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Personal Design - Derry-class CA
http://shipbucket.com/forums/viewtopic.php?f=18&t=8046		 Page 2 of 3
Author:  Hood [ November 7th, 2017, 9:05 am ]
Post subject:  Re: Personal Design - Derry-class CA
I would be tempted to shorten the bows a little. At the moment the ship looks a little unbalanced with a lot of space forward but a very short quarterdeck.
Other than that, it looks a very nice design.
Author:  Colosseum [ November 7th, 2017, 2:34 pm ]
Post subject:  Re: Personal Design - Derry-class CA
Nice work from a new artist - hoping to see more. ;)
Novice wrote: *November 5th, 2017, 7:46 pm
SB style wise first: the credits appear to be not in Arial, or to be slightly larger than they should Ship's name and class usually go on the first line,and artist's name in parentheses like so (Matedow).
The title/credits should read:

USA, Derry Class
USS Derry CA-32 (1922)
(MateDow)

Don't worry about the specific font size - just get it as close as possible.
Author:  matedow [ November 9th, 2017, 10:06 am ]
Post subject:  Re: Personal Design - Derry-class CA
Hood wrote: *November 7th, 2017, 9:05 am
I would be tempted to shorten the bows a little. At the moment the ship looks a little unbalanced with a lot of space forward but a very short quarterdeck.
Other than that, it looks a very nice design.
Here are my thoughts on this. With a long and narrow hull there wouldn't be a lot of buoyancy at the bows where it tapers in. In order to keep the mount #1 as dry as possible it would need to be farther back from the bow that it would on a broader hull. It would also help to keep the moments forcing the bow down into the water balanced as well.

Moving the mount toward the stern combined with the shallow sheer of the bow should have allowed the vessel to fight in a seaway.

I hope that this helps.
Author:  matedow [ November 9th, 2017, 11:15 am ]
Post subject:  Re: Personal Design - Derry-class CA
[ img ]

Created a third edition with some minor changes.
  • Adjusted the credits by removing Karle94's credit, adjusted the font sized, and lined up the credits with the scale.
  • Added a fire control director to the top of the superstructure. (Thank you @Krakatoa for pointing out that omission)
  • Added shading to the underside of the stern in the vicinity of the rudders and propellers.
Author:  matedow [ November 9th, 2017, 2:04 pm ]
Post subject:  Re: Personal Design - Derry-class CA
[ img ]

Mid-life refit for the Derry-class cruisers.
  • Replaced 3"/50 AA guns with 5"/25
  • Widened house amidships to accommodate 5" battery
  • Replaced superstructure and foremast
  • Updated fire control equipment for main battery and AA battery


Displacement:
8,497 t light; 8,864 t standard; 10,626 t normal; 12,036 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(620.50 ft / 609.00 ft) x 65.00 ft x (16.60 / 18.36 ft)
(189.13 m / 185.62 m) x 19.81 m x (5.06 / 5.60 m)

Armament:
5 - 7.00" / 178 mm 45.0 cal guns - 164.99lbs / 74.84kg shells, 220 per gun
Breech loading guns in deck mounts, 1900 Model
4 x Single mounts on centreline ends, evenly spread
2 raised mounts - superfiring
1 x Single mount on centreline, aft deck centre
1 double raised mount aft
4 - 5.00" / 127 mm 25.0 cal guns - 53.86lbs / 24.43kg shells, 450 per gun
Anti-air guns in deck mounts, 1921 Model
4 x Single mounts on sides, forward deck aft
4 raised mounts
Weight of broadside 1,040 lbs / 472 kg
Main Torpedoes
8 - 21.0" / 533 mm, 22.56 ft / 6.88 m torpedoes - 1.442 t each, 11.538 t total
In 2 sets of deck mounted side rotating tubes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3.50" / 89 mm 400.00 ft / 121.92 m 10.00 ft / 3.05 m
Ends: 1.00" / 25 mm 70.00 ft / 21.34 m 10.00 ft / 3.05 m
139.00 ft / 42.37 m Unarmoured ends
Main Belt covers 101 % of normal length

- Armoured deck - single deck:
Fore and Aft decks: 1.50" / 38 mm
Forecastle: 0.25" / 6 mm Quarter deck: 0.50" / 13 mm

- Conning towers: Forward 4.00" / 102 mm, Aft 0.00" / 0 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 79,286 shp / 59,147 Kw = 30.92 kts
Range 12,385nm at 14.00 kts
Bunker at max displacement = 3,172 tons

