Project 611
| Type | SS |
|---|---|
| Soviet designation | PL |
| NATO reporting name | Zulu II |
| Country | USSR |
| Displacement (t) | 2,387 |
| Length (m) | 90.5 |
| Beam (m) | 7.5 |
| Draft (m) | 5.0 |
| Height (m) | 12.0 |
| Max speed submerged (kn) | 16.0 |
| Max speed surfaced (kn) | 18.0 |
| Max safe depth (m) | 170 |
| Endurance (days) | 75 |
| Diesel-electric | Yes |
| Titanium hull | No |
| Class year | 1955 |
Sensors
Sonar (4)
| Name | Type | Platform | Passive range (km) | Active range (km) |
|---|---|---|---|---|
| Beresta | ssp | — | — | |
| Feniks | Hull | sub | 0.9 | — |
| NEL-5 | Echo sounder | sub | — | — |
| Tamir 5L | Hull | sub | — | 0.9 |
Radar (3)
| Name | NATO name | Air search | Surface search | Fire control |
|---|---|---|---|---|
| ARP-53 | — | — | — | |
| Flag | Snoop Plate | — | Yes | — |
| MRP-10 Nakat | — | — | — |
Launchers (3)
| Name | Tubes | Fire control | Max launch depth (m) | ||||
|---|---|---|---|---|---|---|---|
533mm Torpedo Tube (forward) |
6 |
L-6-4 |
70 |
Attack |
|||
| Signal Ejector | 2 | — | 200 | ||||
Extendable devices (7)
| Name | NATO name | Capabilities | Max depth (m) | Max speed (kn) |
|---|---|---|---|---|
| ARP-53 RDF | — | Direction finder | — | 6.5 |
| Attack periscope | — | Periscope (attack) | — | 6.5 |
| Flag Radar | — | Radar | — | 6.5 |
| MRP-10 Nakat ESM | — | ESM | — | 6.5 |
| RDP | — | Snorkel | — | 6.5 |
| Search periscope | — | Periscope (observation) | — | 6.5 |
| VAN Radio antenna | — | Radio (LF, MF, HF), Radio navigation | — | 6.5 |
Individual hulls (21)
| Name | Short name | Country | Start date | End date | Remark |
|---|---|---|---|---|---|
| B-61 | B-61 | USSR | 1953-12-31 (Commissioned) | 1980-06-22 (Decommissioned) | |
| B-62 | B-62 | USSR | 1953-12-31 (Commissioned) | 1996-01-29 (Decommissioned) | |
| B-63 | B-63 | USSR | 1954-06-30 (Commissioned) | 1985-01-05 (Decommissioned) | |
| B-64 | B-64 | USSR | 1954-12-30 (Commissioned) | 1956-07-01 (Decommissioned) | |
| B-65 | B-65 | USSR | 1954-12-06 (Commissioned) | 1981-06-29 (Decommissioned) | |
| B-66 | B-66 | USSR | 1954-12-29 (Commissioned) | 1983-08-07 (Decommissioned) | |
| B-68 | B-68 | USSR | 1955-11-27 (Commissioned) | 1972-07-25 (Decommissioned) | |
| B-69 | B-69 | USSR | 1955-12-31 (Commissioned) | 1964-09-15 (Decommissioned) | |
| B-70 | B-70 | USSR | 1956-06-29 (Commissioned) | 1978-04-19 (Decommissioned) | |
| B-71 | B-71 | USSR | 1956-09-30 (Commissioned) | 1963-03-21 (Decommissioned) | |
| B-72 | B-72 | USSR | 1956-06-30 (Commissioned) | 1985-12-08 (Decommissioned) | |
| B-74 | B-74 | USSR | 1956-10-31 (Commissioned) | 1980-06-22 (Decommissioned) | |
| B-75 | B-75 | USSR | 1956-11-06 (Commissioned) | 1988-07-17 (Decommissioned) | |
| B-76 | B-76 | USSR | 1956-11-28 (Commissioned) | 1978-04-19 (Decommissioned) | |
| B-77 | B-77 | USSR | 1956-11-30 (Commissioned) | 1976-06-21 (Decommissioned) | |
| B-80 | B-80 | USSR | 1957-07-13 (Commissioned) | 1980-06-22 (Decommissioned) | |
| B-81 | B-81 | USSR | 1957-07-13 (Commissioned) | 1981-04-25 (Decommissioned) | |
| B-82 | B-82 | USSR | 1957-08-17 (Commissioned) | 1964-07-18 (Decommissioned) | |
| B-88 | B-88 | USSR | 1957-09-25 (Commissioned) | 1981-06-29 (Decommissioned) | |
| B-90 | B-90 | USSR | 1957-10-30 (Commissioned) | 1983-06-07 (Decommissioned) | |
| B-91 | B-91 | USSR | 1958-07-15 (Commissioned) | 1964-09-15 (Decommissioned) |