Mir-class SS report

Mir-class, Borea light cruiser laid down 1928 (Engine 1933)

Displacement:
	7 847 t light; 8 155 t standard; 8 498 t normal; 8 773 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
	(579,73 ft / 567,26 ft) x 54,13 ft x (20,01 / 20,49 ft)
	(176,70 m / 172,90 m) x 16,50 m  x (6,10 / 6,25 m)

Armament:
      8 - 5,98" / 152 mm 52,0 cal guns - 114,42lbs / 51,90kg shells, 240 per gun
	  Breech loading guns in turret on barbette mounts, 1924 Model
	  4 x Twin mounts on centreline ends, evenly spread
		2 raised mounts - superfiring
      4 - 4,02" / 102 mm 45,0 cal guns - 32,65lbs / 14,81kg shells, 200 per gun
	  Dual purpose guns in deck mounts, 1921 Model
	  4 x Single mounts on sides, aft deck forward
      10 - 0,91" / 23,0 mm 58,0 cal guns - 0,40lbs / 0,18kg shells, 600 per gun
	  Anti-air guns in deck mounts, 1926 Model
	  10 x Single mounts on sides, evenly spread
      Weight of broadside 1 050 lbs / 476 kg
      Main Torpedoes
      8 - 17,7" / 450 mm, 19,69 ft / 6,00 m torpedoes - 0,981 t each, 7,845 t total
	In 2 sets of deck mounted side rotating tubes
      Mines
      60 - 2 469,18 lbs / 1 120,00 kg mines - 66,139 t total
	in Above water - Stern racks/rails
      Main DC/AS Mortars
      120 - 220,46 lbs / 100,00 kg Depth Charges - 11,810 t total
	in Stern depth charge racks

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	5,12" / 130 mm	368,44 ft / 112,30 m	9,51 ft / 2,90 m
	Ends:	1,97" / 50 mm	198,82 ft / 60,60 m	9,51 ft / 2,90 m
	  Main Belt covers 100% of normal length
	  Main belt does not fully cover magazines and engineering spaces

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	5,12" / 130 mm	2,99" / 76 mm		5,91" / 150 mm
	2nd:	0,98" / 25 mm	0,98" / 25 mm		      -

   - Armoured deck - multiple decks:
	For and Aft decks: 1,97" / 50 mm
	Forecastle: 0,98" / 25 mm  Quarter deck: 0,98" / 25 mm

   - Conning towers: Forward 7,99" / 203 mm, Aft 0,00" / 0 mm

Machinery:
	Oil fired boilers, steam turbines,
	Geared drive, 3 shafts, 79 988 shp / 59 671 Kw = 32,35 kts
	Range 6 589nm at 10,00 kts
	Bunker at max displacement = 618 tons

Complement:
	442 - 575

Cost:
	£2,702 million / $10,810 million

Distribution of weights at normal displacement:
	Armament: 381 tons, 4,5%
	   - Guns: 268 tons, 3,1%
	   - Weapons: 113 tons, 1,3%
	Armour: 1 982 tons, 23,3%
	   - Belts: 868 tons, 10,2%
	   - Armament: 401 tons, 4,7%
	   - Armour Deck: 641 tons, 7,5%
	   - Conning Tower: 72 tons, 0,8%
	Machinery: 2 331 tons, 27,4%
	Hull, fittings & equipment: 3 154 tons, 37,1%
	Fuel, ammunition & stores: 651 tons, 7,7%
	Miscellaneous weights: 0 tons, 0,0%

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  8 861 lbs / 4 019 Kg = 82,7 x 6,0 " / 152 mm shells or 1,7 torpedoes
	Stability (Unstable if below 1.00): 1,00
	Metacentric height 2,0 ft / 0,6 m
	Roll period: 16,2 seconds
	Steadiness	- As gun platform (Average = 50 %): 59 %
			- Recoil effect (Restricted arc if above 1.00): 0,44
	Seaboat quality  (Average = 1.00): 1,02

Hull form characteristics:
	Hull has rise forward of midbreak,
	  a normal bow and a round stern
	Block coefficient (normal/deep): 0,484 / 0,488
	Length to Beam Ratio: 10,48 : 1
	'Natural speed' for length: 23,82 kts
	Power going to wave formation at top speed: 57 %
	Trim (Max stability = 0, Max steadiness = 100): 58
	Bow angle (Positive = bow angles forward): 18,00 degrees
	Stern overhang: 3,90 ft / 1,19 m
	Freeboard (% = length of deck as a percentage of waterline length):
				Fore end,	 Aft end
	   - Forecastle:	30,00%,  26,38 ft / 8,04 m,  22,97 ft / 7,00 m
	   - Forward deck:	25,00%,  22,97 ft / 7,00 m,  22,97 ft / 7,00 m
	   - Aft deck:	30,00%,  13,12 ft / 4,00 m,  13,12 ft / 4,00 m
	   - Quarter deck:	15,00%,  13,12 ft / 4,00 m,  13,12 ft / 4,00 m
	   - Average freeboard:		18,95 ft / 5,77 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 101,6%
		- Above water (accommodation/working, high = better): 149,7%
	Waterplane Area: 20 167 Square feet or 1 874 Square metres
	Displacement factor (Displacement / loading): 111%
	Structure weight / hull surface area: 96 lbs/sq ft or 469 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0,97
		- Longitudinal: 1,34
		- Overall: 1,00
	Adequate machinery, storage, compartmentation space
	Excellent accommodation and workspace room