1919 CDS

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While eventually this design is bound for my Pallamaran AU, for the moment it's too theoretical to post there. More intended as a technical study, the design is geared towards being a floating battery.

Armament currently is 4 American 12"/50 Mk 7, in twin turrets and 18 x 7"/45 Mk 2 guns. The guns were likely purchased before the war, but the war intervened and nothing is getting built until 1919. Mostly, I wanted to test out the concept of broad, beamy designs with large bulges. I've Springsharped this design, and it likes it rather much, though at the levels of protection I've generated it at, the design weighs in at about 12,000 tons, the displacement of earlier predreads, which the vessel resembles. The levels of protection, 11" belt and 5" deck are purchased at the expense of speed and range, neither a great consideration for a CDS. I'm currently experimenting with 14" guns, but that will require reducing the protection levels. My main interest is whether the bulge protection is viable in this period. The vessel has a draft of 15 feet, is 90 feet wide, and bulged to 120 feet. I wanted it to be an early experiment in massive bulge protection. I've never tried to draw bulges in before, so this is also a first in that sense. I'll post the initial SS momentarily.

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"That is a very graphic analogy which aids understanding wonderfully while being, strictly speaking, wrong in every possible way."

Now, the Springsharp:

Displacement:
11,590 t light; 12,237 t standard; 12,518 t normal; 12,743 t full load

Dimensions: Length overall / water x beam x draught
405.00 ft / 405.00 ft x 90.00 ft (Bulges 120.00 ft) x 15.00 ft (normal load)
123.44 m / 123.44 m x 27.43 m (Bulges 36.58 m) x 4.57 m

Armament:
4 - 12.00" / 305 mm guns (2x2 guns), 864.00lbs / 391.90kg shells, 1912 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread, 1 raised mount
18 - 7.00" / 178 mm guns in single mounts, 171.50lbs / 77.79kg shells, 1906 Model
Breech loading guns in casemate mounts
on side, all amidships
10 guns in hull casemates - Limited use in all but light seas
8 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1919 Model
Quick firing guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 6,651 lbs / 3,017 kg
Shells per gun, main battery: 100

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 11.0" / 279 mm 182.01 ft / 55.48 m 11.38 ft / 3.47 m
Ends: Unarmoured
Main Belt covers 69 % of normal length

- Torpedo Bulkhead and Bulges:
2.00" / 51 mm 182.01 ft / 55.48 m 14.15 ft / 4.31 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 10.0" / 254 mm 6.00" / 152 mm 9.00" / 229 mm
2nd: 6.00" / 152 mm - -
3rd: 2.00" / 51 mm - -

- Armour deck: 5.00" / 127 mm, Conning tower: 10.00" / 254 mm

Machinery:
Oil fired boilers, steam turbines,
Direct drive, 2 shafts, 3,368 shp / 2,513 Kw = 12.00 kts
Range 5,000nm at 8.00 kts
Bunker at max displacement = 506 tons

Complement:
591 - 769

Cost:
£2.445 million / $9.781 million

Distribution of weights at normal displacement:
Armament: 831 tons, 6.6 %
Armour: 5,165 tons, 41.3 %
- Belts: 1,177 tons, 9.4 %
- Torpedo bulkhead: 191 tons, 1.5 %
- Armament: 1,212 tons, 9.7 %
- Armour Deck: 2,468 tons, 19.7 %
- Conning Tower: 116 tons, 0.9 %
Machinery: 120 tons, 1.0 %
Hull, fittings & equipment: 5,475 tons, 43.7 %
Fuel, ammunition & stores: 928 tons, 7.4 %
Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
28,039 lbs / 12,718 Kg = 32.5 x 12.0 " / 305 mm shells or 8.1 torpedoes
Stability (Unstable if below 1.00): 1.47
Metacentric height 8.2 ft / 2.5 m
Roll period: 17.6 seconds
Steadiness - As gun platform (Average = 50 %): 95 %
- Recoil effect (Restricted arc if above 1.00): 0.14
Seaboat quality (Average = 1.00): 1.50

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.601
Length to Beam Ratio: 3.38 : 1
'Natural speed' for length: 20.12 kts
Power going to wave formation at top speed: 28 %
Trim (Max stability = 0, Max steadiness = 100): 63
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: 24.50 ft / 7.47 m
- Forecastle (28 %): 23.00 ft / 7.01 m
- Mid (50 %): 14.09 ft / 4.29 m
- Quarterdeck (28 %): 14.09 ft / 4.29 m
- Stern: 14.09 ft / 4.29 m
- Average freeboard: 17.71 ft / 5.40 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 69.1 %
- Above water (accommodation/working, high = better): 140.3 %
Waterplane Area: 26,684 Square feet or 2,479 Square metres
Displacement factor (Displacement / loading): 104 %
Structure weight / hull surface area: 152 lbs/sq ft or 743 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.92
- Longitudinal: 2.10
- Overall: 1.00
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

In an alternate version, I'm increasing the speed to max of 15 kts and cruising to 10 kts, but for a CDS, I'm not sure if the extra is worth it.

