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Here is how the object is able to escape burning up: It takes some of the atmosphere along with it as it goes. The air molecules surrounding the saucer are pulled by the "G-Field" along with the craft. It will slide through the atmosphere protected from the direct effect of friction upon its metallic skin. There will indeed be friction in flight, but this will be between air molecules carried along on the outer fringe of the gravitational field and the surrounding air. Similarly, Oberth's (and Plantier's) theory can explain why the structure of the vehicle as well as its presumed occupants are able to survive the enormous inertial forces generated by drastic changes of direction at high speeds, or equally drastic linear acceleration and deceleration. Each molecule of the vehicle occupants or contents is locked in the artificial field which has been created. This field is strong enough to overcome all relevant inertial forces. Thus the structure and its occupants remain unaffected during any maneuverings. One way to visualize this is to imagine a man sitting in an easy chair in his house on the surface of the Earth. From the viewpoint of an observer in space, the man and house are in very rapid motion, and further motion is not rectilinear. From a vantage point on one of the "fixed stars" the path traced out by Yet, because of the gravity of the earth, the man in his chair is quite unaware of being twirled against inertia. Within the four walls of his house he is, in his view, at rest. The situation of a saucer occupant would be, according to Oberth, exactly the same. He could sit reading or playing dominoes totally encompassed by the artificial gravity field and unaware of violent gyrations being performed by his craft. Its artificial gravity field would overcome both the gravity field of Earth and inertia. Oberth's G-Field theory is admirably able to explain the inertial problem. The astonishing kinematical behavior of the extraterrestrial craft is thus solved. However, any theory which attempts to account completely for UFO propulsion must also surmount other hurdles. These relate to suspension and translational force. While some UFOs appear to use reaction motors (i.e., rocket thrust), others employ no visible method of suspension or translational movement. Nothing in the G-Field theory seems to account for the ability of the craft to hover or fly horizontally. G-Field theory supplies an answer only as to how the craft overcomes inertia, it does not tell us how it flies. If the saucers generate an artificial gravity field, there is nothing in the analogy of natural gravity to explain why they do not fall to Earth. Rather, one would expect mutual attraction between the Earth and the gravitationally enhanced saucer. In order to surmount these difficulties, an exponent of the G-Field theory must suppose field characteristics different from natural gravity, or postulate an entirely different, unrelated field which accounts for the suspension and level flight of the object. It should be said that Lt. Plantier's theory, which postulates a cosmic flux of an unknown nature, may succeed in explaining the lifting and translational power of the craft. The cosmic radiation is accumulated by an engine, and powers the vehicle. According to Plantier, a field very similar to Oberth's G-Field results; however the relationship between these two aspects of his propulsion model is nuclear. This may be the fault of the summary of his work which I have seen; the man in the easy chair is an involved corkscrew or helix.