Russian Navy Ships

[Delta Force]

Here is the first battleship for the Russian Navy. This is my first tumblehome design and the ship has extensive ammunition and fuel stores in keeping with Russian/French practice.

Tumblehome BB1, Russia Battleship laid down 1890

Displacement:
   11,680 t light; 12,583 t standard; 13,776 t normal; 14,729 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (378.00 ft / 370.00 ft) x 75.50 ft x (27.75 / 29.19 ft)
   (115.21 m / 112.78 m) x 23.01 m  x (8.46 / 8.90 m)

Armament:
      4 - 12.00" / 305 mm 40.0 cal guns - 749.99lbs / 340.19kg shells, 180 per gun
     Breech loading guns in turret on barbette mounts, 1890 Model
     2 x Single mounts on centreline ends, evenly spread
     2 x Single mounts on sides amidships
      8 - 6.00" / 152 mm 45.0 cal guns - 89.99lbs / 40.82kg shells, 720 per gun
     Breech loading guns in turret on barbette mounts, 1890 Model
     4 x Twin mounts on side ends, evenly spread
      4 - 3.00" / 76.2 mm 50.0 cal guns - 20.00lbs / 9.07kg shells, 900 per gun
     Breech loading guns in deck mounts, 1890 Model
     4 x Single mounts on sides, evenly spread
      Weight of broadside 3,800 lbs / 1,724 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   14.0" / 356 mm   240.00 ft / 73.15 m   8.00 ft / 2.44 m
   Ends:   6.00" / 152 mm   130.00 ft / 39.62 m   8.00 ft / 2.44 m
   Upper:   6.00" / 152 mm   240.00 ft / 73.15 m   8.00 ft / 2.44 m
     Main Belt covers 100 % of normal length
     Main Belt inclined -30.00 degrees (positive = in)

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   14.0" / 356 mm   6.00" / 152 mm      8.00" / 203 mm
   2nd:   6.00" / 152 mm   2.00" / 51 mm      4.00" / 102 mm

   - Armoured deck - single deck:
   For and Aft decks: 2.00" / 51 mm
   Forecastle: 2.00" / 51 mm  Quarter deck: 2.00" / 51 mm

   - Conning towers: Forward 8.00" / 203 mm, Aft 8.00" / 203 mm

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 14,423 ihp / 10,760 Kw = 18.00 kts
   Range 6,000nm at 10.00 kts
   Bunker at max displacement = 2,146 tons (100% coal)

Complement:
   635 - 826

Cost:
   £1.143 million / $4.572 million

Distribution of weights at normal displacement:
   Armament: 852 tons, 6.2 %
      - Guns: 852 tons, 6.2 %
   Armour: 4,273 tons, 31.0 %
      - Belts: 2,026 tons, 14.7 %
      - Armament: 1,184 tons, 8.6 %
      - Armour Deck: 865 tons, 6.3 %
      - Conning Towers: 198 tons, 1.4 %
   Machinery: 2,671 tons, 19.4 %
   Hull, fittings & equipment: 3,882 tons, 28.2 %
   Fuel, ammunition & stores: 2,096 tons, 15.2 %
   Miscellaneous weights: 2 tons, 0.0 %
      - Hull below water: 2 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     16,992 lbs / 7,707 Kg = 19.7 x 12.0 " / 305 mm shells or 1.8 torpedoes
   Stability (Unstable if below 1.00): 1.14
   Metacentric height 4.2 ft / 1.3 m
   Roll period: 13.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 76 %
         - Recoil effect (Restricted arc if above 1.00): 0.94
   Seaboat quality  (Average = 1.00): 1.84

Hull form characteristics:
   Hull has a flush deck,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.740 / 0.752
   Length to Beam Ratio: 5.83 : 1
   'Natural speed' for length: 19.24 kts
   Power going to wave formation at top speed: 53 %
   Trim (Max stability = 0, Max steadiness = 100): 41
   Bow angle (Positive = bow angles forward): -10.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  28.00 ft / 8.53 m,  25.00 ft / 7.62 m
      - Forward deck:   30.00 %,  25.00 ft / 7.62 m,  22.00 ft / 6.71 m
      - Aft deck:   35.00 %,  22.00 ft / 6.71 m,  22.00 ft / 6.71 m
      - Quarter deck:   15.00 %,  22.00 ft / 6.71 m,  22.00 ft / 6.71 m
      - Average freeboard:      23.29 ft / 7.10 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 90.1 %
      - Above water (accommodation/working, high = better): 157.8 %
   Waterplane Area: 23,184 Square feet or 2,154 Square metres
   Displacement factor (Displacement / loading): 106 %
   Structure weight / hull surface area: 128 lbs/sq ft or 626 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.86
      - Longitudinal: 3.61
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Tumblehome hull.

