WesWorld

Quoted

Varna-class, Bulgarian Flotilla Cruiser laid down 1946

Displacement:
4,134 t light; 4,499 t standard; 5,202 t normal; 5,764 t full load

Dimensions: Length overall / water x beam x draught
475.72 ft / 475.72 ft x 47.57 ft x 15.42 ft (normal load)
145.00 m / 145.00 m x 14.50 m x 4.70 m

Armament:
8 - 5.12" / 130 mm guns (4x2 guns), 79.37lbs / 36.00kg shells, 1946 Model
Automatic rapid fire guns in deck mounts with hoists
on centreline ends, evenly spread, 2 raised mounts - superfiring
8 - 2.24" / 57.0 mm guns (4x2 guns), 6.61lbs / 3.00kg shells, 1946 Model
Automatic rapid fire guns in deck mounts with hoists
on side, all amidships, all raised mounts - superfiring
16 - 0.91" / 23.0 mm guns (8x2 guns), 0.37lbs / 0.17kg shells, 1946 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 694 lbs / 315 kg
Shells per gun, main battery: 650
12 - 25.6" / 650 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 1.57" / 40 mm 262.47 ft / 80.00 m 9.84 ft / 3.00 m
Ends: 0.79" / 20 mm 147.64 ft / 45.00 m 9.84 ft / 3.00 m
65.62 ft / 20.00 m Unarmoured ends
Main Belt covers 85 % of normal length
Main belt does not fully cover magazines and engineering spaces

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.38" / 35 mm 0.79" / 20 mm 0.79" / 20 mm
2nd: 0.59" / 15 mm 0.20" / 5 mm 0.20" / 5 mm
3rd: 0.59" / 15 mm 0.20" / 5 mm -

- Conning tower: 1.38" / 35 mm

Machinery:
Oil fired boilers, steam turbines plus diesel motors,
Geared drive, 2 shafts, 69,064 shp / 51,522 Kw = 34.00 kts
Range 6,500nm at 18.00 kts
Bunker at max displacement = 1,265 tons

Complement:
306 - 398

Cost:
£3.262 million / $13.049 million

Distribution of weights at normal displacement:
Armament: 88 tons, 1.7 %
Armour: 259 tons, 5.0 %
- Belts: 216 tons, 4.2 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 34 tons, 0.7 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 9 tons, 0.2 %
Machinery: 1,725 tons, 33.2 %
Hull, fittings & equipment: 1,711 tons, 32.9 %
Fuel, ammunition & stores: 1,068 tons, 20.5 %
Miscellaneous weights: 350 tons, 6.7 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
3,143 lbs / 1,425 Kg = 46.9 x 5.1 " / 130 mm shells or 0.7 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 2.0 ft / 0.6 m
Roll period: 14.1 seconds
Steadiness - As gun platform (Average = 50 %): 69 %
- Recoil effect (Restricted arc if above 1.00): 0.53
Seaboat quality (Average = 1.00): 1.06

Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.522
Length to Beam Ratio: 10.00 : 1
'Natural speed' for length: 24.83 kts
Power going to wave formation at top speed: 65 %
Trim (Max stability = 0, Max steadiness = 100): 65
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24.61 ft / 7.50 m
- Forecastle (30 %): 23.79 ft / 7.25 m
- Mid (60 %): 22.97 ft / 7.00 m (13.94 ft / 4.25 m aft of break)
- Quarterdeck (15 %): 13.94 ft / 4.25 m
- Stern: 13.94 ft / 4.25 m
- Average freeboard: 19.82 ft / 6.04 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 132.0 %
- Above water (accommodation/working, high = better): 87.0 %
Waterplane Area: 16,005 Square feet or 1,487 Square metres
Displacement factor (Displacement / loading): 109 %
Structure weight / hull surface area: 60 lbs/sq ft or 293 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.68
- Longitudinal: 1.81
- Overall: 0.75
Caution: Hull subject to strain in open-sea
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped

Breakdown of Miscellaneous Weights:
Not yet determined.

Ships in Class:
- Varna
- Plovdiv
- Stara Zagora
- Burgas

Quoted from "Rooijen10"

4500 tons is the upper limit for a hull strength of 0.75 so according to the rules it should be okay. I do agree with speed and the expensiveness to get that speed.

Quoted from "BruceDuncan"

There's no fault, per se, in the design; I just have concerns - and I suspect that if the bow angle were changed to something beyond 1914-vintage - some of the concerns might disappear.

Quoted from "Brockpaine"

Quoted from "BruceDuncan"

There's no fault, per se, in the design; I just have concerns - and I suspect that if the bow angle were changed to something beyond 1914-vintage - some of the concerns might disappear.

Bow angle doesn't change anything in the design - with SS2, it's just a cosmetic thing. And yes, that 0-deg angle was an oversight that I need to fix. I did notice one other thing I want to tweak about the sim, too.

I might try turning some of the miscellaneous weight into deck armour, but I don't really see much need for it. This design, like the Yugoslavian flotilla cruisers I'm cribbing from, is all about the speed and the firepower. Frankly, I considered removing the armour entirely, since it's not really enough to do any good.

As to the comments about hull strength, why is there such concern about it being "low"?

Quoted from "BruceDuncan"

There is nothing wrong with the Varna in a technical sense; it's the choices one makes in designs.