Analysis Used in Submerged Body Research 449 
which can be used from model to model, thereby eliminating the need for special purpose 
equipment for each model. There are other advantages associated with size. DTMB is not 
only in the business of checking specific designs; extensive systematic studies are also 
conducted at DTMB and the Planar-Motion-Mechanism System is very amenable to such 
studies and relatively cheap to operate. For example, it takes approximately one week of 
testing to completely define all the hydrodynamic characteristics for a specific submarine 
design. 
