Rynda-class (Project 80) and Diana class (Project 80bis), Russian Light Cruisers laid down 1946
The
Rynda was designed to serve as the flagship cruiser of the Baltic Fleet, armed with twin automatic 130mm dual-purpose mounts salvaged from the old cruisers
Izumrud and
Rynda. A follow-on vessel named
Diana (Project 80bis) was constructed to an almost identical design, although the flag bridge spaces were removed and a fifth 130mm turret added forward.
(See below.)
Displacement:
5,075 t light; 5,476 t standard; 6,268 t normal; 6,902 t full load
Dimensions: Length overall / water x beam x draught
525.99 ft / 508.53 ft x 50.85 ft x 15.42 ft (normal load)
160.32 m / 155.00 m x 15.50 m x 4.70 m
Armament:
8 - 5.12" / 130 mm guns (4x2 guns), 79.37lbs / 36.00kg shells, 1939 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, evenly spread, 2 raised mounts - superfiring
4 - 2.95" / 75.0 mm guns (2x2 guns), 15.43lbs / 7.00kg shells, 1946 Model
Dual purpose guns in deck mounts with hoists
on side, all amidships, all raised mounts - superfiring
16 - 1.46" / 37.0 mm guns (4x4 guns), 1.55lbs / 0.70kg shells, 1939 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
8 - 0.59" / 15.0 mm guns in single mounts, 0.10lbs / 0.05kg shells, 1946 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 722 lbs / 328 kg
Shells per gun, main battery: 650
6 - 20.9" / 530 mm above water torpedoes
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 1.57" / 40 mm 410.11 ft / 125.00 m 11.48 ft / 3.50 m
Ends: Unarmoured
Main Belt covers 124 % of normal length
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.97" / 50 mm 0.20" / 5 mm 0.98" / 25 mm
2nd: 0.59" / 15 mm 0.20" / 5 mm -
3rd: 0.59" / 15 mm 0.20" / 5 mm -
4th: 0.59" / 15 mm 0.20" / 5 mm -
- Armour deck: 0.59" / 15 mm, Conning tower: 1.97" / 50 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 67,939 shp / 50,683 Kw = 33.00 kts
Range 6,500nm at 18.00 kts
Bunker at max displacement = 1,426 tons
Complement:
351 - 457
Cost:
£3.401 million / $13.603 million
Distribution of weights at normal displacement:
Armament: 77 tons, 1.2 %
Armour: 547 tons, 8.7 %
- Belts: 300 tons, 4.8 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 28 tons, 0.4 %
- Armour Deck: 205 tons, 3.3 %
- Conning Tower: 14 tons, 0.2 %
Machinery: 1,697 tons, 27.1 %
Hull, fittings & equipment: 2,305 tons, 36.8 %
Fuel, ammunition & stores: 1,193 tons, 19.0 %
Miscellaneous weights: 450 tons, 7.2 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
6,585 lbs / 2,987 Kg = 98.2 x 5.1 " / 130 mm shells or 1.1 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 2.2 ft / 0.7 m
Roll period: 14.3 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.42
Seaboat quality (Average = 1.00): 1.12
Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.550
Length to Beam Ratio: 10.00 : 1
'Natural speed' for length: 25.59 kts
Power going to wave formation at top speed: 62 %
Trim (Max stability = 0, Max steadiness = 100): 63
Bow angle (Positive = bow angles forward): 35.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24.93 ft / 7.60 m
- Forecastle (30 %): 23.95 ft / 7.30 m
- Mid (60 %): 22.97 ft / 7.00 m (14.11 ft / 4.30 m aft of break)
- Quarterdeck (15 %): 14.11 ft / 4.30 m
- Stern: 14.11 ft / 4.30 m
- Average freeboard: 19.98 ft / 6.09 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 109.2 %
- Above water (accommodation/working, high = better): 165.0 %
Waterplane Area: 18,792 Square feet or 1,746 Square metres
Displacement factor (Displacement / loading): 125 %
Structure weight / hull surface area: 73 lbs/sq ft or 358 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.83
- Longitudinal: 1.76
- Overall: 0.90
Caution: Hull subject to strain in open-sea
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Breakdown of Miscellaneous Weights:
- 70 tons for electronics
- 30 tons for twelve 53cm reload torpedoes (two reloads per tube)
- 50 tons strengthened aft deck (for minelaying gear or helicopter)
- 30 tons for climatization gear
- 50 tons for degausing cables
- 40 tons for flag spaces
- 120 tons for 130mm automation gear and other associated weights
- 60 tons other miscellaneous weight
Electronics Suite:
- NR-132 surface and air-search radar (2 radar, 15 tons)
- NR-136 height-finding and air-search radar (1 radar, 7.5 tons)
- NR-119 navigational and air-warning radar (1 radar, 2.5 tons)
- NR-160bis fire-control radar (1 radar, 7.5 tons)
- NR-170 AA fire-control radar (2 radars, 5 tons)
- Radar jammer/detector (2 units, 2 tons)
- French-built SAGEM HF/DF (3 tons)