[Tanthalas]

IDK about 6" guns but I seam to recall reading that baral life for a 12" gun was only like 90-100 shells, so wouldnt that be roughly double what it could safely fire (I know shooting a rifle with a shot out barrel is dangerous as hell), and 720 shells man... Just WOW, can you come up with any referance to support that absolutly Huge Number?

[Delta Force]

IDK about 6" guns but I seam to recall reading that baral life for a 12" gun was only like 90-100 shells, so wouldnt that be roughly double what it could safely fire (I know shooting a rifle with a shot out barrel is dangerous as hell), and 720 shells man... Just WOW, can you come up with any referance to support that absolutly Huge Number?

The French battleship Iéna carried enough shells for its guns for three hours of nonstop firing.

[snip]

Were to even begin

First, turn 0 begins 1895.
Second: WAY to much ammo on all of those guns. Way to much. Those are exeive amounts of secondary shells for a 1950's Anti Aircraft Cruiser with automatics. Try about 1/2 of what you have for all guns.
Third: The disposition of the battery is, shall we say, odd & leaves the deck cramped. What is the reasoning behind this?
Fourth: Conning Towers seem a bit thin to me. Maybe go to one thicker one?
Fith: Your belts are very short hight wise. This is only made worse by the tumblehome. Try making them taller.
Sixth: Barbettes are very thin as well. They should be within 1" of the main belt IMO.
Seventh: The 6" guns will need to be in casemates to comply with the rules
Eighth: Recoil is very high at .94
Ninth: The forward sheer seems a bit out of period to me for a BB. Have you tried a flush for'castle?
Tenth: Overall, aside from the speed, IMO my BBs of the same time would eat this gal for lunch.

Overall, I personally find this to be a very poor design, even without the rule violations that are present.

[Delta Force]

First, turn 0 begins 1895.

I thought we were allowed to and encouraged to construct ships prior to 1895.

Second: WAY to much ammo on all of those guns. Way to much. Those are exeive amounts of secondary shells for a 1950's Anti Aircraft Cruiser with automatics. Try about 1/2 of what you have for all guns.

I was basing it off the Iéna, which had vast quantities of ammunition for its weapons.

Third: The disposition of the battery is, shall we say, odd & leaves the deck cramped. What is the reasoning behind this?

It's a modified Jauréguiberry, except with the 10.8 inch guns replaced by 12 inch guns.

Fourth: Conning Towers seem a bit thin to me. Maybe go to one thicker one?
Sixth: Barbettes are very thin as well. They should be within 1" of the main belt IMO.

Another player once told me that conning towers and barbettes don't need to have armor as thick as belts and other flat surfaces because their shape makes ricochets and glancing blows more likely.

Fith: Your belts are very short hight wise. This is only made worse by the tumblehome. Try making them taller.

I forgot to account for the height reduction from the surface being angled, so I will revise for version 2.

Seventh: The 6" guns will need to be in casemates to comply with the rules

That would be my bad too, was copying the French design directly. I'll change them out.

Eighth: Recoil is very high at .94

The weaponry on the real ship had restricted arcs on the guns to prevent blast damage, so that actually is rather accurate.

Ninth: The forward sheer seems a bit out of period to me for a BB. Have you tried a flush for'castle?

The ship I was basing it does have a slight angle on the forward part of the ship in some pictures. It is closer to being a flush decker however and I exaggerated it in my Springsharp.

[Delta Force]

I modified the design and while working on it I decided to branch it off into two separate designs. The first design lost a knot of speed, taking it down to 17 knots where most foreign battleships are. The second design has its hull shape changed and other alterations made for higher speeds, making it capable of 20 knots (giving it a three knot advantage over typical designs).

