The main improvement was the replacement of the triple torpedo tube mounts in the older ships with quadruple mounts.

The class was fitted with three, quadruple torpedo tube mounts for twelve 21-inch torpedoes, guided by the MK 27 torpedo fire control system.

She was fitted with two above-water quadruple torpedo tube mounts for 21-inch torpedoes.

A single tube ran from the creature's abdomen to a device mounted inside the chamber, delivering needed nourishment and vitamins to the gestating fetus.

Five such tubes were mounted vertically (to fire upward) in each wing root.

Three 30-foot rangefinders were also added as well as eight torpedo tubes in twin mounts on the upper deck.

It was to carry the same 60 cm torpedo tubes in twin mounts as the earlier designs.

He saw that very clearly, for several long, thin tubes mounted on the ceiling- he'd not noticed them before; who notices ceilings?

Mahan was fitted with three, quadruple torpedo tube mounts for twelve-21 inch torpedoes, guided by the MK 27 torpedo fire control system.

Just a tube on tripods containing a 60-millimeter HEAT rocket and an optical sighting system mounted at the rear.