EVALUATION 



Two dockside field tests were conducted with the 

 oceanographic winch and experimental depth regulation 

 equipment shown in figure 2. The depth sensor equipped 

 with bellows and synchro motor was first lowered into 20 

 feet of water alongside a Navy Electronics Laboratory 

 pier. Up-and-down manually controlled movements gave 

 positive and linear signals from 0. 1 to 2 volts per inch of 

 depth change. 



In another dockside demonstration, the experimental 

 depth regulation equipment was attached to the oceanographic 

 winch temporarily installed on USS MARYSVILLE (EPCER 

 857). Voltage signals comparable to those obtained in the 

 sensor test were induced into the phase amplifier circuit to 

 simulate pressure changes that would be encountered by a 

 vessel under the influence of surface wave action. All syn- 

 chro signals responded to the induced pressure changes, with 

 85 per cent or greater efficiency of signal range and re- 

 action. Figure 6 illustrates in a general way how depth 

 regulation reduces unwanted vertical motion. 



Shipboard tests at sea have not been made because 

 the equipment is an experimental one. Such tests await 

 the construction of an equipment engineered for shipboard 

 use. 



NO DEPTH CONTROL 



(REFLECTS WAVE ACTI ONI 



DEPTH REGULATION: < 100 PER CENT 



I DEAL DEPTH CONTROL 100 PER CENT 



2 o 



s 2 



s 



S4 



l 1 *^ -, 



— \7 W 'O- 



Figure 6. General depth control relationships 



12 



