78 



ll\l)RenJ\.\A.\lR„s l.\ Mill' 1)1 SU,.\ 



Sec. 11.6 



TABLE \\.\i — List ok IIcfcrences Containing FijOw Diauiuus About AiBtx>iLs and IIyuuofoils 

 AU diagruna roproecnt flow with circulation unless othcrwiao indirntcd. 



These Dutch authors also summarize the 

 results of model experiments by G. Fliigel ["Ver- 

 glcichsversuchc an Rudermodeilcn (Comparative 

 Tests of Model Rudders)," Schiffhau, SchifTahrt 

 und Hafenhau, 15 Jun 1940, pp. 1G7-1G9; 8 Jul 

 1940, pp. 189-194]. Among nine rudder sections 

 tested, Rudder VIII and Rudder IX were of the 

 compound type. Curves of lift coefficient, drag 

 coefficient, moment ctx-fficient on the stock, and 

 ratio of (1) distance of center of pressure CP from 

 the leading edge to (2) ch<jrd length of the com- 

 plete a.s8cnil)ly arc to be found in I''ig. 2 Hi on 

 page 320 of RPSS, 1918. 



Data relative to the action of both the ((jntrui 

 Hurface and the .ship hull in its entirety, in pr(Mlu(- 

 ing a Hwiriging or other moment f)n the hull, arc 

 diMcu.s.s<-d iiiidiT ((inlriil-.surfari' design in Chap. 7 I. 



44.6 Flow Patterns Around Typical Hydro- 



foils. The publi,shed literature on aerodynamics 

 and hydrodj'namics contains a considerable 

 number of diagrams depicting the flow about 

 airfoils and hj'drofoils of various shapes. There 

 are also a number of published photographs, 

 taken with the aluminum-powder or an ofiuivalcnt 

 niethoil, which illustrate the nature of the flow 

 around hydrofoils and airfoils throughout rather 

 large ranges of the angle of attack. 



Table 44. b lists a muuber of references where 

 flow diagrams may be found. Table 44. c lists 

 references (;ontaining good reproductions of flow 

 Iihotographs. 



Fig. 44.10 illustrates the typical flow pattern 

 about a .symmetrical hydrofoil at a mo<lerate 

 angle of attack, as cah-ulated for an ideal lluid 

 and a.s determined for a real lluiil during a test 

 ill a wind tunnel. 



