c:()N rr;\ IS 



niAi'iiiK 



Tin: l'l;l•;I.I.\ll^Ali^ iivDitonvNAMic" dksicn of a MontiiUoAT 



1 Scope of This Chapter 819 



2 General Considcmtions Rcluting to Motor- 



boat DesiRn 820 



3 S|)oci!il ncsinn Features for Small-Cnift 



Hulls 822 



. -I Ppsikh Notes for Displacemcnt-Tj'pe Motor- 



l>0!its 823 



5 Scmi-rinniiig and Planing Small Cnift ... 823 



6 Operating Requirements for Planing Forms . 824 



7 Gcncril Notes on the Powering of Small Craft 824 



8 Principal llequirementa for a Preliminary 



Design Study 825 



".I .Viialysis of the Principal Requirements . . . 826 

 in Tentative Selection of the Tj-po and Propor- 

 tions of the Hull 827 



1 1 First Space I.,ayout of the 24-Knot Planing 



Hull 827 



12 First Weight Estimate; Weight-Estimating 



Procedure 828 



13 Second Weight E.stimato 831 



.14 First .\pproximation to Shaft and Brake 



Power 832 



.15 Selecting the Hull Features; Section Shapes . 835 



.16 Risc-of-Floor Magnitude and Variation . . 83C 



.17 Chine Shape, Proportions, and Dimensions . 837 



18 Buttock Shapes; The Mean Buttock .... 839 

 . 19 Trim .\nglc and Center-of-Gravity Position; 



Useof Trim-Control Devices 840 



.20 Spray Strips 841 



.21 Stem Shape 842 



77.22 

 77.23 

 77.24 



77.25 

 77.26 



77.28 



77.29 

 77.30 



77.33 



77.34 

 77.35 

 77.36 

 77.37 

 77.38 

 77.39 

 77.40 



77.41 



Deep Keel and Skeg; Other .\ppendage8 . . 842 



Interdependence of Hull-Design Features . . 843 

 I.,ayout of the Lines for the ABC Planing- 



Type Tender 843 



Design Check on a Basis of Chine Dimensions 846 

 Second Estimate of Shaft Power, Ba»c<l Upon 



Effective Power 847 



Running Attitude and Fore-and-Aft Position 



of the Heavy Weights 850 



First Space T^ayout of the 18-Knot Round- 

 Bottom Hull 852 



First Weight Estimate for the 18-Kiiot Hull 853 

 First Power Estimate for the 18-Knot and 



14-Knot Conditions 853 



Selecting the 18-Knot Hull Shape and 



Characteristics 854 



Layout of the Lines for the ABC Round- 

 Bottom Tender 855 



Example of a Modern Round-Bottom Utility- 

 Boat Design 858 



Design for a Motorboat of Limited Draft . . 858 



Estimate of Screw-Propeller Characteristics 859 



Propeller Tip Clearances; Hull Vibration . . 859 



Still-Air Dnigand Wind Resistance .... 862 



Design of Control Surfaces and Appendages . 862 



Third Weight Estimate 863 



Self-Propellod Tests for Models with Dy- 

 namic Lift 864 



Partial Bibliographj' on Motorboats .... 865 



C'll.\l'li:i; 7S MoDEI^TESTING PROGRAM FOR A LARGE SHIP 



78.1 Preliminary 8G8 78.11 Neutral Rudder .\ngli' iind Maneuvering 



78 2 Model-Test Data Desired for a Major-Ship Tests 



Design 868 78.12 Controllability Tests in Shallow Water . . 



78 3 Model-Test Notes for Preliminary ABC 78.13 Wavegoing Model Testes 



Designs 869 78.14 Vibratory Forres Induced by the Propeller . 



78.4 Use of Stock Model Propellers for First Self- 78. 15 Reporting and Presenting .Mwlel-Test Data 



Propulsion Tests 870 78.16 Test Results for Models of the ABC Ship . . 



78 5 Displacement and Draft Conditions .... 871 78.17 Comments on Model Tests and Analysis of 



78 6 Resistjinee Tests 872 Data 



78.7 Wave Profiles and Lines of Flow 873 78.18 Proposed Changes in Final Design of ABC 



78.8 Flow Observations with Tufts; Sinkage and Ship 



Trim; Wake Vectors 874 78.19 Comments on Illustrative Preliminary-De- 



78 9 Sclf-Proi)elled Tests 875 sign Procedures of Part 4 



78 10 Open-Water Propeller Tests 876 



876 

 876 

 877 

 877 

 877 

 879 



898 



APPENDIX 1 Symbols and Their Titles 



Al'i'KNDIX :i Mcchanieal Properties of Water, Air, aiui Other Media 



APPENDIX 4 Uaoful Data for Analysis and Comparison 



PERSONAI^NAME INDEX 



SHIP-NAME INDEX 



SL'HJECT INDEX 



900 

 915 

 926 

 933 

 911 

 918 



