Expert W173(A172) 1945, Capable W171(A508) 1946, Careful W172(A293) 1946, Nimble W123(A223) 1942.
Length 175' Beam 35' 8" Draught 17' GRT831.89 Speed 15 knots
Engines Steam triple expansion, 2 boilers Fuel FFO 296 tons IHP3000 Propulsion Twin screws, single rudder Bollard Pull 30 tons. Range 7000 miles Complement 30.