WesWorld

Given the remaining tonnage left in the coastal defence catigory Atlantean designers have come up with a design around 6000 tons to maximize the ammount of hulls in this catigory. Should this design be approved it will look something like this:

Escort cruiser design A, Atlantis, Escort cruiser, laid down 1926

Displacement:
5,654 t light; 6,044 t standard; 6,703 t normal; 7,205 t full load
Loading submergence 486 tons/feet

Dimensions:
442.00 ft x 52.00 ft x 16.00 ft (normal load)
134.72 m x 15.85 m x 4.88 m

Armament:
6 - 9.20" / 234 mm guns (3 Main turrets x 2 guns)
8 - 5.50" / 140 mm guns
4 - 3.00" / 76 mm AA guns
12 - 1.00" / 25 mm guns
Weight of broadside 3,062 lbs / 1,389 kg
6 - 21.0" / 533.4 mm above water torpedoes

Armour:
Belt 7.90" / 201 mm, ends unarmoured
Belts cover 68 % of normal area
Main turrets 6.00" / 152 mm, 2nd gun shields 2.00" / 51 mm
Armour deck 4.00" / 102 mm, Conning tower 2.00" / 51 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 12,488 shp / 9,316 Kw = 20.00 kts
Range 10,000nm at 12.00 kts

Complement:
370 - 481

Cost:
£1.988 million / $7.950 million

Distribution of weights at normal displacement:
Armament: 383 tons, 5.7 %
Armour: 2,312 tons, 34.5 %
Belts: 557 tons, 8.3 %, Armament: 481 tons, 7.2 %, Armour Deck: 1,259 tons, 18.8 %
Conning Tower: 15 tons, 0.2 %, Torpedo bulkhead: 0 tons, 0.0 %
Machinery: 400 tons, 6.0 %
Hull, fittings & equipment: 2,510 tons, 37.4 %
Fuel, ammunition & stores: 1,049 tons, 15.7 %
Miscellaneous weights: 50 tons, 0.7 %

Metacentric height 2.2

Remarks:
Hull space for machinery, storage & compartmentation is excellent
Room for accommodation & workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.10
Shellfire needed to sink: 10,123 lbs / 4,592 Kg = 26.0 x 9.2 " / 234 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 2.0
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 71 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.93
Relative quality as seaboat: 1.26

Hull form characteristics:
Block coefficient: 0.638
Sharpness coefficient: 0.39
Hull speed coefficient 'M': 7.17
'Natural speed' for length: 21.02 kts
Power going to wave formation at top speed: 44 %
Trim: 56
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 64.9 %
Relative accommodation and working space: 86.2 %
(Average = 100%)
Displacement factor: 108 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 1.00
(Structure weight / hull surface area: 104 lbs / square foot or 506 Kg / square metre)
Relative longitudinal hull strength: 1.09
(for 12.00 ft / 3.66 m average freeboard, freeboard adjustment -1.98 ft)
Relative composite hull strength: 1.01

Any comments?

While impressive on paper I wonder if it is realistic.

The hull you´re using is similar to the mini-CL TROMP - except for beam.

Can you imagine to put all those guns on a hull the size of a small CL which originally carried 6x15cm and a handful of 4cm and 2cm guns?

What about barbet diameter? You know what I mean... We´re talking 9,2" twins here and with two hoists ect. I´d expect their barbet to have a diameter much larger than 5,3m.

However, as long as spring* defines physics and you can provide a linedrawing that shows positions for her guns - why not? She´s definitively an impressive design on 6kts.

Regards,

HoOmAn

True enough, its interesting to make a design in SS thats beautifull only to find that once you draw it out it turns out to be a lemon! Originally I was toying with a 2x2 ten inch design which evolved to a 2x3-9.5" and then to the current design. The real trick is to get all the cruiser goodies such as scout plane, catipult and flag space on a 6000 ton hull. Even adding 50 tons mich. gave me a headache!

I know what you mean...

The smaller the ship in question the more fun it is to design it and tweak everything into it. ;o)

I think the fact that she is an escort cruiser means that she could afford to lose a twin 9.2" turret in order to gain a more realistic hull form. Having four 9.2" would be nothing to sneeze at when defending a convoy.
Hows this design?

Escort cruiser design B, Atlantis escort cruiser laid down 1926

Displacement:
5,732 t light; 6,043 t standard; 6,702 t normal; 7,202 t full load
Loading submergence 557 tons/feet

Dimensions:
445.00 ft x 64.00 ft x 14.50 ft (normal load)
135.64 m x 19.51 m x 4.42 m

Armament:
4 - 9.20" / 234 mm guns (2 Main turrets x 2 guns)
6 - 5.50" / 140 mm guns
4 - 3.00" / 76 mm AA guns
12 - 1.00" / 25 mm guns
Weight of broadside 2,117 lbs / 960 kg
6 - 21.0" / 533.4 mm above water torpedoes

Armour:
Belt 7.87" / 200 mm, ends unarmoured
Belts cover 60 % of normal area
Main turrets 6.30" / 160 mm, 2nd gun shields 2.00" / 51 mm
Armour deck 4.00" / 102 mm, Conning tower 2.00" / 51 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 12,615 shp / 9,410 Kw = 20.00 kts
Range 10,000nm at 12.00 kts

Complement:
370 - 481

Cost:
£1.656 million / $6.624 million

Distribution of weights at normal displacement:
Armament: 265 tons, 3.9 %
Armour: 2,356 tons, 35.2 %
Belts: 560 tons, 8.4 %, Armament: 338 tons, 5.0 %, Armour Deck: 1,443 tons, 21.5 %
Conning Tower: 15 tons, 0.2 %, Torpedo bulkhead: 0 tons, 0.0 %
Machinery: 404 tons, 6.0 %
Hull, fittings & equipment: 2,608 tons, 38.9 %
Fuel, ammunition & stores: 970 tons, 14.5 %
Miscellaneous weights: 100 tons, 1.5 %

Metacentric height 4.0

Remarks:
Hull space for machinery, storage & compartmentation is excellent
Room for accommodation & workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.29
Shellfire needed to sink: 14,418 lbs / 6,540 Kg = 37.0 x 9.2 " / 234 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 3.1
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 70 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.29
Relative quality as seaboat: 1.21

Hull form characteristics:
Block coefficient: 0.568
Sharpness coefficient: 0.40
Hull speed coefficient 'M': 7.22
'Natural speed' for length: 21.10 kts
Power going to wave formation at top speed: 44 %
Trim: 58
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 52.6 %
Relative accommodation and working space: 103.0 %
(Average = 100%)
Displacement factor: 125 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 1.01
(Structure weight / hull surface area: 102 lbs / square foot or 497 Kg / square metre)
Relative longitudinal hull strength: 1.07
(for 12.00 ft / 3.66 m average freeboard, freeboard adjustment -1.98 ft)
Relative composite hull strength: 1.01

Imperitritsa Maria got 4 triple turrets, mounting 52 caliber 12" guns, on the centerline into 167m length and 27m beam, and her TDS probably limited the space available for her barbets quite a lot.

Put the 140mm and 75mm guns in upper deck casemates, and put the catapult on Q turret, and it all should fit.

I'm a little leary of adding casemates as I'd prefer to take the opertunity to introduse a new 5.5" twin sheilded mount. If I add another 9.2" turret the ship will have to move into the 8000 ton range. In that case I would just produce two ships and build a third ship in my CDS catigory that resembles a proper CDS.

With a 6000 ton ship armed with 9.2" guns, I could produce a significant number of them in a somewhat expendable design that would still pose a significant threat to convoy raiders, if escorted by some older CL's and DD's.