D-2 



JH 160* 



Fianctlon: Under water "bulldozing. 

 Operating Depth : Shallow - 5in (16 ft). 



Deep - 5 to 60in ( I6 ft to 197 ft ) . 

 Dimensions ( LxWxH ) : Shallow - 6.2m x km x 2.8m (20.3 ft x I3.I ft x 9.2 ft) 



Deep - T.2m x 5 - Ijn x U.2m (23-6 ft x 16.T ft x 13.8 ft) 

 Weight : Shallow - l6t ( I8 tons) in air; 13t ( lU tons) in water 



Deep - 32t (35 tons) in air; 2^t (26 tons) in water. 

 Speed : Shallow - 2 knots (3.7 km/hr) 



Deep - 1.6 knots (3 km/hr) 

 Power : Shallow - Hydraulic. Powered by a l60PS/l,600rpm Hitachi B-60 

 diesel engine. 



Deep - Hydraulic. Unit is driven by a 150kw, 3,300 V electric 

 motor which receives it's power from a surface diesel engine. 

 Propulsion : Shallow & Deep - Caterpillar tracks. Both units have buoyancy 

 tanks which are blown free of water and permit the vehicles to surface. 

 On the surface they are towed to the work site. 

 Tools/Instrumentation : Shallow - Bulldozer blade and bottom ripper. 



Deep - Bulldozer blade and bottom ripper. 

 Gyrocompass, vertical gyro, transducer, depth meter, forward scanning 

 sonar, hydrophone. 



Navigation : Shallow - A sign pole attached to the vehicle protrudes 

 above the water surface. The operator on the surface barge views the 

 motion of the sign pole which indicates the inclination, direction and 

 depth of the bulldozer and the blade position. 



Deep - The acoustic positioner (transponder, interrogater 

 and indicator) monitors the position and the crawling direction of the 

 bulldozer. Position and direction are displayed on a CRT by a bright 

 spot and an arrow. The forward-looking sonar monitors the bottom profile 

 in front of the bulldozer, it is displayed on the CRT. A vertical gyro 

 and gyrocompass indicate direction and pitch and roll angles. Steering 

 is the same as a conventional bulldozer: two levers. 



Shipboard Components : Shallow - Diesel engine, hydraulic power unit, 

 air compressor, operating controls. 



Deep - Diesel engine, electric generator, auxiliary 

 generator, cable winch, air compressor, bulldozer hoisting winch, 

 operating controls. 



Support Ship Requirements : Shallow - The surface support ship is_ a self- 

 powered catamaran capable of 2 knots (3.7 km/hr). It displaces lUt 

 (15.^ tons), is powered by a 90 PS, 2,000 rpm diesel engine and has 

 dimensions (LxWxH) of 10.5m x 6.2m x 1.3m (3^.H ft x 20.3 ft x U.2 ft). 



Deep - A non-self propelled barge of 

 approximately lOOt ( 110 tons) displacement with dimensions (LxWxH) of 

 16.5m X 10.2m X 1.8m (5^.1 ft x 33-5 ft x 5.9 ft). 



Status : Unknown 

 Builder/Operator : Hitachi Ltd. 



Tokyo , Japan 



*Two vehicles have been constructed, a shallow version and a deep version, 

 in 1969 and 1971, respectively. 



