 She displaced surfaced, and submerged.Her two bow torpedo tubes featured unique, cloverleaf-shaped design hatches that rotated on a central axis, and the boat was designed to carry up to four torpedoes.For surface running, "U-6" was outfitted with 2 gasoline engines, but suffered from inadequate ventilation, which resulted in frequent intoxication of the crew; her underwater propulsion was by two electric motors.