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I've been daydreaming on German history and decided to try my hand at Springsharping one of the early vessels of the Prussian Navy. In doing so, I realize that it is not what Springsharp is designed to do, but can do in theory. So I have had to make some assumptions, and I would invite your comments on whether they make sense or not.

I know that her tonnage is far from reality - the Arcona is quoted as having a tonnage of 1,930 - which if treated as normal tonnage gives an impossibly sharp BC of something like 0.318 - for all I know that could be correct, but I decided to go with a conservative BC of 0.500.

I had to guestimate armament for her - her pictures show about a dozen ports a side, but the details of her early armament are sketchy. I approximated the British 64pound RML gun and fitted her with two dozen, twelve on each broadside. I am not certain I did it in the best manner.

To account for the masts and rigging I allocated a lot of miscellaneous tonnage - if no account of this top-hamper is taken I fear her stability and seaworthiness would be grossly overstated.

To my eye the Springsharp does not look impossible. Any thoughts?

----------------

Arcona, Prussian Decked Corvette laid down 1858

Displacement: 2,575 t light; 2,763 t standard; 2,975 t normal; 3,145 t full load

Dimensions: Length overall / water x beam x draught

244.95 ft / 236.22 ft x 42.65 ft x 20.67 ft (normal load) [74.66 m / 72.00 m x 13.00 m x 6.30 m]

Armament:

24 - 6.30" / 160 mm guns in single mounts, 64.00lbs / 29.03kg shells, 1858 Model Muzzle loading guns in deck mounts on side, all amidships

Weight of broadside 1,536 lbs / 697 kg

Shells per gun, main battery: 150

Machinery:

Coal fired boilers, simple reciprocating steam engines, Direct drive, 1 shaft, 1,712 ihp / 1,277 Kw = 12.00 kts

Range 1,200nm at 8.00 kts

Bunker at max displacement = 382 tons (100% coal)

Complement: 200 - 261

Cost: £0.336 million / $1.345 million

Distribution of weights at normal displacement:

Armament: 195 tons, 6.6 %

Machinery: 588 tons, 19.8 %

Hull, fittings & equipment: 1,542 tons, 51.8 %

Fuel, ammunition & stores: 400 tons, 13.4 %

Miscellaneous weights: 250 tons, 8.4 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 1,111 lbs / 504 Kg = 17.1 x 6.3 " / 160 mm shells or 0.3 torpedoes

Stability (Unstable if below 1.00): 1.15

Metacentric height 1.8 ft / 0.6 m

Roll period: 13.3 seconds

Steadiness - As gun platform (Average = 50 %): 78 %

- Recoil effect (Restricted arc if above 1.00): 0.78

Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:

Hull has a flush deck

Block coefficient: 0.500

Length to Beam Ratio: 5.54 : 1

'Natural speed' for length: 15.37 kts

Power going to wave formation at top speed: 37 %

Trim (Max stability = 0, Max steadiness = 100): 39

Bow angle (Positive = bow angles forward): 15.00 degrees

Stern overhang: 3.28 ft / 1.00 m

Freeboard (% = measuring location as a percentage of overall length):

- Stem: 20.34 ft / 6.20 m

- Forecastle (20 %): 18.37 ft / 5.60 m

- Mid (50 %): 16.40 ft / 5.00 m

- Quarterdeck (15 %): 16.40 ft / 5.00 m

- Stern: 16.40 ft / 5.00 m

- Average freeboard: 17.25 ft / 5.26 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 123.4 %

- Above water (accommodation/working, high = better): 103.6 %

Waterplane Area: 6,453 Square feet or 599 Square metres

Displacement factor (Displacement / loading): 100 %

Structure weight / hull surface area: 116 lbs/sq ft or 568 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 0.80

- Longitudinal: 7.44

- Overall: 1.00

Hull space for machinery, storage, compartmentation is cramped

Room for accommodation and workspaces is adequate

Ship has slow, easy roll, a good, steady gun platform

Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Breakdown of Miscellaneous Weight

Allowance for full sail rig and rigging - 200 tons

Accommodation for Marine contingent - 50 tons

Fitted with lifting screw for cruising under sail

I know that her tonnage is far from reality - the Arcona is quoted as having a tonnage of 1,930 - which if treated as normal tonnage gives an impossibly sharp BC of something like 0.318 - for all I know that could be correct, but I decided to go with a conservative BC of 0.500.

I had to guestimate armament for her - her pictures show about a dozen ports a side, but the details of her early armament are sketchy. I approximated the British 64pound RML gun and fitted her with two dozen, twelve on each broadside. I am not certain I did it in the best manner.

To account for the masts and rigging I allocated a lot of miscellaneous tonnage - if no account of this top-hamper is taken I fear her stability and seaworthiness would be grossly overstated.

To my eye the Springsharp does not look impossible. Any thoughts?

