294 



Good Data Run 



FIGURE 12. Examples of force measurement 

 flexure signal output - data averaged over 

 several hundred propeller revolutions. 



(0 

 4J 



H 

 O 



> 



10 



c 



-H 



en 



0) 



o 



u 

 O 



r; 30 60 90 , 120 150 180 210 24P 270 306 330 ' 360 



50 60 ?n 120 1=0 180 210 Z-ie 2ro 300 330 360 



High Frequency Contamination 



l=^f> !90 



340 2-/P 30Q 3^6 36a 



Shaft Angle, Degrees 



^in*^'^'"''' ^ -inNuciC2C >Jl - y^ ( j Jin — - - jjj cos f and (x,r,f) is a cylindrical coordinate system with 



the origin at the center of the spheroid and the 

 (66) major axis extending from x = L/2 to + L/2 . The 

 I ~ constants, ci and c2 in (66) are readily determined 



Here Y = Jl + C and (t^,]J,f) are the spheroidal in terms of the spheroid's maximtm diameter/length 

 coordinates defined by ratio, 6, as 



-1 V \jt;^ + 1, 



r = ci 5 ,1 - y^, f = f 



with 



0:S5^'», -l<y<l,fO<y<2Ti 



1-6' 



C]^ = focal length 



(67) 



PROPELLER PLANE 



TRUNCATION LINE FOR 

 DETERMINATION OF FORCE 



PANELS USED FOR CLOSURE OF BODY 



FIGURE 13. Schematic of expanded surface of 

 DTNSRDC ellipsoidal test body divided into 154 

 source panels (dimensions in multiples of pro- 

 peller radius) - 



