Silas Bent-class survey ship

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USNS Elisha Kent Kane (T-AGS-27) underway in 1984.jpeg
USNS Elisha Kent Kane (T-AGS-27) underway in 1984
General characteristics
TypeAGS-26 (Silas Bent) class survey ship
Tonnage1,935 tons
Displacement2,580 tons
Length285 ft 3 in (86.94 m)
Beam48 ft (15 m)
Draft15 ft (4.6 m)
PropulsionALCO diesels, Allis-Chalmers electric drive, single shaft. SHP approx. 3000 + 350 SHP trainable and retractable, gas turbine powered, bow propulsion unit to assist station-keeping and ultra-quiet ship operations. [1]
Speed15 knots
Complement44 crew, 26 scientific party
ArmamentNone

The Silas Bent class is frequently found applied to four ships though the Naval Vessel Register and some sources officially break them into the subclasses of AGS-26 [2] and AGS-33. [3] Silas Bent was the first of the first four purpose built ships for U.S. Navy surveys. Previous ships had been modifications of various naval types.

Contents

Bent (AGS-26) and Kane (AGS-27)

Two ships were built to essentially the same design at two different yards.

Wilkes (AGS-33) and Wyman (AGS-34)

USNS Wyman T-AGS-34.jpg
NAVOCEANO (Naval Oceanographic Office) Bulletin, March 1994 photo of USNS Wyman (T-AGS-34) captioned: "Refurbishments provides ship with extensive shallow-water survey capability"
General characteristics
TypeAGS-33 Wilkes class survey ship
Tonnage1,935 tons
Displacement2,540 tons
Length286 ft 7+12 in (87.363 m) [7]
Beam48 ft (15 m)
Draft17 ft (5.2 m) (including sonar domes)
PropulsionALCO diesels, Allis-Chalmers electric drive, single shaft. SHP approx. 3400 [7] + bow propulsion unit.
Speed15 knots
Complement42 crew, 28 scientific party
ArmamentNone

The AGS-26 and AGS-33 (Wilkes) subclass ships were externally almost identical with slightly different modernized internal configuration reflecting their being laid down (July 1968) three years after Bent's delivery to the Navy 23 July 1965 (See photos at references). The two AGS-33 ships are USNS Wilkes (T-AGS-33) [8] and USNS Wyman (T-AGS-34) [9]

USNS Wilkes (AGS-33) and USNS Wyman (AGS-34) were laid down on the same day, 18 July 1968, at the same shipyard, Defoe Shipbuilding Company, Bay City, Michigan.

Configuration and Data Systems

The ships were designed to be capable of surveys supporting hydrographic and bathymetric charting and oceanographic requirements. They differed chiefly in installed equipment and systems, particularly data acquisition systems.

The initial Bent installation was a prototype "Shipboard Survey System" based on a standard Navy AN/UYK computer. [1]

Later Bent was equipped with the Oceanographic Data Acquisition System (ODAS), operational 1971, as were the later oceanographic survey ships Kane and Wilkes. The Wyman replaced USNS Sgt. George D Keathley (T-AGS-35) for geophysical, particularly gravity, and bathymetric surveys. [10]

Wyman was equipped first with the Hydrographic Data Acquisition System (HYDAS) [7] that was replaced in the mid-1970s by a new narrow beam swath system with its own specialized data acquisition system. The swath array, replacing the single beam system, was the Bottom Topography Survey Subsystem (BOTOSS) and the processing system, replacing HYDAS, was the Bathymetric Survey System (BASS). [11]

See also

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USNS Kane (T-AGS-27) was a Silas Bent-class survey ship acquired by the United States Navy and delivered to Military Sealift Command in 1967. Kane spent her career performing oceanographic surveys. The ship was equipped with the Oceanographic Data Acquisition System (ODAS) as were oceanographic survey ships USNS Silas Bent (T-AGS-26) and USNS Wilkes (T-AGS-33).

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References

  1. 1 2 Naval Oceanographic Office (11 February 1966). "USNS Silas Bent (T-AGS-26) Introduction Brochure". Naval Oceanographic Office pub. dated 11 February 1966. Naval Oceanographic Office (copy hosted at NavSource). Retrieved 4 March 2012.
  2. "SILAS BENT (AGS-26)". Naval Vessel Register. U.S. Navy. Retrieved 4 March 2012.
  3. "WILKES (AGS 33) SURVEYING SHIP". Naval Vessel Register. U.S. Navy. Retrieved 4 March 2012.
  4. "USNS Silas Bent (T-AGS-26)". NavSource Online: Service Ship Photo Archive. NavSource. Retrieved 4 March 2012.
  5. "USNS Elisha Kent Kane (T-AGS-27)". NavSource Online: Service Ship Photo Archive. NavSource. Retrieved 4 March 2012.
  6. "Kane AGS-27". Naval Vessel Register. Retrieved 4 July 2015.
  7. 1 2 3 Naval Oceanographic Office. "USNS Wyman (T-AGS-34) Welcome Aboard brochure, inside pages (.jpg image)". Naval Oceanographic Office (copy hosted at NavSource). Retrieved 4 March 2012.
  8. "USNS Wilkes (T-AGS-33)". NavSource Online: Service Ship Photo Archive. NavSource. Retrieved 4 March 2012.
  9. "USNS Wyman (T-AGS-34)". NavSource Online: Service Ship Photo Archive. NavSource. Retrieved 4 March 2012.
  10. United States, President (1972). The Federal Ocean Program : The Annual Report of the President to the Congress on the Nation's Efforts to Comprehend, Conserve, and Use the Sea (PDF). Washington, D.C.: Government Printing Office. pp. 66–68.
  11. Sullivan, Roy L. (29 Apr 1976). "ARL Technical Support during BOTOSS (abstract)". Archived from the original on February 27, 2012. Retrieved 4 March 2012.