.jpg) Louis Dupetit-Thouars, date unknown
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| Class overview | |
|---|---|
| Name | O'Byrne class |
| Operators |  French Navy |
| Preceded by | Type UB II |
| Succeeded by | 600 Series |
| Built | 1917–1920 |
| In service | 1921–1935 |
| Completed | 3 |
| Retired | 3 |
| General characteristics | |
| Type | Submarine |
| Displacement | 342 tons (surfaced) |
| Length | 52.4 m (171 ft 11 in) |
| Beam | 4.7 m (15 ft 5 in) |
| Draught | 2.7 m (8 ft 10 in) |
| Propulsion | 2 Schneider diesel engines, 2 electric motors, 2 shafts |
| Speed | 14 knots (26 km/h; 16 mph) (surfaced) |
| Range | 1,850 nmi (3,430 km; 2,130 mi) at 10 knots (19 km/h; 12 mph) |
| Complement | 25 |
| Armament |
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The O'Byrne-class submarines were a class of three submarines built for the French Navy from 1917 to 1921. They were originally ordered by the Romanian Navy, but were confiscated by the French government while still under construction. Three ships of the type were built between 1917 and 1921 at the Schneider shipyard in Chalon-sur-Saône. They were commissioned in the French Navy, serving in the Mediterranean Sea. The ships were removed from the Navy list between 1928 and 1935. The first ship of its class was named in honour of French submariner Gabriel O'Byrne.