Characteristics
| Type | Kaidai I (I-51) | Kaidai II (I-152) | Kaidai IIIa (I-153) | Kaidai IIIb (I-156) | Kaidai IV (I-61) | |
| Displacement | Surfaced | 1,390 long tons (1,412 t) | 1,390 long tons (1,412 t) | 1,635 long tons (1,661 t) | 1,635 long tons (1,661 t) | 1,575 long tons (1,600 t) |
| Submerged | 2,430 long tons (2,469 t) | 2,500 long tons (2,540 t) | 2,300 long tons (2,337 t) | 2,300 long tons (2,337 t) | 2,300 long tons (2,337 t) | |
| Length (overall) | 91.44 m (300 ft 0 in) | 100.85 m (330 ft 10 in) | 100.58 m (330 ft 0 in) | 101.00 m (331 ft 4 in) | 97.70 m (320 ft 6 in) | |
| Beam | 8.81 m (28 ft 11 in) | 7.64 m (25 ft 1 in) | 7.98 m (26 ft 2 in) | 7.90 m (25 ft 11 in) | 7.80 m (25 ft 7 in) | |
| Draft | 4.60 m (15 ft 1 in) | 5.14 m (16 ft 10 in) | 4.83 m (15 ft 10 in) | 4.90 m (16 ft 1 in) | 4.83 m (15 ft 10 in) | |
| Depth | 6.02 m (19 ft 9 in) | 6.71 m (22 ft 0 in) | 6.71 m (22 ft 0 in) | 6.70 m (22 ft 0 in) | 6.70 m (22 ft 0 in) | |
| Power plant and shaft | 4 × Sulzer Mk.2 diesels 4 shafts |
2 × Sulzer Mk 3 diesels 2 shafts |
2 × Sulzer Mk 3 diesels 2 shafts |
2 × Sulzer Mk 3 diesels 2 shafts |
2 × Rauschenbach Mk 2 diesels 2 shafts |
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| Power | Surfaced | 5,200 bhp | 6,800 bhp | 6,800 bhp | 6,800 bhp | 6,000 bhp |
| Submerged | 2,000 shp | 1,800 shp | 1,800 shp | 1,800 shp | 1,800 shp | |
| Speed | Surfaced | 18.4 knots (34.1 km/h) | 20.1 knots (37.2 km/h) | 20.0 knots (37.0 km/h) | 20.0 knots (37.0 km/h) | 20.0 knots (37.0 km/h) |
| Submerged | 8.4 knots (15.6 km/h) | 7.7 knots (14.3 km/h) | 8.0 knots (14.8 km/h) | 8.0 knots (14.8 km/h) | 8.5 knots (15.7 km/h) | |
| Range | Surfaced | 20,000 nmi (37,000 km) at 10 knots (19 km/h) | 10,000 nmi (19,000 km) at 10 knots (19 km/h) | 10,000 nmi (19,000 km) at 10 knots (19 km/h) | 10,000 nmi (19,000 km) at 10 knots (19 km/h) | 10,000 nmi (19,000 km) at 10 knots (19 km/h) |
| Submerged | 100 nmi (190 km) at 4 knots (7.4 km/h) | 100 nmi (190 km) at 4 knots (7.4 km/h) | 90 nmi (170 km) at 3 knots (5.6 km/h) | 60 nmi (110 km) at 3 knots (5.6 km/h) | 60 nmi (110 km) at 3 knots (5.6 km/h) | |
| Test depth | 45.7 m (150 ft) | 45.7 m (150 ft) | 60.0 m (196.9 ft) | 60.0 m (196.9 ft) | 60.0 m (196.9 ft) | |
| Fuel | 508 tons | 284.5 tons | 241.8 tons | 230 tons | 230 tons | |
| Complement | 70 | 58 | 63 | 63 | 58 | |
| Armament (initial) | • 8 × 533 mm (21 in) TTs (6 × bow, 2 × aft) • 24 × 6th Year Type torpedoes • 1 × 120 mm (4.7 in) L/45 3rd Year Type Naval gun |
• 8 × 533 mm (21 in) TTs (6 × bow, 2 × aft) • 16 × 6th Year Type torpedoes • 1 × 120 mm (4.7 in) L/45 3rd Year Type Naval gun • 1 × 76.2 mm (3.00 in) L/23.5 AA gun |
