Length overall 11.582 metres (12)
Beam 3.810 metres
Depth moulded 1.820 metres
Draught
(fully loaded, less crew members) Aft 0.910 metres
Fwd 0.990 metres
Displacement 14.25 Tonnes
Engines:
2x Caterpillar 3208 marine turbo Diesels
Type: Four Stroke,
No. of Cylinders: 8
Bore: 114mm
Stroke: 127mm
Displacement: 10.4 Litres
Shaft horse power 210kW each
speed (Maximum) 16.5 knots
speed (Cruising)  16 knots
Range at cruising speed 162.5 nautical miles
Duration at cruising speed 10.26 hours approx.
Fuel capacity 1088 litres
Number of crew 6

The D Class was the RNLI's first inflatable, introduced in 1963. It has a single outboard engine and is ideal for rescues close to the shore in fair to moderate conditions and can be self righted manually by the crew after capsize. The crew all wear dry suits.
Specification
Length 4.9 m (16')
Crew 2/3
Speed 25 knots
Displacement 338kg (745lb)
Endurance 2.5hrs at max speed
Launched Trolley & tractor
Construction Nylon coated with hypalon

Weight: 19 tonnes (with track pads)
Engine: Caterpillar 3208 diesel engine [More details]
Length: 5.5m
Width: 2.4m
Height: 2.9m
Max Speed: 7mph
Drawbar Pull: 15 tonnes
Winch wire Pull: 15 tonnes
Track Plates: 50.8cm

Technical Details The tractor has a totally enclosed cab for the driver and is fully waterproof and capable of operating at greater depths than existing tractors. Two quartz iodine headlights are fitted at each end in glazed water-proof boxes, which also contain side and tail lights, turn indicators and blue flashing lights. In addition two quartz iodine floodlights are mounted at each end of the cab roof. Because the tractor has been specifically designed, it has been possible to build in a very efficient air cooling system for use on the beach. When the tractor enters the water, a pair of protected keel coolers take over automatically. The driving seat can face either way and control is by a simple joystick which is pushed in the direction of travel required. The power to the joystick is controlled by a 'deadman's pedal' which is the only control necessary for travel other than engine speed. The winch is operated by a simple haul/stop/payout lever, again protected by a deadman's pedal.