Ham-class minesweeper
 | This article includes a list of general references, but it lacks sufficient corresponding inline citations. (February 2013) |
.jpg) HMS Portisham
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| Class overview | |
|---|---|
| Operators | |
| Built | 1954–1959 |
| Completed | 93 |
| General characteristics | |
| Type | Minesweeper |
| Displacement |
|
| Length | |
| Beam |
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| Draught |
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| Propulsion |
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| Speed | 14 knots (26 km/h; 16 mph) |
| Range | 15 tons diesel fuel, ? |
| Complement | 2 officers, 13 ratings |
| Armament | 1 × Bofors 40 mm 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.
Unlike traditional minesweepers, they were not equipped for sweeping moored or magnetic mines. Their work was to locate individual mines and neutralise them. This was a then-new role, and the class was configured for working in the shallow water of rivers, estuaries and shipping channels.
The class consisted of 93 ships, launched between 1954 and 1959. HMS Inglesham was the first. They were built in three slightly different sub-groups, the first sub-group, the 26-group, is distinguished by pennant numbers 26xx, and the second and third sub-groups, the 27-group, are distinguished by pennant numbers 27xx. The 26-group was of wood and non-ferrous metal composite construction and the 27-group was of all-wood construction. The third sub-group is distinguished by a prominent rubbing strake around the hull and slightly larger dimensions.
The vessels displaced 164 long tons (167 t) fully laden and were armed with one 40 mm Bofors or 20 mm Oerlikon gun. They were 32.5 metres (107 ft) long overall with a 6.4-metre (21 ft) beam. The construction was of wood to minimise the magnetic signature. The crew complement was 15, rising to 22 in wartime.
The engines of this class were Paxman diesels, some of which were built under licence by Ruston and Hornsby of Lincoln. Each vessel had: two 12YHAXM (intercooled) for main propulsion, rated at 550 bhp (410 kW) at 1,000 rpm, plus one 12YHAZ for pulse generation. Maximum speed was 14 knots (26 km/h; 16 mph) dropping to 9 knots (17 km/h; 10 mph) when mine sweeping.
The class shared the same basic hull as the Template:Sclass2- and the Template:Sclass- inshore survey craft.
Ships
In 1964 Ten of the vessels were allocated to the Royal Naval Auxiliary Service
| Name | Call sign | Pennant No | Completed | Builders | Joined RNXS | Disposal |
| Birdham | M.2785 | 5-Mar-57 | J.Taylor | 1964 | May 1980 - Arrived Great Wakering, Essex for Breaking | |
| Odiham | M.2783 | 27-Jul-56 | Vospers | 1964 | 1978 - on disposal list., May 1980 sold to Sutton & Smith, Great Wakering, Essex | |
| Pagham | M.2716 | 22-Mar-56 | Jones, Buckie | 1964 | to 1974.1982, RNR Tender | |
| Portisham | GTDG | M.2781 | 26-Mar-56 | Dorset Yacht | 1964 | to 1983 at HMS Vernon, Portsmouth |
| Puttenham | M.2784 | 9-May-58 | Thorneycroft | 1964 | to 1978 at Plymouth | |
| Saxlingham | M.2727 | 29-Jan-57 | Berthon Boat | 1964 | to 1965. Approved to scrap 1966. 2 May 1968 sold to Ross & Cromarty CC for Lewis Sea School | |
| Shipham | MTMW | M.2726 | 3-Feb-56 | Brooke Marine | 1964 | to 1983 at Gillingham |
| Shrivenham | M.2728 | 11-Aug-56 | Bolson | 1964 | to 1965. For disposal in 1966. Sold to PLA, 21 Feb 1969. Approved to scrap 1966. 2 May 1968 sold to Ross & Cromarty CC for Lewis Sea School | |
| Thakeham | GTJC | M.2733 | 15-Nov-57 | Fairlee Yacht | 1964 | to 1978. 1979 for disposal |
| Tongham | M.2735 | 18-Jun-57 | J.Miller | 1964 | to 1978, also PAS. 1979 for disposal |
References
- Warships of the Royal Navy, Captain John. E. Moore RN, Jane's Publishing, 1979
