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A teardrop hull is a submarine hull design which emphasizes submerged performance over surfaced performance. It was somewhat commonly used in the early stages of submarine development, but was gradually abandoned in the early 20th century in favour of designs optimized for high performance on the surface as a result of changes in operational doctrine.
USS Albacore (AGSS-569) is a unique research submarine that pioneered the American version of the teardrop hull form (sometimes referred to as an "Albacore hull") of modern submarines. The revolutionary design was derived from extensive hydrodynamic and wind tunnel testing, with an emphasis on underwater speed and maneuverability. [4]
This design, already visible on very early submarines, is called a "teardrop hull". It is structurally efficient for withstanding external pressure, and significantly reduces the hydrodynamic drag on the sub when submerged, but decreases the sea-keeping capabilities and increases drag while surfaced.
Submarines of the United States Navy are built in classes, using a single design for a number of boats. Minor variations occur as improvements are incorporated into the design, so later boats of a class may be more capable than earlier. Also, boats are modified, sometimes extensively, while in service, creating departures from the class standard.
The design was primarily single-hull, with a double hull around the torpedo room and AMS for ballast tanks. The design was improved on the Threshers, the one-off Tullibee, and subsequent attack submarines by relocating the torpedo room into the operations compartment via angled midships torpedo tubes to make room for a large sonar sphere in the ...
They were the first production warships built with the teardrop-shape hull first tested on the experimental USS Albacore, and the first to combine the control room, attack center, and conning tower in the same space in the hull. They were of double hull design with 1.5-inch thick HY80 steel. This class of submarine became part of the United ...
The Yuan class submarines have a teardrop-shaped hull and are believed to be double-hulled. [16] [17] They also have a angled casing, which appears like a distinctive hump. [18] [16] While earlier variants of the Yuan class have a large upright sail, newer variants have instead a more angled sail. [18] [19]
In addition, the submarines are based on the U.S. Navy Barbel class with the teardrop hull design, which results in the submarines producing less noise. [10] The propulsion of the Zwaardvis class is also different from the Dolfijn-class submarines, for example, it has a single propeller instead of the two propellers the latter has.