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action angles augmented surface axial axis blade area cast iron cent centre centres of pressure circumference coefficient cubic foot curve cylinder Diameter of boss diameter of screw diminished direction discharged disk area displaced distance divided drawing eddies edge efficiency energy engines equal expanding pitch experiments flange fluid forward frictional wake Froude generatrix given greater gun metal horse-power hydrostatic pressure illustration immersed increased indicated thrust knots length less manganese bronze marine propulsion mass of water motion moving multiplied number of blades number of revolutions ordinates paddle paddle-wheel particles peller periphery perpendicular plane Plate pounds practical pressure propeller blades proportion quantity of water quotient radial radius resistance revolutions per minute screw blade screw propeller screw revolves ship ship's slip speed square inch steel stern post stream supply water surface friction tail shaft thread tion tips torpedo boat trial trochoidal true screw twin screws velocity vessel Washington Navy Yard
Page 92 - ... stream relatively to the ship in knots; the real slip, or part of that speed which is impressed on that stream by the propeller, also in knots ; and the constant 5-66/or sea-water, or 5-5 for fresh water.
Page 95 - Fig. 2, and if we were to draw a line through the intersection parallel to the base, the height which would be thus cut off from the thrust ordinates would represent the deduction to be made from them in respect of constant or initial friction, and the remainders of the ordinates between this new base and the curve, would, as has been explained, be approximately proportional to the ship's true resistance.
Page 192 - ... is the product of the following factors : — I. The area of the portion of the ship's skin in question. II. The cube of the ratio which the velocity of gliding of the particles of water over that area bears to the speed of the ship ; being a quantity depending on the figure of the ship and the position of the part of her skin under consideration. III. The height due to the ship's speed; that is, (speed in feet per second)2 ei^ (speed in knots)2 or, 22-6 IV.