Theoretical Naval Architecture

Theoretical Naval Architecture

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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. 1877 edition. Excerpt: ...these points more minutely in a future chapter. The length of GZ at any angle being the lever of statical stability at that inclination, if ordinates be set off from a base line so as to represent to scale the successive values of GZ at the different angles of heel between the upright position and 90 degrees, the abscissae representing to scale the angular intervals between the inclinations at which GZ is calculated, then a curve passed through the extremities of these ordinates is termed a "curve of statical stability." When this curve is drawn, the length of the ordinate at the point on the base line corresponding with any given angle--read by the proper scale--multiplied by the displacement, gives the moment of the righting or upsetting couple at that angle. The units employed are usually a foot and a ton. In constructing the curve, positive values of GZ are set off above the base line, and negative values below. Plate XXV. shows curves of statical stability for the several classes of ships named; these may be regarded as types of the various kinds of curves that occur in practice. An examination of these curves will prove very instructive to an experienced eye, as they reveal certain important facts in connection with the form of the ship, and height of the centre of gravity, and enable the naval architect to predict with certainty regarding the power of the ship to stand up under sail. Table VII. contains specimen calculations for ordinates of a curve of statical stability which are similar to the calculations for the surface statical stability at a finite angle which are given in Table II. The calculations shown in Table VII. are extracted from the appendix to the paper by Messrs. White and John, contained in Vol. XII. more

Product details

  • Paperback | 120 pages
  • 189 x 246 x 6mm | 227g
  • English
  • Illustrations, black and white
  • 1236765672
  • 9781236765673