Courtesy Reuters

THE performance of airplanes, whether military or civil, is primarily a problem in distribution of weight. Speed depends on the weight that can be devoted to power-plant. Range depends on the weight of fuel that can be carried. The capacity to reach great altitudes depends, again, on the weight that is put into power-plant, and on the extension of wing surface. Manœuvrability calls for weight assigned to the same purposes as climbing ability. Fighting power, in the case of military airplanes, demands the expenditure of weight on guns, bombs, ammunition, sights and armor. Yet the demands of all these

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