860 



HVDRODVN.\i\riC,S IN SHIP DESIGN 



Srr. 77 Jf^ 



RATE OF ROTATION, revolutions per minute, LOCATOR 



RATE OF ROTATION, 



REVOLUTIONS PER MINUTE, 



SELECTOR 



\n o "O o 



in O lo O 

 pO * "T >0 



I I II llllillllllllllll I I I I I Mil llllllllllllllll I I I I I I I I I III ll ihlll M I I I II I ll II II hllllllllllllll I I II I I III lllllllllllllll |g\ 

 Tdi iQ.n I I I I 10 I7S>' 



V-TTV^^i^r ' ''^-''tTTi r^TTTVk'k 



CAVITATIN& gPM IN HUNDR|DS 



O "1 -, 

 _ Ki oj evil 



liiiiiiiiil 1 1 1 1 1 liMiliiiiliiii III 1 1 liiiilni I In 



PITCH, INCHES 

 P <T> OD r~ lo ui -r 



. hhllll I I I I I 



MAJOR AXIS 



MEAN- WIDTH 

 O O/ O 

 io vy rt 



I |MM|MI,M,II|I 



DOOQO OO O o 



I I I I I I I I jlllljllll I II I I I M I I I I I I I 



o o >n V S) Q 



ni ui 



•(§)©(§)© 



RATIO FOR CAVITATION 



0© 



, , , I I I I I I — I — r 

 iLm I" 



MMI|IIII|IIII| lllll I I I I I 



o <Ti a> '^ (o lo 



SPEED OF ADVAjNCE, miles per hour 

 PITCH-DIAMETER RATIO for MAXIMUM EFFICIENCY 



i u i iu^ i , |i ^ i °Ji;u ^i J i ^ ,i u: ,, ^^ o8T2@© 



D EFFICIENCY, PER CENT — 7 7 ] / / 5 t ,n 



I I , I ■ L 1 1 1 ( (t ■ < 1- 



•^-^ 5 



PITCH-DIAMETER RATIO, SELECTED " 



NOTE 1- SCALE INDICATES RELATIVE EFFICIENCY RATIO WITH VARIATION IN 1^0 RATIO 

 NOTE Z- IF FIRST DIAMETER IS NOT SATISFACTORY, ROTATE STRAI&HTED&E A60UT P/d AXIS 

 UNDER SCALE F UNTIL A SUITABLE DIAMETER AND PITCH ARE FOUND 



FiQ. 77. U MuLTiPUE Nomogram of W. E. Febmann fob Determining Characteristics of AIotobboat 



Propellers 