Tumblehome BB1v2D, Russia Battleship laid down 1895

Displacement:
   10,460 t light; 10,926 t standard; 11,910 t normal; 12,698 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (378.00 ft / 370.00 ft) x 69.50 ft (Bulges 75.50 ft) x (27.75 / 29.30 ft)
   (115.21 m / 112.78 m) x 21.18 m (Bulges 23.01 m)  x (8.46 / 8.93 m)

Armament:
      4 - 12.00" / 305 mm 40.0 cal guns - 749.99lbs / 340.19kg shells, 60 per gun
     Breech loading guns in turret on barbette mounts, 1895 Model
     2 x Twin mounts on centreline ends, evenly spread
      12 - 6.00" / 152 mm 45.0 cal guns - 80.01lbs / 36.29kg shells, 180 per gun
     Breech loading guns in casemate mounts, 1895 Model
     12 x Single mounts on sides, evenly spread
      8 - 3.00" / 76.2 mm 50.0 cal guns - 20.00lbs / 9.07kg shells, 360 per gun
     Breech loading guns in deck mounts, 1895 Model
     8 x Single mounts on centreline ends, evenly spread
      8 raised mounts
      Weight of broadside 4,120 lbs / 1,869 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   14.0" / 356 mm   240.00 ft / 73.15 m   12.00 ft / 3.66 m
   Ends:   6.00" / 152 mm   130.00 ft / 39.62 m   8.00 ft / 2.44 m
   Upper:   6.00" / 152 mm   240.00 ft / 73.15 m   8.00 ft / 2.44 m
     Main Belt covers 100 % of normal length
     Main Belt inclined -30.00 degrees (positive = in)

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   14.0" / 356 mm   8.00" / 203 mm      12.0" / 305 mm
   2nd:   3.00" / 76 mm         -               -

   - Armoured deck - single deck:
   For and Aft decks: 2.00" / 51 mm
   Forecastle: 2.00" / 51 mm  Quarter deck: 2.00" / 51 mm

   - Conning towers: Forward 12.00" / 305 mm, Aft 12.00" / 305 mm

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 10,081 ihp / 7,521 Kw = 17.00 kts
   Range 6,000nm at 10.00 kts
   Bunker at max displacement = 1,771 tons (100% coal)

Complement:
   569 - 741

Cost:
   £0.948 million / $3.793 million

Distribution of weights at normal displacement:
   Armament: 739 tons, 6.2 %
      - Guns: 739 tons, 6.2 %
   Armour: 4,393 tons, 36.9 %
      - Belts: 2,551 tons, 21.4 %
      - Armament: 911 tons, 7.7 %
      - Armour Deck: 662 tons, 5.6 %
      - Conning Towers: 270 tons, 2.3 %
   Machinery: 1,709 tons, 14.3 %
   Hull, fittings & equipment: 3,607 tons, 30.3 %
   Fuel, ammunition & stores: 1,450 tons, 12.2 %
   Miscellaneous weights: 12 tons, 0.1 %
      - Hull below water: 12 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     17,269 lbs / 7,833 Kg = 20.0 x 12.0 " / 305 mm shells or 2.5 torpedoes
   Stability (Unstable if below 1.00): 1.33
   Metacentric height 4.8 ft / 1.5 m
   Roll period: 14.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 78 %
         - Recoil effect (Restricted arc if above 1.00): 0.45
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has a flush deck,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.538 / 0.543
   Length to Beam Ratio: 4.90 : 1
   'Natural speed' for length: 19.24 kts
   Power going to wave formation at top speed: 47 %
   Trim (Max stability = 0, Max steadiness = 100): 39
   Bow angle (Positive = bow angles forward): -10.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  20.00 ft / 6.10 m,  20.00 ft / 6.10 m
      - Forward deck:   30.00 %,  20.00 ft / 6.10 m,  20.00 ft / 6.10 m
      - Aft deck:   35.00 %,  20.00 ft / 6.10 m,  20.00 ft / 6.10 m
      - Quarter deck:   15.00 %,  20.00 ft / 6.10 m,  20.00 ft / 6.10 m
      - Average freeboard:      20.00 ft / 6.10 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 73.4 %
      - Above water (accommodation/working, high = better): 118.8 %
   Waterplane Area: 17,742 Square feet or 1,648 Square metres
   Displacement factor (Displacement / loading): 107 %
   Structure weight / hull surface area: 136 lbs/sq ft or 662 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.86
      - Longitudinal: 3.73
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Tumblehome hull.

