366 



HYDRODYNAMICS IN SHIP DESIGN 



Sec. 60.7 



Vectors Shown are 

 Projections of 

 Actual Velocit\( 

 Rectors on 

 Jronsverse 

 meter/r\\pione 



v-20.5 kt T„- 0. 



Sh ip Side 

 Designed Woterline 



5hlp Centerline 



Section at Sta. 19.18, opposite 



Propeller Disc 

 .330 



Numerals 

 Indicate 

 Wake Froctions 



Fig. 60.K Wake-Survey Diagram for a Torpedo 

 WITH Vertical and Horizontal Tail Fins 



55.9,18,2^ ,,_^ 



79.3,6.4| 

 ' 10.255 ft 

 35.5J8.7 1 I tot 



74.6,4-.6y 

 7452 ft 



^ 4- 



't 4.1 9.4 5.3,£ 



4.4,10.1 R 



these features were discovered during the con- 

 struction period and corrected by hull changes 

 before the vessels were launched. 



There are a number of methods of quantitative 

 analysis, by which magnitudes and variations of 

 wake velocity are set down in graphic or tabular 

 form. Several of these are illustrated in the -pio. 60.M Wake-Survht Diagram for Transom- 

 references given in Sec. 60.5 for the plots of Stern ABC Ship, TMB Model 4505 



longitudinal wake-velocity or incident-velocity 



components. As described in Sec. 11.8, the (1) A series of radii is selected and the circum- 

 analyses take account of either radial or circum- ferential values for each radius are averaged, or 

 ferential variations when: (2) A series of angular positions is selected and 



-Plane of Diagram on Poge 

 Transverse ^°°°**=s==^ L^ertical 



Ship Plane 



Vector on Wake. 

 Diagror 



Aciual 

 a Velocitvy Veclor 

 \" "i of Liquid 



^ ^--Transverse Slope 

 of Vector 

 ,Vector and Numerals on 

 Woke Diogram 



Fore- and- Aft , | 

 Componenls -__f \°t 

 of Actuol 



Velocity E 



Vectors 



2nJ Numeral is Length of Tronsverse 



Component on Percentage Scale 



Fig. GO.L DEriNiTioN Diagram for TMB 3-Diml Wake-Subvev Diagrams 



