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FIGHTING SHIPS OF THE WORLD
PORTUGAL
SUBMARINES
medium submarines


Ships


Name No Yard No Builder Laid down Launched Comp Fate
i     CRDA, Monfalcone, Italy 10.1931 27.11.1936 8.1937 // --- completed for Italy (Argo)
ii     CRDA, Monfalcone, Italy 10.1931 12.12.1936 9.1937 // --- completed for Italy (Velella)


Technical data


Displacement standard, t689
Displacement normal, t

780 / 1000

Length, m

63.2

Breadth, m

6.93

Draught, m

4.46

No of shafts

2

Machinery

2 Fiat diesels / 2 CRDA electric motors

Power, h. p.

1500 / 800

Max speed, kts

14 / 8

Fuel, t

diesel oil 60 (norm.)

Endurance, nm(kts)5300(14) / 100(3)
Armament

1 x 1 - 100/47 OTO 1931, 2 x 2 - 13.2/76, 6 - 533 TT (4 bow, 2 stern, 10)

Electronic equipmenthydrophone
Complement

46

Diving depth operational, m90


Standard scale images


<i>Argo</i> 1940
Argo 1940


Project history

Ordered by Portugal in 1931, but soon the contract has been terminated, and in 1935 it is redeemed by Italian Government for own Navy. The design was developed by builder as moderated variant of Balilla class. Partially double-hulled. Successful medium submarines with high endurance and easy manoeuvrability. Rather low speed became an appreciable lack. They served as prototype for wartime built submarines of Flutto class.