Cachalot and Cuttlefish

Design and Construction Notes

It was originally intended to build two additional copies of the preceding Dolphin design for the final two V-boats. But, bowing to pressure from international treaties that limited total submarine displacement, and by strong advocacy from small-submarine elements within the Submarine Officer's Conference and the General Board, the two Fiscal Year 1932 boats were built to a smaller size and displacement. Cachalot's construction was assigned to Portsmouth, and Cuttlefish was contracted to Electric Boat, breaking a seven-year gap in construction for EB.

In the original construction authorization for the V-class dating back to 1916, these two boats were known as V-8 and V-9. However, by the time the construction contracts were signed, their names had been changed to comply with the new naming system. Thus, these boats never officially carried the V-class names.

EB was eager to get back into the submarine construction business, so they asked for and received permission to make several changes to the basic design as developed by the USN Bureau of Construction & Repair. They were able to provide separate crew's berthing and messing, and they expanded the use of welding in the hull fabrication, although both Cachalot and Cuttlefish were built to a partial riveted/partial welded construction method. Cuttlefish was also the first boat in the fleet to receive an air-conditioning plant, with its use so successful that all of the fleet submarines were subsequently refitted with one, and all future boats were built with a plant as original equipment. The Torpedo Data Computer (TDC), a mechanical computer used to provide a firing solution for torpedoes, was first tested in these boats, proving the concept.

While generally successful, these boats were ultimately too small and had too short a range for the role of operating with the fleet in the vast Pacific. After several non-productive war patrols in the early months of WWII, they were retired back to the States and served well as training boats for the remainder of the war.

Cachalot (SS-170)

U.S. Navy photo

Cachalot underway in the mid 1930's

See more Cachalot photos

Cuttlefish (SS-171)

NARA photo #19-N-15260 via Navsource.org

Cuttlefish on post commissioning trials, late summer of 1934.

See more Cuttlefish photos

Page created by:
Ric Hedman & David Johnston
1999 - 2023 - PigBoats.COM^©
Mountlake Terrace, WA, Norfolk, VA
webmaster at pigboats dot com