The Phénix-class submarine was planned to be a series of 13 submarines for the French Navy. The design was a larger version of the intended for operations in East Asia but was cancelled due to the Fall of France.
Development and design The Phénix-class design was envisioned to be an enlarged version of the intended for long cruises in East Asia and East Indies. The lengthened hull was used to hold more fuel which extended the design's range, which was planned to also house air conditioning and other equipment for a tropical environment. The lead boat—Phénix—was ordered in 1939 and a further 12 in 1940, which were named Brumaire, Floréal, Frimaire, Fructidor, Germinal, Messidor, Nivôse, Phénix, Pluviôse, Prairial, Thermidor, Vendémiaire, and Ventôse. None were laid down, and were cancelled following the Fall of France.
The design featured a length between perpendiculars of with a beam of and a draught of . The boats displaced 1,056 tons surfaced and 1,252 tons submerged, and carried a complement of 45. Propulsion was provided by two shafts driven by diesel engines for surface running and electric motors for submerged operations, producing surfaced and submerged. This machinery enabled a maximum speed of surfaced and submerged. The submarines carried 121 tons of fuel oil. Armament consisted of ten torpedo tubes, one anti-aircraft gun, and one anti-aircraft gun.
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