for Submariners

by Hamilton 1:1 Communications, LLC

Migraine II SSR Conversion - Radar Picket

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Although  both the Requin and Spinax, as initially converted, were relatively successful in their new rolls, from the very start the conversion showed flaws that were hard to ignore or overlook. Because of the submarines’ low silhouettes, the effective range of the radars was seriously handicapped and breaking seas over the deck aft caused nightmares with the SV-2 height finders.


The modifications of the Requin and Spinax included moving the surface search radar and the removal of the stern torpedo tubes, but the height finder stayed put on the deck aft. Both the MIGRAINE I and II boats were fitted with AN/BPQ-2 guidance equipment for the Regulus cruise missiles.

USS Requin (SSR-841) Tench Class

USS Requin (SSR-481) Migraine II

Requin (SS-481) keel was laid down on 24 August 1944 by the Portsmouth Navy Yard, Portsmouth, N.H.; launched on 1 January 1945 and commissioned on 28 April 1945.

Following shakedown off the New England coast, Requin departed Portsmouth on 3 June 1945 en route to Hawaii. She joined the Pacific Fleet on 13 July at Balboa and at the end of the month reached Pearl Harbor. Two weeks after her arrival, however, World War II ended and Requin, by then en route to Guam, was recalled and ordered back to the Atlantic.

Requin converted to a Radar Pickett Submarine at Portsmouth Naval Shipyard, Portsmouth, NH in 1946. After leaving the yard she resumed operations in the western Atlantic and in the fall of 1947 moved north for exercises above the Arctic Circle. Reclassified (SSR-481) in January 1948, Requin was transferred to SubRon 8 at New London in June and in May 1949 sailed east for her first deployment with the 6th Fleet. Arriving at Gibraltar on 14 May, she operated in the Mediterranean until 30 June.

In October 1968 Requin began inactivation at Norfolk. Decommissioned on 3 December 1968, she was sent to St. Petersburg, Fla., in February 1969 and served there as a Naval Reserve Training ship until struck from the Navy list 20 December 1971.

Boats Converted:

USS Requin (SS-481) Tench
USS Spinax (SS-489) Tench




312' length
27' 4” Beam
1,525 tons Surfaced Displacement
2,410 tons Submerged Displacement
95 Crew


4 x 21” TT Bow
1 x 40mm Deck Gun (Removed later)


SS Radar
SV Radar
SV-2 Radar
SR-2 Radar
YE-3 Homing Beacon
AN/BPQ-2 guidance equipment