Propeller Excitation and Response of 230000 TDW Tankers 



V2 2 2 



(cjt+V ) + V . + V 

 U v t' a r 



2. Ang le of incidence 



Au (x, z) 1 , n S^. . 



-4-^ ■ ! Tfr ■ tr > • " +^^> <*> 



zO S v; , . x cosI-mJA 



(x) v M T ; 



U . = LT . sine*, cos 7 



zO 



1 

 S ( 3 ) ( x ) = J_ r dz ( x ') _ 2z(x') dx' 



* ^ dX ' l-(l-2x') 2 x-x 1 



7 = rake angle 



ftM T 



a n . cosfl/i T ^ V 4 

 2 | 1 +(- ") f 



7rA 



3. Mean Line Camber 



Au c (x, z) 7 b (x) /z .tanfi dz (x) 



+ 



U« 2U 2 2 * dx 2 2 



NO 1 +m t -tan ft 1 + u .tan ft 



( 1 -* } e - (3) 



x 



« dx' 1 - x 1 x-x 1 



2 2 



„ . 1 u m . tan ft - 1 



0=1- -^— . arccos ^ T 



2 7T 



2 2 



M m . tan ft + 1 

 T 



4. Thickness of the Other Blades 



The cascade effects are obtained as shown by 0. Ho'iby [l4_[ , Scholz 

 [2l], Schlichting [22^] and Pollard and Wordsworth [23] . 



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