Tumblehome BB1v3, Russia Battleship laid down 1895

Displacement:
   12,000 t light; 12,500 t standard; 13,578 t normal; 14,441 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (408.00 ft / 400.00 ft) x 70.00 ft (Bulges 76.00 ft) x (26.00 / 27.47 ft)
   (124.36 m / 121.92 m) x 21.34 m (Bulges 23.16 m)  x (7.92 / 8.37 m)

Armament:
      4 - 12.00" / 305 mm 40.0 cal guns - 749.99lbs / 340.19kg shells, 60 per gun
     Breech loading guns in turret on barbette mounts, 1895 Model
     2 x Twin mounts on centreline ends, evenly spread
      12 - 6.00" / 152 mm 45.0 cal guns - 80.01lbs / 36.29kg shells, 180 per gun
     Breech loading guns in casemate mounts, 1895 Model
     12 x Single mounts on sides, evenly spread
      8 - 3.00" / 76.2 mm 50.0 cal guns - 20.00lbs / 9.07kg shells, 360 per gun
     Breech loading guns in deck mounts, 1895 Model
     8 x Single mounts on centreline ends, evenly spread
      8 raised mounts
      Weight of broadside 4,120 lbs / 1,869 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   12.0" / 305 mm   276.00 ft / 84.12 m   12.00 ft / 3.66 m
   Ends:   6.00" / 152 mm   124.00 ft / 37.80 m   8.00 ft / 2.44 m
   Upper:   6.00" / 152 mm   240.00 ft / 73.15 m   8.00 ft / 2.44 m
     Main Belt covers 106 % of normal length
     Main Belt inclined -30.00 degrees (positive = in)

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   12.0" / 305 mm   6.00" / 152 mm      10.0" / 254 mm
   2nd:   3.00" / 76 mm         -               -

   - Armoured deck - single deck:
   For and Aft decks: 2.00" / 51 mm
   Forecastle: 2.00" / 51 mm  Quarter deck: 2.00" / 51 mm

   - Conning towers: Forward 10.00" / 254 mm, Aft 10.00" / 254 mm

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 20,495 ihp / 15,289 Kw = 20.00 kts
   Range 6,000nm at 10.00 kts
   Bunker at max displacement = 1,941 tons (100% coal)

Complement:
   628 - 817

Cost:
   £1.249 million / $4.997 million

Distribution of weights at normal displacement:
   Armament: 739 tons, 5.4 %
      - Guns: 739 tons, 5.4 %
   Armour: 4,146 tons, 30.5 %
      - Belts: 2,480 tons, 18.3 %
      - Armament: 656 tons, 4.8 %
      - Armour Deck: 765 tons, 5.6 %
      - Conning Towers: 245 tons, 1.8 %
   Machinery: 3,474 tons, 25.6 %
   Hull, fittings & equipment: 3,631 tons, 26.7 %
   Fuel, ammunition & stores: 1,578 tons, 11.6 %
   Miscellaneous weights: 10 tons, 0.1 %
      - Hull below water: 10 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     11,898 lbs / 5,397 Kg = 13.8 x 12.0 " / 305 mm shells or 1.7 torpedoes
   Stability (Unstable if below 1.00): 1.37
   Metacentric height 5.1 ft / 1.6 m
   Roll period: 14.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 75 %
         - Recoil effect (Restricted arc if above 1.00): 0.31
   Seaboat quality  (Average = 1.00): 1.31

Hull form characteristics:
   Hull has a flush deck,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.601 / 0.605
   Length to Beam Ratio: 5.26 : 1
   'Natural speed' for length: 20.00 kts
   Power going to wave formation at top speed: 54 %
   Trim (Max stability = 0, Max steadiness = 100): 57
   Bow angle (Positive = bow angles forward): -10.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  16.00 ft / 4.88 m,  16.00 ft / 4.88 m
      - Forward deck:   30.00 %,  16.00 ft / 4.88 m,  16.00 ft / 4.88 m
      - Aft deck:   35.00 %,  16.00 ft / 4.88 m,  16.00 ft / 4.88 m
      - Quarter deck:   15.00 %,  16.00 ft / 4.88 m,  16.00 ft / 4.88 m
      - Average freeboard:      16.00 ft / 4.88 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 106.1 %
      - Above water (accommodation/working, high = better): 99.5 %
   Waterplane Area: 20,503 Square feet or 1,905 Square metres
   Displacement factor (Displacement / loading): 94 %
   Structure weight / hull surface area: 128 lbs/sq ft or 626 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.91
      - Longitudinal: 2.20
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

Tumblehome hull.

