Aztec Ship Designs 1921-1924

[TacCovert4]

I've been trying and trying for a 3000t cruiser, it's just a non-starter for me, probably because I'm not willing to make it slow.  At least it's not going to be in the cards for 1924 which is my next 'cruiser year' in the build program.  The .75 comp will probably be more useful for smaller ships like minesweepers or minelayers.

I think my light ship will wind up being a 'Tribal' class, which I'm aiming towards anyway with my experiments at 8 gun DDs.

My thought with this 'Atlanta-esque' design is a DD leader with the range for trans-oceanic voyages, as well as the protection to stand up in a screen fight and not just get crushed.  The gunnery is aiming for maximum all-round firepower, especially in the chase, as a DD leader would be in the van of a DD force and is more likely to engage in gun duels with other DDs and small cruisers in the chase.

While these wouldn't be good cruisers by themselves, they're role specific.  The all-rounders are my Frigates, and those tend to have 180mm guns and a 100mm secondary.

[Kaiser Kirk]

My Artesmia design I posted is 3000 tons and 31 knots, with a 130mm main armament and just a box around the magazines, but long range.
6 guns fore / 6 aft and 8 on broadside.

Lots of compromises.

In the design notes I mention  "Originally designed for 32 knots and 1.0 seakeeping, this was reduced to 31 to accommodate more fuel and misc weight."
I know I tried one version with 4x 165mm

I rather need long range, both to cover the empire and to allow sustained high speed cruising.

With your more Carrib / Atlantic focus, you could keep the speed and gain the misc weight or armor.

I have some fun working with these tight designs. The big battlewagons you can worst case just add 1000 tons and call it good,
but can't do that with the cruisers or destroyers.

[The Rock Doctor]

I've been trying and trying for a 3000t cruiser, it's just a non-starter for me, probably because I'm not willing to make it slow.  At least it's not going to be in the cards for 1924 which is my next 'cruiser year' in the build program.  The .75 comp will probably be more useful for smaller ships like minesweepers or minelayers.

I think my light ship will wind up being a 'Tribal' class, which I'm aiming towards anyway with my experiments at 8 gun DDs.

My thought with this 'Atlanta-esque' design is a DD leader with the range for trans-oceanic voyages, as well as the protection to stand up in a screen fight and not just get crushed.  The gunnery is aiming for maximum all-round firepower, especially in the chase, as a DD leader would be in the van of a DD force and is more likely to engage in gun duels with other DDs and small cruisers in the chase.

While these wouldn't be good cruisers by themselves, they're role specific.  The all-rounders are my Frigates, and those tend to have 180mm guns and a 100mm secondary.

I had played around with the 3,000 t limit a couple weeks ago and figured about the same thing - even the minelayer I settled on wasn't really much better than 1.5 x 2,000 t minelayers.  So I'm not sure what, if anything, I'll end up doing with that capability.

[Desertfox]

3,000t ships just aren't worth much when you can get almost the same on a 1,500t destroyer. The rules really hurt those small cruisers, especially the fast ones.

[Kaiser Kirk]

My cruiser is somewhat better than a pair of 1500 ton DDs - for me.
The bigger hull should make a better cruiser, and range is far better,
HE can't suddenly detonate the magazine, it carries recon Aircraft,
and it has the same or more armament as both combined, but in armored mounts.
it even had ASW ability. 

It's not greatly better, but has more utility.

I need to explore using the 0.75 for a gunboat style ship, say an Erie class.
But the differential between 0.9 and 0.75 just isn't that much.

[TacCovert4]

The thing with the ultralight cruisers should be for having a dd leader that can survive some hits from dds while dishing out more consistent damage than a dd.

[Kaiser Kirk]

What's interesting is looking at Wiki's write up for the Yubari class.
It's about the right time line for being the source of the rule - 1920 tech, finishes 1922-23.
Ship laid down 1922.

