Dimensional Studies of Lightweight Motors for Aircraft

The study of what happens to the proportions of a machine as the size of the machine is changed not only is interesting to imaginative engineers but also is very useful in teaching the engineer how best to standing the relationship which exists between size and any desired useful characteristic, it is possible to make better use of experience which has been obtained on machines of different output in determining the probably best proportions of a new device. It is the purpose of the present paper to point out how relatively complicated similar to dimensional analysis for the purpose of establishing such relationships as output per pound or output per cubic inch. Obviously, the conclusions which will be reached by such a study will be different as different original assumptions are established and it is therefore important to determine carefully what limitations on machine performance are really fundamental. Once such assumptions have been established soundly, it seems possible to arrive at very useful dimensional-analysis conclusions in connection with relatively complicated machines.