aspqrz02
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Joined: 7/20/2004 Status: offline
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quote:
ORIGINAL: JWE Well, they did study Mahan, but it seems they missed some of the deeper parts. However, in terms of merchant tonnage, Japan began the war with 94 purpose-built oil tankers (401,000 GRT), out of a total of 1,962 ships (6,094,000 GRT). All the tankers were Japanese registered ships and most (iirc about 87) were constructed in Japanese yards. In 1942, Japan constructed 81 ships (242,740 GRT) of which 8 (20,344 GRT) were purpose-built oil tankers. In 1943, Japan constructed 238 ships (664,911 GRT) of which 58 (266,099 GRT) were purpose-built oil tankers. In 1944, Japan constructed 675 ships (1,632,765 GRT) of which 211 (653,895 GRT) were purpose-built oil tankers. The majority of the remaining 980,000 tons (approximately 280 ships and 810,000 GRT) were of the std A, B, and C types which were easily and routinely converted, on the ways, to tankers. Japan had substantial and sufficient liquid lift capability. The problems were lack of convoy and ASW technique, and gross scheduling inefficiency; route scheduling was taken from the merchant sector and placed in the hands of an IJA Transport Committee in mid 1943. Japan had 49 Tankers in 1940, of c. 350,000 tons capacity. She imported 3.68 million tons in the last full year before the war. However, according to ... "Kaigun: strategy, tactics, and technology in the Imperial Japanese Navy" by David C. Evans, Mark R. Peattie "Nevertheless, by the late 1930's, Japan's skyrocketing need for oil ... left the size of the civilian tanker fleet of 49 ships inadequate for the nation's needs ..." -- Kaigun, pg. #397 or thereabouts (my original notes are slightly unclear) Most of the slack was taken up from the US (80%) and the credit financing for which was from the US and which was shipped, perforce, in US hulls. "Although Japan had well over 300ktons of tanker capacity at the beginning of the Pacific War, the Navy required 270,000 tons of that [having ceased to build AOs in the 1920s], leaving only about 30000 tons for nonoperational purposes ... ... Early in the Pacific War it became clear that ... Japan would have inadequate Tanker resources to transport the oil resources that were the chief object of its strategic ambitions in 1940-41 ..." -- Kaigun, pg. #405 "As it turned out, it was indeed oil from SE Asia that both literally and figuratively fuelled the Navy's operations during the Pacific War. By 1943, however, the Combined Fleet had become tethered to its SE Asian oil spigot ... " -- Kaigun, pg. #410 Around 70ktons left over after naval needs are covered (the navy had ceased to build AOs in the 1920s and had subsidised the building of civilian TKs instead ... and expected to, and did, use them exclusively during the war) ... I'd guess most of remaining 70ktons or so were used mostly for moving POL around for the army ... to China, to the PTO etc. So how did the Japanese move fuel around for the Home Islands? Well, they captured some tanker tonnage in the initial moves (unlikely if there is a buildup of "peaceful" tension that leads to a "peaceful" occupation of the DEI ... and impossible to get UK/Allied/US tonnage if, as the extreme position goes, it all remains "peaceful") and this enabled them to stagger on till 1943 when, as noted above, they basically stationed as much of the IJN near the DEI or Borneo as possible because that is where the oil was. This freed up some of their operational requirements for shipping stuff back to the Home Islands ... at the expense of limiting their operational deployment options severely. For the rest? Well, as I noted in a previous post, they loaded the fuel into 44 gallon drums and shipped it around on standard merchantmen ... about the single most inefficient way of transporting POL in bulk short of using air transport to do it Nowhere near "substantial and sufficient" by any measure. Phil
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Author, Space Opera (FGU); RBB #1 (FASA); Road to Armageddon; Farm, Forge and Steam; Orbis Mundi; Displaced (PGD) ---------------------------------------------- Email: aspqrz@tpg.com.au
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