[snip]

I still feel the belts are rather short verticaly on both designs, but then again I have 15' high belts so YMMV. My thougths on which of the two is "better" are this. Russia needs a "standard" battleline moreso then our other player *cough*Tan*cough* who is hybridising his Armored Cruisers and Battleships. I understand the rational behind wanting to get both classes on one hull, but IMO Russia cannot get away with this due to who her likely enemies are. What I would do, is take hull BB1v3, slow it down to 16-17 knts and use the freed up strength for armor protection. Then that gives you a ~12,000 ton BB that I would hesitate to send an Illustrious (a 13,100 ship) into a 1v1 cagematch with. Also, I think the shell weight on your 6" guns is a bit low. Are these historical guns?

[Tanthalas]

@snip period wise his belts are actualy about the right height perhaps even a bit tall for a conventional hull (this from the guy that likes 14' belt heights) I would have to do the math to see if they would cover 10' (which is about period norm) with that incline.

@ Delta I tend to agree with snip on your shell weights, the 6/40 both he and I are using throws a 100 pound shell so 80 feals a tad light.  I also question Russias (heck I question Italias need) for a 20 knot Battleship, realy I think he is right that you wold be better concentrating on a uniform battle line.

[snip]

@snip period wise his belts are actualy about the right height perhaps even a bit tall for a conventional hull (this from the guy that likes 14' belt heights) I would have to do the math to see if they would cover 10' (which is about period norm) with that incline.

I tend to overprotect my ships, and I freely admit that *looks to see if there is a clinic for that*  I feel that especially with the Tumblehome, that these ships should have higher belts.

[Delta Force]

It turns out that a 30 degree angle reduces vertical belt height by half, so I've doubled the height (it now covers 8 feet in vertical height). The shell weights are based on historical guns, Russian 6 inch guns had shells only around 80-85 pounds during the 1890s. What do you think about dropping speed by an additional knot in order to increase the area covered or increase the thickness of the armor?

Also, I'm considering taking a rather Mahanian approach to the Russian fleet and refraining from the construction of protected cruisers (something Russia almost didn't develop in real life), with the fleet consisting of battleships, armored cruisers, and small combatants (torpedo boat destroyers, minelayers, etc.).

Tumblehome BB1v3B, Russia Battleship laid down 1895

Displacement:
   11,710 t light; 12,210 t standard; 13,629 t normal; 14,764 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (408.00 ft / 400.00 ft) x 70.00 ft (Bulges 76.00 ft) x (26.00 / 27.93 ft)
   (124.36 m / 121.92 m) x 21.34 m (Bulges 23.16 m)  x (7.92 / 8.51 m)

Armament:
      4 - 12.00" / 305 mm 40.0 cal guns - 749.99lbs / 340.19kg shells, 60 per gun
     Breech loading guns in turret on barbette mounts, 1895 Model
     2 x Twin mounts on centreline ends, evenly spread
      12 - 6.00" / 152 mm 45.0 cal guns - 80.01lbs / 36.29kg shells, 180 per gun
     Breech loading guns in casemate mounts, 1895 Model
     12 x Single mounts on sides, evenly spread
      8 - 3.00" / 76.2 mm 50.0 cal guns - 20.00lbs / 9.07kg shells, 360 per gun
     Breech loading guns in deck mounts, 1895 Model
     8 x Single mounts on centreline ends, evenly spread
      8 raised mounts
      Weight of broadside 4,120 lbs / 1,869 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   14.0" / 356 mm   260.00 ft / 79.25 m   16.00 ft / 4.88 m
   Ends:   6.00" / 152 mm   140.00 ft / 42.67 m   16.00 ft / 4.88 m
   Upper:   6.00" / 152 mm   260.00 ft / 79.25 m   8.00 ft / 2.44 m
     Main Belt covers 100 % of normal length
     Main Belt inclined -30.00 degrees (positive = in)

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   14.0" / 356 mm   6.00" / 152 mm      12.0" / 305 mm
   2nd:   3.00" / 76 mm         -               -
   3rd:   1.00" / 25 mm         -               -

