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 installed on United States Navy conventional submarines built in the 1950s beginning with the Tang class, and also those converted to GUPPY III or otherwise modernized in the 1960s. It was also equipped on the nuclear-powered USS Tullibee (SSN-597). It was also installed on the USS Thomas Edison (SSBN610) but never achieved operational status. Its transducers can be seen on pictures of the vessel. A version known as "Micropuffs" was fitted on Oberon-class submarines for the Royal Australian Navy, and as Type 2041 on the Upholder-class for the British Royal Navy. This class still serves in the Royal Canadian Navy as the Victoria clas
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| - Passive Underwater Fire Control Feasibility System (it)
- Passive Underwater Fire Control Feasibility System (en)
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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 installed on United States Navy conventional submarines built in the 1950s beginning with the Tang class, and also those converted to GUPPY III or otherwise modernized in the 1960s. It was also equipped on the nuclear-powered USS Tullibee (SSN-597). It was also installed on the USS Thomas Edison (SSBN610) but never achieved operational status. Its transducers can be seen on pictures of the vessel. A version known as "Micropuffs" was fitted on Oberon-class submarines for the Royal Australian Navy, and as Type 2041 on the Upholder-class for the British Royal Navy. This class still serves in the Royal Canadian Navy as the Victoria clas (en)
- Il sistema PUFFS, acronimo di Passive Underwater Fire Control Feasibility System (o Study), era la designazione del sonar passivo per sottomarini AN/BQG-4. Il sistema era principalmente presente nei sommergibili convenzionali della United States Navy costruiti negli anni cinquanta e nei battelli sottoposti ad ammodernamento GUPPY III o altrimenti modernizzati nel corso degli anni sessanta. Il sistema ha equipaggiato anche il sottomarino USS Tullibee (SSN-597) a propulsione nucleare. Una versione nota come "Micropuffs" ha equipaggiato i sottomarini classe Oberon della Royal Australian Navy e con la designazione Type 2041 sui sottomarini della classe Upholder della britannica Royal Navy, ultimi sommergibili convenzionale della Royal Navy, che dopo essere stati ceduti alla Royal Canadian Navy (it)
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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 installed on United States Navy conventional submarines built in the 1950s beginning with the Tang class, and also those converted to GUPPY III or otherwise modernized in the 1960s. It was also equipped on the nuclear-powered USS Tullibee (SSN-597). It was also installed on the USS Thomas Edison (SSBN610) but never achieved operational status. Its transducers can be seen on pictures of the vessel. A version known as "Micropuffs" was fitted on Oberon-class submarines for the Royal Australian Navy, and as Type 2041 on the Upholder-class for the British Royal Navy. This class still serves in the Royal Canadian Navy as the Victoria class, where Micropuffs is known as BQG-501. The system was notable for three tall, fin-like domes topside, except on Micropuffs installations. The system was retained on several submarines transferred by the US to foreign navies. It was associated with long-range passive detection of targets for the Mark 45 nuclear torpedo and other weapons. Most submarines backfitted with it were also lengthened 12–16 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 except Micropuffs experimentally on Barb and Haddock. With the exception of the four Canadian Victoria-class submarines, all PUFFS-equipped submarines have been disposed of or preserved as museum ships. (en)
- Il sistema PUFFS, acronimo di Passive Underwater Fire Control Feasibility System (o Study), era la designazione del sonar passivo per sottomarini AN/BQG-4. Il sistema era principalmente presente nei sommergibili convenzionali della United States Navy costruiti negli anni cinquanta e nei battelli sottoposti ad ammodernamento GUPPY III o altrimenti modernizzati nel corso degli anni sessanta. Il sistema ha equipaggiato anche il sottomarino USS Tullibee (SSN-597) a propulsione nucleare. Una versione nota come "Micropuffs" ha equipaggiato i sottomarini classe Oberon della Royal Australian Navy e con la designazione Type 2041 sui sottomarini della classe Upholder della britannica Royal Navy, ultimi sommergibili convenzionale della Royal Navy, che dopo essere stati ceduti alla Royal Canadian Navy sono stati denominati classe Victoria, dove il Micropuffs è designato come BQG-501. Il sistema si notava per le tre alte cupole a forma di pinna, ad eccezione delle installazioni Micropuffs ed è stato mantenuto su diversi sottomarini trasferiti a marine straniere, tra cui l'USS Harder, in servizio nella Marina Militare dal 1974 al 1988 con il nome di Romeo Romei. Il sistema era anche associato al rilevamento passivo a lungo raggio di bersagli e al controllo di siluri, tra cui il siluro nucleare . La maggior parte dei sommergibili equipaggiati con tale sistema vennero allungati di 12-16 piedi per ospitare l'elettronica aggiuntiva e i locali di controllo. Il sistema venne progettato anche per i sottomarini nucleari delle classi Thresher e Sturgeon, che non vennero però equipaggiati con tale sistema, tranne il Micropuffs sperimentalmente su Barb e Haddock. Ad eccezione dei quattro sottomarini canadesi della classe Victoria, tutti i sottomarini equipaggiati con il sistema PUFFS sono stati dismessi o conservati come battelli museali. (it)
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