help and the later PISCES vehicles (IV & V) 

 abandoned the fins (Fig. 8.17) for easier ac- 

 cess to the aft machinei-y sphere, improved 

 handling and because they were of little 

 control value anyway. The fins were taken 

 off PISCES II and /// when purchased by 

 Vickers. Ironically, had the fins been left on 

 the III vehicle, the entanglement and subse- 

 quent flooding of the machinery sphere 

 which led to its sinking could not have oc- 

 curred (see Chap. 15). 



MANEUVERING 



The widest divergence of design philosophy 

 in manned submersibles is found in the ap- 

 proaches taken to maneuvering and, based 

 on current submersibles employment rec- 

 ords, there seems to be no best and no worst 

 approach. About the only way to categorize 



ANGLE OF ATTACK o (OEG) 



Fig. 8 15 Variation of shroud lift coefficient with angle of attack for various aspect 

 ratios 



Fig 8 16 STAR III and BEAVER Showing two different configurations of fixed stem stabilizers {Gen Dyn and North Amencan Rockwell) 



381 



