Project 639 [1956 draft]
| Displacement, t | |
| surface | 9,100 |
| Underwater | 10,020 |
| Main dimensions, m | |
| long | 114,1 meters / 371 feet |
| width | 11,4 |
| Precipitation average | 7,5 |
| Depth of immersion, m | |
| working | 320 |
| limit | 400 |
| Autonomy by provisions, days | 60 |
| Crew, people | 104 |
| Power plant | |
| number x type of NR | 2 x VVR or 2 x LMT |
| Technical | |
| number x capacity of GTZA, hp | 2 x 25 000 or 2 x 35 000 [22 *] |
| number x type of propellers | 2 x VFSH |
| Auxiliary number x power (type) RSD, kW. | 2 x 450 (HED on the shaft line) |
| Speed, knots | |
| largest submerged under the GTRA | 22.5-23.5 or 25-26 * |
| largest surface above the GTPA | 15 |
| Armament | |
| Rocket |
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| Torpedo |
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| Radioelectronics |
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