----------------

Arcona, Prussian Decked Corvette laid down 1858

Displacement: 2,575 t light; 2,763 t standard; 2,975 t normal; 3,145 t full load

Dimensions: Length overall / water x beam x draught

244.95 ft / 236.22 ft x 42.65 ft x 20.67 ft (normal load) [74.66 m / 72.00 m x 13.00 m x 6.30 m]

Armament:

24 - 6.30" / 160 mm guns in single mounts, 64.00lbs / 29.03kg shells, 1858 Model Muzzle loading guns in deck mounts on side, all amidships

Weight of broadside 1,536 lbs / 697 kg

Shells per gun, main battery: 150

Machinery:

Coal fired boilers, simple reciprocating steam engines, Direct drive, 1 shaft, 1,712 ihp / 1,277 Kw = 12.00 kts

Range 1,200nm at 8.00 kts

Bunker at max displacement = 382 tons (100% coal)

Complement: 200 - 261

Cost: £0.336 million / $1.345 million

Distribution of weights at normal displacement:

Armament: 195 tons, 6.6 %

Machinery: 588 tons, 19.8 %

Hull, fittings & equipment: 1,542 tons, 51.8 %

Fuel, ammunition & stores: 400 tons, 13.4 %

Miscellaneous weights: 250 tons, 8.4 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 1,111 lbs / 504 Kg = 17.1 x 6.3 " / 160 mm shells or 0.3 torpedoes

Stability (Unstable if below 1.00): 1.15

Metacentric height 1.8 ft / 0.6 m

Roll period: 13.3 seconds

Steadiness - As gun platform (Average = 50 %): 78 %

- Recoil effect (Restricted arc if above 1.00): 0.78

Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:

Hull has a flush deck

Block coefficient: 0.500

Length to Beam Ratio: 5.54 : 1

'Natural speed' for length: 15.37 kts

Power going to wave formation at top speed: 37 %

Trim (Max stability = 0, Max steadiness = 100): 39

Bow angle (Positive = bow angles forward): 15.00 degrees

Stern overhang: 3.28 ft / 1.00 m

Freeboard (% = measuring location as a percentage of overall length):

- Stem: 20.34 ft / 6.20 m

- Forecastle (20 %): 18.37 ft / 5.60 m

- Mid (50 %): 16.40 ft / 5.00 m

- Quarterdeck (15 %): 16.40 ft / 5.00 m

- Stern: 16.40 ft / 5.00 m

- Average freeboard: 17.25 ft / 5.26 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 123.4 %

- Above water (accommodation/working, high = better): 103.6 %

Waterplane Area: 6,453 Square feet or 599 Square metres

Displacement factor (Displacement / loading): 100 %

Structure weight / hull surface area: 116 lbs/sq ft or 568 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 0.80

- Longitudinal: 7.44

- Overall: 1.00

Hull space for machinery, storage, compartmentation is cramped

Room for accommodation and workspaces is adequate

Ship has slow, easy roll, a good, steady gun platform

Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Breakdown of Miscellaneous Weight

Allowance for full sail rig and rigging - 200 tons

Accommodation for Marine contingent - 50 tons

Fitted with lifting screw for cruising under sail

In the same vein, I thought I might try my hand at an armored vessel, and chose as a model the famous Laird Rams - originally ordered by the Confederacy but taken into

the Royal Navy as HMS Scorpion and HMS Wyvern. The design information in Conways is a bit sketchy, but this is how it turned out. Thoughts?

------------

TBD, German Masted Turret Ship laid down 1862

Central citadel ship

Displacement: 2,315 t light; 2,454 t standard; 2,754 t normal; 2,994 t full load

Dimensions: Length overall / water x beam x draught

219.24 ft / 217.95 ft x 42.32 ft x 16.24 ft (normal load) [66.82 m / 66.43 m x 12.90 m x 4.95 m]

Armament:

4 - 9.06" / 230 mm guns (2x2 guns), 251.33lbs / 114.00kg shells, 1862 Model Muzzle loading guns in Coles/Ericsson turrets on centreline, all amidships

Weight of broadside 1,005 lbs / 456 kg

Shells per gun, main battery: 150

Armour:

Belts: Width (max) Length (avg) Height (avg)

Main: 4.33" / 110 mm 108.27 ft / 33.00 m 8.20 ft / 2.50 m

Ends: 1.97" / 50 mm 109.68 ft / 33.43 m 8.20 ft / 2.50 m

Main Belt covers 76 % of normal length

Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)

Main: 9.84" / 250 mm 5.12" / 130 mm -

Machinery:

Coal fired boilers, simple reciprocating steam engines, Direct drive, 1 shaft, 1,019 ihp / 760 Kw = 10.50 kts

Range 2,300nm at 8.00 kts

Bunker at max displacement = 541 tons (100% coal)

Complement: 189 - 247

Cost: £0.214 million / $0.857 million

Distribution of weights at normal displacement:

Armament: 108 tons, 3.9 %

Armour: 532 tons, 19.3 %

- Belts: 253 tons, 9.2 %

- Torpedo bulkhead: 0 tons, 0.0 %

- Armament: 279 tons, 10.1 %

- Armour Deck: 0 tons, 0.0 %

- Conning Tower: 0 tons, 0.0 %

Machinery: 306 tons, 11.1 %

Hull, fittings & equipment: 1,269 tons, 46.1 %

Fuel, ammunition & stores: 439 tons, 15.9 %

Miscellaneous weights: 100 tons, 3.6 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 1,843 lbs / 836 Kg = 8.6 x 9.1 " / 230 mm shells or 0.6 torpedoes

Stability (Unstable if below 1.00): 1.10

Metacentric height 1.7 ft / 0.5 m

Roll period: 13.8 seconds

Steadiness - As gun platform (Average = 50 %): 66 %

- Recoil effect (Restricted arc if above 1.00): 0.48

Seaboat quality (Average = 1.00): 1.61

Hull form characteristics:

