Johnsson and Stfntvedt 



dC dC 



a = (f-& + a) — — / — -a - (a - a ) 



o da da o i3 i2 



a = effective angle of incidence, corrected for lifting surface 

 effects 



t 

 <*. „ = <* . k + k — — 



i3 i2 oc t D 



where k and k are found from lifting surface theory [_24j 



From [l4jwe quote : 



" For a swept wing Weber [_30_] has shown that a flow parallel to the 

 span must be added, so that the total pressure distribution is given 

 as : 



C (x) = 1 - (—=* j - cos a sin ft 



P u o 



V T (x) = U n + Au (x) + Au (x) + Au (x) + u (x) + u (x) 

 i-i t a c c p 



APPENDIX B 



CAVITY FORMATION, METHOD OF CALCULATION 



1 . Extent of Cavitation 



When the detailed blade pressure distribution is known, the 

 amount of cavitation may be determined, see [26, 27 J 



X 2 X 3 



*■ - k 



X l X 2 



/ * 2 V? w 



where 



x = the point at which the local pressure falls below the cavi- 



tation pressure p ~ p 



c vapor 



X, = the point at which the local pressure has increased and 



reached the cavitation pressure 



612 



2 



