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edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia united states flagged merchant vessel for other ships with the same name see ss portmar history name centaurus 1919 1930 portmar 1930 1943 owner green star line 1919 20 nafra 1920 23 planet steamship co 1923 29 calmar steamship co 1929 42 united states department of war 1942 43 operator green star line 1919 20 nafra 1920 23 planet steamship co 1923 29 calmar steamship co 1929 41 calmar steamship co wsa agent 1941 42 united states department of war 1942 43 port of registry united states 1919 29 new york 1929 43 builder northwest steel yard number 38 launched 17 november 1919 completed december 1919 out of service 16 june 1943 identification united states official number 219283 code letters ltvh 1919 34 call sign kopz 1934 43 fate sunk 16 june 1943 general characteristics class type design 1013 ship type cargo ship tonnage 5 551 grt 3 418 nrt 8 800 dwt length 409 8 feet 124 91 m beam 56 2 feet 17 13 m draft 30 2 feet 9 20 m depth 27 7 feet 8 44 m installed power triple expansion steam engine 582 nhp propulsion screw propeller notes laid down as west minsi portmar was a united states flagged merchant vessel that was constructed in response to world war i operated by a succession of companies in the interwar period then taken up for wartime shipping in world war ii the ship was built to design 1013 as part of wartime orders by the united states shipping board ussb she was laid down by northwest steel of portland oregon with the name west minsi the ussb order was cancelled during construction but northwest steel completed the ship for private sale she was sold to the green star line before launching in november 1919 and was assigned the name centaurus the freighter was sold to nafra in 1920 then on to the planet steamship company in 1923 in 1929 the ship was sold to the calmar steamship company who renamed the ship portmar in late 1941 portmar was chartered by the united states department of war to carry supplies to the philippines but due to the japanese invasion of the philippines was retained in australia she was used in february 1942 to carry reinforcements from darwin for the defenders of timor prior to the japanese invasion the reinforcement convoy was shadowed by japanese planes and attacked forcing its cancellation portmar returned to darwin on 18 february and was still in harbour the next day when japanese carrier based aircraft attacked the city in the first ever attack on australia the ship was heavily damaged and run aground to prevent sinking portmar was later refloated towed to sydney repaired purchased by the united states army and put back into service as an army transport in june 1943 she sailed as part of convoy gp55 on 15 june off smoky cape portmar and the landing ship uss lst 469 were torpedoed by the japanese submarine i 174 due to a highly volatile cargo portmar was abandoned and sank in less than ten minutes she was the last ship lost to the japanese submarine campaign in australian waters design and construction edit main article design 1013 ship the ship was built to design 1013 or the robert dollar type a standardised freighter design ordered by the united states shipping board ussb from multiple west coast shipyards during world war i 1 standard dimensions were 410 5 feet 125 1 m in length with a beam of 54 feet 16 m and a standard draft of 30 feet 9 1 m 1 this vessel varied a little from the standard being 409 8 feet 124 91 m long and 54 2 feet 16 52 m beam depth was 27 7 feet 8 44 m with a draft of 30 2 feet 9 20 m 2 they had a deadweight tonnage value of 8 800 and a gross register tonnage of 5 551 1 3 her net register tonnage was 3 418 2 propulsion machinery varied across the type this ship used oil fuelled boilers connected to triple expansion steam engines 1 4 the engine was built by the hooven owens rentschler company of hamilton ohio it had cylinders of 24 5 inches 62 cm 41 5 inches 105 cm and 68 inches 170 cm diameter by 48 inches 120 cm stroke it was rated at 582 nhp 2 one hundred and five vessels were completed for the ussb while this ship and four others were cancelled but completed and sold privately by the shipyards and others cancelled outright 1 the ship was laid down by northwest steel of portland oregon as yard number 38 and ussb number 2373 with the name west minsi 5 6 during construction the order for this ship was cancelled by the ussb emergency fleet corporation but construction continued for private sale 7 by the time the ship was launched on 17 november 1919 she had been sold to the green star line and assigned the name centaurus 8 the ship was completed in december 1919 and assigned the united states official number 219283 and code letters ltvh 2 7 operational history edit the first voyage of centaurus departed from astoria oregon in late december 1919 bound for callao peru 9 during the