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The Screw Propeller

The Screw Propeller


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About the Book

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1851 edition. Excerpt: ...LAW OF MOMENTS OF ENGINE. 33 Again--3 x Because cos. 6 =, ----see cor. (1) prob. (6), we shall have /8 n f (V) x j = = accelerating force in the direction of the vessel at a point x distance from the axis. And since all the points in the helix, whose length is V/3 x- + 2, are situated at the same distance x from the axis of the screw, we shall have n f (V) x = accelerating force in the direction of the axis of the screw, of the helix x distance from the axis. Then F--2 /3 n I f (V)xdx = accelerating force in the direction of the axis of the screw, of the helix x distance from the axis... (3). Put JR to represent the force in pounds avordupois, which is necessary to prevent the action of the screw-blades on the water from moving the vessel to which the screw is attached, when the engine is moving the screw with a uniform angular velocity w: Then R will be the measure of the accelerating force of both blades of the screw in the direction of the axis of the screw. Therefore we shall have, from equation (3), R = 20n/t(, V)xdx (4). Now, when the angular velocity of the screw is uniform, the accelerating force to drive the screw round must vanish; then equation (2) will become 2n h f f V) xdx (5). Ia: tk From the equations (4) and (5) we can eliminate the unknown integral f (V) x d x, and obtain the important relation /8 P R = ZA'TMh P 1A' TKh A' T K p R 0.. 2 A = r --Since / 3 =--A T K = jf, the moment of inertia of the screw blade. (6).... P- JL- (7). From this singular and important equation we may readily obtain the useful moment of the engine used to turn the screw-propeller round, by observing the value of R from experiment, and calculating the moment of inertia of the screw blade from problem (5). If the...


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Product Details
  • ISBN-13: 9781234375898
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 24
  • Spine Width: 1 mm
  • Width: 189 mm
  • ISBN-10: 1234375893
  • Publisher Date: 22 Jan 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 64 gr


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