Buy Theoretical Naval Architecture. Text. (Plates). by Samuel James P Thearle
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Theoretical Naval Architecture. Text. (Plates).

Theoretical Naval Architecture. Text. (Plates).


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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated.1877 Excerpt: ... Let AC2 be an ordinary rudder of the same area as the balanced rudder, and of the same breadth B. P2 is its centre of pressure, and GR2 is the arm of the turning couple; hence the turning moment in this case is proportional to B.V2 sin2 i cos ixp.fi. Now pG and p2G are practically equal, hence the turning moments of the two rudders are practically the same. This is on the supposition that the stream of water inpinging on the rudder meets it under similar circumstances, that is, leaves the surface of the after body with the same direction and velocity. This latter is purely an experimental question, and was answered in the affirmative by Admiral Key in 1803. Next, we have to consider the relative forces required to turn the rudders to the same angle. The stress on the rudder head in the case of the balanced rudder depends upon the position of the axis. The best position as determined by Admiral Key's experiment was at one-third the breadth of the rudder from the forward edge. CC Hence if A C1 is equal to the turning moment at the rudder head to get it over to an angle 6 is proportional to B.V2 sin" fxlBsV sin2 . 6 6 Now, the moment to turn the ordinary rudder is readily seen to be =J B2V2 sin2 I. Hence three times the power is required to get the ordinary rudder of breadth B to the angle 6 that is required for the balanced rudder of the same breadth and same efficiency, with its axis at one-third its breadth from the forward edge. It is obvious that the stress at the rudder head diminishes as the axis approaches the middle of the rudder, and supposing the pressure exerted by the particles to be uniform throughout the breadth of the rudder, there would be no more force required in turning than is necessary to overcome the inertia of the rudder. "We shou...


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Product Details
  • ISBN-13: 9781235821844
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 108
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 1235821846
  • Publisher Date: 08 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 209 gr

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