Complement:
523 - 680

Cost:
£1.365 million / $5.462 million

Distribution of weights at normal displacement:
Armament: 173 tons, 1.6 %
- Guns: 150 tons, 1.4 %
- Weapons: 23 tons, 0.2 %
Armour: 1,322 tons, 12.4 %
- Belts: 604 tons, 5.7 %
- Armour Deck: 676 tons, 6.4 %
- Conning Tower: 42 tons, 0.4 %
Machinery: 2,906 tons, 27.4 %
Hull, fittings & equipment: 3,897 tons, 36.7 %
Fuel, ammunition & stores: 2,129 tons, 20.0 %
Miscellaneous weights: 200 tons, 1.9 %
- Hull below water: 60 tons
- Hull above water: 20 tons
- On freeboard deck: 30 tons
- Above deck: 90 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
17,218 lbs / 7,810 Kg = 100.4 x 7.0 " / 178 mm shells or 1.7 torpedoes
Stability (Unstable if below 1.00): 1.31
Metacentric height 4.2 ft / 1.3 m
Roll period: 13.3 seconds
Steadiness - As gun platform (Average = 50 %): 80 %
- Recoil effect (Restricted arc if above 1.00): 0.15
Seaboat quality (Average = 1.00): 1.38

Hull form characteristics:
Hull has a flush deck,
a straight bulbous bow and a cruiser stern
Block coefficient (normal/deep): 0.566 / 0.580
Length to Beam Ratio: 9.37 : 1
'Natural speed' for length: 24.68 kts
Power going to wave formation at top speed: 55 %
Trim (Max stability = 0, Max steadiness = 100): 58
Bow angle (Positive = bow angles forward): 15.00 degrees
Stern overhang: 4.00 ft / 1.22 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 28.00 ft / 8.53 m, 25.00 ft / 7.62 m
- Forward deck: 40.00 %, 25.00 ft / 7.62 m, 22.00 ft / 6.71 m
- Aft deck: 25.00 %, 22.00 ft / 6.71 m, 20.00 ft / 6.10 m
- Quarter deck: 15.00 %, 20.00 ft / 6.10 m, 21.00 ft / 6.40 m
- Average freeboard: 22.97 ft / 7.00 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 95.3 %
- Above water (accommodation/working, high = better): 225.7 %
Waterplane Area: 28,044 Square feet or 2,605 Square metres
Displacement factor (Displacement / loading): 137 %
Structure weight / hull surface area: 92 lbs/sq ft or 449 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.96
- Longitudinal: 1.43
- Overall: 1.00
Adequate machinery, storage, compartmentation space
Excellent accommodation and workspace room
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily
Author:  Colosseum [ November 9th, 2017, 3:20 pm ]
Post subject:  Re: Personal Design - Derry-class CA
[ img ]

One minor adjustment I'd make to an area that new artists seem to struggle with. Bows of ships generally do not change shape at the waterline.
Author:  matedow [ November 12th, 2017, 2:58 am ]
Post subject:  Re: Personal Design - Derry-class CA
Colosseum wrote: *November 9th, 2017, 3:20 pm
[ img ]

One minor adjustment I'd make to an area that new artists seem to struggle with. Bows of ships generally do not change shape at the waterline.
I will do that and post the results.
Author:  matedow [ November 14th, 2017, 10:41 am ]
Post subject:  Re: Personal Design - Derry-class CA
[ img ]

I have adjusted the bow as @Colosseum suggested, and also added some details to the foremast.

Is there anything that people can see for details that need to be addressed?
Author:  Colosseum [ November 14th, 2017, 3:44 pm ]
Post subject:  Re: Personal Design - Derry-class CA
It's looking good to me. I'd maybe include some more details, like paravanes/booms, boat booms, etc. Maybe look at USN cruiser drawings of a similar era for ideas... the sky's the limit for small details, since you're not drawing a real ship. ;)
Author:  matedow [ November 21st, 2017, 1:51 pm ]
Post subject:  Re: Personal Design - Derry-class CA
Ok, here is the evolution of the Derry-class cruisers through the beginning of the war.


[ img ]


[ img ]


[ img ]

1940 refit for the King Board improvements. Shields for the 7" mounts, 1.1" AA, and 0.5" mg on the foretop.

