1920s Costal battleship design challenge.

[Rowdy36]

Although I know nothing about these types of ships I thought it would be a nice challenge so I gave it a go:



HMRS Carronade, Recherche Coast Defence Ship laid down 1922

Displacement:
7,200 t light; 7,658 t standard; 7,925 t normal; 8,138 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(398.38 ft / 393.70 ft) x 65.62 ft x (19.52 / 19.93 ft)
(121.43 m / 120.00 m) x 20.00 m x (5.95 / 6.08 m)

Armament:
4 - 12.00" / 305 mm 45.0 cal guns - 849.99lbs / 385.55kg shells, 120 per gun
Breech loading guns in turret on barbette mounts, 1906 Model
2 x Twin mounts on centreline ends, evenly spread
6 - 6.00" / 152 mm 50.0 cal guns - 100.00lbs / 45.36kg shells, 200 per gun
Breech loading guns in deck mounts, 1906 Model
4 x Single mounts on sides, evenly spread
2 x Single mounts on centreline ends, evenly spread
2 raised mounts
4 - 1.57" / 40.0 mm 45.0 cal guns - 1.96lbs / 0.89kg shells, 1,500 per gun
Anti-air guns in deck mounts, 1922 Model
4 x Single mounts on sides, aft evenly spread
4 raised mounts
Weight of broadside 4,008 lbs / 1,818 kg

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 9.00" / 229 mm 235.00 ft / 71.63 m 10.00 ft / 3.05 m
Ends: Unarmoured
Upper: 4.00" / 102 mm 235.00 ft / 71.63 m 8.00 ft / 2.44 m
Main Belt covers 92 % of normal length

- Torpedo Bulkhead - Additional damage containing bulkheads:
2.00" / 51 mm 235.00 ft / 71.63 m 17.00 ft / 5.18 m
Beam between torpedo bulkheads 46.00 ft / 14.02 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 9.00" / 229 mm 6.00" / 152 mm 8.00" / 203 mm
2nd: 2.00" / 51 mm - -

- Armoured deck - multiple decks:
For and Aft decks: 2.10" / 53 mm

- Conning towers: Forward 9.00" / 229 mm, Aft 0.00" / 0 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 14,336 shp / 10,695 Kw = 20.00 kts
Range 5,000nm at 10.00 kts
Bunker at max displacement = 480 tons

Complement:
419 - 545

Cost:
£1.846 million / $7.383 million

Distribution of weights at normal displacement:
Armament: 719 tons, 9.1 %
- Guns: 719 tons, 9.1 %
Armour: 2,778 tons, 35.1 %
- Belts: 1,282 tons, 16.2 %
- Torpedo bulkhead: 296 tons, 3.7 %
- Armament: 549 tons, 6.9 %
- Armour Deck: 575 tons, 7.3 %
- Conning Tower: 77 tons, 1.0 %
Machinery: 486 tons, 6.1 %
Hull, fittings & equipment: 2,967 tons, 37.4 %
Fuel, ammunition & stores: 725 tons, 9.1 %
Miscellaneous weights: 250 tons, 3.2 %
- Hull above water: 100 tons
- On freeboard deck: 100 tons
- Above deck: 50 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
14,025 lbs / 6,362 Kg = 16.2 x 12.0 " / 305 mm shells or 3.2 torpedoes
Stability (Unstable if below 1.00): 1.23
Metacentric height 3.9 ft / 1.2 m
Roll period: 14.0 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.63
Seaboat quality (Average = 1.00): 1.55