Hull has raised quarterdeck

Block coefficient: 0.643

Length to Beam Ratio: 5.15 : 1

'Natural speed' for length: 14.76 kts

Power going to wave formation at top speed: 37 %

Trim (Max stability = 0, Max steadiness = 100): 41

Bow angle (Positive = bow angles forward): 5.00 degrees

Stern overhang: 0.00 ft / 0.00 m

Freeboard (% = measuring location as a percentage of overall length):

- Stem: 14.76 ft / 4.50 m

- Forecastle (20 %): 12.30 ft / 3.75 m

- Mid (50 %): 6.56 ft / 2.00 m

- Quarterdeck (15 %): 13.12 ft / 4.00 m (6.56 ft / 2.00 m before break)

- Stern: 13.12 ft / 4.00 m

- Average freeboard: 9.75 ft / 2.97 m

Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 71.3 %

- Above water (accommodation/working, high = better): 55.0 %

Waterplane Area: 6,918 Square feet or 643 Square metres

Displacement factor (Displacement / loading): 131 %

Structure weight / hull surface area: 123 lbs/sq ft or 600 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 0.89

- Longitudinal: 2.80

- Overall: 1.00

Hull space for machinery, storage, compartmentation is excellent

Room for accommodation and workspaces is cramped

Excellent seaboat, comfortable, can fire her guns in the heaviest weather

100 tons Miscellaneous Weight used to simulate light masts and rigging

the Royal Navy as HMS Scorpion and HMS Wyvern. The design information in Conways is a bit sketchy, but this is how it turned out. Thoughts?

------------

TBD, German Masted Turret Ship laid down 1862

Central citadel ship

Displacement: 2,315 t light; 2,454 t standard; 2,754 t normal; 2,994 t full load

Dimensions: Length overall / water x beam x draught

219.24 ft / 217.95 ft x 42.32 ft x 16.24 ft (normal load) [66.82 m / 66.43 m x 12.90 m x 4.95 m]

Armament:

4 - 9.06" / 230 mm guns (2x2 guns), 251.33lbs / 114.00kg shells, 1862 Model Muzzle loading guns in Coles/Ericsson turrets on centreline, all amidships

Weight of broadside 1,005 lbs / 456 kg

Shells per gun, main battery: 150

Armour:

Belts: Width (max) Length (avg) Height (avg)

Main: 4.33" / 110 mm 108.27 ft / 33.00 m 8.20 ft / 2.50 m

Ends: 1.97" / 50 mm 109.68 ft / 33.43 m 8.20 ft / 2.50 m

Main Belt covers 76 % of normal length

Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)

Main: 9.84" / 250 mm 5.12" / 130 mm -

Machinery:

Coal fired boilers, simple reciprocating steam engines, Direct drive, 1 shaft, 1,019 ihp / 760 Kw = 10.50 kts

Range 2,300nm at 8.00 kts

Bunker at max displacement = 541 tons (100% coal)

Complement: 189 - 247

Cost: £0.214 million / $0.857 million

Distribution of weights at normal displacement:

Armament: 108 tons, 3.9 %

Armour: 532 tons, 19.3 %

- Belts: 253 tons, 9.2 %

- Torpedo bulkhead: 0 tons, 0.0 %

- Armament: 279 tons, 10.1 %

- Armour Deck: 0 tons, 0.0 %

- Conning Tower: 0 tons, 0.0 %

Machinery: 306 tons, 11.1 %

Hull, fittings & equipment: 1,269 tons, 46.1 %

Fuel, ammunition & stores: 439 tons, 15.9 %

Miscellaneous weights: 100 tons, 3.6 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 1,843 lbs / 836 Kg = 8.6 x 9.1 " / 230 mm shells or 0.6 torpedoes

Stability (Unstable if below 1.00): 1.10

Metacentric height 1.7 ft / 0.5 m

Roll period: 13.8 seconds

Steadiness - As gun platform (Average = 50 %): 66 %

- Recoil effect (Restricted arc if above 1.00): 0.48

Seaboat quality (Average = 1.00): 1.61

Hull form characteristics:

Hull has raised quarterdeck

Block coefficient: 0.643

Length to Beam Ratio: 5.15 : 1

'Natural speed' for length: 14.76 kts

Power going to wave formation at top speed: 37 %

Trim (Max stability = 0, Max steadiness = 100): 41

Bow angle (Positive = bow angles forward): 5.00 degrees

Stern overhang: 0.00 ft / 0.00 m

Freeboard (% = measuring location as a percentage of overall length):

- Stem: 14.76 ft / 4.50 m

- Forecastle (20 %): 12.30 ft / 3.75 m

- Mid (50 %): 6.56 ft / 2.00 m

- Quarterdeck (15 %): 13.12 ft / 4.00 m (6.56 ft / 2.00 m before break)

- Stern: 13.12 ft / 4.00 m

- Average freeboard: 9.75 ft / 2.97 m

Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 71.3 %

- Above water (accommodation/working, high = better): 55.0 %

Waterplane Area: 6,918 Square feet or 643 Square metres

Displacement factor (Displacement / loading): 131 %

Structure weight / hull surface area: 123 lbs/sq ft or 600 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 0.89

- Longitudinal: 2.80

- Overall: 1.00

Hull space for machinery, storage, compartmentation is excellent

Room for accommodation and workspaces is cramped

Excellent seaboat, comfortable, can fire her guns in the heaviest weather

100 tons Miscellaneous Weight used to simulate light masts and rigging

The German wiki gives the length of the SMS Arcona as 65.55m at the waterline and 71.95m overall. Also the maximum draft is given as 6.35m (which would be at full load and not normal load). Because you used those maximum values, it does not surprise me that you end up with a weird BC when sticking to that particular displacement.