voyage one of the crewmen suffered a mental breakdown over concerns about his invalid passport 9 instead of providing medical assistance the sailor was placed in irons removed from the crew list and relisted as a stowaway then abandoned on the dockside when centaurus departed callao on 17 january 1920 9 the crewman ended up in an insane asylum where he died later that year 9 18 january 1920 the newspaper the sunday oregonian portland wrote on the page 46 green star will ply atlantic four steamers purchased here to sail from baltimore oriental run promised cruft now being built at standifer plant expected to be operated on pacific speculation as to the future field of operations of the green star steamship company which purchased four steel steamers in portland and placed orders for the construction of five more was ended last week by a formal announcement from the headquarters of the company in baltimore where the green star line has pur chased a large building to serve as a home for its shipping enterprises the last of the steamers purchased by the line here the circlnus sailed from astoria wednesday with a full cargo of lumber for melbourne and adelaide australia this cargo amounted to 4 086 103 feet it is reported by brown mccabe stevedores who had charge of loading the vessel the three other steamers purchased here by the green star line are the corvus which went in ballast to arica chile to load nitrates for europe the centaurus which took a part cargo of lumber here and went to san francisco to finish a general cargo for the west coast and the clauseus which went from here to san francisco in ballast to load beans for hamburg 10 11 later in 1920 centaurus was sold to nafra company which was affiliated with green star having intertwined financial affairs in ship acquisition 7 12 she operated for this company until 1923 when she was sold to the planet steamship company 7 in december 1929 centaurus and four other planet freighters circinius corvus clauseus and eurana were sold to the calmar steamship company 13 13 of december 1929 the newspaper oakland tribune in oakland california wrote isthmian lines house flag from 1910 to 1974 calmar buys ships the calmar line has purchased five freighters from the planet steamship company according to announcement from new york this purchase increases the calmar intercoastal fleet to eleven ships the new craft are 880 tons register the vessels involved are all well known on this coast consisting of the circinius corvus clauseus centaurus and eurana they have run into local ports for several years under the isthmian line houseflag 13 14 centaurus was renamed portmar and her port of registry was changed to new york 2 7 in 1934 her code letters were changed to kopz 15 on 13 july 1937 while on a voyage from boston massachusetts to philadelphia pennsylvania portmar collided with the handkerchief lightvessel in dense fog although she was undamaged the lightvessel was severely damaged 16 world war ii edit on 18 november 1941 portmar and seven other ships iowan mauna loa west camargo steel voyager jane christenson f j luckenbach and malama were chartered by the united states department of war to carry military supplies to the philippines 17 18 the ship was effectively delivered to the united states government on 20 november 1941 in what was a precursor of the delivery of all ocean merchant shipping to the war shipping administration with allocation to the army 19 even though details of the charters were deemed confidential the names of all eight ships were published in the los angeles times two days later 18 the japanese invasion of the philippines resulted in retention in australia 17 portmar had arrived in australia as one of the ships carrying fuel and vehicles after the earlier arrival of the diverted pensacola convoy 20 portmar had departed san francisco 26 november 1941 sailing independently with 319 vehicles 5 939 barrels of gasoline ammunition bombs machine guns and other stores for the units sailing in the pensacola convoy but was diverted while south of hawaii first to suva then to sydney with arrival there 31 december 1941 21 the ship was one of those initially chosen to attempt to run the japanese blockade of the philippines but the rapid japanese advance and occupation of rabaul kavieng and other strategic points to the north resulted in the ship being recalled to darwin 22 the maritime commission was expecting portmar along with other large vessels to be returned to the united states but the desperate need for shipping in theater had made local retention necessary 23 before 02 00 on 15 february 1942 portmar sailed from darwin as part of a convoy carrying reinforcements for the defenders of timor 24 also in the convoy were the transports usat meigs mauna loa and tulagi with an escort made up of the cruiser uss houston the destroyer uss peary and the sloops hmas warrego and hmas swan 3 portmar along