Displacement:
8,547 t light; 8,929 t standard; 10,690 t normal; 12,100 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(620.48 ft / 609.00 ft) x 65.00 ft x (16.70 / 18.46 ft)
(189.12 m / 185.62 m) x 19.81 m x (5.09 / 5.63 m)

Armament:
5 - 7.00" / 178 mm 45.0 cal guns - 164.99lbs / 74.84kg shells, 220 per gun
Breech loading guns in deck mounts, 1900 Model
4 x Single mounts on centreline ends, evenly spread
2 raised mounts - superfiring
1 x Single mount on centreline, aft deck centre
1 double raised mount aft
4 - 5.00" / 127 mm 25.0 cal guns - 53.86lbs / 24.43kg shells, 450 per gun
Anti-air guns in deck mounts, 1921 Model
4 x Single mounts on sides, forward deck aft
4 raised mounts
16 - 1.10" / 27.9 mm 75.0 cal guns - 0.91lbs / 0.41kg shells, 1,500 per gun
Anti-air guns in deck mounts, 1929 Model
2 x Quad mounts on sides, forward deck centre
2 raised mounts
2 x Quad mounts on sides, aft deck centre
2 raised mounts
4 - 0.50" / 12.7 mm 90.0 cal guns - 0.11lbs / 0.05kg shells, 2,500 per gun
Breech loading guns in deck mounts, 1932 Model
4 x Single mounts on centreline ends, evenly spread
4 double raised mounts
Weight of broadside 1,056 lbs / 479 kg
Main Torpedoes
8 - 21.0" / 533 mm, 22.58 ft / 6.88 m torpedoes - 1.443 t each, 11.548 t total
In 2 sets of deck mounted side rotating tubes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3.50" / 89 mm 400.00 ft / 121.92 m 10.00 ft / 3.05 m
Ends: 1.00" / 25 mm 70.00 ft / 21.34 m 10.00 ft / 3.05 m
139.00 ft / 42.37 m Unarmoured ends
Main Belt covers 101 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
2nd: - 0.25" / 6 mm -
3rd: - 0.25" / 6 mm -

- Armoured deck - single deck:
For and Aft decks: 1.50" / 38 mm
Forecastle: 0.25" / 6 mm Quarter deck: 0.50" / 13 mm

- Conning towers: Forward 4.00" / 102 mm, Aft 0.00" / 0 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 79,286 shp / 59,147 Kw = 30.90 kts
Range 12,346nm at 14.00 kts
Bunker at max displacement = 3,171 tons

Complement:
525 - 683

Cost:
£1.372 million / $5.489 million

Distribution of weights at normal displacement:
Armament: 179 tons, 1.7 %
- Guns: 156 tons, 1.5 %
- Weapons: 23 tons, 0.2 %
Armour: 1,335 tons, 12.5 %
- Belts: 606 tons, 5.7 %
- Armament: 12 tons, 0.1 %
- Armour Deck: 676 tons, 6.3 %
- Conning Tower: 42 tons, 0.4 %
Machinery: 2,906 tons, 27.2 %
Hull, fittings & equipment: 3,876 tons, 36.3 %
Fuel, ammunition & stores: 2,144 tons, 20.1 %
Miscellaneous weights: 250 tons, 2.3 %
- Hull below water: 80 tons
- Hull above water: 20 tons
- On freeboard deck: 40 tons
- Above deck: 110 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
17,141 lbs / 7,775 Kg = 99.9 x 7.0 " / 178 mm shells or 1.7 torpedoes
Stability (Unstable if below 1.00): 1.31
Metacentric height 4.2 ft / 1.3 m
Roll period: 13.3 seconds
Steadiness - As gun platform (Average = 50 %): 80 %
- Recoil effect (Restricted arc if above 1.00): 0.15
Seaboat quality (Average = 1.00): 1.37



Hull form characteristics:
Hull has a flush deck,
a straight bulbous bow and a cruiser stern
Block coefficient (normal/deep): 0.566 / 0.580
Length to Beam Ratio: 9.37 : 1
'Natural speed' for length: 24.68 kts
Power going to wave formation at top speed: 55 %
Trim (Max stability = 0, Max steadiness = 100): 58
Bow angle (Positive = bow angles forward): 15.00 degrees
Stern overhang: 4.00 ft / 1.22 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 27.90 ft / 8.50 m, 24.90 ft / 7.59 m
- Forward deck: 40.00 %, 24.90 ft / 7.59 m, 21.90 ft / 6.68 m
- Aft deck: 25.00 %, 21.90 ft / 6.68 m, 19.90 ft / 6.07 m
- Quarter deck: 15.00 %, 19.90 ft / 6.07 m, 20.90 ft / 6.37 m
- Average freeboard: 22.87 ft / 6.97 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 95.3 %
- Above water (accommodation/working, high = better): 223.8 %
Waterplane Area: 28,044 Square feet or 2,605 Square metres
Displacement factor (Displacement / loading): 136 %
Structure weight / hull surface area: 92 lbs/sq ft or 447 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.96
- Longitudinal: 1.40
- Overall: 1.00
Adequate machinery, storage, compartmentation space
Excellent accommodation and workspace room
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily


[ img ]

Repainted in Measure 5 scheme.
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