Charles Brun.
(Completed 1912.)
The fourth experimental vessel, built at Cherbourg during 1909–12. The submerged displacement is 450 tons and the length 145 feet. Steam turbines of 1,300 H.-P. drive her at 15 ½ knots an hour on the surface, and electric motors of 500 H.-P. at 10 knots when submerged. Her armament consists of six 18-inch torpedoes. The complement is 22 officers and men.