D-15 



UNDERWATER BULLDOZER (D155W) 



Function: Bulldozing, dredging 



Operating Depth : Tm (23 ft) 



Dimensions (LxWxH) : 19.3m x l^m x 9.8m (30-5 ft x 13 ft x 32.2 ft) 



Weight (Dry) : 1)3. 5t (^7-9 tons), in water - 2T.9t (30.8 tons) 



Speed : Forward 1st 3.6km/hr (I.9 knots) 



2nd 6,5km/hr (3-5 knots) 

 Reverse 1st ^4 . 3km/hr (2.3 knots) 



2nd T.Tkm/hr (I4.2 knots) 

 Power : Vehicle power is supplied from a s^ibmersible diesel engine 

 (KOMATSU S6D155-i4) providing 2T0hp at 2,000 rpm. A mast which protrudes 

 through the water surface incorporates the intake and exhaust ducts. 

 Propulsion : Caterpillar tracks. Maneuvering controls can he by a remote 

 radio control system or a wire control system. The. radio control system 

 has an effective control range of 50m (16I+ ft), it is a dual combination 

 low- frequency unit transmitting from l!+1.68 to lUl.96mHz. 

 Tools /Instrument at ion : Bulldozing blade - 3.8 cu m (5 cu yd) capacity, 

 parallelogram-type hydraulic ripper. Atop the mast is blue lamp which 

 flashes when the vehicle inclines greater than 21 degrees. A yellow 

 lamp flashes to warn that engine oil pressure, engine water temperature 

 or torque converter oil temperature exceeds a safe level. A red lamp 

 lights when incoming water in the engine housing rises to a point at 

 which the train pump begins to operate and then flashes on/off when pump 

 capacity is exceeded. A horn audibly warns the operator in all instances. 

 Navigation : By observing mast orientation. 

 Shipboard Components : Control system 

 Support Ship Requirements : None, operates from land-based control station. 



Status : Constructed, but not available commercially as of 12 September 1978. 

 Operator /Builder : Komatsu, Ltd. 



Tokyo , Japan 



