Large Destroyers

[mentat]

My thoughts on Large Destroyer designs.

Not easy to pack in sufficient firepower with the 1500 ton limit.

I've gone for 5.1" (70lbs) (in common with the Lt Scouting Cruiser design) as offering the best balance of topside wt vs. firepower against opposing TBDs - and hopefully still OK on stability and seakeeping.

Given shell size I have included hoists - seems essential even for single mounts

Seakeeping score is measured at 31 knots - rapidly improves at more practical speeds

I'm not convinced going over 31 knots design speed is really worthwhile - such small ships can only go max. speed in favourable light sea conditions and going for more engine power to achieve over 31 knots seems to involve too much sacrifice vs. firepower - at least at 1500 tons - actually would have liked to use 1800 - 2000+ tons for the 2 large designs - but not allowed,  so ...

  - ? Discuss ??


Family of designs includes:

DL - Destroyer Leader: 1500t Lt  6 x 5.1" (2x2, 2x1) 6 x 21"TT 31 knots

DD(L) - Large Destroyer: 1500t Lt  5 x 5.1" (5 x 1) 8 x 21" TT 31.4 knots

DD - Standard Destroyer: 1300t Lt  4 x 5.1" (4 x 1) 6 x 21" TT 31 knots

- and:

DE - Destroyer Escort:  800t Lt  4 x 4"  4 x TT  28 knots

CTB - (Large) Coastal Torpedo Boat: 800t Lt 3 x 4" 6 x 21" TT 32 knots (but shorter range)

For fun I have included a 6 x 0.33" gatling style 'mini-gun' - for very close in work and repelling boarders !!

Rationale of the various types:

Flotilla Leader - speaks for itself

Large Destroyer - only need in small nos. - operate with the Battlecruisers, look flash, impress the neighbours etc

Standard - need lots of these

Escort Destroyer - cheap utility version, good for most things and 28 knots means can still operate with the main fleet if required

Large Coastal TBD - the attack component in Coastal defence force and capable of routine patrol/escort too

Here are the specs:

Nile, BAE Battle Class - Destroyer Leader laid down 1916

Displacement:
1,463 t light; 1,544 t standard; 1,795 t normal; 1,996 t full load

Dimensions: Length overall / water x beam x draught
395.97 ft / 385.00 ft x 34.00 ft x 12.00 ft (normal load)
120.69 m / 117.35 m x 10.36 m  x 3.66 m

Armament:
      6 - 5.10" / 130 mm guns (4 mounts), 70.00lbs / 31.75kg shells, 1916 Model
   Breech loading guns in deck mounts with hoists
  on centreline ends, evenly spread, 2 raised mounts - superfiring
      2 - 2.56" / 65.0 mm guns in single mounts, 8.50lbs / 3.86kg shells, 1916 Model
   Quick firing guns in deck mounts
  on side, evenly spread, all raised mounts
      6 - 1.00" / 25.4 mm guns (3x2 guns), 0.50lbs / 0.23kg shells, 1916 Model
   Machine guns in deck mounts
  on side, evenly spread, all raised mounts
      12 - 0.33" / 8.4 mm guns (2x6 guns), 0.02lbs / 0.01kg shells, 1916 Model
  Machine guns in deck mounts
   on side, evenly spread, all raised mounts
Weight of broadside 440 lbs / 200 kg
Shells per gun, main battery: 180
6 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.50" / 38 mm 1.00" / 25 mm       -\
3rd: 0.40" / 10 mm       -\       
4th: 0.40" / 10 mm       -\

   - Conning tower: 1.50" / 38 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 28,742 shp / 21,442 Kw = 31.00 kts
Range 7,000nm at 12.00 kts
Bunker at max displacement = 452 tons

Complement:
137 - 179

Cost:
'a30.346 million / $1.382 million

Distribution of weights at normal displacement:
Armament: 52 tons, 2.9 %
Armour: 35 tons, 1.9 %
    - Belts: 0 tons, 0.0 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 30 tons, 1.7 %
    - Armour Deck: 0 tons, 0.0 %
    - Conning Tower: 5 tons, 0.3 %
Machinery: 829 tons, 46.2 %
Hull, fittings & equipment: 467 tons, 26.0 %
Fuel, ammunition & stores: 332 tons, 18.5 %
Miscellaneous weights: 80 tons, 4.5 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship):
   380 lbs / 172 Kg = 5.7 x 5.1 " / 130 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 1.2 ft / 0.4 m
Roll period: 12.9 seconds
Steadiness - As gun platform (Average = 50 %): 75 %
- Recoil effect (Restricted arc if above 1.00): 0.79
Seaboat quality  (Average = 1.00): 0.97