Probably 2500 tons light,
2x 2T140 M&H,
2x 1x140 P
only 4 torpedoes
Belt of 38mm, deck of 28mm.
only 5,000nm at 14knts
Ran trials, I believe Japanese practice was stripped down. Not in fighting condition.
I don't think they did the Italian thing of apparently doing it pre-weapons.

Still wound up 419 tons over - about 16%, drew extra water and was 1.5kts
slower than designed.
Then they had to add ballast because she was not stable.
No indications on wiki how that effected speed.
edit : guessing the actual displacement wound up being close to 3000 light :)

Actually wound up absorbing a fair bit of damage successfully.

But a very limited and lightly protected ship.

[TacCovert4]

Yeah, I'm going to try to aim at Yubari for my next attempt at a 1920 cruiser tech cruiser.  Though I might look at sacrificing the torpedoes entirely for a gun cruiser or something.  Maybe just do a magazine box in exchange for an extra twin mount of the 130s.

[Desertfox]

My cruiser is somewhat better than a pair of 1500 ton DDs - for me.
The bigger hull should make a better cruiser, and range is far better,
HE can't suddenly detonate the magazine, it carries recon Aircraft,
and it has the same or more armament as both combined, but in armored mounts.
it even had ASW ability. 

It's not greatly better, but has more utility.

I need to explore using the 0.75 for a gunboat style ship, say an Erie class.
But the differential between 0.9 and 0.75 just isn't that much.

Your cruiser is also under 40% machinery just like my 3-4k cruisers. If you try to push speed where you are getting close or over 50% machinery, that's where the differences starts being very apparent.

[Kaiser Kirk]

True, if you push machinery tonnage to the point it qualifies as an overlarge destroyer, then the .75 vs the .50 will not help you.
Also that higher machinery % is why the damage allowed on destroyers is so miserable.
Particularly with the larger QF guns we're mounting, they will not take hits well at all.

But I'm not trying to make a giant destroyer with these.
Go a little slower (actually about the same as my DDs without the boost)
with more firepower, range, utility and damage absorption than 2 of my DDs.

If I do go with a gunboat or escort vessel version I can bring the speed down slightly- not an option on DDs
and put more into the guns/armor/utility side of things.

[TacCovert4]

Yeah.  I'm thinking that the screaming fast speeds on my larger cruisers are a lot tougher to get on a 3000 tonner.  One reason is that we can't use transoms which would be common on dds and small cruisers in the time period.

I'll probably look more at a 29-30kt design and see what I can make tonight.

[TacCovert4]

Looking at the ships the Sultanate has in colonial roles, there are two things that are obvious:
1)  All of the colonial cruisers, with the exception of the one-off Penguin class ice-capable cruisers, are the oldest ships in the fleet without an extant demobilization plan.
2)  All of the colonial cruisers have old armor schemes without belts, poorly armored or even placed gun schemes
3)  No AA suite
4)  No ASW suite
5)  100mm guns when those are even getting light for fleet destroyers
6)  Either fast but poorly armed and protected, or slow.

With these factors in mind, for 1923 there's a push to replace these 15 year or older designs with a modern and well designed colonial cruiser with modern guns, fire control, anti air defenses, and even ASW, as destroyers are a type highly desired by the fleet as fast as they can be produced.  A cruiser is preferred to a destroyer as it gives more status, and has somewhat more staying power both in seaways and in a fight.  A destroyer is not a suitable ship to flag a foreign station after all.  Given the push to begin a more rapid production schedule of capital ships and larger cruisers, and the constant need for destroyers in larger quantities, a program that can produce a suitable small cruiser for colonial stationkeeping duties within a single calendar year is highly desirable for not disrupting current building plans.

