. Airborne radar. Airplanes; Guided missiles. 686 MECHANICAL DESIGN AND PACKAGING 1400. MACH NUMBER Fig. 13-2 Stagnacion Air Temperature vs. Flight Speed and Altitude. earth's surface. Since, however, the factor of transmissivity of solar radiation through the earth's atmosphere is a variable, it is feasible and conservative to consider the maximum solar radiation constant of 429 Btu/ft^/hour to obtain for all design conditions, ground operations as well as flight conditions. Therefore, the actual rate of heat transfer to the aircraft or body skin by solar radiation (resulting in a
. Airborne radar. Airplanes; Guided missiles. 686 MECHANICAL DESIGN AND PACKAGING 1400. MACH NUMBER Fig. 13-2 Stagnacion Air Temperature vs. Flight Speed and Altitude. earth's surface. Since, however, the factor of transmissivity of solar radiation through the earth's atmosphere is a variable, it is feasible and conservative to consider the maximum solar radiation constant of 429 Btu/ft^/hour to obtain for all design conditions, ground operations as well as flight conditions. Therefore, the actual rate of heat transfer to the aircraft or body skin by solar radiation (resulting in an increase of internal compartment temperatures) is the product of the solar radiation constant, the absorptivity of the body surface, and the surface area. For purposes of calculation, the surface area used should be only that area exposed to the sun's rays. The temperature effects of solar radiation should be added to the effects of aerodynamic heating and equipment heat in order to establish the total temperature of the compartment housing the electronic equip- ment. Solar radiation is a large percentage of the total load for that phase of the equipment life concerned with ground operation. This is especially true during the nonoperating phase of the equipment, since the total compartment ambient temperature is then determined by the effects of solar Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Povejsil, Donald J. Princeton, N. J. , Van Nostrand
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