Joseon (Korean) Navy

[Ithekro]

First attempt at a mixed iron vessel (central battery with turreted heavy secondaries).  The idea is that the secondaries can fire faster so should be able to fire in any direction while the slower primaries are used only when the enemy is close.  The 4.5" are massed fire...lots of metal in there air since combat will still be in roughly a mile or two distance or less.
I originally wanted 8 x 11" and 8 x 9" guns all on the broadside (4 of each on each side) with the 11" on the lower deck and the 9" on the upper deck in a Ship of the Line style, but the ship was not handling well.   So I lowered the number of guns and upped the size of the ship to roughly match a French ship from 1876.  Don't know if I will keep this style or not yet.

I want it over-built and over-armed (and prehaps over-armored).

Defender of the Dragon

Korea Battleship laid down 1875
Armoured Corvette (Broadside ironclad)

Displacement:
   8,264 t light; 8,666 t standard; 9,200 t normal; 9,590 t full load

Dimensions: Length overall / water x beam x draught
   310.00 ft / 310.00 ft x 62.00 ft x 24.00 ft (normal load)
   94.49 m / 94.49 m x 18.90 m  x 7.32 m

Armament:
      4 - 11.00" / 279 mm guns in single mounts, 515.84lbs / 233.98kg shells, 1875 Model
     Breech loading guns in broadside mounts
     on side, all amidships
      4 - 9.00" / 229 mm guns (2x2 guns), 282.53lbs / 128.15kg shells, 1875 Model
     Breech loading guns in Coles/Ericsson turrets
     on centreline ends, evenly spread
      14 - 4.50" / 114 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1875 Model
     Breech loading guns in casemate mounts
     on side, evenly spread, 4 raised mounts
      2 - 0.75" / 19.1 mm guns in single mounts, 0.16lbs / 0.07kg shells, 1875 Model
     Breech loading guns in deck mounts
     on centreline, evenly spread, all raised mounts
   Weight of broadside 3,688 lbs / 1,673 kg
   Shells per gun, main battery: 100

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   11.0" / 279 mm   200.00 ft / 60.96 m   8.00 ft / 2.44 m
   Ends:   5.00" / 127 mm   110.00 ft / 33.53 m   8.00 ft / 2.44 m
   Upper:   8.00" / 203 mm   200.00 ft / 60.96 m   8.00 ft / 2.44 m
     Main Belt covers 99 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   8.00" / 203 mm         -               -
   2nd:   11.0" / 279 mm   7.00" / 178 mm            -
   3rd:   3.00" / 76 mm         -               -
   4th:   1.00" / 25 mm         -               -

   - Armour deck: 2.00" / 51 mm, Conning tower: 11.00" / 279 mm

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 2 shafts, 5,193 ihp / 3,874 Kw = 14.00 kts
   Range 2,000nm at 10.00 kts (Bunkerage = 960 tons)

Complement:
   469 - 610

Cost:
   £0.839 million / $3.355 million

Distribution of weights at normal displacement:
   Armament: 461 tons, 5.0 %
   Armour: 3,150 tons, 34.2 %
      - Belts: 1,546 tons, 16.8 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 935 tons, 10.2 %
      - Armour Deck: 565 tons, 6.1 %
      - Conning Tower: 104 tons, 1.1 %
   Machinery: 1,158 tons, 12.6 %
   Hull, fittings & equipment: 3,346 tons, 36.4 %
   Fuel, ammunition & stores: 936 tons, 10.2 %
   Miscellaneous weights: 150 tons, 1.6 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     7,252 lbs / 3,289 Kg = 14.1 x 11.0 " / 279 mm shells or 1.3 torpedoes
   Stability (Unstable if below 1.00): 1.09
   Metacentric height 2.9 ft / 0.9 m
   Steadiness   - As gun platform (Average = 50 %): 79 %
         - Recoil effect (Restricted arc if above 1.00): 0.53
   Seaboat quality  (Average = 1.00): 1.59

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.698
   Length to Beam Ratio: 5.00 : 1
   'Natural speed' for length: 17.61 kts
   Power going to wave formation at top speed: 45 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   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:      16.00 ft / 4.88 m
      - Forecastle (20 %):   12.00 ft / 3.66 m
      - Mid (50 %):      12.00 ft / 3.66 m
      - Quarterdeck (15 %):   12.00 ft / 3.66 m
      - Stern:      12.00 ft / 3.66 m
      - Average freeboard:   12.32 ft / 3.76 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 80.7 %
      - Above water (accommodation/working, high = better): 74.4 %
   Waterplane Area: 15,271 Square feet or 1,419 Square metres
   Displacement factor (Displacement / loading): 99 %
   Structure weight / hull surface area: 153 lbs/sq ft or 747 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.99
      - Longitudinal: 2.62
      - Overall: 1.10
   Hull space for machinery, storage, compartmentation is excellent
   Room for accommodation and workspaces is cramped
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

[Tanthalas]

armor is IMHO fine, gunlayout is fine by me although I might swap the 9" and 11" locations, the only thing I would change is to switch the guns to muzzle loaders.