Two designs have been put forward:

Salado (River-class), Aztec Corvette laid down 1923

Displacement:
   2,999 t light; 3,128 t standard; 3,786 t normal; 4,312 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (415.38 ft / 410.11 ft) x 45.93 ft x (13.12 / 14.54 ft)
   (126.61 m / 125.00 m) x 14.00 m  x (4.00 / 4.43 m)

Armament:
      6 - 5.12" / 130 mm 50.0 cal guns - 70.97lbs / 32.19kg shells, 200 per gun
     Quick firing guns in deck and hoist mounts, 1923 Model
     3 x Twin mounts on centreline ends, majority forward
      1 raised mount - superfiring
      1 - 2.76" / 70.0 mm 50.0 cal gun - 11.08lbs / 5.03kg shells, 300 per gun
     Anti-air gun in deck mount, 1923 Model
     1 x Single mount on centreline, aft deck centre
      1 raised mount
      8 - 1.18" / 30.0 mm 50.0 cal guns - 0.87lbs / 0.40kg shells, 1,000 per gun
     Anti-air guns in deck and hoist mounts, 1923 Model
     4 x Twin mounts on sides, forward evenly spread
      8 - 0.47" / 12.0 mm 50.0 cal guns - 0.06lbs / 0.03kg shells, 2,000 per gun
     Machine guns in deck mounts, 1923 Model
     8 x Single mounts on sides, evenly spread
      Weight of broadside 444 lbs / 202 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   1.97" / 50 mm   285.43 ft / 87.00 m   9.84 ft / 3.00 m
   Ends:   Unarmoured
     Main Belt covers 107 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.97" / 50 mm   1.38" / 35 mm      1.57" / 40 mm
   3rd:         -      0.79" / 20 mm      0.79" / 20 mm

   - Protected deck - single deck:
   For and Aft decks: 1.65" / 42 mm

   - Conning towers: Forward 1.97" / 50 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 32,708 shp / 24,400 Kw = 28.00 kts
   Range 10,000nm at 14.00 kts
   Bunker at max displacement = 1,184 tons

Complement:
   240 - 313

Cost:
   £0.887 million / $3.549 million

Distribution of weights at normal displacement:
   Armament: 108 tons, 2.8 %
      - Guns: 108 tons, 2.8 %
   Armour: 614 tons, 16.2 %
      - Belts: 227 tons, 6.0 %
      - Armament: 51 tons, 1.3 %
      - Armour Deck: 326 tons, 8.6 %
      - Conning Tower: 10 tons, 0.3 %
   Machinery: 1,093 tons, 28.9 %
   Hull, fittings & equipment: 1,077 tons, 28.5 %
   Fuel, ammunition & stores: 787 tons, 20.8 %
   Miscellaneous weights: 106 tons, 2.8 %
      - Hull below water: 5 tons
      - Hull above water: 7 tons
      - On freeboard deck: 36 tons
      - Above deck: 58 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     3,559 lbs / 1,614 Kg = 53.1 x 5.1 " / 130 mm shells or 0.9 torpedoes
   Stability (Unstable if below 1.00): 1.22
   Metacentric height 2.2 ft / 0.7 m
   Roll period: 12.9 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.31
   Seaboat quality  (Average = 1.00): 1.11

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.536 / 0.551
   Length to Beam Ratio: 8.93 : 1
   'Natural speed' for length: 20.25 kts
   Power going to wave formation at top speed: 60 %
   Trim (Max stability = 0, Max steadiness = 100): 63
   Bow angle (Positive = bow angles forward): 15.00 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 %,  19.69 ft / 6.00 m,  18.04 ft / 5.50 m
      - Forward deck:   30.00 %,  18.04 ft / 5.50 m,  15.09 ft / 4.60 m
      - Aft deck:   35.00 %,  15.09 ft / 4.60 m,  15.09 ft / 4.60 m
      - Quarter deck:   15.00 %,  15.09 ft / 4.60 m,  15.09 ft / 4.60 m
      - Average freeboard:      16.26 ft / 4.95 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 106.2 %
      - Above water (accommodation/working, high = better): 162.4 %
   Waterplane Area: 12,975 Square feet or 1,205 Square metres
   Displacement factor (Displacement / loading): 113 %
   Structure weight / hull surface area: 55 lbs/sq ft or 266 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.71
      - Longitudinal: 1.30
      - Overall: 0.75
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

