34,000 pounds of syntactic foam (36-pcf ave. 

 density) neutralizes negative buoyancy of 

 fixed structure and equipment; and 4) mova- 

 ble lead ballast (26-lb bricks), up to 3,000 

 pounds, provides the means of adjusting trim 

 and weight as calculated pror to each dive. 



Trim 



The longitudinal moment (trim) of DEEP 

 QUEST can be changed 30 degrees up or 

 down during the dive by pumping oil from 

 one to another of two, 18-inch-diameter, pres- 

 sure-compensated, spherical tanks located 

 fore and aft; each tank is initially half filled 

 with 720 pounds of mercury which are sepa- 

 rated from the oil by a rubber diaphragm 

 and forced forward or aft by the pumped oil. 

 A further refinement on DEEP QUEST is a 

 port/starboard list tank system which 



changes the roll or transverse moment (±10 

 degrees) of the vehicle in a fashion similar to 

 the trim system. 



Stability 



The surfaced metacentric height (GM) of 

 DEEP QUEST is 12 inches; the submerged 

 metacentric height (BG) is 3 inches. The short 

 BG requires that careful consideration 

 be given to attachment location and weight 

 of additional equipment. 



Power 



Main power is supplied by two, 120-VDC, 

 pressure-compensated, lead-acid batteries 

 supplying a total of 230 kWh which enable 

 the vehicle to cruise at a speed of 2 knots for 

 18 hours. For scientific or other work instru- 

 ments the following is available: 



RUDDER 

 (YAW) HORIZONTAL MOVE 

 ^_^ 'THRUSTERS (1) RIGHT 



I BATTER I E"S~1 ^,.^^VERTICAL 



THRUSTERS (3) 

 "-Al^^^t :f MOVE 



REV-FWD THRUSTERS (2) ^EFT 



DIVE 

 PLANE 

 (PITCH) 



VERTICAL THRUSTER CONTROL 

 (UP/DOWN) 



DYNAMIC CONTROL 



PAYLOAD AREA 

 MAN-IN-SEA MODULE 



VARIABLE BALLAST TANKS (2) 

 PRESSURE SPHERES 



BLOW 

 MAIN i 



BALLAST '- 



TANKS 

 (4) 



BOW VIEW 



STATIC CONTROL 



Fig. 2.5 DEEP QUEST's dynamic and static maneuvering ability. 



23 