[Valles]

Given what Ithekro's said about Korean attitudes towards volume of fire, it'd make perfect sense for them to go for rate of fire over muzzle velocity, I think.

[Ithekro]

This is what I get if I swap them and do muzzle loaders (I had to alter the ship slightly to keep a 1.05 composite strength.)
She's not as overbuilt as I think it should be, but my preception might be off.

Defender of the Dragon, Korea Battleship laid down 1875
Central citadel ship
Armoured Corvette (Broadside ironclad)

Displacement:
   8,361 t light; 8,765 t standard; 9,300 t normal; 9,691 t full load

Dimensions: Length overall / water x beam x draught
   310.00 ft / 310.00 ft x 62.00 ft x 25.00 ft (normal load)
   94.49 m / 94.49 m x 18.90 m  x 7.62 m

Armament:
      4 - 11.00" / 279 mm guns (2x2 guns), 515.84lbs / 233.98kg shells, 1875 Model
     Muzzle loading guns in Coles/Ericsson turrets
     on side, all amidships
      4 - 9.00" / 229 mm guns in single mounts, 282.53lbs / 128.15kg shells, 1875 Model
     Muzzle loading guns in broadside mounts
     on side ends, evenly spread
      14 - 4.50" / 114 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1875 Model
     Muzzle loading guns in casemate mounts
     on side, evenly spread, 4 raised mounts
      2 - 0.75" / 19.1 mm guns in single mounts, 0.16lbs / 0.07kg shells, 1875 Model
     Breech loading guns in deck mounts
     on centreline, evenly spread, all raised mounts
   Weight of broadside 3,688 lbs / 1,673 kg
   Shells per gun, main battery: 100

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   11.0" / 279 mm   200.00 ft / 60.96 m   8.00 ft / 2.44 m
   Ends:   5.00" / 127 mm   110.00 ft / 33.53 m   8.00 ft / 2.44 m
   Upper:   8.00" / 203 mm   200.00 ft / 60.96 m   8.00 ft / 2.44 m
     Main Belt covers 99 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   11.0" / 279 mm   7.00" / 178 mm            -
   2nd:   8.00" / 203 mm         -               -
   3rd:   3.00" / 76 mm         -               -
   4th:   1.00" / 25 mm         -               -

   - Armour deck: 2.00" / 51 mm, Conning tower: 11.00" / 279 mm

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 2 shafts, 5,189 ihp / 3,871 Kw = 14.00 kts
   Range 2,000nm at 10.00 kts (Bunkerage = 963 tons)

Complement:
   473 - 615

Cost:
   £0.842 million / $3.368 million

Distribution of weights at normal displacement:
   Armament: 461 tons, 5.0 %
   Armour: 3,250 tons, 34.9 %
      - Belts: 1,544 tons, 16.6 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 1,048 tons, 11.3 %
      - Armour Deck: 553 tons, 5.9 %
      - Conning Tower: 105 tons, 1.1 %
   Machinery: 1,157 tons, 12.4 %
   Hull, fittings & equipment: 3,343 tons, 35.9 %
   Fuel, ammunition & stores: 939 tons, 10.1 %
   Miscellaneous weights: 150 tons, 1.6 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     7,265 lbs / 3,295 Kg = 14.1 x 11.0 " / 279 mm shells or 1.3 torpedoes
   Stability (Unstable if below 1.00): 1.08
   Metacentric height 2.8 ft / 0.9 m
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.52
   Seaboat quality  (Average = 1.00): 1.57