Hull form characteristics:
Hull has a flush deck,
a normal bow and a cruiser stern
Block coefficient (normal/deep): 0.550 / 0.553
Length to Beam Ratio: 6.00 : 1
'Natural speed' for length: 19.84 kts
Power going to wave formation at top speed: 50 %
Trim (Max stability = 0, Max steadiness = 100): 45
Bow angle (Positive = bow angles forward): 12.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 22.00 ft / 6.71 m, 18.50 ft / 5.64 m
- Forward deck: 30.00 %, 18.50 ft / 5.64 m, 15.00 ft / 4.57 m
- Aft deck: 35.00 %, 15.00 ft / 4.57 m, 15.00 ft / 4.57 m
- Quarter deck: 15.00 %, 15.00 ft / 4.57 m, 15.00 ft / 4.57 m
- Average freeboard: 16.51 ft / 5.03 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 90.7 %
- Above water (accommodation/working, high = better): 129.6 %
Waterplane Area: 18,029 Square feet or 1,675 Square metres
Displacement factor (Displacement / loading): 107 %
Structure weight / hull surface area: 125 lbs/sq ft or 612 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.91
- Longitudinal: 2.43
- Overall: 1.00
Adequate machinery, storage, compartmentation space
Excellent accommodation and workspace room
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

[Novice]

Nice ship Rowdy36

[KHT]

Indeed, a very nice craft.

I'm afraid I won't post a proper drawing of my designs, due to a drop in interest of a design of my own.

Btw, JSB, I just noticed something about your springsharp report for your Dutch pocket battleship. Since she's using German equipment, you might as well get the calibers correct. The main guns aren't 11 British inches(279 mm), but 11,5 Prussian inches(283 mm). If you go to the metric scale and enter 283 mm, and set the gun calibers to 52, the gun size will be correct. I'd suggest doing the same for the 6" guns, which shouldn't be 152 mm, but 149 mm, and correcting the caliber length for the guns(I don't know if you're using the 15cm/60 SK C/25 or the 15cm/55 SK C/28). Remember to set the shell weights as well(yes, when springsharping using RL equipment, you should be this nit-picky).

[Yasutomi]

Not really an "entry" as such (my efforts aren't really competitive), but as this seemed like a fun challenge I decided to go ahead and draw up a design for an on-off (mostly off) AU project, the Samudran Federation. Due to time and skill constraints, it is a bit of a kitbash of Jabba's drawing of HMS Nelson and I'm not massively happy with some of the detailing (the rigging in particular- any guidance would be appreciated), but please bear with me as it is only the second drawing I've seen fit to present here.



A few brief comments on the design. Yes, it does exceed the 10k displacement limit and so in some respects is approaching a small battleship rather than a classic CDS. I've also prioritised armament (4x 13.5'/45 Mk Vs) and armour (12' main belt) over speed (supposedly 24 kts, but frankly I'm sceptical of this), as in my view the true role of the CDS is deterrence: the object of these ships isn't to dual with cruisers- let alone battleships- on the high seas, but rather to force a potential aggressor to risk larger and more expensive capital ships in defended coastal waters, where they are vulnerable to minefields, shore artillery and fast attack craft.

Mandeville, Samudran Federation Coastal Battleship laid down 1922

Displacement:
12,463 t light; 13,251 t standard; 13,577 t normal; 13,838 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(454.99 ft / 450.00 ft) x 88.00 ft x (20.00 / 20.32 ft)
(138.68 m / 137.16 m) x 26.82 m x (6.10 / 6.19 m)

Armament:
4 - 13.50" / 343 mm 45.0 cal guns - 1,400.00lbs / 635.03kg shells, 150 per gun
Breech loading guns in turret on barbette mounts, 1912 Model
2 x 2-gun mounts on centreline ends, evenly spread
4 - 6.00" / 152 mm 50.0 cal guns - 100.00lbs / 45.36kg shells, 150 per gun
Breech loading guns in deck and hoist mounts, 1922 Model
2 x 2-gun mounts on centreline ends, evenly spread
2 raised mounts
4 - 4.70" / 119 mm 40.0 cal guns - 50.00lbs / 22.68kg shells, 150 per gun
Anti-air guns in deck mounts, 1922 Model
4 x Single mounts on sides, evenly spread
4 raised mounts
Weight of broadside 6,200 lbs / 2,812 kg

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 12.0" / 305 mm 274.50 ft / 83.67 m 12.00 ft / 3.66 m
Ends: Unarmoured
Main Belt covers 94 % of normal length

