The basic advantage to a gliding descent of piloted vehicles over the ballistic descent is that heating of the vehicle and the magnitude of the effective overloads can be diminished because of increasing the flight altitude and regulating its dependence on the deviations in heating and overloading during flight from the nominal values. Considered below from the viewpoint of assuring least heating is one of the possible methods of selecting and computing the fundamental portion of the flight trajectory in the dense layers of the atmosphere in which the greatest deceleration of the motion velocity occurs. The transfer portion from the atmospheric re-entry trajectory to the trajectory being investigated here will not be considered. The heat going into heating the satellite during its motion in the atmosphere is part of the work of the air drag. In a first approximation it may be assumed that the ratio between the energy going into heating the vehicle and the work of the drag is a constant. In this case it is expedient to take the motion at which the work of the drag per second is a constant along the principal part of the trajectory. Under the assumption made this assures a uniform distribution of the heat presented to the vehicle on the whole trajectory. (Author)


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