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.677
   Length to Beam Ratio: 5.00 : 1
   'Natural speed' for length: 17.61 kts
   Power going to wave formation at top speed: 45 %
   Trim (Max stability = 0, Max steadiness = 100): 45
   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:      16.00 ft / 4.88 m
      - Forecastle (20 %):   12.00 ft / 3.66 m
      - Mid (50 %):      12.00 ft / 3.66 m
      - Quarterdeck (15 %):   12.00 ft / 3.66 m
      - Stern:      12.00 ft / 3.66 m
      - Average freeboard:   12.32 ft / 3.76 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 79.8 %
      - Above water (accommodation/working, high = better): 72.2 %
   Waterplane Area: 14,946 Square feet or 1,389 Square metres
   Displacement factor (Displacement / loading): 99 %
   Structure weight / hull surface area: 154 lbs/sq ft or 750 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.94
      - Longitudinal: 2.70
      - Overall: 1.05
   Hull space for machinery, storage, compartmentation is excellent
   Room for accommodation and workspaces is cramped
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

[Tanthalas]

My bad mate, I didnt explain it right.  What I was trying to say was do it like this

4 - 9.00" / 229 mm guns (2x2 guns), 282.53lbs / 128.15kg shells, 1875 Model
     Breech loading guns in Coles/Ericsson turrets
     on centreline ends, evenly spread
4 - 11.00" / 279 mm guns in single mounts, 515.84lbs / 233.98kg shells, 1875 Model
     Muzzle loading guns in broadside mounts
     on side, all amidships

Just swap the gun posistions.
@ Valles oh I agree for the smaller guns, I just havnt found a period example of a 11" BL gun

[Ithekro]

Oh, so this than:

Defender of the Dragon

Korea Battleship laid down 1875
Armoured Corvette (Broadside ironclad)

Displacement:
   8,261 t light; 8,666 t standard; 9,200 t normal; 9,590 t full load

Dimensions: Length overall / water x beam x draught
   310.00 ft / 310.00 ft x 62.00 ft x 24.00 ft (normal load)
   94.49 m / 94.49 m x 18.90 m  x 7.32 m

Armament:
      4 - 9.00" / 229 mm guns (2x2 guns), 282.53lbs / 128.15kg shells, 1875 Model
     Breech loading guns in Coles/Ericsson turrets
     on centreline ends, evenly spread
      4 - 11.00" / 279 mm guns in single mounts, 515.84lbs / 233.98kg shells, 1875 Model
     Muzzle loading guns in broadside mounts
     on side, all amidships
      14 - 4.50" / 114 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1875 Model
     Breech loading guns in casemate mounts
     on side, evenly spread, 4 raised mounts
      2 - 0.75" / 19.1 mm guns in single mounts, 0.16lbs / 0.07kg shells, 1875 Model
     Breech loading guns in deck mounts
     on centreline, evenly spread, all raised mounts
   Weight of broadside 3,688 lbs / 1,673 kg
   Shells per gun, main battery: 100

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   11.0" / 279 mm   200.00 ft / 60.96 m   8.00 ft / 2.44 m
   Ends:   5.00" / 127 mm   110.00 ft / 33.53 m   8.00 ft / 2.44 m
   Upper:   8.00" / 203 mm   200.00 ft / 60.96 m   8.00 ft / 2.44 m
     Main Belt covers 99 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   11.0" / 279 mm   7.00" / 178 mm            -
   2nd:   7.00" / 178 mm         -               -
   3rd:   3.00" / 76 mm         -               -
   4th:   1.00" / 25 mm         -               -

   - Armour deck: 2.00" / 51 mm, Conning tower: 11.00" / 279 mm

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 2 shafts, 5,193 ihp / 3,874 Kw = 14.00 kts
   Range 2,000nm at 10.00 kts (Bunkerage = 960 tons)

Complement:
   469 - 610

Cost:
   £0.839 million / $3.354 million

Distribution of weights at normal displacement:
   Armament: 461 tons, 5.0 %
   Armour: 3,121 tons, 33.9 %
      - Belts: 1,547 tons, 16.8 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 906 tons, 9.8 %
      - Armour Deck: 565 tons, 6.1 %
      - Conning Tower: 104 tons, 1.1 %
   Machinery: 1,158 tons, 12.6 %
   Hull, fittings & equipment: 3,371 tons, 36.6 %
   Fuel, ammunition & stores: 939 tons, 10.2 %
   Miscellaneous weights: 150 tons, 1.6 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     7,238 lbs / 3,283 Kg = 25.6 x 9.0 " / 229 mm shells or 1.3 torpedoes
   Stability (Unstable if below 1.00): 1.09
   Metacentric height 2.9 ft / 0.9 m
   Steadiness   - As gun platform (Average = 50 %): 79 %
         - Recoil effect (Restricted arc if above 1.00): 0.54
   Seaboat quality  (Average = 1.00): 1.58