- Torpedo Bulkhead - Strengthened structural bulkheads:
4.00" / 102 mm 274.50 ft / 83.67 m 18.00 ft / 5.49 m
Beam between torpedo bulkheads 70.00 ft / 21.34 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 12.0" / 305 mm 8.00" / 203 mm 8.00" / 203 mm
2nd: 4.00" / 102 mm 2.00" / 51 mm 4.00" / 102 mm

- Armoured deck - single deck:
For and Aft decks: 4.00" / 102 mm

- Conning towers: Forward 12.00" / 305 mm, Aft 0.00" / 0 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 41,862 shp / 31,229 Kw = 24.00 kts
Range 4,000nm at 10.00 kts
Bunker at max displacement = 587 tons

Complement:
628 - 817

Cost:
£3.148 million / $12.593 million

Distribution of weights at normal displacement:
Armament: 1,212 tons, 8.9 %
- Guns: 1,212 tons, 8.9 %
Armour: 5,235 tons, 38.6 %
- Belts: 1,821 tons, 13.4 %
- Torpedo bulkhead: 731 tons, 5.4 %
- Armament: 853 tons, 6.3 %
- Armour Deck: 1,683 tons, 12.4 %
- Conning Tower: 147 tons, 1.1 %
Machinery: 1,420 tons, 10.5 %
Hull, fittings & equipment: 4,596 tons, 33.9 %
Fuel, ammunition & stores: 1,114 tons, 8.2 %
Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
25,424 lbs / 11,532 Kg = 20.7 x 13.5 " / 343 mm shells or 5.1 torpedoes
Stability (Unstable if below 1.00): 1.43
Metacentric height 7.7 ft / 2.3 m
Roll period: 13.3 seconds
Steadiness - As gun platform (Average = 50 %): 53 %
- Recoil effect (Restricted arc if above 1.00): 0.35
Seaboat quality (Average = 1.00): 1.06

Hull form characteristics:
Hull has a flush deck,
a normal bow and a cruiser stern
Block coefficient (normal/deep): 0.600 / 0.602
Length to Beam Ratio: 5.11 : 1
'Natural speed' for length: 21.21 kts
Power going to wave formation at top speed: 59 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 14.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 20.00 ft / 6.10 m, 20.00 ft / 6.10 m
- Forward deck: 30.00 %, 20.00 ft / 6.10 m, 20.00 ft / 6.10 m
- Aft deck: 31.00 %, 20.00 ft / 6.10 m, 20.00 ft / 6.10 m
- Quarter deck: 19.00 %, 20.00 ft / 6.10 m, 20.00 ft / 6.10 m
- Average freeboard: 20.00 ft / 6.10 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 88.7 %
- Above water (accommodation/working, high = better): 175.7 %
Waterplane Area: 28,963 Square feet or 2,691 Square metres
Displacement factor (Displacement / loading): 104 %
Structure weight / hull surface area: 154 lbs/sq ft or 753 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.90
- Longitudinal: 2.43
- Overall: 1.00
Adequate machinery, storage, compartmentation space
Excellent accommodation and workspace room

Comments and suggestions are more than welcome, as I would be interested in refining this concept!

[Rodondo]

Some very nice drawings here!


Here's my 1920s CDS entry

[JSB]

I like ,
If nobody has any more then shall we vote?

So the entries so far,

Karle94 (sorry I didn't pick it up in a hidden spoiler)


Krakatoa

+

denodon

Yasutomi

Rowdy36

Rodondo
[/quote]
Cei

JSB(my entrys)




heuhen Not in the comp + Cheating apparently

[/quote]


JSB

PS yes KHT it should (but then I should also finish some of my drawing to I just like the ideas/preliminaries but not the detail, will have to work on finishing stuff and not getting distracted).

[Karle94]

Where is my entry?

[adenandy]

I have to be honest and say that I think voting on just "One" would do all the others a disservice, because I think they're ALL winners. I think they're all really good.

Well done EVERYBODY

[ALVAMA]

'' 2 improved scharnhorst class battlecruisers.''

Bullshit.

[acelanceloet]

'' 2 improved scharnhorst class battlecruisers.''

Bullshit.

then what, alex, were the 1047 battlecruiser designs?