. The record. \*-*--L-4z600 4 Erratum :—The above should read A, = X A. 56 THE RECORD. The diameter of the boss for a four-bladed screw may be taken to Xd; for a three or two-bladed screw 3Xd The boss isfitted conically to the shaft and tightly secured by a nut. To trans-mit the turning moment one or two feathers are let into the conicalpart of the shaft. The conicity, referred to the diameter of the shaft,should not be less than 1:12, otherwise the boss cannot be removedwithout much labor; it is generally about 1 : 10. The weight of a propeller can only be approximately expres
. The record. \*-*--L-4z600 4 Erratum :—The above should read A, = X A. 56 THE RECORD. The diameter of the boss for a four-bladed screw may be taken to Xd; for a three or two-bladed screw 3Xd The boss isfitted conically to the shaft and tightly secured by a nut. To trans-mit the turning moment one or two feathers are let into the conicalpart of the shaft. The conicity, referred to the diameter of the shaft,should not be less than 1:12, otherwise the boss cannot be removedwithout much labor; it is generally about 1 : 10. The weight of a propeller can only be approximately expressedby a formula; it consists of the weight of the boss and that of A = helicoidal area of blades in square feet; S = thickness of blade measured near the hub in feet; y = specific gravity of material. Then we have as the weight of the propeller Q = rXAX^. In case the blades are made detachable, add flange to this. If blades and boss are cast together, then the weight (Qx) may betaken at to Q; if blades are detachable, then take weight(Qu) at to 0
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