- Diesel emergency electric generator (5 tons)
- Two gunnery computers (fore and aft stations) (10 tons)
* * * * *
Diana (Project 80bis), Russian Light Cruiser laid down 1946
Displacement:
5,075 t light; 5,533 t standard; 6,330 t normal; 6,967 t full load
Dimensions: Length overall / water x beam x draught
525.99 ft / 508.53 ft x 50.85 ft x 15.58 ft (normal load)
160.32 m / 155.00 m x 15.50 m x 4.75 m
Armament:
10 - 5.12" / 130 mm guns (5x2 guns), 79.37lbs / 36.00kg shells, 1946 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, majority forward, 3 raised mounts - superfiring
4 - 2.95" / 75.0 mm guns (2x2 guns), 15.43lbs / 7.00kg shells, 1946 Model
Dual purpose guns in deck mounts with hoists
on side, all amidships, all raised mounts - superfiring
16 - 1.46" / 37.0 mm guns (4x4 guns), 1.55lbs / 0.70kg shells, 1946 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
8 - 0.59" / 15.0 mm guns in single mounts, 0.10lbs / 0.05kg shells, 1946 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 881 lbs / 400 kg
Shells per gun, main battery: 650
6 - 20.9" / 530 mm above water torpedoes
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 1.57" / 40 mm 410.11 ft / 125.00 m 11.48 ft / 3.50 m
Ends: Unarmoured
Main Belt covers 124 % of normal length
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.97" / 50 mm 0.20" / 5 mm 0.98" / 25 mm
2nd: 0.59" / 15 mm 0.20" / 5 mm -
3rd: 0.59" / 15 mm 0.20" / 5 mm -
4th: 0.59" / 15 mm 0.20" / 5 mm -
- Armour deck: 0.59" / 15 mm, Conning tower: 1.97" / 50 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 68,332 shp / 50,976 Kw = 33.00 kts
Range 6,500nm at 18.00 kts
Bunker at max displacement = 1,434 tons
Complement:
354 - 461
Cost:
£3.510 million / $14.040 million
Distribution of weights at normal displacement:
Armament: 93 tons, 1.5 %
Armour: 553 tons, 8.7 %
- Belts: 300 tons, 4.7 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 33 tons, 0.5 %
- Armour Deck: 205 tons, 3.2 %
- Conning Tower: 15 tons, 0.2 %
Machinery: 1,707 tons, 27.0 %
Hull, fittings & equipment: 2,372 tons, 37.5 %
Fuel, ammunition & stores: 1,255 tons, 19.8 %
Miscellaneous weights: 350 tons, 5.5 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
6,596 lbs / 2,992 Kg = 98.4 x 5.1 " / 130 mm shells or 1.1 torpedoes
Stability (Unstable if below 1.00): 1.12
Metacentric height 2.3 ft / 0.7 m
Roll period: 14.2 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.52
Seaboat quality (Average = 1.00): 1.11
Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.550
Length to Beam Ratio: 10.00 : 1
'Natural speed' for length: 25.59 kts
Power going to wave formation at top speed: 62 %
Trim (Max stability = 0, Max steadiness = 100): 63
Bow angle (Positive = bow angles forward): 35.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24.93 ft / 7.60 m
- Forecastle (30 %): 23.95 ft / 7.30 m
- Mid (60 %): 22.97 ft / 7.00 m (14.11 ft / 4.30 m aft of break)
- Quarterdeck (15 %): 14.11 ft / 4.30 m
- Stern: 14.11 ft / 4.30 m
- Average freeboard: 19.98 ft / 6.09 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 109.7 %
- Above water (accommodation/working, high = better): 163.5 %
Waterplane Area: 18,785 Square feet or 1,745 Square metres
Displacement factor (Displacement / loading): 125 %
Structure weight / hull surface area: 75 lbs/sq ft or 368 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.84
- Longitudinal: 1.78
- Overall: 0.90
Caution: Hull subject to strain in open-sea
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Breakdown of Miscellaneous Weights:
- 70 tons for electronics
- 30 tons for twelve 53cm reload torpedoes (two reloads per tube)
- 50 tons strengthened aft deck (for minelaying gear or helicopter)
- 30 tons for climatization gear
- 50 tons for degausing cables
- 120 tons for 130mm automation gear and other associated weights
Electronics Suite:
- NR-132 surface and air-search radar (2 radar, 15 tons)
- NR-136 height-finding and air-search radar (1 radar, 7.5 tons)
- NR-119 navigational and air-warning radar (1 radar, 2.5 tons)
- NR-160bis fire-control radar (1 radar, 7.5 tons)
- NR-170 AA fire-control radar (2 radars, 5 tons)
- Radar jammer/detector (2 units, 2 tons)
- French-built SAGEM HF/DF (3 tons)
- Diesel emergency electric generator (5 tons)
- Two gunnery computers (fore and aft stations) (10 tons)
* * * * *
Ships in Class:
-
Rynda (Project 80): laid down in Petrograd January 1, 1946 and completed February 28th, 1947.
-
Diana (Project 80bis): laid down in Petrograd July 1, 1946 and completed September 2nd, 1947.