SUBJECT INDEX 



957 



Drag, data for hydrofoil planforms and sections, 83 

 due to ice, as for icebreal<ers, 794, 796 

 exposed rotating shafts, 293 

 fiat plates and discs, 291 

 friction; see Friction 

 hydrofoil, formulas for calculating, 72 

 keel, design of hull with, 543 

 modifications for appendages abreast, 293 

 pipes for suction dredges, 777, 778 

 predominant type, classification of appendages by, 



290 

 rigging, design to reduce, 566 

 separation, estimate and approx of, 139, 321 

 slope, estimate of, 321 

 still-air, of motorboats, 862 

 wind, irregular structures, formulas for, 276 

 lateral, 285 



masts, spars, and rigging, 566 

 with wind on bow, 281 

 Drawing, final design, ABC screw propeller, 628 

 streamlines, various methods of, 31 

 the final design of screw propeller, 629 

 Dredges, self-propelled, special design problems, 777 

 Drift and leeway, estimated, due to wind, 286 



-resisting keels, design of, 695 

 Drive, vertical-shaft, for screw propellers, 653 

 Dry-cargo vessels, design of, 762 

 Drydocks, floating, self-propelled, 779 

 Ducts and channels, refs to flow patterns in, 36, 37, 39 



passages, friction data for water flow in, 105 

 DUKW amphibian, peacetime uses of, 806 

 Djmamic forces, equilibrium of static and, on submarine, 

 812 

 lift, and planing, quantitative data, 263 



coefficient of planing form, graph for, 265 

 determination of, 264 

 self-propelled motorboat models with, 864 

 metacentric stability, check of, 553 



definition of, 443 

 viscosity, and surface tension, 920 

 reference data on, 94 



Earthquake wave or tsunami, 181 

 Echo-ranging gear, design notes for locating, 705 

 Eddies, circulation strength of, in streets or trails, 142 



references to flow photographs of, 37 

 Eddy frequency, definition sketch for, 16 

 relations for vortex trails, 142 



systems, references to, 144 

 Eddying, separation, and vortex motion, reference data, 



133 

 Edges, leading and trailing, design of, 675, 676 



screw-propeller blade, shaping of, 606 



to prevent singing and vibration, 636 

 Effect, and inception of cavitation on ships and props, 145 



scale; see Scale 

 Effective power; see Power 



wake fraction, definition of, 615 

 Efficiency, ideal, shaft-power estimate by use of, 383 



propdev, estimate of, 332 



real, propeller, variation in. 333 



relative rotative, estimate of, 374 



screwprop, calculating expected, 629 

 Elastic characteristics of water, 922 



Electric analogy, delineation of flow patterns by, 49, 67 



bibliography on, 50 

 Electroanalogic methods, 51 

 Electrolytic tank arrangements, 49 



for drawing streamlines, 31 



technique, 50 

 Element, straight-; see Straight 

 Elliptic ellipsoids, definition of, 43 

 Elliptic ellipsoids, flow around, 43 



nose outhne, formulas for, 196 

 Emergence points, faired shafts at, 746 

 Emergency running, temporary bow for, 781 

 Empirical data, use of in modern ship design, xix 

 Endings, bossing, hull, skeg, design of, 536 



contra-guide skeg, design of, 532 

 Energy, in surface-wave system, calculation of, 163 

 Engines, number and position of, 570 

 English-metric conversion ratios, 928-930 

 English system, units in, 926 



units of measurements, ratios between, 926 

 Enlargements around propeller shafts, fairing, 744 

 Entrained water, added mass of; see Mass 

 Entrainment, air, precautions against, 747 

 Entrance, angle of designed waterline, 479 



selection of section shapes in, 515 



vee, pressure distribution along, 48 

 EPH streamlined section (Ellipse-Parabola-Hyperbola), 



678 

 Equal-velocity contours; see Isotachyl 

 Equalizing powers for multiple screw propellers, 573 

 Equations, and formulas, pure, use of, xx, 7 



of motion, multiple solutions to, 6 



summary of general 0-diml, for ship forms, 192 



0-diml ship-surface, application of, 191 

 Equilibrium, static and dynamic forces, for submarine, 812 

 Erosion, cavitation, prediction and prevention of, 156 



propeller, coating and materials to resist, 635 

 Estimating, added-mass coefficients for vibrating ships 

 and propdevs in confined waters, 433, 436 



added mass of water in unsteady body or ship motion, 

 417 



air and wind resistance of ships, 274 



bow-wave heights and positions, 244 



draft variations, 481 



drift and leeway due to wind, 286 



effect of lateral channel restr in subcritical range, 410 



effective and friction power, 354 



flow at propdev positions, 258 



pattern for light or ballast conditions, 256 



forces on a moored ship, 287 



hull volume, first approx, 471 



metacentric stability, first, 478 



power, first approx, for round-bottom motorboat, 853 



propdev efficiency, 332 



resistance of discontinuities, 294 



screwprop characteristics for motorboats, 859 

 thrust from insufficient data, 346 



shaft power, second approx, for planing craft, 847 



ship-wake fraction, 368 



stern-wave heights, 245 



thrust and torque variation per rev for screwprops, 348 



total resist for submerged and surface ships, 313 



weight, first approx, 463 

 for planing craft, 828 



