Mark 18 torpedo

Mark 18 torpedo

The Mark 18 torpedo was an electric torpedo used by the US Navy during World War II.

The Mark 18 was built in competition to the Bureau of Ordnance electric torpedoes, which had been in development at the Newport Torpedo Station (NTS), Newport, Rhode Island, since the 1920s,[1] in particular the Mark II, originated in 1941 in collaboration with General Electric and Electric Storage Battery Company (Exide)[2]

In 1942, several German G7e electric torpedoes ran ashore,[3] leading CNO, Admiral Ernest J. King, to prod BuOrd into building an electric torpedo for the U.S. Navy's own submarines. BuOrd told NTS to get the Mark 2 in shape, or drop it in favor of a copy, with the primary emphasis being speed of introduction. "Newport, typically, preferred its own finely machined project",[4] but neither General Electric nor NTS had the facilities. As a result, BuOrd had to turn to Westinghouse Electric & Manufacturing Company, which on 10 March 1942 got all data and designs for electric torpedoes NTS had produced so far.[5]

Westinghouse quickly decided to copy the G7e, and "went to work with a speed and fervor that was dazzling"[6] (certainly in comparison to NTS's languid pace). Design was complete by mid-April, and a contract for 2,000 Mark 18s, 2,020 warheads, 543 exercise heads (for training shots), tools, spares, and workshop gear was issued 2 May. The first test models were delivered just 15 weeks after Westinghouse started work[7] and the Mark 18 was promised to the Submarine Force by summer 1942.[8]

Then the trouble started. The batteries (provided by Exide)[9] did not deliver hoped-for performance and gave off too much hydrogen gas[10] (a hazard for fire shipboard, and potentially lethal in submarines), and there were bugs in production, in part because of the fine tolerances necessary and the need to use unskilled labor.[11] NTS, as usual, "offered no help",[12] refusing even to pass on trial data.[13] Trials, supervised by Commander Oliver G. Kirk (whose Lapon was sent to Newport to aid in testing in July 1943),[14] aided by "Spike" Hottel (relieved from command of Grouper in October),[15][16] did not go well. Eli Reich, Lapon's exec, described NTS's attitude as near to sabotage.[17] Kirk and Reich drafted a scathing memo, which ended up on the desk of Admiral Lockwood, who took the matter to William H. "Spike" Blandy, Chief of BuOrd, who (after months of disparaging submariners over the problems with the Mark 14, and while still complaining he could not get a good project officer from Lockwood) agreed to push the Mark 18 ahead.[18]

The first submarines to use Mark 18s (still not perfected) were Eugene Sands' Spearfish and Mush Morton's Wahoo[19] in September 1943.[20] Wahoo disappeared, and Sands "experienced enough torpedo problems to drive an ordinary man berserk":[21] one sank, one broached and ran wild, three fishtailed at launch and hit the outer doors before disappearing, and seven missed astern.[22] His results, as described by his squadron commander, "Gin" Styer, in a masterpiece of understatement, "were disappointing".[23]

The main advantage was they did not produce a wake of bubbles or turbine exhaust pointing back to the submarine firing it - a major advantage in daytime engagements. The torpedo also lacked the depth-keeping and exploder problems that had plagued the Mark 14. The disadvantages were the low speed compared to the Mark 14's 45 knots, the need to regularly withdraw the torpedoes from their tubes for recharging, sensitivity of the batteries to water temperature,[24] and onerous maintenance procedures. The Mark 18 shared one major flaw with the Mark 14: it had no protection against circular runs, a defect which claimed Tang for certain, and possibly other U.S. submarines, as well; "Donc" Donaho's Flying Fish was nearly sunk by a trial model in October 1943.[25]

Some 30% of torpedoes fired by U.S. submarines in the Pacific War were Mark 18s.[26]

The design was dropped from service in 1950 in favor of faster and more reliable later types.[27]

The Mark 18 was 20 ft (6 m) long, weighed 3,154 lb (1430 kg), had a warhead of 575 lb (260 kg) of Torpex with a contact exploder, and had a speed of 29 kt (54 km/h, 33 mph) and a maximum range of 4,000 yards (3,650 m). By July 1944, an improved version had appeared.[28][29] These torpedoes were easier to build than the wet heater types, using about ⅔ of the labor of the Mark 14.[citation needed]


  1. ^ Blair, Clay, Jr. Silent Victory (New York: Bantam, 1976), p.280.
  2. ^ Blair, p.280.
  3. ^ Blair, p.280.
  4. ^ Blair, p.280.
  5. ^ Blair, p.281.
  6. ^ Blair, p.281.
  7. ^ Blair, p.280.
  8. ^ Blair, p.402.
  9. ^ Blair, p.403.
  10. ^ Blair, p.280.
  11. ^ Blair, p.280.
  12. ^ Blair, p.280.
  13. ^ Blair, p.403.
  14. ^ Blair, pp.402 and 469,
  15. ^ Blair, p.479.
  16. ^ Wikipedia, Grouper.
  17. ^ Blair, p.402.
  18. ^ Blair, p.404 & passim.
  19. ^ Blair, p.510.
  20. ^ Blair, p.939.
  21. ^ Blair, p.511.
  22. ^ Blair, p.511. The Mark 14, at least, would leave the tube correctly.
  23. ^ Blair, p.511.
  24. ^ Blair, p.509.
  25. ^ Blair, pp.513 & 939.
  26. ^ Blair, pp.694fn and 818.
  27. ^ USA Torpedoes of World War II
  28. ^ Blair, p.694fn.
  29. ^ Ordnance Pamphlet No. 946 U.S. Navy Torpedo Mark 18 (Electric) Description, Adjustment, Care, and Operation

External links

Wikimedia Foundation. 2010.

Игры ⚽ Поможем написать реферат

Look at other dictionaries:

  • Mark 14 torpedo — A Mark 14 torpedo on display at Fisherman s Wharf in San Francisco Place of origin United States …   Wikipedia

  • Mark 50 torpedo — Mark 50 Advanced Lightweight Torpedo …   Wikipedia

  • Mark 45 torpedo — The Mark 45 anti submarine torpedo (aka ASTOR) was a submarine launched wire guided nuclear torpedo designed by the United States Navy for use against high speed, deep diving, enemy submarines. The 19 inch (480 mm) diametre torpedo was… …   Wikipedia

  • Mark 10 torpedo — Place of origin United States Service history In service 1915 1947 Wars World War II …   Wikipedia

  • Mark-37-Torpedo — Ein Torpedo Mark 37, aufgenommen in Submarine Museum USS Bowfin, Pearl Harbor, Hawaii Allgemein …   Deutsch Wikipedia

  • Mark 37 torpedo — The Mark 37 torpedo …   Wikipedia

  • Mark-18-Torpedo — Allgemeine Angaben Bezeichnung: Torpedo Mark 18 Herkunftsland: USA Hersteller: Westinghouse Electric …   Deutsch Wikipedia

  • Mark-50-Torpedo — Mark 50 Torpedo …   Deutsch Wikipedia

  • Mark-54-Torpedo — Ein Mark 54 Leichtgewichtstorpedo an Bord der USS Ross (DDG 71) Allgemeine Angaben …   Deutsch Wikipedia

  • Mark 48 torpedo — For the machine gun, see Mk 48 machine gun. Mark 48 torpedo Type Heavyweight torpedo …   Wikipedia

  • Mark 46 torpedo — Mk 46 is also the designation of the Mk 46 Mod 0 variant of the M249 light machine gun Mark 46 torpedo A Mk 46 exercise torpedo launched from USS Mustin …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”