|Name||No||Yard No||Builder||Laid down||Launched||Comp||Fate|
|Humaitá||OTO, Livorno, Italy||11/1925||11.6.1927||7/1929||stricken 11.1950|
|Displacement standard, t||
|Displacement normal, t||1450 / 1884|
|No of shafts||
2 Ansaldo diesels / 2 Savigliano electric motors
|Power, h. p.||
4000 / 1000
|Max speed, kts||
18.5 / 10
|Fuel, t||diesel oil|
|Endurance, nm(kts)||12840(10)/ 120(4)|
1 x 1 - 120/41 Ansaldo, 2 x 1 - 13.2/76, 6 - 533 TT (4 bow, 2 stern, 12), 16 mines
|Diving depth operational, m||100|
Submarine cruiser, ordered in 1925 on the means obtained from sale of battleship Deodoro to Mexico. Improved variant of Italian Balilla class. Twin-hulled. For endurance increase two 425hp Fiat auxiliary diesels-generators were installed for battery recharging. Submarine was arranged by folding bow diving planes. Besides torpedoes, Humaitá carried 16 Ansaldo mines, placing in two horizontal tubes at aft end. 120mm/41 gun originally took place in rotating turret in front of a fin, but soon after commission was rearranged to deck. Building of Humaitá has been ended in the late 1927, but submarine was remained on the shipyard on one and a half year because of a protraction of ultimate payment by Brazilian party.
No significant events.