Open main menu
Home
Random
Recent changes
Special pages
Community portal
Preferences
About Wikipedia
Disclaimers
Incubator escapee wiki
Search
User menu
Talk
Dark mode
Contributions
Create account
Log in
Editing
HMS J7
Warning:
You are not logged in. Your IP address will be publicly visible if you make any edits. If you
log in
or
create an account
, your edits will be attributed to your username, along with other benefits.
Anti-spam check. Do
not
fill this in!
{{short description|Submarine of the Royal Navy}} {{EngvarB|date=December 2016}} {{Use dmy dates|date=December 2016}} {|{{Infobox ship begin}} {{Infobox ship image |Ship image = HMAS J7 (AWM H12461).jpg |Ship caption = HMAS ''J7'' }} {{Infobox ship career |Ship country = United Kingdom |Ship flag = {{shipboxflag|United Kingdom|naval}} |Ship name = HMS ''J7'' |Ship ordered = |Ship builder = HM Dockyard, Devonport |Ship yard number = |Ship laid down = |Ship launched = 12 February 1917 |Ship acquired = |Ship commissioned = |Ship decommissioned = |Ship fate = Transferred to Australia, 25 March 1919 }} {{Infobox ship career |Hide header=title |Ship country = Australia |Ship flag = {{shipboxflag|Australia|naval-1913}} |Ship name = HMAS ''J7'' |Ship acquired = 25 March 1919 |Ship commissioned = |Ship decommissioned = 12 July 1922 |Ship fate = Sunk 4 June 1926 |Ship notes=Still extant as breakwater as of 2021 }} {{Infobox ship characteristics |Ship class = [[British J class submarine]] |Ship displacement = *{{convert|1210|LT|t}} (surfaced) *{{convert|1760|LT|t}} (submerged) |Ship length = {{convert|275|ft|abbr=on}} |Ship beam = {{convert|22|ft|abbr=on}} |Ship draught = {{convert|14|ft|abbr=on}} |Ship propulsion = *Three shafts *Surfaced: three 12-cylinder diesel engines *Submerged: battery-driven electric motors |Ship speed = *{{convert|19|kn|abbr=on|lk=in}} (surfaced) *{{convert|9.5|kn|abbr=on}} (submerged) |Ship range = {{convert|4000|nmi|abbr=on}} at {{convert|12|kn|abbr=on}} |Ship endurance = |Ship test depth = {{convert|300|ft|m|abbr=on}} max{{citation needed|date=January 2014}} |Ship complement = 44 personnel |Ship sensors = |Ship EW = |Ship armament = *six [[British 18 inch torpedo|18 inch (450 mm)]] torpedo tubes *(four bow, two beam) *one {{convert|4|in|mm|0|abbr=on}} gun |Ship notes = }} |} '''HMS J7''' (later '''HMAS J7''') was a [[J class submarine|J-class]] [[submarine]] operated by the [[Royal Navy]] and the [[Royal Australian Navy]]. ==Design and construction== {{Main|J-class submarine}} The J class was designed by the Royal Navy in response to reported German submarines with surface speeds over {{convert|18|kn}}.<ref name=Bastock86>Bastock, ''Australia's Ships of War'', p. 86</ref> The submarines had a displacement of 1,210 tons surfaced, but ''J7'' had a lighter submerged displacement than her sister boats, at 1,760 tons.<ref name=Bastock86/> Each submarine was {{convert|275|ft}} in length overall, with a beam of {{convert|22|ft}}, and a draught of {{convert|14|ft}}.<ref name=Bastock86/> The propulsion system was built around three propeller shafts; the J-class were the only triple-screwed submarines ever built by the British.<ref name=Bastock86/> Propulsion came from three 12-cylinder diesel motors when on the surface, and electric motors when submerged.<ref name=Bastock86/> Top speed was {{convert|19|kn}} on the surface (the fastest submarines in the world at the time of construction), and {{convert|9.5|kn}} underwater.<ref name=Bastock86/> Range was {{convert|4,000|nmi}} at {{convert|12|kn}}.<ref name=Bastock86/> Armament consisted of six [[British 18 inch torpedo|18 inch (450 mm)]] torpedo tubes (four forward, one on each beam), plus a 4-inch deck gun.<ref name=Bastock86/> Originally, the gun was mounted on a [[Breastwork (fortification)|breastwork]] fitted forward of the conning tower, but the breastwork was later extended to the bow and merged into the hull for streamlining, and the gun was relocated to a platform fitted to the front of the [[conning tower]].<ref name=Bastock86/> The conning tower on ''J7'' was sited {{convert|60|ft|m}} further back than her sister boats, as the control room was located behind the machinery spaces.<ref name=Bastock86/><ref name=tall>{{cite book |title=HM Submarines in Camera An Illustrated History of British Submarines |last=Tall |first=J.J |author2=Paul Kemp |year=1996 |publisher=Sutton Publishing |isbn=0-7509-0875-0 |page=54}}</ref> 44 personnel were aboard.