Aigrette Class.

(Completed 1904.)

These two vessels are submersibles of the Laubeuf type, and were great improvements on their predecessors, the Triton Class. Their submerged displacement is 351 tons, and their dimensions 118 × 12 × 12 feet. A triple expansion steam engine of 200 H.-P. is used for surface propulsion and an electric motor of 150 H.-P. when submerged. Their speed is 10 knots and 8 ½ knots. Their maximum surface endurance is 700 miles at 8 knots, and submerged 60 miles at 6 knots. Their armament consists of one bow tube with four 18-inch torpedoes. Their complement is about fifteen officers and men.