Plongeur (French for "Diver") was a French submarine launched on 16 April 1863. She was the first submarine in the world to be propelled by mechanized (rather than human) power.
Model of Plongeur at the Deutsches Museum, Munich, showing the lifeboat detachedDrawings for Plongeur
In 1859 the Board of Construction (Conseil des travaux) called naval engineers for designs for a submarine and reviewed three, choosing that submitted by Siméon Bourgeois (later Admiral) and Charles Brun, naming the project Plongeur[2] with the code name Q00.
The submarine used a compressed-air engine, propelled by stored compressed air powering a reciprocating engine.[3] The air was contained in 23 tanks holding air at 12.5bar (1.25MPa, 180psi), taking up a huge amount of space (153m³/5,403ft³), and requiring the submarine to be of unprecedented size. The engine had a power of 60kW (80hp), and could propel the submarine for 5nmi (9km), at a speed of 4kn (7.2km/h).
Compressed air was also used to empty its ballast tanks, which had a volume of 53m³ (1,872ft³). Ballast was 212t (234tons), including a security ballast of 34t (37tons).
The submarine was armed with a ram to break holes in the hull of enemy ships, and an electrically fired spar torpedo, fixed at the end of a pole,[4] though later Admiral Bourgeois (who was, after 1871, chairman of the Commission on Submarine Defenses) opposed the use of torpedoes as the primary weapon in commerce warfare.[5]
The submarine was 43m (140ft) long and 381t (420tons) in displacement.
A support ship, the Cachalot, followed her in order to resupply the compressed air necessary to her propulsion.
A small lifeboat (8 × 1.7m; 26 × 5.6ft) was provided for the escape of the 12-man complement.
On 6 October 1863, Plongeur made her first trials by sailing down the Charente River, to the harbour of the Cabane Carrée.
On 2 November 1863, Plongeur was towed to Port-des-Barques, where her first underwater trials were planned. Because of poor weather conditions, the submarine was eventually towed to La Pallice and then to the harbour (Bassin à flot) of La Rochelle
On 14 February 1864, during trials in the Bassin à flot, the engine raced due to an excessive admission of compressed air, and the submarine bumped into the quay. Trials were stopped.
On 18 February 1864, Plongeur was towed to La Pallice and dived to 9m (30ft).
Stability problems due to its length limited the submarine to dives to a maximum depth of 10m (33ft). The front of the submarine would tend to dive first, hitting the bottom, so that the submarine would glide forward. Pumps were installed to compensate for the tilt, but proved too slow to be effective. The installation of longitudinal rudders would have improved stability as later demonstrated by the submarines Gymnote and Gustave Zédé .
After various experiments, she was stricken by the French Navy on 2 February 1872.
Conversion
Submarine Plongeur in use as a water tanker in the early 20th century.
The submarine was reactivated as an automotive water tanker, equipped with a compound 2-cylinder steam engine of 90kW (120hp), on 1 January 1873. She was assigned to the harbour of Rochefort. She was equipped with a new engine in 1898, transferred from a torpedo boat (Torpilleur No 74).
In 1927, upon the closure of the arsenal at Rochefort, she was transferred to the Mediterranean at Toulon, where she was used to supply the 1st and 3rd squadrons with water.
She was decommissioned on 25 December 1935, and sold for 25,143 francs to a M. Negai on 26 May 1937.[citation needed]
Garier, Gérard (n.d.). L'odyssée technique et humaine du sous-marin en France[The Technical and Human Odyssey of the Submarine in France: From Plongeur (1863) to Guêpe (1904)] (in French). Vol.1: Du Plongeur (1863) aux Guêpe (1904). Bourg-en-Bresse, France: Marines édition. ISBN2-909675-19-X.
Jones, Colin (1996). "Entente Cordiale, 1865". In McLean, David & Preston, Antony (eds.). Warship 1996. London: Conway Maritime Press. ISBN0-85177-685-X.
Roberts, Stephen S. (2021). French Warships in the Age of Steam 1859–1914: Design, Construction, Careers and Fates. Barnsley, UK: Seaforth Publishing. ISBN978-1-5267-4533-0.
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