25t - LR Radio
25t - NF Devices 1918
15t - 1918 FC

5t - Basic Hydrophones

24t - 2 x 3 x 21in HW TT
12t - Depth Charges

AND

Salado (River-class), Aztec Corvette laid down 1923

Displacement:
   3,000 t light; 3,147 t standard; 3,807 t normal; 4,336 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (418.66 ft / 413.39 ft) x 45.93 ft x (13.12 / 14.54 ft)
   (127.61 m / 126.00 m) x 14.00 m  x (4.00 / 4.43 m)

Armament:
      8 - 5.12" / 130 mm 50.0 cal guns - 70.97lbs / 32.19kg shells, 200 per gun
     Quick firing guns in deck and hoist mounts, 1923 Model
     4 x Twin mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      2 - 2.76" / 70.0 mm 50.0 cal guns - 11.08lbs / 5.03kg shells, 300 per gun
     Anti-air guns in deck mounts, 1923 Model
     2 x Single mounts on centreline, evenly spread
      2 raised mounts
      8 - 1.18" / 30.0 mm 50.0 cal guns - 0.87lbs / 0.40kg shells, 1,000 per gun
     Anti-air guns in deck and hoist mounts, 1923 Model
     4 x Twin mounts on sides, forward evenly spread
      8 - 0.47" / 12.0 mm 50.0 cal guns - 0.06lbs / 0.03kg shells, 2,000 per gun
     Machine guns in deck mounts, 1923 Model
     8 x Single mounts on sides, evenly spread
      Weight of broadside 597 lbs / 271 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.97" / 50 mm   1.38" / 35 mm      1.57" / 40 mm
   3rd:         -      0.79" / 20 mm      0.79" / 20 mm

   - Box over machinery & magazines:
   1.57" / 40 mm

   - Conning towers: Forward 1.57" / 40 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 32,641 shp / 24,350 Kw = 28.00 kts
   Range 10,000nm at 14.00 kts
   Bunker at max displacement = 1,188 tons

Complement:
   242 - 315

Cost:
   £0.932 million / $3.728 million

Distribution of weights at normal displacement:
   Armament: 144 tons, 3.8 %
      - Guns: 144 tons, 3.8 %
   Armour: 544 tons, 14.3 %
      - Armament: 62 tons, 1.6 %
      - Armour Deck: 474 tons, 12.5 %
      - Conning Tower: 8 tons, 0.2 %
   Machinery: 1,091 tons, 28.7 %
   Hull, fittings & equipment: 1,115 tons, 29.3 %
   Fuel, ammunition & stores: 807 tons, 21.2 %
   Miscellaneous weights: 106 tons, 2.8 %
      - Hull below water: 5 tons
      - Hull above water: 7 tons
      - On freeboard deck: 36 tons
      - Above deck: 58 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     3,312 lbs / 1,502 Kg = 49.4 x 5.1 " / 130 mm shells or 0.9 torpedoes
   Stability (Unstable if below 1.00): 1.17
   Metacentric height 2.1 ft / 0.6 m
   Roll period: 13.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.46
   Seaboat quality  (Average = 1.00): 1.09

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.535 / 0.550
   Length to Beam Ratio: 9.00 : 1
   'Natural speed' for length: 20.33 kts
   Power going to wave formation at top speed: 60 %
   Trim (Max stability = 0, Max steadiness = 100): 64
   Bow angle (Positive = bow angles forward): 15.00 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 %,  19.69 ft / 6.00 m,  18.04 ft / 5.50 m
      - Forward deck:   30.00 %,  18.04 ft / 5.50 m,  15.09 ft / 4.60 m
      - Aft deck:   35.00 %,  15.09 ft / 4.60 m,  15.09 ft / 4.60 m
      - Quarter deck:   15.00 %,  15.09 ft / 4.60 m,  15.09 ft / 4.60 m
      - Average freeboard:      16.26 ft / 4.95 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 109.2 %
      - Above water (accommodation/working, high = better): 162.2 %
   Waterplane Area: 13,064 Square feet or 1,214 Square metres
   Displacement factor (Displacement / loading): 111 %
   Structure weight / hull surface area: 57 lbs/sq ft or 277 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.71
      - Longitudinal: 1.29
      - Overall: 0.75
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

25t - LR Radio
25t - NF Devices 1918
15t - 1918 FC

5t - Basic Hydrophones

24t - 2 x 3 x 21in HW TT
12t - Depth Charges

[The Rock Doctor]

I think the first design is better balanced for the role, though I'd not provide it with an ASW role. 