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.400
Length to Beam Ratio: 11.32 : 1
'Natural speed' for length: 19.62 kts
Power going to wave formation at top speed: 59 %
Trim (Max stability = 0, Max steadiness = 100): 77
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
    - Stem: 19.00 ft / 5.79 m
    - Forecastle (20 %): 16.00 ft / 4.88 m
    - Mid (45 %): 16.00 ft / 4.88 m (9.00 ft / 2.74 m aft of break)
    - Quarterdeck (15 %): 9.00 ft / 2.74 m
    - Stern: 9.00 ft / 2.74 m
    - Average freeboard: 12.39 ft / 3.78 m
Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 176.8 %
- Above water (accommodation/working, high = better): 89.6 %
Waterplane Area: 8,058 Square feet or 749 Square metres
Displacement factor (Displacement / loading): 67 %
Structure weight / hull surface area: 33 lbs/sq ft or 162 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.47
- Longitudinal: 0.82
- Overall: 0.50

Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform
Poor seaboat, wet and uncomfortable, reduced performance in heavy weather



Large Destroyer:


Broadsword, BAE Large Destroyer laid down 1916

Displacement:
1,470 t light; 1,544 t standard; 1,795 t normal; 1,996 t full load

Dimensions: Length overall / water x beam x draught
395.97 ft / 385.00 ft x 34.00 ft x 12.00 ft (normal load)
120.69 m / 117.35 m x 10.36 m  x 3.66 m

Armament:
      5 - 5.10" / 130 mm guns in single mounts, 70.00lbs / 31.75kg shells, 1916 Model
   Breech loading guns in deck mounts with hoists
   on centreline ends, majority forward, 3 raised mounts - superfiring
      2 - 2.56" / 65.0 mm guns in single mounts, 8.50lbs / 3.86kg shells, 1916 Model
   Quick firing guns in deck mounts
   on side, evenly spread, all raised mounts
      6 - 1.00" / 25.4 mm guns (3x2 guns), 0.50lbs / 0.23kg shells, 1916 Model
   Machine guns in deck mounts
   on side, evenly spread, all raised mounts
      12 - 0.33" / 8.4 mm guns (2x6 guns), 0.02lbs / 0.01kg shells, 1916 Model
   Machine guns in deck mounts
   on side, evenly spread, all raised mounts
Weight of broadside 370 lbs / 168 kg
Shells per gun, main battery: 180
8 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.50" / 38 mm\ 1.00" / 25 mm       -
3rd: 0.40" / 10 mm       -      -
4th: 0.40" / 10 mm       -       -

   - Conning tower: 1.50" / 38 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 30,371 shp / 22,657 Kw = 31.42 kts
Range 7,000nm at 12.00 kts
Bunker at max displacement = 452 tons

Complement:
137 - 179

Cost:
'a30.343 million / $1.374 million

Distribution of weights at normal displacement:
Armament: 44 tons, 2.4 %
Armour: 30 tons, 1.7 %
    - Belts: 0 tons, 0.0 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 25 tons, 1.4 %
    - Armour Deck: 0 tons, 0.0 %
    - Conning Tower: 5 tons, 0.3 %
Machinery: 868 tons, 48.4 %
Hull, fittings & equipment: 458 tons, 25.5 %
Fuel, ammunition & stores: 325 tons, 18.1 %
Miscellaneous weights: 70 tons, 3.9 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
   376 lbs / 171 Kg = 5.7 x 5.1 " / 130 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.15
Metacentric height 1.3 ft / 0.4 m
Roll period: 12.6 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.66
Seaboat quality  (Average = 1.00): 0.95