   - Armoured deck - single deck:
   For and Aft decks: 2.00" / 51 mm
   Forecastle: 2.00" / 51 mm  Quarter deck: 2.00" / 51 mm

   - Conning towers: Forward 12.00" / 305 mm, Aft 12.00" / 305 mm

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 10,888 ihp / 8,122 Kw = 17.00 kts
   Range 8,000nm at 10.00 kts
   Bunker at max displacement = 2,553 tons (100% coal)

Complement:
   629 - 819

Cost:
   £1.011 million / $4.045 million

Distribution of weights at normal displacement:
   Armament: 739 tons, 5.4 %
      - Guns: 739 tons, 5.4 %
   Armour: 5,467 tons, 40.1 %
      - Belts: 3,647 tons, 26.8 %
      - Armament: 758 tons, 5.6 %
      - Armour Deck: 766 tons, 5.6 %
      - Conning Towers: 295 tons, 2.2 %
   Machinery: 1,845 tons, 13.5 %
   Hull, fittings & equipment: 3,648 tons, 26.8 %
   Fuel, ammunition & stores: 1,919 tons, 14.1 %
   Miscellaneous weights: 10 tons, 0.1 %
      - Hull below water: 10 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     20,172 lbs / 9,150 Kg = 23.3 x 12.0 " / 305 mm shells or 2.8 torpedoes
   Stability (Unstable if below 1.00): 1.42
   Metacentric height 5.4 ft / 1.6 m
   Roll period: 13.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 75 %
         - Recoil effect (Restricted arc if above 1.00): 0.30
   Seaboat quality  (Average = 1.00): 1.78

Hull form characteristics:
   Hull has a flush deck,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.604 / 0.609
   Length to Beam Ratio: 5.26 : 1
   'Natural speed' for length: 20.00 kts
   Power going to wave formation at top speed: 45 %
   Trim (Max stability = 0, Max steadiness = 100): 42
   Bow angle (Positive = bow angles forward): -10.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  16.00 ft / 4.88 m,  16.00 ft / 4.88 m
      - Forward deck:   30.00 %,  16.00 ft / 4.88 m,  16.00 ft / 4.88 m
      - Aft deck:   35.00 %,  16.00 ft / 4.88 m,  16.00 ft / 4.88 m
      - Quarter deck:   15.00 %,  16.00 ft / 4.88 m,  16.00 ft / 4.88 m
      - Average freeboard:      16.00 ft / 4.88 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 67.6 %
      - Above water (accommodation/working, high = better): 99.5 %
   Waterplane Area: 20,546 Square feet or 1,909 Square metres
   Displacement factor (Displacement / loading): 110 %
   Structure weight / hull surface area: 128 lbs/sq ft or 627 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.91
      - Longitudinal: 2.16
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Tumblehome hull.

Miscellaneous weight:
10 tons hull below water is for 6 x 18 inch torpedo tubes (2 fore, 2 aft, 1 each broadside) with 3 x 1,250 pound torpedoes each.

[snip]

8 feet? O boy, that is short. I would say go to 16knts and make the belt taller, even slightly at the expense of its thickness

[Nobody]

It turns out that a 30 degree angle reduces vertical belt height by half...

No it does not. 60° would. With 30° your belt covers 13.4% [cos(30°)=0.866] less than a normal vertical one.

[Delta Force]

I've revised the design again. It looks that ton for ton tumblehome designs are more powerful ships, although of course they are more fragile once hit.

Tumblehome BB1v3C, Russia Battleship laid down 1895

Displacement:
   11,810 t light; 12,313 t standard; 13,739 t normal; 14,880 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (408.00 ft / 400.00 ft) x 70.00 ft (Bulges 76.00 ft) x (26.00 / 27.93 ft)
   (124.36 m / 121.92 m) x 21.34 m (Bulges 23.16 m)  x (7.92 / 8.51 m)