The displacement is given as 1928 tonnes but it is the construction ("Konstruktion") displacement. I would not know how similar that would be to normal displacement which is the baseline for springsharp.

It is also indicated that with the ~220 tonnes of coal, it has a range of 1150 nm at 11 knots.

Looking at the photo, I would say that the freeboard would be fairly flat over the entire length.

The guns appear to be below deck, not above.

http://de.wikipedia.org/wiki/SMS_Arcona_%281858%29

Will take a look at the other vessel in a moment...

The displacement is given as 1928 tonnes but it is the construction ("Konstruktion") displacement. I would not know how similar that would be to normal displacement which is the baseline for springsharp.

It is also indicated that with the ~220 tonnes of coal, it has a range of 1150 nm at 11 knots.

Looking at the photo, I would say that the freeboard would be fairly flat over the entire length.

The guns appear to be below deck, not above.

http://de.wikipedia.org/wiki/SMS_Arcona_%281858%29

Will take a look at the other vessel in a moment...

Having looked in my British Battleships book, a few things regarding your 'SMS Skorpione' which you could apply (but is not necessary as it is not the actual ship):

If you want it more like HMS Scorpion, then the forecastle should be raised.

Freeboard is given as 6 feet minimum with the belt sticking 3 1/4 feet below the water. You could play with the freeboard a bit more to gain a bit more HS.

But I do find it somewhat reassuring that I can come up with a design that seems to work.

------

Arcona, Germany Decked Corvette laid down 1858

Frigate (Unarmoured)

Displacement: 2,175 t light; 2,375 t standard; 2,552 t normal; 2,694 t full load

Dimensions: Length overall / water x beam x draught

216.61 ft / 208.50 ft x 42.65 ft x 20.67 ft (normal load) [66.02 m / 63.55 m x 13.00 m x 6.30 m]

Armament:

28 - 6.30" / 160 mm guns in single mounts, 64.00lbs / 29.03kg shells, 1858 Model Muzzle loading guns in broadside mounts on side, evenly spread; 28 guns on gundeck

(upper belt level) - Limited use in heavy seas

Weight of broadside 1,792 lbs / 813 kg

Shells per gun, main battery: 150

Machinery:

Coal fired boilers, simple reciprocating steam engines, Direct drive, 1 shaft, 1,607 ihp / 1,199 Kw = 12.00 kts

Range 1,100nm at 8.00 kts

Bunker at max displacement = 319 tons (100% coal)

Complement: 179 - 233

Cost: £0.338 million / $1.352 million

Distribution of weights at normal displacement:

Armament: 227 tons, 8.9 %

Machinery: 505 tons, 19.8 %

Hull, fittings & equipment: 1,292 tons, 50.6 %

Fuel, ammunition & stores: 377 tons, 14.8 %

Miscellaneous weights: 150 tons, 5.9 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 868 lbs / 394 Kg = 13.4 x 6.3 " / 160 mm shells or 0.2 torpedoes

Stability (Unstable if below 1.00): 1.25

Metacentric height 2.1 ft / 0.6 m

Roll period: 12.4 seconds

Steadiness - As gun platform (Average = 50 %): 94 %

- Recoil effect (Restricted arc if above 1.00): 0.70

Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:

Hull has a flush deck

Block coefficient: 0.486

Length to Beam Ratio: 4.89 : 1

'Natural speed' for length: 14.44 kts

Power going to wave formation at top speed: 41 %

Trim (Max stability = 0, Max steadiness = 100): 47

Bow angle (Positive = bow angles forward): 15.00 degrees

Stern overhang: 3.28 ft / 1.00 m

Freeboard (% = measuring location as a percentage of overall length):

- Stem: 18.04 ft / 5.50 m

- Forecastle (20 %): 17.22 ft / 5.25 m

- Mid (50 %): 16.40 ft / 5.00 m

- Quarterdeck (15 %): 16.40 ft / 5.00 m

- Stern: 16.40 ft / 5.00 m

- Average freeboard: 16.76 ft / 5.11 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 138.4 %

- Above water (accommodation/working, high = better): 99.1 %

Waterplane Area: 5,610 Square feet or 521 Square metres

Displacement factor (Displacement / loading): 83 %

Structure weight / hull surface area: 114 lbs/sq ft or 554 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 0.79

- Longitudinal: 8.78

- Overall: 1.00

Hull space for machinery, storage, compartmentation is cramped

Room for accommodation and workspaces is adequate

Ship has slow, easy roll, a good, steady gun platform

Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Breakdown of Miscellaneous Weight

Allowance for full sail rig and rigging - 150 tons

Fitted with lifting screw for cruising under sail

One of the early designs I find interesting is that of the Russian armored cruiser General Admiral. I have tried to approximate her here.

