Fig 8,10 Plexiglass bow planes on DEEP RIVER provide pitch motion Ttie central 



duct encloses a reversible screv^ propeller v^hicti can be rotated 360 degrees to 



obtain propulsion in any vertical plane (NAVOCEANO) 



can make piloting difficult, it can be used to 

 advantage in surmounting sudden, vertical 

 obstacles in the vehicle's path. A number of 

 vehicles have fixed (non-moving) fins or sails 

 for stabilization at higher speeds. At the 

 very low speeds at which submersibles work 

 and transit, the need for such stabilizing 

 surfaces is sometimes debatable. Indeed, as 

 related in Chapter 5, Mr. Edwin Link and 

 others go to the other extreme — decrying 

 even the need for fairings to streamline the 

 vehicle. Whether they are necessary or not, 

 they are still on the vehicle where they as- 

 sume a variety of shapes and sizes. Two 

 arrangements of stern-mounted stabilizers 

 are shown in Figures 8.16 a & b on STAR III 

 and BEAVER, respectively. Supporting the 

 non-stabilizer faction, PISCES II and /// 

 originally had tail fins; experience showed 

 that these were more a hindrance than a 



Rg 8-11 Marline's SU8M4W>iL/r obtains yaw and pitcti motion from stern-mounted 

 rudder and planes 



Fig- 8,12 Both propeller and njdder are ducted m SEA OTTER (or protection and 

 greater effiaency 



379 



