Fig. 138
Fig. 139
Figs. 136 to 139.—Arrangement and Details of Engine
[Fig. 136] gives a plan view of the engine, which is rotary with, of course, a stationary crank-shaft. The five cylinders are soft-soldered to what may be termed the crank-case, which consists of two circular brass discs of the gauge indicated. In order that the cylinders may be accurately located round the plates, a wooden jig should be made with slots to receive the cylinders, and a recess to take the plate. Five lightening holes are drilled in the two plates as shown. The front plate, that is, the one carrying the propeller bolt, is, however, left off until the pistons, crank-shaft, and sleeve are assembled.
Fig. 140.—Details of Crank
Fig. 142.—Connecting Rod