------

TBD, German Armored Frigate laid down 1870

Armoured Frigate (Broadside ironclad)

Displacement: 3,767 t light; 4,012 t standard; 5,023 t normal; 5,832 t full load

Dimensions: Length overall / water x beam x draught

291.79 ft / 285.83 ft x 48.00 ft x 24.41 ft (normal load) [88.94 m / 87.12 m x 14.63 m x 7.44 m]

Armament:

8 - 8.27" / 210 mm guns in single mounts, 180.01lbs / 81.65kg shells, 1870 Model Breech loading guns in broadside mounts on side, all amidships; 8 guns on gundeck (upper belt level) - Limited use in heavy seas

2 - 5.91" / 150 mm guns in single mounts, 99.21lbs / 45.00kg shells, 1870 Model Breech loading guns in deck mounts on centreline ends, evenly spread

4 - 3.15" / 80.0 mm guns in single mounts, 12.13lbs / 5.50kg shells, 1870 Model Breech loading guns in deck mounts on side ends, evenly spread

Weight of broadside 1,687 lbs / 765 kg

Shells per gun, main battery: 150

Armour:

Belts: Width (max) Length (avg) Height (avg)

Main: 5.91" / 150 mm 137.80 ft / 42.00 m 14.76 ft / 4.50 m

Ends: 4.72" / 120 mm 148.03 ft / 45.12 m 14.76 ft / 4.50 m

Main Belt covers 74 % of normal length

Machinery:

Coal fired boilers, simple reciprocating steam engines, Direct drive, 1 shaft, 2,077 ihp / 1,550 Kw = 12.00 kts

Range 4,800nm at 10.00 kts

Bunker at max displacement = 1,820 tons (100% coal)

Complement: 297 - 387

Cost: £0.389 million / $1.556 million

Distribution of weights at normal displacement:

Armament: 221 tons, 4.4 %

Armour: 952 tons, 19.0 %

- Belts: 952 tons, 19.0 %

- Torpedo bulkhead: 0 tons, 0.0 %

- Armament: 0 tons, 0.0 %

- Armour Deck: 0 tons, 0.0 %

- Conning Tower: 0 tons, 0.0 %

Machinery: 509 tons, 10.1 %

Hull, fittings & equipment: 1,785 tons, 35.5 %

Fuel, ammunition & stores: 1,256 tons, 25.0 %

Miscellaneous weights: 300 tons, 6.0 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 5,202 lbs / 2,360 Kg = 26.3 x 8.3 " / 210 mm shells or 1.0 torpedoes

Stability (Unstable if below 1.00): 1.25

Metacentric height 2.5 ft / 0.8 m

Roll period: 12.8 seconds

Steadiness - As gun platform (Average = 50 %): 84 %

- Recoil effect (Restricted arc if above 1.00): 0.36

Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:

Hull has a flush deck

Block coefficient: 0.525

Length to Beam Ratio: 5.95 : 1

'Natural speed' for length: 16.91 kts

Power going to wave formation at top speed: 32 %

Trim (Max stability = 0, Max steadiness = 100): 42

Bow angle (Positive = bow angles forward): 12.00 degrees

Stern overhang: 1.64 ft / 0.50 m

Freeboard (% = measuring location as a percentage of overall length):

- Stem: 20.34 ft / 6.20 m

- Forecastle (20 %): 18.37 ft / 5.60 m

- Mid (50 %): 16.40 ft / 5.00 m

- Quarterdeck (15 %): 16.40 ft / 5.00 m

- Stern: 16.40 ft / 5.00 m

- Average freeboard: 17.25 ft / 5.26 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 73.9 %

- Above water (accommodation/working, high = better): 97.6 %

Waterplane Area: 9,032 Square feet or 839 Square metres

Displacement factor (Displacement / loading): 124 %

Structure weight / hull surface area: 103 lbs/sq ft or 504 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 0.86

- Longitudinal: 3.84

- Overall: 1.00

Hull space for machinery, storage, compartmentation is excellent

Room for accommodation and workspaces is adequate

Ship has slow, easy roll, a good, steady gun platform

Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Breakdown of Miscellaneous Weight

200 tons reserved for masts and rigging

100 tons reserved for extra accommodation

------

TBD, German Armored Frigate laid down 1870

Armoured Frigate (Broadside ironclad)

Displacement: 3,767 t light; 4,012 t standard; 5,023 t normal; 5,832 t full load

Dimensions: Length overall / water x beam x draught

291.79 ft / 285.83 ft x 48.00 ft x 24.41 ft (normal load) [88.94 m / 87.12 m x 14.63 m x 7.44 m]

Armament:

8 - 8.27" / 210 mm guns in single mounts, 180.01lbs / 81.65kg shells, 1870 Model Breech loading guns in broadside mounts on side, all amidships; 8 guns on gundeck (upper belt level) - Limited use in heavy seas

2 - 5.91" / 150 mm guns in single mounts, 99.21lbs / 45.00kg shells, 1870 Model Breech loading guns in deck mounts on centreline ends, evenly spread

4 - 3.15" / 80.0 mm guns in single mounts, 12.13lbs / 5.50kg shells, 1870 Model Breech loading guns in deck mounts on side ends, evenly spread

Weight of broadside 1,687 lbs / 765 kg

Shells per gun, main battery: 150

Armour:

Belts: Width (max) Length (avg) Height (avg)

Main: 5.91" / 150 mm 137.80 ft / 42.00 m 14.76 ft / 4.50 m

Ends: 4.72" / 120 mm 148.03 ft / 45.12 m 14.76 ft / 4.50 m

Main Belt covers 74 % of normal length

Machinery:

