NAVYPEDIA

Photo

Dolphin

Ships

No	Name	Yard No	Builder	Laid down	Launched	Comm	Fate
SS169	Dolphin (ex-V7)		Portsmouth N Yd	6.1930	8.3.1932	7.1932	stricken 10.1945

Technical data

Displacement standard, t
Displacement normal, t	1688 / 2215
Length, m	97.3
Breadth, m	8.51
Draught, m	3.99
No of shafts	2
Machinery	2 MAN diesels + 2 MAN diesel-generators / 2 electric motors
Power, h. p.	3500 / 1750
Max speed, kts	17 / 8
Fuel, t	diesel oil 412
Endurance, nm(kts)	6000 (10) / 50 (5)
Armament	1 x 1 - 102/50 Mk 9, 4 x 1 - 7.6/90, 6 - 533 TT (18, 4 bow, 2 stern)
Electronic equipment	QB, JK sonars
Complement	63
Diving depth operational, m	75

Standard scale images

Graphics

Project history

More close to the end of 1920th in the USA there was a withdrawal from usual earlier tendency to growth of displacement of submarines. Surface displacement up to 3000t т of course allowed to ensure big endurance, but thus all remaining characteristics unfairly worsened. In 1927 the basic requirements to submarine for operations in the Eastern Pacific been prepared, according to which endurance was dropped to 12000nm, and self-sufficiency to 60 days. Speed admitted to less important characteristic, than manoeuvrability and torpedo armament. Simultaneously the artillery armament was considered possible to shrink to one 127mm gun. Surface displacement was limited at 1600t.

According to these requirements Dolphin project was prepared. The first attempt of creation of ocean patrol submarine was appeared not quite successful: Dolphin suffered insufficient hull strength, the endurance did not hold out to the design.

Double-hulled. Machinery contained two main diesels with direct drive and two diesel-generators for battery recharging. 102/50 gun soon after completion was replaced by lighter 76mm.

Modernizations

1933 - 1934: - 1 x 1 - 102/50, 4 x 1 - 7.6/90; + 1 x 1 - 76/50 Mk 17/18, 2 x 1 - 12.7/90

late 1930s: - QB sonar; + QC, JG sonars

1940s: + SD, SJ radars

Naval service

No significant events.