Retired AF Guy said:
Actually, I couldn't find anything on the range/depth capabilities of the Gotland class. As a comparison the German U-214 class which is also uses an AIP system has a range of 12,000 nm (surface) or submerged - 420 nmi @ 8 kt/1,248 nmi @ 4 kt. The U-214 was tested to a depth of 214m, with a theoretical depth of 400m.
The U-214 seems a tad bigger, but the Upholders are 10m larger than the Gotland class
Gotland class
The A26 is planned to be capable of both littoral and deep blue sea operations.
isplacement: Surfaced: 1,494 tonnes (1,470 long tons)
Submerged: 1,599 tonnes (1,574 long tons)
Length: 60.4 m (198 ft 2 in)
Beam: 6.2 m (20 ft 4 in)
Draft: 5.6 m (18 ft 4 in)
Propulsion: 2× Diesel-electric MTU engines
2× Kockums v4-275R Stirling AIP units
Speed: Surfaced: 11 knots (20 km/h)
Submerged: 20 knots (37 km/h) on batteries; 5 knots (9.3 km/h) on AIP
U-214
Displacement: 1,690 t (surfaced), 1,860 t (submerged)
Length: 213 feet 3 inches (65.0 m)
Beam: 20 feet 8 inches (6.3 m)
Draught: 19 feet 8 inches (6.0 m)
Propulsion: Diesel-electric, fuel cell AIP, low noise skew back propeller
Speed: 12 kt surfaced
20 kt submerged
Range: 12,000 miles (19,300 km) surfaced
420 nmi (780 km) @ 8 kt
1,248 nmi (2,311 km) @ 4 kt
Upholder Class
Displacement: 2,455 tons
Length: 70.26 m
Beam: 7.2 m
Draught: 7.6 m
Propulsion: Diesel-electric- 1 shaft
2 × Paxman Valenta 2,035 hp (1.517 MW) 1600 RPA SZ diesels (3.035 MW total)
1 × GEC electric motor (5 MW)
Speed: 12 knots (surface)
20+ knots (submerged)
Range: 8,000 nmi (15,000 km; 9,200 mi)