Project 678 / Project 1851
Nelma class / X-Ray class
| Specifications | |
|---|---|
| NATO codification | X-Ray / Nelma / Paltus |
| Designer: | SPMBM "Malachite" |
| Builder: | United Admiralty Shipyard 196 |
| Displacement (tons): |
(project 1851) 529-550 tons surfaced 1,000 submerged, or (project 1851.1) 730-1,000 tons surfaced 1,450 submerged |
| Operational Depth: | Up to 1000 meters / +3,000 feet |
| Length | 40 meters [or 63 meters] |
| Maximum length (at design waterline) |
(project 1851) 44 m (project 1851.1) 55 m |
| Beam | 5.3 meters |
| Draft (at design waterline) | 5 meters |
| Propulsion: | 1 pressurised water nuclear reactor 10 Mwt Steam turbines ?,000 shp |
| Speed (surface) | 20 knots |
| Speed (underwater) | 6 knots |
| Armament: | none |
| Sonar: | HF active arrays |
| Crew: | |
