Hi I have read page 212-213: "With the force field control system we have visualized, the stagnation point and vicinity, which is normally the most severely heated part of a supersonic vehicle, gets no heating at all. The field brings the air to rest at the stagnation point without any compresion (equation A4-10) and since it is the energy of compression that causes stagnation heating, there is no heating."
I cant see how this could be right. If there are forces in the air, that Hill calls force fields, then there is a relation to pressure according to f = - ∇p wich in combination with the ideal gas law pV=nRT or per volume p = RT/Vm where Vm is the molar volume becomes f = -R/Vm ∇T which means that a force field in air will affect the temperature. So there will be heating and cooling with force fields applied. You can see the temperature distribution on my arXiv article where I derive T1 = 210 M2 where T1 is Kelvin above ambient temperature and M is mach number. This is shape dependent and the formula is for a spherical object. The strange thing is that Hill on page 215 admits that there will be temperature changes due to the field he imagines. He mentions this as a way to explain an observation in 1968 at Vashon Island page 54 example III-B2 when a pond was found frozen after a flying saucer had left it. David David Jonsson, Sweden, phone callto:+46703000370
