Ham-class minesweeper

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HMS Portisham
Class overview
Operators	Royal Navy  Royal Australian Navy  French Navy  Ghana Navy  Libyan Navy  Indian Navy  Royal Malaysian Navy  Royal Saudi Navy  Yugoslav Navy
Built	1954–1959
Completed	93
General characteristics
Type	Minesweeper
Displacement	120 long tons (122 t) standard 164 long tons (167 t) full load
Length	100 ft (30 m) p/p 106 ft 6 in (32.46 m) o/a, except third sub-group 107 ft 6 in (32.77 m)
Beam	26-group: 21 ft 4 in (6.50 m) 27-group: 22 ft (6.7 m)
Draught	26-group: 5 ft 6 in (1.68 m) 27-group: 5 ft 9 in (1.75 m)
Propulsion	2 shaft Paxman 12YHAXM diesels 1,100 bhp (820 kW)
Speed	14 knots (26 km/h; 16 mph)
Range	15 tons diesel fuel, ?
Complement	2 officers, 13 ratings
Armament	1 × Bofors 40 mm L/60 gun or Oerlikon 20 mm cannon

The Ham class was a class of inshore minesweepers (IMS), known as the Type 1, of the British Royal Navy. The class was designed to operate in the shallow water of rivers and estuaries. All of the ships in the class are named for British place names that end with -"ham". The parent firm that was responsible for supervising construction was Samuel White of Cowes, Isle of Wight.