Airplane Body (Non Lifting System) Drag and Influence on Lifting System
The present Division is concerned with those features of the airplane structure which, though necessary from the requirements of structure, purpose and utility, may be and usually are harmful from the standpoint of aerodynamic efficiency. Under the conditions of conventional design an airplane has a body for the accommodation of a power plant and for pilot, personnel and pay load; and likewise a landing gear to enable it to take off from and return safely, to the ground. Structurally it will have combinations of struts, wires, etc., as required for strength, but which take relatively a heavy toll in terms of increased drag and its consequences.
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