Armament:
      4 - 12.00" / 305 mm 40.0 cal guns - 749.99lbs / 340.19kg shells, 60 per gun
     Breech loading guns in turret on barbette mounts, 1895 Model
     2 x Twin mounts on centreline ends, evenly spread
      12 - 6.00" / 152 mm 45.0 cal guns - 80.01lbs / 36.29kg shells, 180 per gun
     Breech loading guns in casemate mounts, 1895 Model
     12 x Single mounts on sides, evenly spread
      8 - 3.00" / 76.2 mm 50.0 cal guns - 20.00lbs / 9.07kg shells, 360 per gun
     Breech loading guns in deck mounts, 1895 Model
     8 x Single mounts on centreline ends, evenly spread
      8 raised mounts
      Weight of broadside 4,120 lbs / 1,869 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   16.0" / 406 mm   260.00 ft / 79.25 m   13.86 ft / 4.22 m
   Ends:   6.00" / 152 mm   140.00 ft / 42.67 m   13.86 ft / 4.22 m
   Upper:   6.00" / 152 mm   260.00 ft / 79.25 m   8.00 ft / 2.44 m
     Main Belt covers 100 % of normal length
     Main Belt inclined -30.00 degrees (positive = in)

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   16.0" / 406 mm   6.00" / 152 mm      14.0" / 356 mm
   2nd:   3.00" / 76 mm         -               -
   3rd:   1.00" / 25 mm         -               -

   - Armoured deck - single deck:
   For and Aft decks: 2.00" / 51 mm
   Forecastle: 2.00" / 51 mm  Quarter deck: 2.00" / 51 mm

   - Conning towers: Forward 14.00" / 356 mm, Aft 14.00" / 356 mm

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 10,959 ihp / 8,175 Kw = 17.00 kts
   Range 8,000nm at 10.00 kts
   Bunker at max displacement = 2,567 tons (100% coal)

Complement:
   633 - 824

Cost:
   £1.016 million / $4.065 million

Distribution of weights at normal displacement:
   Armament: 739 tons, 5.4 %
      - Guns: 739 tons, 5.4 %
   Armour: 5,516 tons, 40.1 %
      - Belts: 3,557 tons, 25.9 %
      - Armament: 843 tons, 6.1 %
      - Armour Deck: 770 tons, 5.6 %
      - Conning Towers: 346 tons, 2.5 %
   Machinery: 1,857 tons, 13.5 %
   Hull, fittings & equipment: 3,688 tons, 26.8 %
   Fuel, ammunition & stores: 1,929 tons, 14.0 %
   Miscellaneous weights: 10 tons, 0.1 %
      - Hull below water: 10 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     20,252 lbs / 9,186 Kg = 23.4 x 12.0 " / 305 mm shells or 2.9 torpedoes
   Stability (Unstable if below 1.00): 1.40
   Metacentric height 5.3 ft / 1.6 m
   Roll period: 13.9 seconds
   Steadiness   - As gun platform (Average = 50 %): 75 %
         - Recoil effect (Restricted arc if above 1.00): 0.31
   Seaboat quality  (Average = 1.00): 1.78

Hull form characteristics:
   Hull has a flush deck,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.608 / 0.613
   Length to Beam Ratio: 5.26 : 1
   'Natural speed' for length: 20.00 kts
   Power going to wave formation at top speed: 46 %
   Trim (Max stability = 0, Max steadiness = 100): 42
   Bow angle (Positive = bow angles forward): -10.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  16.00 ft / 4.88 m,  16.00 ft / 4.88 m
      - Forward deck:   30.00 %,  16.00 ft / 4.88 m,  16.00 ft / 4.88 m
      - Aft deck:   35.00 %,  16.00 ft / 4.88 m,  16.00 ft / 4.88 m
      - Quarter deck:   15.00 %,  16.00 ft / 4.88 m,  16.00 ft / 4.88 m
      - Average freeboard:      16.00 ft / 4.88 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 67.3 %
      - Above water (accommodation/working, high = better): 99.4 %
   Waterplane Area: 20,640 Square feet or 1,918 Square metres
   Displacement factor (Displacement / loading): 110 %
   Structure weight / hull surface area: 129 lbs/sq ft or 631 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.91
      - Longitudinal: 2.18
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Tumblehome hull.

Belt and end armor belts cover 12 feet vertically.

Miscellaneous weight:
10 tons hull below water is for 6 x 18 inch torpedo tubes (2 fore, 2 aft, 1 each broadside) with 3 x 1,250 pound torpedoes each.

[snip]

I think a 16" belt is a tad overkill. Take it back to 14" and use the freed up strength to thicken the ends and upper?

[KWorld]

For 1895, 16" is actually fairly normal: USS Indiana carried an 18" belt, USS Iowa a 14" belt, the Kearsarge carried a 16.5" belt, etc.