Accession Number : AD0655959

Title :   HYDRODYNAMIC FORCES ON AN ANCHOR CABLE,

Corporate Author : DAVID TAYLOR MODEL BASIN WASHINGTON D C

Personal Author(s) : Landweber,L.

Report Date : NOV 1947

Pagination or Media Count : 14

Abstract : The holding power required of an anchor for a ship anchored in shoal water with a length of anchor line at least five times the water depth, i.e., with a scope of five, can normally be assumed to be equal to the estimated drag of the ship. Anchoring in deep water necessitates a relatively shorter anchor line, which results in a considerable hydrodynamic force on the anchor cable and a tension in the cable much greater than the drag of the ship. Curves were computed from which the magnitude and direction of the tensions in the anchor cable can be determined when the drag of the ship, the velocity of the current, the depth of the water, and the type and length of the anchor cable are known. Formulas are given for ship drag, current parameter, breaking strength of wire-rope and chain cables, safe working loads on cables, and holding power of an anchor. An illustrative example applies these calculations to the determination of diameter and length of a wire-rope anchor cable and of size of anchor required in a given problem. (Author)

Descriptors :   (*MECHANICAL CABLES, *HYDRODYNAMICS), (*ANCHORS(MARINE), MECHANICAL CABLES), SHIPS, FORCE(MECHANICS), DRAG

Subject Categories : Marine Engineering
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE