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Erich Hartfield con How to Assemble and Construct Your Own Airplane (Home Flight Construction Book 1) (English Edition)
An airplane is designed to withstand the strains put upon it by the work which it is called upon to do. It is a machine of accurate yet delicate construction and great care must be taken that no undue strains are put upon it. An airplane rigger must necessarily have a fine conception of where any heavy strains may be placed upon it without causing distortion or breakages to its structural parts. To the average layman, an airplane is a solid mechanical structure, and he has no preference in lifting any part of it, other than that of convenience. Some machines are marked with arrows denoting the points at which loads may be applied, but it is necessary for any airplane rigger to have a thorough knowledge of all these points and the reasons why loads may be applied at same. Frequently the machines have no load marks whatever and the aviation mechanic must naturally use his own judgment.