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1

Tuesday, February 4th 2014, 5:52pm

Arcona class Decked Corvette

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?

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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

2

Wednesday, February 5th 2014, 2:18pm

Masted Turret Ship

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?

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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

3

Wednesday, February 5th 2014, 4:13pm

SMS Arcona...

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...

4

Wednesday, February 5th 2014, 4:27pm

I have already realized that the Arcona's guns ought to be broadside rather than deck mount; not certain if that makes a serious difference or not - the revised Springsharp didn't seem to change much.

5

Wednesday, February 5th 2014, 5:02pm

Well, making them broadside does not do much. Making them broadsid and throwing them a deck lower does a bit more.

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.

6

Wednesday, February 5th 2014, 7:02pm

You are quite correct Walter; moving the armament down to the gun deck significantly changes things. I think that the overall length dimension cited must include the bowsprit, which would not feature in the length for Springsharp. I have tried to reduce the sheer in the hull. This might be better considered to be a vessel based on the design of the Arcona rather than a Springsharp of the Arcona itself.

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

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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

7

Wednesday, February 5th 2014, 7:26pm

As far as I know, adjusting the length overall in springsharp has no effect on the design's stability, seakeeping, hullstrength, etc. It is only to make the numbers (well, only the length overall value) visually more correct. Having done a simple test earlier, I used something like 40 degrees for the bow to match the length overall of the Arcona.

8

Wednesday, February 5th 2014, 8:02pm

There is something to be said for that.

I tried futzing with bow angles in my Springsharp and found that 50 degrees got pretty close; numerically that seems pretty sharp but looking at the available pictures it might not be too far off.

9

Thursday, February 6th 2014, 5:41pm

Armored Frigate Design Sketch

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

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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

10

Friday, February 7th 2014, 6:24pm

Ship Sloop Design Sketch

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.

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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

11

Saturday, February 8th 2014, 10:37am

This is an interesting series of historical ships. I haven't simmed anything older than the 1920s in SS for a long time, perhaps I should for some R&R?

12

Saturday, February 8th 2014, 9:20pm

It is interesting to try something outside the norm. And going back a few decades there are such interesting designs to choose from as inspiration.

13

Sunday, February 9th 2014, 12:42am

Sorta-Alabama

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

14

Sunday, February 9th 2014, 9:09am

When I design any sailing ship in springsharp I use about ten to fifteen percent of displacement in misc weight for masts and rigging.