with tulagi carried elements of the u s army 148th field artillery while the other ships had australian forces embarked 21 25 by 11 00 the ships had been spotted by a japanese flying boat which followed them for several hours before dropping bombs at around 14 00 with minimal effect 26 the next day another flying boat began shadowing the convoy around 09 15 and the ships were attacked by a force of 45 japanese aircraft two hours later 26 light damage and some casualties were suffered aboard manua loa while portmar was not damaged during the hour long attack 26 the likelihood of further attacks and the believed imminent invasion of timor resulted in orders to turn the convoy around received at 15 15 with all ships back at darwin by midday on 18 february 26 portmar beached after attack on darwin portmar was still in darwin harbour the next day when a force of japanese carrier based aircraft attacked the city the first time australia had been attacked 27 she was heavily damaged during the attack and was towed away from her mooring and run aground to prevent her from sinking 28 one of the crew was killed and several wounded were later recovered by the examination vessel hmas southern cross 28 29 portmar was salvaged and reconditioned by u s army port battalion troops towed to sydney and repaired 23 30 the ship was purchased at brisbane by the war department on 17 november 1942 and incorporated into the u s army s permanent local fleet as an army transport 19 23 on the morning of 15 june 1943 usat portmar loaded with ammunition and fuel left sydney for brisbane as part of convoy gp55 30 31 the convoy consisted of ten merchant ships including portmar and three landing ship tank vessels escorted by the bathurst class corvettes hmas bundaberg hmas cootamundra hmas deloraine hmas kalgoorlie and hmas warrnambool 30 portmar was the middle of three ships in the fourth column 30 portmar had trouble maintaining position during the voyage and at 17 15 on 16 june when the convoy was 35 nautical miles 65 km 40 mi east of smoky cape was passing to port of uss lst 469 to regain convoy position 30 at this time the japanese submarine i 174 fired a spread of torpedoes at the convoy from the convoy s starboard one torpedo struck uss lst 469 and another hit portmar almost immediately after 30 the volatile cargo was ignited and the order was given to abandon ship 30 portmar sank ten minutes later with two crewmen killed 30 the 71 survivors were recovered by hmas deloraine which then took uss lst 469 which had survived the attack but was immobilised and had suffered heavy casualties in tow and headed for coffs harbour 30 warrnambool and kalgoorlie depth charged the area until contact was lost they were unable to damage i 174 nor were subsequent searches able to locate her 30 the attack on convoy gp55 was the last japanese submarine attack in australian waters 32 the loss of shipping particularly the lst that was part of macarthur s seventh amphibious force forced removal of troops and supplies for the occupation of kiriwina and woodlark island the first offensive amphibious operations 31 citations edit 1 2 3 4 5 mckeller steel shipbuilding under the u s shipping board 1917 1921 contract steel ships part i p 475a 1 2 3 4 5 lloyd s of london 1930 lloyd s register steamers motorships pdf plimsoll ship data retrieved 24 june 2015 1 2 gill royal australian navy 1939 1942 p 581 lloyd s register steamers motorships pdf plimsoll ship data retrieved 24 june 2015 mckeller steel shipbuilding under the u s shipping board 1917 1921 contract steel ships part i pp 477 8 northwest steel portland or shipbuilding history 27 november 2010 archived from the original on 24 june 2015 retrieved 24 june 2015 1 2 3 4 5 mckeller steel shipbuilding under the u s shipping board 1917 1921 contract steel ships part i p 478 hull no 38 is launched 17 november 1919 p 12 retrieved 25 june 2015 1 2 3 4 astoria boy dies cruelty charged the oregon daily journal 22 october 1920 p 8 retrieved 25 june 2015 the sunday oregoxiax portland january 18 1920 green star will plys atlantic historic oregon newspaper the sunday oregonian portland ore 1881 current january 18 1920 section two image 46 united states congress house select committee on u s shipping board operations 1920 shipping board operations vol 8 washington u s government printing office p 3331 retrieved 26 june 2015 cite book cs1 maint multiple names authors list link 1 2 calmar buys ships oakland tribune 13 december 1929 p 61 retrieved 25 june 2015 calmar buys ships the newspaper oakland tribune in oakland california 13 december 1929 p 61 lloyd s of london 1934 lloyd s register navires a vapeur et a moteurs pdf plimsoll ship data retrieved 24 june 2015 casualty reports from lloyd s the times no 47737 london 15 july 1937 col e p 25 1 2 naval historical center west conob dictionary of american naval fighting ships navy department naval history and he...