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Passive Underwater Fire Control Feasibility System (or Study) (PUFFS) was a passive sonar system for submarines. It was designated AN/BQG-4 and was primarily equipped on United States Navy conventional submarines converted to GUPPY III or otherwise modernized in the 1960s. It was also equipped on the nuclear-powered USS Tullibee (SSN-597) and a version known as "Micropuffs" was fitted on Oberon-class submarines for the Royal Australian Navy. The system was notable for three tall, streamlined domes topside. The system was retained on several submarines transferred to foreign navies. It was associated with long-range passive detection of targets for the Mark 45 nuclear torpedo and other torpedoes as well. Most submarines backfitted with it were also lengthened 12-15 feet to accommodate additional electronics and plotting rooms. It was also planned for Thresher and Sturgeon-class nuclear submarines, but was not fitted on them.^[1] All PUFFS-equipped submarines have been disposed of or preserved as museum ships.

References

^ Friedman, Norman (1995). U.S. Submarines Through 1945: An Illustrated Design History. Annapolis, Maryland: United States Naval Institute. pp. 16–17, 43. ISBN 1-55750-263-3.

Alden, John D., Commander (USN Ret) (1979). The Fleet Submarine in the U.S. Navy: A Design and Construction History. London: Arms and Armour Press. ISBN 0-85368-203-8.{{cite book}}: CS1 maint: multiple names: authors list (link) CS1 maint: ref duplicates default (link)
Sub vs Sub, Cdr R Compton Hall, Orion Books, 1989

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[1] Friedman, Norman (1995). U.S. Submarines Through 1945: An Illustrated Design History. Annapolis, Maryland: United States Naval Institute. pp. 16–17, 43. ISBN 1-55750-263-3.

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 [[File:USS Harder (SS-568).jpg|thumb|{{USS|Harder|SS-568}} with the three distinctive shark-fin PUFFS domes]]
-'''Passive Underwater Fire Control Feasibility System''' (or Study) ('''PUFFS''') was a [[passive sonar]] system for [[submarine]]s. It was designated AN/BQG-4 and was primarily equipped on [[United States Navy]] conventional submarines converted to [[GUPPY]] III or otherwise modernized in the 1960s. It was also equipped on the nuclear-powered {{USS|Tullibee|SSN-597}}. The system was notable for three tall, streamlined domes topside. The system was retained on several submarines transferred to foreign navies. It was associated with long-range passive detection of targets for the [[Mark 45 torpedo|Mark 45 nuclear torpedo]] and other torpedoes as well. Most submarines backfitted with it were also lengthened 12-15 feet to accommodate additional electronics and plotting rooms. It was also planned for [[Thresher-class submarine|''Thresher'']] and [[Sturgeon-class submarine|''Sturgeon'']]-class [[nuclear submarine]]s, but was not fitted on them.<ref>{{cite book| last = Friedman| first = Norman| authorlink =| title = U.S. Submarines Through 1945: An Illustrated Design History| publisher = [[United States Naval Institute]]| year = 1995| location = [[Annapolis, Maryland]]| pages = 16-17, 43| url =| doi =| isbn = 1-55750-263-3 }}</ref> All PUFFS-equipped submarines have been disposed of or preserved as museum ships.
+'''Passive Underwater Fire Control Feasibility System''' (or Study) ('''PUFFS''') was a [[passive sonar]] system for [[submarine]]s. It was designated AN/BQG-4 and was primarily equipped on [[United States Navy]] conventional submarines converted to [[GUPPY]] III or otherwise modernized in the 1960s. It was also equipped on the nuclear-powered {{USS|Tullibee|SSN-597}} and a version known as "Micropuffs" was fitted on [[Oberon-class submarine]]s for the [[Royal Australian Navy]]. The system was notable for three tall, streamlined domes topside. The system was retained on several submarines transferred to foreign navies. It was associated with long-range passive detection of targets for the [[Mark 45 torpedo|Mark 45 nuclear torpedo]] and other torpedoes as well. Most submarines backfitted with it were also lengthened 12-15 feet to accommodate additional electronics and plotting rooms. It was also planned for [[Thresher-class submarine|''Thresher'']] and [[Sturgeon-class submarine|''Sturgeon'']]-class [[nuclear submarine]]s, but was not fitted on them.<ref>{{cite book| last = Friedman| first = Norman| authorlink =| title = U.S. Submarines Through 1945: An Illustrated Design History| publisher = [[United States Naval Institute]]| year = 1995| location = [[Annapolis, Maryland]]| pages = 16-17, 43| url =| doi =| isbn = 1-55750-263-3 }}</ref> All PUFFS-equipped submarines have been disposed of or preserved as museum ships.
 == See also ==