Submarines of the Laubeuf type with a submerged displacement of nearly 600 tons. All built at Cherbourg. The Brumaire and Frimaire are driven by petrol motors of 700 H.-P. when cruising on the surface, but all the others have small steam turbines with a special type of flash-boiler. Electric motors are used for submerged propulsion. Their speed is 12 knots above and 9 knots below. The armament is seven 18-inch torpedoes. Their complement is 22 officers and men.
Fresnel Class.
(Completed 1908–12.)
- Fresnel.
- Berthelot.
- Papin.
- Monge.
- Ampère.
- Gay-Lussac.
- Cagnot.
- Faraday.
- Giffard.
- Montgolfier.
- Newton.
- Volta.
- Watt.
- Euler.
- Faucault.
- Franklin.
- Arago.
- Permouilli.
- Joule.
- Coulomb.
- Curie.
- Le Verrier.
Twenty-two submarines of the largest sea-going Laubeuf type. Only three of these are steam driven, the others using heavy-oil engines for surface propulsion. They are in all respects similar to vessels of the Pluviôse class, and have a displacement of about 600 tons. Their speed is 12 knots above, and 9 knots below, and the armament seven 18-inch torpedoes. These vessels are fitted with stern as well as bow tubes. Their surface cruising range is over 2,000 miles.
Amiral Bourgeoise.
(Completed 1912.)
An experimental boat of the Bourdelle type, built at Cherbourg. The submerged displacement is just under 800 tons and the length 190 feet. She is driven on the surface by heavy-oil engines of 1,600 H.-P., which give a speed of 15 knots. The electric motors for submerged propulsion are of 700 H.-P., giving a speed of 10 knots. The armament consists of seven 18-inch torpedoes, and the cruising range is 3,500 miles.
Archimède.
(Completed 1912.)