Abstract
OF THE MANY TASKS with which an aircraft designer is daily faced, one of the most tiresome is the trialaiid-error selection of structural sections, frequently, requiring many repetitions of time-consuming computations. In many cases it takes a considerable amount of labor to find a section which is just satisfactory, and a good real more to find the most efficient one. One such problem is the design of built-up spars for wooden aircraft. To assist in this case, a chart is presented by means of which allowable bending moments can be rapidly determined for spar sections of the types commonly used. To aid in shear strength calculations, values of Q/I are also given. A section ' 'efficiency'' is defined on the basis of resistance to bending, and some typical graphs of this quantity are given.
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