Have you considered decreasing the deck armor a bit and squeezing in a bit of flag facilities (~50 t)?

[TacCovert4]

I think the first design is better balanced for the role, though I'd not provide it with an ASW role. 

Have you considered decreasing the deck armor a bit and squeezing in a bit of flag facilities (~50 t)?

I might pull the ASW suite in favor of colonial flag facilities, really just a somewhat expanded bridge space and a couple extra staterooms, on the same tonnage.

The deck armor is meant to be able to resist splinters from 240mm guns, as this type of ship might be subject to some long range fires from a larger cruiser as it's trying to duck and weave, so that's something I'm trying to do with that. 

[TacCovert4]

Another issue at play is replacing the very obsolete Scimitar-class Destroyers.  Two designs have been put forward, one a GTB-style under GTB-V-class. 

GTB-V, Aztec Torpedo Boat laid down 1923

Displacement:
   532 t light; 551 t standard; 620 t normal; 675 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (319.38 ft / 314.96 ft) x 26.25 ft x (6.56 / 6.94 ft)
   (97.35 m / 96.00 m) x 8.00 m  x (2.00 / 2.12 m)

Armament:
      2 - 3.94" / 100 mm 50.0 cal guns - 32.30lbs / 14.65kg shells, 150 per gun
     Quick firing guns in deck mount, 1923 Model
     1 x Twin mount on centreline, forward deck centre
      4 - 1.18" / 30.0 mm 50.0 cal guns - 0.87lbs / 0.40kg shells, 1,000 per gun
     Anti-air guns in deck mounts, 1923 Model
     4 x Single mounts on sides, evenly spread
      Weight of broadside 68 lbs / 31 kg

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 17,034 shp / 12,708 Kw = 31.40 kts
   Range 3,000nm at 14.00 kts
   Bunker at max displacement = 124 tons

Complement:
   61 - 80

Cost:
   £0.196 million / $0.783 million

Distribution of weights at normal displacement:
   Armament: 12 tons, 1.9 %
      - Guns: 12 tons, 1.9 %
   Machinery: 320 tons, 51.7 %
   Hull, fittings & equipment: 179 tons, 28.9 %
   Fuel, ammunition & stores: 88 tons, 14.3 %
   Miscellaneous weights: 20 tons, 3.2 %
      - On freeboard deck: 18 tons
      - Above deck: 2 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     179 lbs / 81 Kg = 5.9 x 3.9 " / 100 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.09
   Metacentric height 0.8 ft / 0.2 m
   Roll period: 12.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 68 %
         - Recoil effect (Restricted arc if above 1.00): 0.14
   Seaboat quality  (Average = 1.00): 0.76

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.400 / 0.412
   Length to Beam Ratio: 12.00 : 1
   'Natural speed' for length: 17.75 kts
   Power going to wave formation at top speed: 63 %
   Trim (Max stability = 0, Max steadiness = 100): 89
   Bow angle (Positive = bow angles forward): 20.00 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 %,  12.14 ft / 3.70 m,  10.83 ft / 3.30 m
      - Forward deck:   30.00 %,  10.83 ft / 3.30 m,  10.83 ft / 3.30 m
      - Aft deck:   35.00 %,  8.20 ft / 2.50 m,  8.20 ft / 2.50 m
      - Quarter deck:   15.00 %,  8.20 ft / 2.50 m,  8.20 ft / 2.50 m
      - Average freeboard:      9.62 ft / 2.93 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 173.3 %
      - Above water (accommodation/working, high = better): 149.6 %
   Waterplane Area: 5,089 Square feet or 473 Square metres
   Displacement factor (Displacement / loading): 52 %
   Structure weight / hull surface area: 23 lbs/sq ft or 110 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 0.75
      - Overall: 0.52
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

18t - 2 x 3 x 21in HW TT
2t - 1918 FC


And a second, a small general purpose destroyer, more of an escort and torpedo ship than the larger fleet boats that have been built over the last several years.