Coal fired boilers, simple reciprocating steam engines, Direct drive, 1 shaft, 2,077 ihp / 1,550 Kw = 12.00 kts

Range 4,800nm at 10.00 kts

Bunker at max displacement = 1,820 tons (100% coal)

Complement: 297 - 387

Cost: £0.389 million / $1.556 million

Distribution of weights at normal displacement:

Armament: 221 tons, 4.4 %

Armour: 952 tons, 19.0 %

- Belts: 952 tons, 19.0 %

- Torpedo bulkhead: 0 tons, 0.0 %

- Armament: 0 tons, 0.0 %

- Armour Deck: 0 tons, 0.0 %

- Conning Tower: 0 tons, 0.0 %

Machinery: 509 tons, 10.1 %

Hull, fittings & equipment: 1,785 tons, 35.5 %

Fuel, ammunition & stores: 1,256 tons, 25.0 %

Miscellaneous weights: 300 tons, 6.0 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 5,202 lbs / 2,360 Kg = 26.3 x 8.3 " / 210 mm shells or 1.0 torpedoes

Stability (Unstable if below 1.00): 1.25

Metacentric height 2.5 ft / 0.8 m

Roll period: 12.8 seconds

Steadiness - As gun platform (Average = 50 %): 84 %

- Recoil effect (Restricted arc if above 1.00): 0.36

Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:

Hull has a flush deck

Block coefficient: 0.525

Length to Beam Ratio: 5.95 : 1

'Natural speed' for length: 16.91 kts

Power going to wave formation at top speed: 32 %

Trim (Max stability = 0, Max steadiness = 100): 42

Bow angle (Positive = bow angles forward): 12.00 degrees

Stern overhang: 1.64 ft / 0.50 m

Freeboard (% = measuring location as a percentage of overall length):

- Stem: 20.34 ft / 6.20 m

- Forecastle (20 %): 18.37 ft / 5.60 m

- Mid (50 %): 16.40 ft / 5.00 m

- Quarterdeck (15 %): 16.40 ft / 5.00 m

- Stern: 16.40 ft / 5.00 m

- Average freeboard: 17.25 ft / 5.26 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 73.9 %

- Above water (accommodation/working, high = better): 97.6 %

Waterplane Area: 9,032 Square feet or 839 Square metres

Displacement factor (Displacement / loading): 124 %

Structure weight / hull surface area: 103 lbs/sq ft or 504 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 0.86

- Longitudinal: 3.84

- Overall: 1.00

Hull space for machinery, storage, compartmentation is excellent

Room for accommodation and workspaces is adequate

Ship has slow, easy roll, a good, steady gun platform

Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Breakdown of Miscellaneous Weight

200 tons reserved for masts and rigging

100 tons reserved for extra accommodation

This is a design for a relatively simple ship sloop for service overseas; her dimensions were taken from a series of Russian 'clippers' built around 1860, but adapted to my own ideas. Something has to show the flag.

-----

TBD, German Ship Sloop laid down 1856

Corvette (Unarmoured)

Displacement: 1,170 t light; 1,225 t standard; 1,544 t normal; 1,800 t full load

Dimensions: Length overall / water x beam x draught

229.71 ft / 213.25 ft x 30.74 ft x 16.01 ft (normal load) [70.02 m / 65.00 m x 9.37 m x 4.88 m]

Armament:

6 - 6.30" / 160 mm guns in single mounts, 64.00lbs / 29.03kg shells, 1856 Model Muzzle loading guns in broadside mounts on side, evenly spread

2 - 4.13" / 105 mm guns in single mounts, 17.99lbs / 8.16kg shells, 1856 Model Muzzle loading guns in deck mounts on centreline ends, evenly spread

Weight of broadside 420 lbs / 190 kg

Shells per gun, main battery: 100

Machinery:

Coal fired boilers, simple reciprocating steam engines, Direct drive, 1 shaft, 625 ihp / 466 Kw = 10.00 kts

Range 4,500nm at 6.00 kts

Bunker at max displacement = 576 tons (100% coal)

Complement: 123 - 160

Cost: £0.116 million / $0.463 million

Distribution of weights at normal displacement:

Armament: 50 tons, 3.3 %

Machinery: 233 tons, 15.1 %

Hull, fittings & equipment: 727 tons, 47.0 %

Fuel, ammunition & stores: 375 tons, 24.2 %

Miscellaneous weights: 160 tons, 10.4 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 918 lbs / 416 Kg = 15.0 x 6.3 " / 160 mm shells or 0.3 torpedoes

Stability (Unstable if below 1.00): 1.15

Metacentric height 1.1 ft / 0.3 m

Roll period: 12.2 seconds

Steadiness - As gun platform (Average = 50 %): 76 %

- Recoil effect (Restricted arc if above 1.00): 0.48

Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:

Hull has a flush deck

Block coefficient: 0.515

Length to Beam Ratio: 6.94 : 1

'Natural speed' for length: 14.60 kts

Power going to wave formation at top speed: 28 %

Trim (Max stability = 0, Max steadiness = 100): 38

Bow angle (Positive = bow angles forward): 50.00 degrees

Stern overhang: 0.82 ft / 0.25 m

Freeboard (% = measuring location as a percentage of overall length):

