Ham-class minesweeper: Difference between revisions

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{{short description|1954 class of minesweeper of the Royal Navy}}

{{more footnotes|date=February 2013}}

{{Use dmy dates|date=April 2022}}

{{more footnotes needed|date=February 2013}}

{|{{Infobox ship begin|sclass=2}}

{{Infobox ship image

|Ship image=HMS ArmoisePortisham M772(26782178757).jpg

|Ship caption=HMS ''Portisham''

}}

{{Infobox ship class overview

|Name=

|Builders=

|Operators=*{{navy|UKUnited Kingdom}}

*{{navy|Australia}}

*{{navy|France}}

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|Ship sensors=

|Ship EW=

|Ship armament= 1 × [[Bofors 40 mm L/60 gun]] ''or'' [[Oerlikon 20 mm cannon]]

|Ship armour=

|Ship notes=

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The '''Ham class''' was a [[ship class|class]] of inshore [[minesweeper]]s (IMS), known as the Type 1, of the British [[Royal Navy]]. The class was designed to operate in the shallow water of [[river]]s and [[Estuary|estuaries]]. All of the ships in the class are named for British place names that end with [[List of generic forms in British place names|-"ham"]]. The parent firm that was responsible for supervising construction was [[J. Samuel White|Samuel White]] of [[Cowes]], Isle of Wight.

==Description==

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 [[river]]s, [[Estuary|estuaries]] and [[shipping channel]]s.

The class consisted of 93 ships, launched between 1954 and 1959. {{HMS|Inglesham|M2601|6}} was the first. They were built in three slightly different sub-groups, the first sub-group, the 26-group, is distinguished by [[pennant number]]s 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.

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 [[river]]s, [[Estuary|estuaries]] and [[shipping channel]]s.

The vessels displaced {{convert|164|LT}} fully laden and were armed with one [[Bofors 40 mm gun|40 mm Bofors]] or [[Oerlikon 20 mm cannon|20 mm Oerlikon]] gun. They were {{convert|32.5|m}} long overall with a {{convert|6.4|m|adj=on}} beam. The construction was of wood to minimise the magnetic signature. The crew complement was 15, rising to 22 in wartime.

The vessels displaced {{convert|164|LT}} fully laden and were armed with one [[Bofors 40 mm gunAutomatic Gun L/60|40 mm Bofors]] or [[Oerlikon 20 mm cannon|20 mm Oerlikon]] gun. They were {{convert|32.5|m}} long overall with a {{convert|6.4|m|adj=on}} 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 (engines)|Paxman]] [[diesel engine|diesels]], some of which were built under licence by [[Ruston (engine builder)|Ruston and Hornsby]] of [[Lincoln, Lincolnshire|Lincoln]]. Each vessel had: two 12YHAXM (intercooled) for main propulsion, rated at {{convert|550|bhp|abbr=on|lk=in}} at 1,000 rpm, plus one 12YHAZ for pulse generation. Maximum speed was {{convert|14|kn}} dropping to {{convert|9|kn}} when mine sweepinghunting.

The class shared the same basic hull as the {{sclass2-|Ley|minehunter}} and the {{sclass-|Echo|survey ship (1957)|0}} inshore survey craft.

{{Clear}}

==Ships==

{{div col|colwidth=30em}}

{{Col-begin}}

{{Col-1-of-3}}

* {{HMS|Abbotsham}} (IMS87)

* {{HMS|Altham}} (IMS02)

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* {{HMS|Boreham}} (IMS10)

* {{HMS|Bottisham}} (IMS11)

* {{HMS|Brantingham}} (IMS12) (later HMMS ''Temasek'')<ref>{{cite book|title=Malaysia|author1=British Association of Malaysia|author2=British Association of Malaysia and Singapore|year=1958|page=51|url=https://books.google.co.ukcom/books?id=WHkZAAAAMAAJ&q=%22hms+brantingham%22&dq=%22hms+brantingham%22&hl=en&sa=X&ved=0ahUKEwi_8rvfwcvYAhVIYlAKHSdqBu0Q6AEIMzAD|accessdateaccess-date=9 January 2018}}</ref>

* {{HMS|Brigham}} (IMS13)

* {{HMS|Bucklesham}} (IMS14)

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* {{HMS|Felmersham}} (IMS29)

* {{HMS|Flintham}} (IMS30)

{{col-2-of-3}}

* {{HMS|Fordham}} (IMS54)

* {{HMS|Frettenham}} (IMS20)

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* {{HMS|Pineham}} (IMS56)

* {{HMS|Polsham}} (IMS92)

{{col-3-of-3}}

* {{HMS|Popham}} (IMS82)

* {{HMS|Portisham}} (IMS81)

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* {{HMS|Wrentham}} (IMS79)

* {{HMS|Yaxham}} (IMS80) (later HMS ''Woodlark'')

{{Col-div col end}}

In 1964 Ten of the vessels were allocated to the [[Royal Naval Auxiliary Service]]

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|'''Dorset Yacht'''

|'''1964'''

|'''to 1983 at HMS ''Vernon'', Portsmouth'''

|-

|Puttenham

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|Bolson

|1964

|to 1965. For disposal in 1966. Sold to PLA, 21 Feb 1969Approved1969. Approved to scrap 1966. 2 May 1968 sold to Ross & Cromarty CC for Lewis Sea School

|-.

|'''Thakeham'''

|'''GTJC'''

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{{reflist}}

* ''Warships of the Royal Navy'', Captain John. E. Moore RN, Jane's Publishing, 1979

<br>

{{Ham class minesweeper|others}}

{{Yugoslav Ships |state=collapsed}}

{{Ship classes of the Indian Navy}}

[[Category:Mine warfare vessel classes]]

[[Category:Ham-class minesweepers| ]]

[[Category:Mine warfare vessel classes]]

[[Category:Ship classes of the Royal Navy]]

[[Category:Mine warfare vessels of the Yugoslav Navy]]