976 



HYDRODYNAMICS IN SHIP DESIGN 



Telfer, merit factor for ABC ship, 895 

 Temporary bows, design of, 781 

 Tender, planing-type, for ABC ship, lines, 843 

 requirements for, 826 

 round-bottom, for ABC ship, hnes, 855 

 requirements for, 825 

 Tension, surface, and dynamic viscosity, 920 

 Terminal values t for DWL's, design lane for, 509 

 Termination of skegs and bossings, 684, 747 

 Testing program, model, for a large ship, 868 



techniques for wind-resistance models, 278 

 Tests, controllability, of model in shallow water, 876 



model; see Model 

 Theoretical surface waves, data on, 160 



wave patterns on water surface, 160 

 Thickness, blade-, radial distribution for screwprop, 620 

 boundary-layer, variation with x-distance, 95, 96 

 laminar sublayer, in turbulent flow, 104, 120 

 variation with length and speed, 105 

 Three-component complex sea, delineation of, 172 

 -dimensional flow around rod and sphere, 41 

 stream functions, diagram of, 41 

 wake-survey diagrams, 360 

 analysis of TMB, 362 

 -screw installations, notes on, 521 

 Thrust, bearing, rel bet screwprop thrust and load at, 347 

 calculation for a propeller, 347 



-deduction fraction, determination by model tests, 879 

 estimate by "cylinder" method, 372, 373 

 for ABC ship, 542 

 of, from hull shape, 542 

 predicting, 369-371 

 prediction of W. J. Luke, 369 

 minimum, design for, 541 

 distribution, radial, of screwprop, 615, 616 

 due to water-surface slope, estimate of, 321 

 -load coeff, variation per rev, for a screwprop, 349 

 when towing, 346 

 ■5\ath ship speed, 344-346 

 factor, calculating, for a screwprop, 613 

 data derived from, 345 

 measured, on ships, 310 

 screwprop, and thrust-bearing load, rel bet, 347, 348 



estimating from insufficient data, 346 

 slope, estimate of, 321 



transv and vertical, design of devices producing, 654 

 var per rev for screwprops, est of, 348, 350, 351 

 Tideman friction-resistance data, 103 

 Tip clearances, for propdevs, 537 



of propellers for motorboats, 859 

 submergence of screwprops, adequate, 541 

 Titles of symbols used, 900 

 Torpedoboats, old, general data on, 753 

 Torque, coeff, variation per rev on a screwprop, 350, 351 

 -compensating fins, design of, 699 

 unbalanced, of a propdev, disadvantages, 579 

 variation per rev for screwprops, est of, 348, 350-352 

 Towing, emergency, temporary bow for, 781 



pulls on ships, measured, 310 

 Tracked vehicles as amphibious craft, 806 

 Tracks, paddle; see Paddletracks 

 Trail or street, vortex, 6, 141, 142 

 Trailing edges of appendages, design of, 675, 676 

 Transformation, conformal, description and uses of, 25 



Transition, gradual, abaft elliptic 3-diml nose, 196 



sharp, between portions of VVL's, 197 

 Transom stern; see Stern 



Transverse dimensions for shallow-water running, 662 

 discontinuities, above water, 561 

 force tests on models, in rudder tests, 716, 717 

 moment-of-area coefficient for DWL, selecting, 478 

 thrust, design of devices to produce, 654 

 waves, effect on calculated resistance, 220 

 Trials, ship, limiting depth of water for, 407 

 Trim, and displ, effect of changes on resistance, 310 



draft variations, ABC ship, due to variable 



weights, 481, 498 

 resistance data for torpedoboat in shallow water, 



390 

 sinkage on models, 874 

 angle for planing craft, 840 

 change of, effect on effective power, 355 

 for fat forms, 329 



towed and self-propelled models, 327 

 in open, deep water, data on, 325-328 

 shallow and restricted waters, 328 

 on models, towed and self-propelled, 327, 874 

 with speed, 325 

 -control devices, use of for planing craft, 840 

 data, typical shallow-water, 390 

 diagram, running, for ABC planing-type tender, 849 

 propeller submersion and, under variable load, 498 

 Trimarans; see Catamarans 

 Triple-screw vessels, typical shapes of, 237, 238 

 Trochoidal wave(s), deep water, data on, 166 

 definition drawing, 162 

 elevations and slopes of, 163, 164 

 lengths, periods, velocities, 165-168 

 orbit radii, change with depth, 169 

 orbital velocity in deep water, 162, 166, 168, 169 

 profile, ordinates for, 163 

 sketch of surface slopes, 164 

 system, formulas for, 162, 163 

 theory, summary of, 161 

 Troost and Lap friction-resistance formula, 104 

 Trough; see Wave(s) 

 Tsunami or earthquake wave, 181 

 Tubular rudders, conditions calling for, 726 

 Tufts, model flow observations with, 874 

 partly reversed, view of, 137, 139 

 use of for determining flow, 137, 254 

 Tug, fleet, displ of appendages, 296 

 Tumble home, design data for, 551 



Timnel(s), in multiple-skeg sterns, design notes, 531 

 oblique, in shallow-water craft, 670, 671 

 stern (s), craft, powering, 672 

 design of, 669 



vessels, bibliography on, 673, 674 

 Turn of ship in loose or tight circle, 6 

 Twin-screw body plans, 236 



vessels, stern forms for, 520 

 Two or more solutions to equation of motion, 6 

 types of flow or performance, 6 

 per cent resist increase, limiting depth for, 404 

 speed reduction in water of given depth, 403 

 Type(s), huU, selection of for motorboat, 827 

 propeUing machinery, effect of, 570 

 roll-resisting keels, selecting, 691 