<ref name=Bastock86/> ''J7'' was built by [[HMNB Devonport|HM Dockyard Devonport]] in [[Plymouth]] and launched on 12 February 1917.<ref>{{Cite web |title=HMAS J7 |publisher=Royal Australian Navy |url=http://www.navy.gov.au/hmas-j7 |accessdate=2011-03-13 }}</ref> ==Operational history== After the war, the [[British Admiralty]] decided that the best way to protect the Pacific region was with a force of submarines and cruisers.<ref name=Bastock86/> To this end, they offered the six surviving submarines of the J-class to the [[Royal Australian Navy]] as gifts.<ref name=Bastock86/> ''J1'' and her sisters were commissioned into the RAN in April 1919, and sailed for Australia on 9 April, in the company of the cruisers {{HMAS|Sydney|1912|2}} and {{HMAS|Brisbane|1915|2}}, and the tender {{HMAS|Platypus|1917|2}}.<ref name=Bastock86/> The flotilla reached Thursday Island on 29 June, and Sydney on 10 July.<ref name=Bastock86/> Because of the submarines' condition after the long voyage, they were immediately taken out of service for refits.<ref name=Bastock86/> {{stack|[[File:HMAS J7 Submarine Sandringham Yacht Club 600 1662.JPG|thumb|Wreck of HMAS ''J7'' at the Sandringham Yacht Club marina]]}} By the time ''J7'' was returned to service in June 1922, the cost of maintaining the boats and deteriorating economic conditions saw the six submarines decommissioned and marked for disposal.<ref name=Bastock86/> ==Fate== ''J7'' was paid off on 12 July 1922,{{citation needed|date=September 2021}} and was sold on 26 February 1924{{citation needed|date=September 2021}}. The hulk was scuttled in 1930, for use as a [[breakwater (structure)|breakwater]] at the [[Sandringham Yacht Club]] in [[Port Phillip]].<ref name="Callanan">{{cite news |last1=Callanan |first1=Tim |title=As the spotlight falls on Australia's new submarines, this one is ageing quietly at a Melbourne marina |url=https://www.abc.net.au/news/2021-09-26/this-marina-is-home-to-a-100-year-old-submarine/100442728 |access-date=26 September 2021 |work=[[ABC News (Australia)|ABC News]] |date=25 September 2021 |language=en-AU}}</ref> Some years later a stone marina was constructed around the wreck, which was left in situ and visible, being too expensive to remove, where it continues to deteriorate.<ref name="Callanan" /> ==Citations== {{Reflist}} ==References== *{{cite book |last=Bastock |first=John |title=Australia's Ships of War |year=1975 |publisher=Angus and Robertson |location=Cremorne, NSW |isbn=0207129274 |oclc=2525523}} ==External links== * [http://www.syc.com.au/images/marinadir.jpg Map of Sandringham yacht club marina] {{Webarchive|url=https://web.archive.org/web/20080720134524/http://www.syc.com.au/images/marinadir.jpg |date=20 July 2008 }} {{coord|display=title|-37.943381|144.99471|type:landmark_region:AU}} {{J-class submarine}} {{Australian submarines}} {{DEFAULTSORT:J7}} [[Category:British J-class submarines]] [[Category:Ships built in Plymouth, Devon]] [[Category:1917 ships]] [[Category:World War I submarines of the United Kingdom]] [[Category:Scuttled vessels of Australia]] [[Category:Royal Navy ship names]] [[Category:Shipwrecks of Victoria (state)]]
Edit summary
(Briefly describe your changes)
By publishing changes, you agree to the
Terms of Use
, and you irrevocably agree to release your contribution under the
CC BY-SA 4.0 License
and the
GFDL
. You agree that a hyperlink or URL is sufficient attribution under the Creative Commons license.
Cancel
Editing help
(opens in new window)
Pages transcluded onto the current version of this page
(
help
)
:
Template:Australian submarines
(
edit
)
Template:Citation needed
(
edit
)
Template:Cite book
(
edit
)
Template:Cite news
(
edit
)
Template:Cite web
(
edit
)
Template:Convert
(
edit
)
Template:Coord
(
edit
)
Template:EngvarB
(
edit
)
Template:HMAS
(
edit
)
Template:Infobox ship begin
(
edit
)
Template:Infobox ship career
(
edit
)
Template:Infobox ship characteristics
(
edit
)
Template:Infobox ship image
(
edit
)
Template:J-class submarine
(
edit
)
Template:Main
(
edit
)
Template:Reflist
(
edit
)
Template:Short description
(
edit
)
Template:Stack
(
edit
)
Template:Use dmy dates
(
edit
)
Template:Webarchive
(
edit
)