(left) Barnett: length overall 52ft; beam 14ft; draught 4ft 6in; displacement 29 tons; maximum speed, 9 knots; range a! full speed, 350 nautical miles. The Barnett, introduced in 1950, has a crew of seven; she launches down a slipway or lies afloat. Her hull is built of wood. photograph by courtesy of EH Pictures.