(left) D class inflatable: length overall 15ft 6in; beam 6ft 4in; draught 17in; displacement 0.25 tons; maximum speed, 20 knots; range at full speed, 60 nautical miles. The D class inflatable, introduced in 1963, has a crew of two; she launches from a carriage or over the beach. Her hull is neoprene coated nylon.

photograph by courtesy of S. Bennetts.