Dimensional analysis has been applied to the computation of the main bearing of a V-type in-line aircraft engine. Charts are presented that give the maximum and mean hearing loads for the center, intermediate, and end main hearings at all values of engine speed to 5000 rpm and at all values of indicated mean effective pressure to 500 pounds per square inch. Two crankshafts have been considered, one designed for higher operating speed than the other. The individual effects of changes in compression ratio and in the ratio of connecting-rod length to crank throw upon the main-bearing loads are presented.nOptimum combinations of engine speed and indicated mean effec¬tive pressure were found to exist for which the mean and maximum main-beaming loads are minimums for a given power but such combina¬tions do not always lie in a practicable operating region.
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