• 8 × 533 mm (21 in) TTs (6 × bow, 2 × aft) • 16 × 6th Year Type torpedoes • 1 × 120 mm (4.7 in) L/40 11th Year Type Naval gun • 1 × 7.7 mm MG |
same as Kaidai IIIa | • 6 × 533 mm (21 in) TTs (4 × bow, 2 × aft) • 14 × Type 89 torpedoes • 1 × 120 mm (4.7 in) L/40 11th Year Type Naval gun • 1 × 7.7 mm MG |
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| Type | Kaidai V (I-165) | Kaidai VIa (Earlier batch, I-168) | Kaidai VIa (Latter batch, I-171) | Kaidai VIb (I-174) | |
| Displacement | Surfaced | 1,575 long tons (1,600 t) | 1,400 long tons (1,422 t) | same as Earlier batch | 1,420 long tons (1,443 t) |
| Submerged | 2,330 long tons (2,367 t) | 2,440 long tons (2,479 t) | 2,564 long tons (2,605 t) | ||
| Length (overall) | 97.70 m (320 ft 6 in) | 104.70 m (343 ft 6 in) | 105.00 m (344 ft 6 in) | ||
| Beam | 8.20 m (26 ft 11 in) | 8.20 m (26 ft 11 in) | 8.20 m (26 ft 11 in) | ||
| Draft | 4.70 m (15 ft 5 in) | 4.58 m (15 ft 0 in) | 4.60 m (15 ft 1 in) | ||
| Depth | 7.05 m (23 ft 2 in) | 7.00 m (23 ft 0 in) | 7.00 m (23 ft 0 in) | ||
| Power plant and shaft | 2 × Sulzer Mk.3 diesels 2 shafts |
2 × Kampon Mk.1A Model 8 diesels, 2 shafts | 2 × Kampon Mk 1A Model 8 diesels, 2 shafts | ||
| Power | Surfaced | 6,000 bhp | 9,000 bhp | 9,000 bhp | |
| Submerged | 1,800 shp | 1,800 shp | 1,800 shp | ||
| Speed | Surfaced | 20.5 knots (38.0 km/h) | 23.0 knots (42.6 km/h) | 23.0 knots (42.6 km/h) | |
| Submerged | 8.2 knots (15.2 km/h) | 8.2 knots (15.2 km/h) | 8.2 knots (15.2 km/h) | ||
| Range | Surfaced | 10,000 nmi (19,000 km) at 10 knots (19 km/h) | 14,000 nmi (26,000 km) at 10 knots (19 km/h) | 10,000 nmi (19,000 km) at 16 knots (30 km/h) | |
| Submerged | 60 nmi (110 km) at 3 knots (5.6 km/h) | 65 nmi (120 km) at 3 knots (5.6 km/h) | 90 nmi (170 km) at 3 knots (5.6 km/h) | ||
| Test depth | 75.0 m (246.1 ft) | 70.0 m (229.7 ft) | 85.0 m (278.9 ft) | ||
| Fuel | 230 tons | 341 tons | 442 tons | ||
| Complement | 62 | 68 | 68 | ||
| Armament (initial) | • 6 × 533 mm (21 in) TTs (4 × bow, 2 × aft) • 14 × Type 89 torpedoes • 1 × 100 mm (3.9 in) L/50 Type 88 AA gun • 1 × 12.7 mm AA gun • 1 × 7.7 mm MG |
• 6 × 533 mm (21 in) TTs (4 × bow, 2 × aft) • 14 × Type 89 torpedoes • 1 × 100 mm (3.9 in) L/50 Type 88 AA gun • 1 × 13.2 mm AA gun • 1 × 7.7 mm MG |
• 6 × 533 mm (21 in) TTs (4 × bow, 2 × aft) • 14 × Type 89 torpedoes • 1 × 120 mm (4.7 in) L/40 11th Year Type Naval gun • 1 × 13.2 mm AA gun • 1 × 7.7 mm MG |
• 6 × 533 mm (21 in) TTs (4 × bow, 2 × aft) • 14 × Type 89 torpedoes • 1 × 120 mm (4.7 in) L/40 11th Year Type Naval gun • 1 × 13.2 mm AA gun |
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