H-Class, Aztec Destroyer laid down 1923

Displacement:
   868 t light; 907 t standard; 1,030 t normal; 1,129 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (303.93 ft / 298.56 ft) x 27.89 ft x (9.02 / 9.66 ft)
   (92.64 m / 91.00 m) x 8.50 m  x (2.75 / 2.94 m)

Armament:
      4 - 3.94" / 100 mm 50.0 cal guns - 32.30lbs / 14.65kg shells, 200 per gun
     Quick firing guns in deck mounts, 1923 Model
     2 x Twin mounts on centreline ends, evenly spread
      6 - 1.18" / 30.0 mm 50.0 cal guns - 0.87lbs / 0.40kg shells, 1,000 per gun
     Anti-air guns in deck mounts, 1923 Model
     6 x Single mounts on sides, evenly spread
      8 - 0.47" / 12.0 mm 70.0 cal guns - 0.06lbs / 0.03kg shells, 2,000 per gun
     Machine guns in deck mounts, 1923 Model
     4 x Twin mounts on sides, evenly spread
      Weight of broadside 135 lbs / 61 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.06" / 27 mm         -               -

   - Conning towers: Forward 1.06" / 27 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 24,566 shp / 18,326 Kw = 31.00 kts
   Range 4,000nm at 14.00 kts
   Bunker at max displacement = 222 tons

Complement:
   90 - 118

Cost:
   £0.329 million / $1.315 million

Distribution of weights at normal displacement:
   Armament: 24 tons, 2.3 %
      - Guns: 24 tons, 2.3 %
   Armour: 7 tons, 0.7 %
      - Armament: 5 tons, 0.5 %
      - Conning Tower: 2 tons, 0.2 %
   Machinery: 536 tons, 52.0 %
   Hull, fittings & equipment: 260 tons, 25.2 %
   Fuel, ammunition & stores: 162 tons, 15.7 %
   Miscellaneous weights: 42 tons, 4.1 %
      - Hull below water: 5 tons
      - On freeboard deck: 34 tons
      - Above deck: 3 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     277 lbs / 126 Kg = 9.1 x 3.9 " / 100 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.16
   Metacentric height 1.0 ft / 0.3 m
   Roll period: 11.9 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.23
   Seaboat quality  (Average = 1.00): 0.90

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.480 / 0.491
   Length to Beam Ratio: 10.71 : 1
   'Natural speed' for length: 17.28 kts
   Power going to wave formation at top speed: 69 %
   Trim (Max stability = 0, Max steadiness = 100): 78
   Bow angle (Positive = bow angles forward): 20.00 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 %,  14.76 ft / 4.50 m,  13.12 ft / 4.00 m
      - Forward deck:   30.00 %,  13.12 ft / 4.00 m,  11.48 ft / 3.50 m
      - Aft deck:   35.00 %,  11.48 ft / 3.50 m,  11.48 ft / 3.50 m
      - Quarter deck:   15.00 %,  11.48 ft / 3.50 m,  11.48 ft / 3.50 m
      - Average freeboard:      12.19 ft / 3.72 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 176.4 %
      - Above water (accommodation/working, high = better): 136.8 %
   Waterplane Area: 5,449 Square feet or 506 Square metres
   Displacement factor (Displacement / loading): 58 %
   Structure weight / hull surface area: 26 lbs/sq ft or 127 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.59
      - Overall: 0.56
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

24t - 2 x 3 x 21in HW TT Centerline
5t - Hydrophones
10t - 50 Depth Charges