighty craft to a great velocity. Or, the riding lights which often ring saucers may act as combination engines and stabilizers. A light source creates a slight force, opposite to the direction of beam. It could be that the force needed to propel a craft in "a Space Valve" or to support it against terrestrial gravity is so slight that even a fight source would suffice. Similarly, there may be difficult problems of stabilizing and balancing an object with mass reduction, problems which may have been solved by placement of lights integrated in intensity and reaction force, by a computer. The Space Valve theory can explain the fact that saucers do not burn up as they pass through the atmosphere. We have considered the G-Field hypothesis of the atmosphere being compressed close to the craft, but not producing heat at the surface of the craft. The Space Valve theory results in the same effect, but in a different way. Consider a craft moving rapidly through the atmosphere surrounded by a field which negates or reduces inertia; as a molecule of air enters the field, it loses its kinetic, that it its inertial, properties. It may bounce off the object without causing any impact, even the tiny impact of the gas molecule. Thus, the Space Valve may be frictionless because it is inertialess. The friction caused by something passing through the atmosphere is due to the grip of inertia upon gas molecules. Remove this grip and the molecules may behave - as indeed may the vehicle - in an incredibly free fashion. As the Space Valve theory is able to explain all three requirements of a UFO propulsion system, would not economy of explanation give it preference over the G-Field theory which is able to explain only one requirement? This would surely be the case were it not for one serious difficulty of the Space Valve theory. As Professor Oberth pointed out to me in a letter of November 9, 1964: "Almost all biological processes are the result of forces that act against the inertia of molecules and atoms. If, e.g., men (were) in such an inertia-screen, their blood would run (at a) horrid velocity. Likewise, their The objection is a serious one, and would apply to any living form which had evolved in the inertial world. Barring some special techniques unknown to us at present, it would rule out transporting of life. It could be that the UFOs which employ a Space Valve principle are indeed unmanned craft; real aliens are visiting this planet, they may be the occupants of the rocket-type devices which have been seen. These may not employ inertialess flight. Again, it could be that if living occupants are present, that inertia and gravity are reduced only to a tolerable point, and not eliminated altogether. Many of the UFOs appear to have reduced gravitational-inertial mass, but not to be totally free of inertia and gravity. Life under such circumstances may be possible. metabolism would be too fast for survival." Again, it may be that total or substantial inertialessness is achieved only directionally. If the action and