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.698
   Length to Beam Ratio: 5.00 : 1
   'Natural speed' for length: 17.61 kts
   Power going to wave formation at top speed: 45 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   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:      16.00 ft / 4.88 m
      - Forecastle (20 %):   12.00 ft / 3.66 m
      - Mid (50 %):      12.00 ft / 3.66 m
      - Quarterdeck (15 %):   12.00 ft / 3.66 m
      - Stern:      12.00 ft / 3.66 m
      - Average freeboard:   12.32 ft / 3.76 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 80.7 %
      - Above water (accommodation/working, high = better): 74.4 %
   Waterplane Area: 15,271 Square feet or 1,419 Square metres
   Displacement factor (Displacement / loading): 99 %
   Structure weight / hull surface area: 154 lbs/sq ft or 753 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 1.00
      - Longitudinal: 2.64
      - Overall: 1.10
   Hull space for machinery, storage, compartmentation is excellent
   Room for accommodation and workspaces is cramped
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

[Tanthalas]

perfect from my viewpoint.

[Ithekro]

Tenative Turtle Ship of 1870s vintage.

Basically a mix of a broadside ironclad and a monitor.  The 7" rifles are on the ends with the forward and aft most guns able to pivot to a fore or aft gunport (two forward firing and two aft firing with two that will only be broadside firing on each side).
The Turret is raised over the armored deckhouse (which I will need to figure out how to represent the armor on since I doubt it is the upper belt and 2 inches of iron I was going for was the gunport shutters).  The turret is likely 11" smoothboore at this time unles someone has a 11" rifle.

Again the idea is volume of fire.  The 7" rifles will do a bunch while the 11" lines up a target.  She will be rather topheavy...and for some reason I was thinking sailes like an old Turtle Ship, but that might be foolish since this ship is not going to be a sea going warship and should have a flat bottom so she can rest in the mud.

Turtle Ship, Korea monitor laid down 1870
Central citadel ship
Armoured Corvette (Broadside ironclad)

Displacement:
   2,746 t light; 2,919 t standard; 3,000 t normal; 3,053 t full load

Dimensions: Length overall / water x beam x draught
   200.00 ft / 200.00 ft x 42.00 ft x 18.00 ft (normal load)
   60.96 m / 60.96 m x 12.80 m  x 5.49 m

Armament:
      2 - 11.00" / 279 mm guns (1x2 guns), 465.95lbs / 211.35kg shells, 1870 Model
     Muzzle loading guns in Coles/Ericsson turret
     on centreline amidships, all raised guns
      8 - 7.00" / 178 mm guns in single mounts, 120.08lbs / 54.47kg shells, 1870 Model
     Muzzle loading guns in broadside mounts
     on side, evenly spread
   Weight of broadside 1,893 lbs / 858 kg
   Shells per gun, main battery: 100

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   7.00" / 178 mm   150.00 ft / 45.72 m   10.00 ft / 3.05 m
   Ends:   4.00" / 102 mm     50.00 ft / 15.24 m   10.00 ft / 3.05 m
     Main Belt covers 115 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   7.00" / 178 mm   5.00" / 127 mm            -
   2nd:   2.00" / 51 mm         -               -

   - Armour deck: 3.00" / 76 mm, Conning tower: 7.00" / 178 mm

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 1 shaft, 865 ihp / 645 Kw = 10.00 kts
   Range 1,000nm at 7.00 kts (Bunkerage = 145 tons)

Complement:
   202 - 263

Cost:
   £0.323 million / $1.291 million

Distribution of weights at normal displacement:
   Armament: 237 tons, 7.9 %
   Armour: 1,105 tons, 36.8 %
      - Belts: 534 tons, 17.8 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 168 tons, 5.6 %
      - Armour Deck: 372 tons, 12.4 %
      - Conning Tower: 31 tons, 1.0 %
   Machinery: 200 tons, 6.7 %
   Hull, fittings & equipment: 1,155 tons, 38.5 %
   Fuel, ammunition & stores: 254 tons, 8.5 %
   Miscellaneous weights: 50 tons, 1.7 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,547 lbs / 702 Kg = 3.3 x 11.0 " / 279 mm shells or 0.6 torpedoes
   Stability (Unstable if below 1.00): 1.05
   Metacentric height 1.5 ft / 0.5 m
   Steadiness   - As gun platform (Average = 50 %): 26 %
         - Recoil effect (Restricted arc if above 1.00): 0.27
   Seaboat quality  (Average = 1.00): 0.28