- Stem: 13.12 ft / 4.00 m

- Forecastle (20 %): 12.30 ft / 3.75 m

- Mid (50 %): 11.48 ft / 3.50 m

- Quarterdeck (15 %): 11.48 ft / 3.50 m

- Stern: 11.48 ft / 3.50 m

- Average freeboard: 11.84 ft / 3.61 m

Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 85.1 %

- Above water (accommodation/working, high = better): 77.2 %

Waterplane Area: 4,268 Square feet or 397 Square metres

Displacement factor (Displacement / loading): 150 %

Structure weight / hull surface area: 84 lbs/sq ft or 412 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 0.85

- Longitudinal: 4.24

- Overall: 1.00

Hull space for machinery, storage, compartmentation is adequate

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

Breakdown of Miscellaneous Weight

120 tons allowed for full ship rig

40 tons allowed for extra stores on overseas station

Fitted with a lifting screw

-----

TBD, German Ship Sloop laid down 1856

Corvette (Unarmoured)

Displacement: 1,170 t light; 1,225 t standard; 1,544 t normal; 1,800 t full load

Dimensions: Length overall / water x beam x draught

229.71 ft / 213.25 ft x 30.74 ft x 16.01 ft (normal load) [70.02 m / 65.00 m x 9.37 m x 4.88 m]

Armament:

6 - 6.30" / 160 mm guns in single mounts, 64.00lbs / 29.03kg shells, 1856 Model Muzzle loading guns in broadside mounts on side, evenly spread

2 - 4.13" / 105 mm guns in single mounts, 17.99lbs / 8.16kg shells, 1856 Model Muzzle loading guns in deck mounts on centreline ends, evenly spread

Weight of broadside 420 lbs / 190 kg

Shells per gun, main battery: 100

Machinery:

Coal fired boilers, simple reciprocating steam engines, Direct drive, 1 shaft, 625 ihp / 466 Kw = 10.00 kts

Range 4,500nm at 6.00 kts

Bunker at max displacement = 576 tons (100% coal)

Complement: 123 - 160

Cost: £0.116 million / $0.463 million

Distribution of weights at normal displacement:

Armament: 50 tons, 3.3 %

Machinery: 233 tons, 15.1 %

Hull, fittings & equipment: 727 tons, 47.0 %

Fuel, ammunition & stores: 375 tons, 24.2 %

Miscellaneous weights: 160 tons, 10.4 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 918 lbs / 416 Kg = 15.0 x 6.3 " / 160 mm shells or 0.3 torpedoes

Stability (Unstable if below 1.00): 1.15

Metacentric height 1.1 ft / 0.3 m

Roll period: 12.2 seconds

Steadiness - As gun platform (Average = 50 %): 76 %

- Recoil effect (Restricted arc if above 1.00): 0.48

Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:

Hull has a flush deck

Block coefficient: 0.515

Length to Beam Ratio: 6.94 : 1

'Natural speed' for length: 14.60 kts

Power going to wave formation at top speed: 28 %

Trim (Max stability = 0, Max steadiness = 100): 38

Bow angle (Positive = bow angles forward): 50.00 degrees

Stern overhang: 0.82 ft / 0.25 m

Freeboard (% = measuring location as a percentage of overall length):

- Stem: 13.12 ft / 4.00 m

- Forecastle (20 %): 12.30 ft / 3.75 m

- Mid (50 %): 11.48 ft / 3.50 m

- Quarterdeck (15 %): 11.48 ft / 3.50 m

- Stern: 11.48 ft / 3.50 m

- Average freeboard: 11.84 ft / 3.61 m

Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 85.1 %

- Above water (accommodation/working, high = better): 77.2 %

Waterplane Area: 4,268 Square feet or 397 Square metres

Displacement factor (Displacement / loading): 150 %

Structure weight / hull surface area: 84 lbs/sq ft or 412 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 0.85

- Longitudinal: 4.24

- Overall: 1.00

Hull space for machinery, storage, compartmentation is adequate

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

Breakdown of Miscellaneous Weight

120 tons allowed for full ship rig

40 tons allowed for extra stores on overseas station

Fitted with a lifting screw

Tried my hand at something slightly different, an auxiliary cruiser inspired by the famous Confederate raider Alabama.

For this reason all the guns are on the main deck - two heavy RML guns in pivot mounts on the centerline and six 32-pounders as broadside guns.

One general question for the house: Is it reasonable to make allowance in the miscellaneous weight for the masts and rigging a vessel of this period would carry, and am I allowing too much or too little?

-----

Sorta-Alabama, Confederate States Auxiliary Cruiser laid down 1862

Corvette (Unarmoured)

Displacement: 1,650 t light; 1,718 t standard; 1,932 t normal; 2,103 t full load

Dimensions: Length overall / water x beam x draught

219.82 ft / 219.82 ft x 31.66 ft x 17.65 ft (normal load) [67.00 m / 67.00 m x 9.65 m x 5.38 m]

Armament:

2 - 7.09" / 180 mm guns in single mounts, 103.21lbs / 46.81kg shells, 1862 Model Muzzle loading guns in deck mounts on centreline ends, evenly spread

6 - 4.80" / 122 mm guns in single mounts, 32.13lbs / 14.58kg shells, 1862 Model Muzzle loading guns in broadside mounts on side, evenly spread

Weight of broadside 399 lbs / 181 kg

Shells per gun, main battery: 120

Machinery:

Coal fired boilers, simple reciprocating steam engines, Direct drive, 1 shaft, 1,743 ihp / 1,300 Kw = 13.00 kts

Range 2,000nm at 8.00 kts

Bunker at max displacement = 385 tons (100% coal)

