xii CONTENTS 



CIlAITICll oS— UrNMXC.-ATTrn 1)K AND SHIP-MOTIUN DIAGRAMS— CoiUimu-d 



58 4 DatA on Sinkngo and Change of Trim iu 58 Variation of Attitude and Position of Planing 



Shallow and Restricted Waters 328 Craft with Spceii and Other Factors . . . :J29 



58.5 ChanRis of Attitude and Trim of Sliips with 58.7 References to Published Uat^i SM 



Fat Hulls 320 



CHAPTER 59-PREDICTIX{; 



:i!I(>l!MA\CE OF PROPULSION DEVICES 



59.1 

 59 2 

 59 3 



59.4 



59.5 



59.6 

 69.7 

 59 8 



59.9 



Relationship to Other Chaptor.i i>;i:2 .j'.l 10 



I'^timatvof Propulsion-Dcvioc KITioienoics . 332 

 Open-Water Test Data for Model Screw 59.11 



Propellers 333 



Performance Data from Scrcw-PropcUer 59.12 



Design Charts 335 



Performance Dat:i on Puddlcwheels and 59.13 



Sternwheels 335 



Bibliography on Puddlewheels 335 59.11 



Test Results on Rotating-Blade Propellers 337 59.15 



Available Performance Data on Hydraulic- 

 Jet, Pump-Jet, and Gas-Jet Propulsion 59.10 



Devices 337 



Performance Data on Controllable and Re- 338 59.17 

 versible Propellers 



Performance of Miscellaneous Propul.sion 

 Devices .339 



.\rea Hntios, Blade Widths, and Blade-Heli.x 

 .■\nglesof Screw Propellers 341) 



Pertinent Data on Flow Into Propulsion- 

 Device Positions 341 



Data on Induced Velocities and Differential 

 Pressures 343 



The Thrust-Load Factor and Derived Data 345 



.•\pi)ro.>;imation of Screw-Propeller Thrust 

 from Insuflicienl Data 346 



Relation Between Thrust at the Propeller 

 and at the Thrust Bearing 347 



Estimates of Thrust and Torque Variation 

 per Revolution for Screw Propellers . . . 348 



CHAPTER 60— SHIP-POWERIXG DATA FOR STEADY AHEAD MOTION 



60.1 General 354 



60.2 Estimation or Calculation of Effective and 



Friction Power 354 



60.3 Effect of Displacement and Trim Changes 



on Effective Power 355 



60.4 Methods and Factors Involved in Predicting 



Shaft I'ower 358 



60.5 Axial-Component W'ake-Fraction Diagrams 



at Propulsion-Device Positions 358 



60.6 Three-Dimensional Wake-Survey Diagrams 300 



60.7 Interpretation and Analysis of the TMB 



Three-Dimensional Wake Diagram . . . 302 



60.8 Estimating the Ship-Wake Fraction .... 308 

 tXJ.9 Prediction of the Thrust^Deduction Fraction 370 

 tJO.lO Finding the Relative Rotative Efruiency . . 374 



60.11 Determination of the Propulsive Coefficient . 375 

 00.12 Data from Self-Propulsion Tests of Model 



Ships and Propellers 377 



60.13 Merit Factors for Predicting Shaft Power . . 380 



60.14 Shaft-Power Estimates by the Ideal-Effi- 



ciency Method 383 



00.15 Estimating Sliaft Power for a Fouled- or 



Rough-Hull Condition 385 



00.10 IiiiTcasing the Power and Speed of an 



Existing Ship 387 



00 17 Powering for Two or More Distinct Operat- 

 ing Conditions 388 



OU.IS Backing I'ower from Self-Propelled Model 



Tests 388 



CHAPTER (il— THE PREDiCTIOX OF SHIP RE1IA\ lOR IX COXFIXED WATERS 



01.8 



General 



Typical Shallow- Water ResisUmce Data . . 



The Quantitative Effect of Shallow Water 

 on Shij) Resistance and Speed in the 

 Subcritical Range 



The Square-Draft to Water-Depth Rjitio . . 



Features Associated with the.O. Schlichting 

 Procedure 



Practical Cases Involving a Given Depth of 

 WaU-r 



Case la; To Find the Shallow- Water Speed 

 from the Ucep-Water Resistance-Speed 

 Data 



Cniie lb; To Find the Shallow-Water Resist- 

 ance from the Dee|>-Water Resistance- 

 SjKwl Data 



38'.) 

 389 



390 

 393 



31)1 

 390 



01 .'.) Case Ic; To Find the Deep-Water SpectI and 

 Resistance When the Shallow-Water 

 Speed and ResisUmce are Measured . . . 4tK) 



01 . 10 Limiting Case of 2 Per CVnt Speed Reduction 



ill Wat<-r of a Given Depth 403 



01.11 (';is(s 2a and 2b: To Find the Limiting 

 1 )epth for a 2 Per Cent Increase in Re- 

 sistjince 404 



01 12 I). W. Taylor'.s Criterion for the Limiting 



1 )cpth of Wnl4T for Ship Trials 407 



(il 13 Predicted Shallow-Water Resistance by 



Inspection 408 



61.14 Calculating and Using the Hydniulic Radius 



of Channels 4(19 



01 15 Estiii\uting the Effect of Ijitoral Restrictions 



in Shallow Water in the Subcritical Itingi' 410 