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.694
   Length to Beam Ratio: 4.76 : 1
   'Natural speed' for length: 14.14 kts
   Power going to wave formation at top speed: 39 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   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:      3.00 ft / 0.91 m
      - Forecastle (20 %):   3.00 ft / 0.91 m
      - Mid (50 %):      3.00 ft / 0.91 m
      - Quarterdeck (15 %):   3.00 ft / 0.91 m
      - Stern:      3.00 ft / 0.91 m
      - Average freeboard:   3.00 ft / 0.91 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 82.9 %
      - Above water (accommodation/working, high = better): 19.0 %
   Waterplane Area: 6,699 Square feet or 622 Square metres
   Displacement factor (Displacement / loading): 86 %
   Structure weight / hull surface area: 130 lbs/sq ft or 636 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.98
      - Longitudinal: 2.02
      - Overall: 1.05
   Hull space for machinery, storage, compartmentation is excellent
   Room for accommodation and workspaces is extremely poor
   Ship has quick, lively roll, not a steady gun platform
   Caution: Lacks seaworthiness - very limited seakeeping ability

[Carthaginian]

Breech loaders are fine- that's what Richelieu (and my Richelieu clone) used.
The French layout is pretty unique at this time period- I like.
Only concern is that you should make real sure that you have enough armor to reach right up to the turret base- lest you have a hole between your citadel and your turret floor!

[Ithekro]

Technology is the question.  I can't find reliable breach loaders before 1877 for about any naval gun.  (There are some Armstrong and Krupp guns I think but I get no data on them being used in naval vessels).  Most countries BL are 1883 or later it seems with a few from 1877 onwards.

But that would be up to the technology tree I guess.

I suppose that means everything over a certain size needs to be a muzzle loader.  I think the largest I found being used before 1877 is a 7" BL...though I could just be missing something from limited source material.

[Ithekro]

A potential ship.   I'm trying to increase the ships firepower by adding more heavy guns and turrets, but I could only pull off one or the other it seems without serious recoil problems (and other issues).

Admiral Yi

Korea Panokeon laid down 1880

Displacement:
   9,766 t light; 10,294 t standard; 10,800 t normal; 11,205 t full load

Dimensions: Length overall / water x beam x draught
   330.00 ft / 330.00 ft x 62.00 ft x 24.00 ft (normal load)
   100.58 m / 100.58 m x 18.90 m  x 7.32 m

Armament:
      4 - 9.00" / 229 mm guns (2x2 guns), 309.83lbs / 140.53kg shells, 1880 Model
     Breech loading guns in turrets (on barbettes)
     on centreline ends, evenly spread
      6 - 11.00" / 279 mm guns in single mounts, 565.68lbs / 256.59kg shells, 1880 Model
     Muzzle loading guns in casemate mounts
     on side, all amidships
     4 guns in hull casemates - Limited use in heavy seas
      14 - 4.50" / 114 mm guns in single mounts, 38.73lbs / 17.57kg shells, 1880 Model
     Breech loading guns in casemate mounts
     on side, evenly spread, 4 raised mounts
      2 - 0.75" / 19.1 mm guns in single mounts, 0.18lbs / 0.08kg shells, 1880 Model
     Breech loading guns in deck mounts
     on side, evenly spread, all raised mounts
   Weight of broadside 5,176 lbs / 2,348 kg
   Shells per gun, main battery: 100

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   11.0" / 279 mm   210.00 ft / 64.01 m   8.00 ft / 2.44 m
   Ends:   5.00" / 127 mm   120.00 ft / 36.58 m   8.00 ft / 2.44 m
   Upper:   8.00" / 203 mm   210.00 ft / 64.01 m   8.00 ft / 2.44 m
     Main Belt covers 98 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   11.0" / 279 mm   7.00" / 178 mm      9.00" / 229 mm
   2nd:   9.00" / 229 mm         -               -
   3rd:   3.00" / 76 mm         -               -
   4th:   1.00" / 25 mm         -               -

   - Armour deck: 2.00" / 51 mm, Conning tower: 11.00" / 279 mm

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 2 shafts, 5,466 ihp / 4,078 Kw = 14.00 kts
   Range 2,000nm at 10.00 kts
   Bunker at max displacement = 911 tons (100% coal)

