968 



HYDRODYNAMICS IN SHIP DESIGN 



Propeller(s), positions, for a ship design, 568 

 rotating-blade, "basket" diameter, 536 



design notes, 656 



test results on, 337 



values of real efficiency, 333 

 shafts, design of bossings for, 682 



exposed, fairing of, 744, 746 

 singing and vibration prevention, 636 

 surface, design of, 650 



swinging, for steering and maneuvering, 737 

 vibratory forces induced by, 877 

 PropeUer(s), screw, ABC ship, design of by Lerbs' short 



method, 611 



disc and hub diameters, 612 



final design, 628 



rake for blades, 612 

 area ratios, 340 

 blade(s), edges, shaping of, 606 



helix angles, 340 



prediction of cavitation on, 149 



sections, hollow-face, 627 

 selection of, 605 



strength of, 634 



widths, 340, 605 

 bow, design of, 632 



housing, design of, 797 

 cavitation criteria, 154 



inception and effect of, 145 

 characteristic curves, open-water test, 334, 878 

 contra-rotating, design features of, 655 



-struts abaft, layout of, 682 

 controllable, fist of references, 679 



performance data on, 338 

 » corrosion-resisting steel, to prevent erosion, 635 

 coupled, design of, 632 

 design, 582 



bibliography, 606-609 



charts, data from, 335 



circulation theory for, 609 



comments for supercavitating range, 631 



features, preUminary comments, 596 



Lerbs' short method of 1954, summary of, 630 



procedures, 583, 596 



requirements for, 583 



Schoenherr's combination of steps, 630 



to exert vertical and lateral thrust, 654 

 designed to operate under supercavitation, 631 

 diameter, selection of and optimum, 597 

 disc and hub diameters, 612 

 -disc clearances, 540 

 drawing the final design of, 629 

 efficiency, calculating expected, 629 

 estimate of characteristics for motorboats, 859 



thrust and torque variation per revolution, 348 

 expanded chord length from mean-width ratio, 340 

 feathering and folding, definition of, 651, 652 



design data for, 651 

 flow abaft a, 259 

 free-running bow, design of, 632 

 hollow-face blade, use and disadvantages of, 627 

 hubs, diameter, 601, 612 



fairing of, 745 

 hull surfaces abreast, 672 

 jet diameters, inflow and outflow, 342, 343 



Propeller(s), screw, materials to resist erosion, 635 

 mean-width ratio, formula for, 341 

 mechanical construction, 633 

 model, and ship, photos of cavitation, 153 



open-water test(s), 632, 876 

 data, 333, 878 

 in cavitating range, 153 

 in variable-pressure water tunnel, 334 



self-propelled tests with, 377, 632, 875 



stock, use of on self-propelled models, 592, 870 

 necessity for full submergence at all times, 500, 571 

 outflow jet, augment of velocity at rudder position, 707 

 performance, effect of cavitation, 152 



under supercavitation, 156 

 position, anal.vsis of flow at, 259 

 preliminary design with series charts, 592 

 reversible, performance data on, 338 

 revolution, variation of forces and moments per, 348 

 -series charts, comparison of, 589 



fisting of, 584-588 



requirements for, 584 

 shafts, design of bossings for, 682 



exposed, fairing enlargements around, 744 

 shrouding, fixed, design of, 687 

 single-bladed, comments on, 600 

 submergence in all operating conditions, 500, 571 

 submersion under variable-load conditions, 498 

 swinging, for steering and turning, design notes, 737 

 tandem, design features of, 655 

 thrust, approximation of from insufficient data, 346 



relation to load at thrust bearing, 347, 348 

 tip clearances for motorboats, 859 



submergence, adequate, 541 

 torque, unbalanced, compensating fins for, 699 



disadvantages of, 579 

 under-the-bottom, 653 

 values of real efficiency, 333 

 vertical drive for, 653 

 vibrating, estimated added-mass coefficients for, 436 



modes of motion, 437 

 vibratory forces induced by, 877 

 Voith-Schneider; see Propellers, rotating-blade 

 Propelling machinery, for double-ended vessels, 792 

 general assumptions, 443 

 location of in ship, 570 

 reserve of power, 574, 575 

 t.vpe and design, effect on hull, 570 

 underwater exhaust for, 545 

 Properties, mechanical, of air and exhaust gases, 922 



water, 915 

 fresh and salt water, 920 

 other liquids and gases, 924 

 Proportion(s), blade and paddlewheel, calculated, 641 

 chine, for planing craft, 837 

 chordwise sections, control surfaces, 722 

 hull, abovewater, for strength, wavegoing, 496 



of a surface ship, 464 



selection of for motorboat, 827 

 immersed-transom stern, 529 

 principal, second approx, 475 

 shape data, Great Lakes oreships, 758-760 



icebreakers, 800-803 



typical ships, 223-228 

 Propulsion, airscrew, 658 