Complement: 145 - 189

Cost: £0.173 million / $0.692 million

Distribution of weights at normal displacement:

Armament: 50 tons, 2.6 %

Machinery: 524 tons, 27.1 %

Hull, fittings & equipment: 926 tons, 48.0 %

Fuel, ammunition & stores: 282 tons, 14.6 %

Miscellaneous weights: 150 tons, 7.8 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 938 lbs / 425 Kg = 9.1 x 7.1 " / 180 mm shells or 0.3 torpedoes

Stability (Unstable if below 1.00): 1.10

Metacentric height 1.1 ft / 0.3 m

Roll period: 12.9 seconds

Steadiness - As gun platform (Average = 50 %): 68 %

- Recoil effect (Restricted arc if above 1.00): 0.55

Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:

Hull has a flush deck

Block coefficient: 0.550

Length to Beam Ratio: 6.94 : 1

'Natural speed' for length: 14.83 kts

Power going to wave formation at top speed: 41 %

Trim (Max stability = 0, Max steadiness = 100): 34

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: 18.04 ft / 5.50 m

- Forecastle (20 %): 17.22 ft / 5.25 m

- Mid (50 %): 16.40 ft / 5.00 m

- Quarterdeck (15 %): 16.40 ft / 5.00 m

- Stern: 16.40 ft / 5.00 m

- Average freeboard: 16.76 ft / 5.11 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 116.1 %

- Above water (accommodation/working, high = better): 102.7 %

Waterplane Area: 4,713 Square feet or 438 Square metres

Displacement factor (Displacement / loading): 121 %

Structure weight / hull surface area: 77 lbs/sq ft or 378 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 0.78

- Longitudinal: 10.24

- Overall: 1.01

Hull space for machinery, storage, compartmentation is cramped

Room for accommodation and workspaces is adequate

Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Breakdown of Miscellaneous Weight

Allowance for masts and rigging - 120 tons

Provision for extra stores - 30 tons

Fitted with a lifting screw

For this reason all the guns are on the main deck - two heavy RML guns in pivot mounts on the centerline and six 32-pounders as broadside guns.

One general question for the house: Is it reasonable to make allowance in the miscellaneous weight for the masts and rigging a vessel of this period would carry, and am I allowing too much or too little?

-----

Sorta-Alabama, Confederate States Auxiliary Cruiser laid down 1862

Corvette (Unarmoured)

Displacement: 1,650 t light; 1,718 t standard; 1,932 t normal; 2,103 t full load

Dimensions: Length overall / water x beam x draught

219.82 ft / 219.82 ft x 31.66 ft x 17.65 ft (normal load) [67.00 m / 67.00 m x 9.65 m x 5.38 m]

Armament:

2 - 7.09" / 180 mm guns in single mounts, 103.21lbs / 46.81kg shells, 1862 Model Muzzle loading guns in deck mounts on centreline ends, evenly spread

6 - 4.80" / 122 mm guns in single mounts, 32.13lbs / 14.58kg shells, 1862 Model Muzzle loading guns in broadside mounts on side, evenly spread

Weight of broadside 399 lbs / 181 kg

Shells per gun, main battery: 120

Machinery:

Coal fired boilers, simple reciprocating steam engines, Direct drive, 1 shaft, 1,743 ihp / 1,300 Kw = 13.00 kts

Range 2,000nm at 8.00 kts

Bunker at max displacement = 385 tons (100% coal)

Complement: 145 - 189

Cost: £0.173 million / $0.692 million

Distribution of weights at normal displacement:

Armament: 50 tons, 2.6 %

Machinery: 524 tons, 27.1 %

Hull, fittings & equipment: 926 tons, 48.0 %

Fuel, ammunition & stores: 282 tons, 14.6 %

Miscellaneous weights: 150 tons, 7.8 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 938 lbs / 425 Kg = 9.1 x 7.1 " / 180 mm shells or 0.3 torpedoes

Stability (Unstable if below 1.00): 1.10

Metacentric height 1.1 ft / 0.3 m

Roll period: 12.9 seconds

Steadiness - As gun platform (Average = 50 %): 68 %

- Recoil effect (Restricted arc if above 1.00): 0.55

Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:

Hull has a flush deck

Block coefficient: 0.550

Length to Beam Ratio: 6.94 : 1

'Natural speed' for length: 14.83 kts

Power going to wave formation at top speed: 41 %

Trim (Max stability = 0, Max steadiness = 100): 34

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: 18.04 ft / 5.50 m

- Forecastle (20 %): 17.22 ft / 5.25 m

- Mid (50 %): 16.40 ft / 5.00 m

- Quarterdeck (15 %): 16.40 ft / 5.00 m

- Stern: 16.40 ft / 5.00 m

- Average freeboard: 16.76 ft / 5.11 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 116.1 %

- Above water (accommodation/working, high = better): 102.7 %

Waterplane Area: 4,713 Square feet or 438 Square metres

Displacement factor (Displacement / loading): 121 %

Structure weight / hull surface area: 77 lbs/sq ft or 378 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 0.78

- Longitudinal: 10.24

- Overall: 1.01

Hull space for machinery, storage, compartmentation is cramped

Room for accommodation and workspaces is adequate

Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Breakdown of Miscellaneous Weight

Allowance for masts and rigging - 120 tons

Provision for extra stores - 30 tons

Fitted with a lifting screw

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