. The record. 2, a single screw acts con-siderably more in the water drawn after the vessel than a twin-screw: see Fig. 3. The four-bladed propeller more than the three-bladed: compare Figs. 1 to 6. From this follows, that the pitch anduseful effect, as shown in Fig. 1, is considerably more influenced bythe water drawn after the vessel than in the propeller shown in In this respect the efficiency of three blades in a twin-screw isnearly equal to that of a three-bladed screw for a torpedo boat, whichin proportion to the vessel is brought lower down: see Figs. 5 and 6. In designing propel
. The record. 2, a single screw acts con-siderably more in the water drawn after the vessel than a twin-screw: see Fig. 3. The four-bladed propeller more than the three-bladed: compare Figs. 1 to 6. From this follows, that the pitch anduseful effect, as shown in Fig. 1, is considerably more influenced bythe water drawn after the vessel than in the propeller shown in In this respect the efficiency of three blades in a twin-screw isnearly equal to that of a three-bladed screw for a torpedo boat, whichin proportion to the vessel is brought lower down: see Figs. 5 and 6. In designing propellers, first of all, it is necessary to settle on thediameter and the number of revolutions. According to experiencethe diameter must be adapted to the vessel, and the number of revo-lutions cannot be assumed at will, because small and high speedengines would not be placed in large vessels, and vice versa. As astarting point, the area of the screw disk is made a certain ratio ofthe immersed midship section D27T.
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