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Here is my redone version, which I'm happier with. It loses some of the 7"/45 weapons in exchange for better protection, better seakeeping, and makes the remaining ones more useful being higher up on the ship's hull. While seakeeping isn't nominally important to the ship's intended purpose, it does *Look* like a predread BB, so it isn't too unlikely it would be sent on port calls and to represent the nation at the Spithead Naval Review and such.

is it me, or does the gun tubes being lighter colour scheme than the rest of the ship? Other than that, its quite wacky design...in a good way;)

Updated Springsharp.

SMS Erinyes, Pallamaran Coastal Defence Battleship laid down 1919

Displacement:
11,911 t light; 12,503 t standard; 12,935 t normal; 13,280 t full load

Dimensions: Length overall / water x beam x draught
405.00 ft / 405.00 ft x 90.00 ft (Bulges 120.00 ft) x 15.00 ft (normal load)
123.44 m / 123.44 m x 27.43 m (Bulges 36.58 m) x 4.57 m

Armament:
4 - 12.00" / 305 mm guns (2x2 guns), 864.00lbs / 391.90kg shells, 1912 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread
12 - 7.00" / 178 mm guns in single mounts, 171.50lbs / 77.79kg shells, 1906 Model
Breech loading guns in casemate mounts
on side, all amidships
12 guns in hull casemates - Limited use in heavy seas
10 - 3.00" / 76.2 mm guns (8 mounts), 13.50lbs / 6.12kg shells, 1919 Model
Breech loading guns in deck mounts
on side, evenly spread, 10 raised mounts
Weight of broadside 5,649 lbs / 2,562 kg
Shells per gun, main battery: 100

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 11.0" / 279 mm 165.08 ft / 50.32 m 11.38 ft / 3.47 m
Ends: Unarmoured
Main Belt covers 63 % of normal length

- Torpedo Bulkhead and Bulges:
2.00" / 51 mm 165.08 ft / 50.32 m 14.26 ft / 4.35 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 12.0" / 305 mm 6.00" / 152 mm 10.0" / 254 mm
2nd: 6.00" / 152 mm - -
3rd: 2.00" / 51 mm - -

- Armour deck: 5.00" / 127 mm, Conning tower: 10.00" / 254 mm

Machinery:
Oil fired boilers, steam turbines,
Direct drive, 2 shafts, 7,655 shp / 5,711 Kw = 15.00 kts
Range 5,000nm at 10.00 kts
Bunker at max displacement = 777 tons

Complement:
606 - 788

Cost:
£2.287 million / $9.147 million

Distribution of weights at normal displacement:
Armament: 706 tons, 5.5 %
Armour: 5,127 tons, 39.6 %
- Belts: 1,110 tons, 8.6 %
- Torpedo bulkhead: 174 tons, 1.3 %
- Armament: 1,209 tons, 9.3 %
- Armour Deck: 2,515 tons, 19.4 %
- Conning Tower: 119 tons, 0.9 %
Machinery: 272 tons, 2.1 %
Hull, fittings & equipment: 5,807 tons, 44.9 %
Fuel, ammunition & stores: 1,023 tons, 7.9 %
Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
38,761 lbs / 17,582 Kg = 44.9 x 12.0 " / 305 mm shells or 10.1 torpedoes
Stability (Unstable if below 1.00): 1.51
Metacentric height 8.7 ft / 2.6 m
Roll period: 17.1 seconds
Steadiness - As gun platform (Average = 50 %): 100 %
- Recoil effect (Restricted arc if above 1.00): 0.16
Seaboat quality (Average = 1.00): 1.97

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.621
Length to Beam Ratio: 3.38 : 1
'Natural speed' for length: 20.12 kts
Power going to wave formation at top speed: 39 %
Trim (Max stability = 0, Max steadiness = 100): 51
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: 24.50 ft / 7.47 m
- Forecastle (30 %): 23.00 ft / 7.01 m
- Mid (50 %): 23.00 ft / 7.01 m
- Quarterdeck (30 %): 23.00 ft / 7.01 m
- Stern: 23.00 ft / 7.01 m
- Average freeboard: 23.18 ft / 7.06 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 62.7 %
- Above water (accommodation/working, high = better): 196.5 %
Waterplane Area: 27,186 Square feet or 2,526 Square metres
Displacement factor (Displacement / loading): 114 %
Structure weight / hull surface area: 150 lbs/sq ft or 734 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.88
- Longitudinal: 3.05
- Overall: 1.00
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

Quote:

is it me, or does the gun tubes being lighter colour scheme than the rest of the ship? Other than that, its quite wacky design...in a good way;)

You're right. I didn't like the 12"/50 turret in the parts sheet, so I modified the Alaska Turret to make one since the guns were the same size, but forgot to alter the gun barrels in the process. I will make sure I do that when I post the rebuild here.

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Here is my 1930s rebuild, still a WIP, but progress so far. The Panzerschiff was much admired during this period, and the rebuild sought to emulate it somewhat.

The 20mm Quads are a Pallamaran weapon. At this time, many in the Staadtmarine thought nothing between 5" and 20mm was needed, though the CLs carried quad 2 pounders.

I like this ship. CDS vessels are rare on these boards.
Quite a sound design, although the foremast seems a bit heavy with all those platfrom etc on it. Certainly looks right period wise and the deep hull for the barbettes is also good to compensate for the need for small draught. The 30s refit looks a bit too Germanic for my tastes but overall I look forward to seeing this progress.

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