Complement:
   529 - 688

Cost:
   £1.043 million / $4.174 million

Distribution of weights at normal displacement:
   Armament: 647 tons, 6.0 %
   Armour: 3,436 tons, 31.8 %
      - Belts: 1,631 tons, 15.1 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 1,044 tons, 9.7 %
      - Armour Deck: 645 tons, 6.0 %
      - Conning Tower: 116 tons, 1.1 %
   Machinery: 1,129 tons, 10.5 %
   Hull, fittings & equipment: 4,404 tons, 40.8 %
   Fuel, ammunition & stores: 1,034 tons, 9.6 %
   Miscellaneous weights: 150 tons, 1.4 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     12,386 lbs / 5,618 Kg = 40.0 x 9.0 " / 229 mm shells or 1.6 torpedoes
   Stability (Unstable if below 1.00): 1.17
   Metacentric height 3.3 ft / 1.0 m
   Roll period: 14.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.89
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.770
   Length to Beam Ratio: 5.32 : 1
   'Natural speed' for length: 18.17 kts
   Power going to wave formation at top speed: 44 %
   Trim (Max stability = 0, Max steadiness = 100): 35
   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:      26.00 ft / 7.92 m
      - Forecastle (20 %):   22.00 ft / 6.71 m
      - Mid (50 %):      22.00 ft / 6.71 m
      - Quarterdeck (15 %):   22.00 ft / 6.71 m
      - Stern:      22.00 ft / 6.71 m
      - Average freeboard:   22.32 ft / 6.80 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 80.8 %
      - Above water (accommodation/working, high = better): 138.1 %
   Waterplane Area: 17,430 Square feet or 1,619 Square metres
   Displacement factor (Displacement / loading): 98 %
   Structure weight / hull surface area: 158 lbs/sq ft or 770 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 1.00
      - Longitudinal: 5.20
      - Overall: 1.18
   Hull space for machinery, storage, compartmentation is excellent
   Room for accommodation and workspaces is excellent
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

[Carthaginian]

http://www.cityofart.net/bship/frameset6.html

This ship in 1876 had reliable breech-loading guns of the same calibers you're trying to use. :D

[Nobody]

Technology is the question.  I can't find reliable breach loaders before 1877 for about any naval gun.  (There are some Armstrong and Krupp guns I think but I get no data on them being used in naval vessels).  Most countries BL are 1883 or later it seems with a few from 1877 onwards.

But that would be up to the technology tree I guess.

I suppose that means everything over a certain size needs to be a muzzle loader.  I think the largest I found being used before 1877 is a 7" BL...though I could just be missing something from limited source material.

Well Britain used the Armstrong RBL quite extensively starting in the 1850, for example on http://en.wikipedia.org/wiki/HMS_Warrior_(1860). They switched back to muzzle loaders looking for higher penetration between 1865(?) and 1880.
It appears that all Krupp guns of the area(1864 - 1880s) had horizontal sliding breech blocks, the largest such gun I could find with a quick search, has a caliber of 26 cm and can be found on SMS Preußen (laid down 1870).

[Ithekro]

Still pondering things.  Things like what diameter guns should be "standard" for Korea.  Should have have turrets early?  Should they have mixed turrets and armored box style ironclads?  Should I keep the rather odd broadside muzzle loaders mixed with turreted breachloader secondaries?...at least until the larger breachloaders are made.  Should I continue the idea of massed firepower, both on large hulls, and on smaller hulls?  Or go wit smaller heavily armored hulls that have fewer heavy guns but are built in large numbers (not torpedo boat numbers, but more than a dozen) so they can out number heavy battleships rather than try to match with simmilar size ships?   At least at this point in time.

In 1880, there are no real torpedo boats that I can recall.  There are torpedo cruisers, but to launch a tordope you have to be pretty much stopped and lower a rack with the torpedo into the water to release it (no tubes yet).  They also have poor range.   Battles are still fought by mass of guns at close range because the torpedo is not yet all that dangerous (not considered the super weapon and the torpedo boats the devil).  Once the torpedo boats start coming in and the ranges of battles increase as torpedo tubes start being fitted to everything, designs will start going to maximum size and great range...so that to new quick fires will eliminate the torpedo boats before they can get into range.

Or at least that is what I remember anyway.

[Guinness]

Torpedo Boats have come along by now. Whitehead has been doing his thing for more than a decade. I don't think compressed air tubs are common, but HMS Lightning had a pair of drop collars in 1876 which it's wikipedia article says were replaced by a single bow tube in 1879.