Shipbuilding and Shipping Record . ncipal experiments which have been to guide them than on experimental data. From considerationsmade and will show how propeller design can be proceeded with of the apparent slip the pitch is determined, and by using somefrom the data available. method of constants of performance, the appropriate diameter can July ]0, 1917. SHIPBUILDING AND SHIPPING RECORD. 5!) be given. In the present article the writer draws attention to the Basis of diagrams.—In the formulae adopted by Taylor in his accompanying sets of ciuvcs which be has developed and which will 1904 mode
Shipbuilding and Shipping Record . ncipal experiments which have been to guide them than on experimental data. From considerationsmade and will show how propeller design can be proceeded with of the apparent slip the pitch is determined, and by using somefrom the data available. method of constants of performance, the appropriate diameter can July ]0, 1917. SHIPBUILDING AND SHIPPING RECORD. 5!) be given. In the present article the writer draws attention to the Basis of diagrams.—In the formulae adopted by Taylor in his accompanying sets of ciuvcs which be has developed and which will 1904 model screw experiments an<l by Curtis and Hewins in theirsenable a ready check to be made on proposed dimensions to fulfill of 1905, P or propeller horse power = cSDV ; where c is a constant Figure 4Diagram giving approximate diameters ?? pitches of 3 blaqeq propellers for twin screw shipssee no. 5 for value appropriate to a given number of revolutions and stated propeller horse power or p. 85 or 97 s. 19 20 21 22 25 24- 25 26 PITCH IN FEET specified conditions of revolutions and power. These diagrams dependent on the number f ^^^^ f^^^^^^/^SIJZZhave been constructed from the actual trial results of scores of ships, dependent on real shp area and . D - dmmeterand their utiUty is demonstrated m the examples given later. and V = speed of ship corrected for wake. 60 SHIPBUILDING AND SHIPPING RECORD. July 19, 1917. Substituting for V, the above formula may be expressed thus :— THE MEASUREMENT OF SHAFT HORSE-POWER. cSD^ (101-3)3 therefore- R»~^^ (101-3)3 ? The propeller horse-powers obtained on the trials examined by the writer have been divided by , so that the values given on Viooy Figs. 1, 2, 3 and 4 are PHP* (or propeller horse-powers) for 100 revo-lutions for the complete range of propeller dimensions shown. Themethod of plotting adopted takes into account the diameter andpitch functions on the right-hand side of the equation,
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