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.400
Length to Beam Ratio: 11.32 : 1
'Natural speed' for length: 19.62 kts
Power going to wave formation at top speed: 60 %
Trim (Max stability = 0, Max steadiness = 100): 74
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
    - Stem: 19.00 ft / 5.79 m
    - Forecastle (20 %): 16.00 ft / 4.88 m
    - Mid (45 %): 16.00 ft / 4.88 m (9.00 ft / 2.74 m aft of break)
    - Quarterdeck (15 %): 9.00 ft / 2.74 m
    - Stern: 9.00 ft / 2.74 m
    - Average freeboard: 12.39 ft / 3.78 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 179.5 %
- Above water (accommodation/working, high = better): 75.8 %
Waterplane Area: 8,058 Square feet or 749 Square metres
Displacement factor (Displacement / loading): 66 %
Structure weight / hull surface area: 33 lbs/sq ft or 159 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.48
- Longitudinal: 0.81
- Overall: 0.50

Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform
Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

Gun layout (5 x 1) - is as the famous French Contre-torpilleurs: A (B) ----- (Q) (X) Y

This one (in case of NEDS, but may be OK) also raises the idea of a twin TT mounted a bit higher than (and parially overlapping with) 2 adjacent triples in a superfiring position - I can't actually see any reason why not - but I'm sure views may vary on this ...


Well I think these 2 hit the 'sweet spot' - now if that doesn't prompt discussion (derision ??) -  nothing will ... 

Will post the smaller design specs later.

[The Rock Doctor]

I must point out that the cross-sectional hull strength must be 0.50 or better, not just the overall strength.

I'll be interested in seeing the escort concept, but have generally taken the view that this is what one uses one's older destroyers for...

[mentat]

Thanks for reply - I'll tweak those 2 to meet the reqmt.

This is the Escort version - yes Old DDs are very useful - but I think these can fill a bit of a gap between old destroyers (esp. if you don't have enough/ they are getting clapped out) and latest top spec. DDs

In particular:

- Escort Leader for Convoy/Small task group - poss. more reliable, more modern commns

- more capable/reliable in operating with the Fleet

Also - useful to have a current design that can be quickly repeated in case of trade threat /war happening

Here's the Spec.  - tweaked to get the C/S strength reqmt:



Whitby, BAE Port Class - Destroyer Escort  laid down 1916

Displacement:
827 t light; 863 t standard; 1,042 t normal; 1,186 t full load

Dimensions: Length overall / water x beam x draught
310.97 ft / 300.00 ft x 28.00 ft x 11.25 ft (normal load)
94.78 m / 91.44 m x 8.53 m  x 3.43 m

Armament:
      4 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1916 Mode
   Breech loading guns in deck mounts with hoists
   on centreline ends, evenly spread, 2 raised mounts - superfiring
      2 - 2.56" / 65.0 mm guns in single mounts, 8.50lbs / 3.86kg shells, 1916 Model
   Quick firing guns in deck mounts
   on side, all amidships, all raised mounts - superfiring
      4 - 1.00" / 25.4 mm guns (2x2 guns), 0.50lbs / 0.23kg shells, 1916 Model
   Machine guns in deck mounts
   on side, evenly spread, all raised mounts
      12 - 0.33" / 8.4 mm guns (2x6 guns), 0.02lbs / 0.01kg shells, 1916 Model
   Machine guns in deck mounts
   on side, evenly spread, all raised mounts
Weight of broadside 147 lbs / 67 kg
Shells per gun, main battery: 180
4 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.00" / 25 mm 0.60" / 15 mm      -
3rd: 0.40" / 10 mm       -       -
4th: 0.40" / 10 mm       -       -

   - Conning tower: 1.50" / 38 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 15,170 shp / 11,317 Kw = 28.00 kts
Range 7,000nm at 12.00 kts
Bunker at max displacement = 322 tons

Complement:
91 - 119

Cost:
  £0.179 million / $0.717 million

Distribution of weights at normal displacement:
Armament: 18 tons, 1.8 %
Armour: 13 tons, 1.3 %
    - Belts: 0 tons, 0.0 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 10 tons, 1.0 %
    - Armour Deck: 0 tons, 0.0 %
    - Conning Tower: 3 tons, 0.3 %
Machinery: 466 tons, 44.7 %
Hull, fittings & equipment: 289 tons, 27.7 %
Fuel, ammunition & stores: 216 tons, 20.7 %
Miscellaneous weights: 40 tons, 3.8 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
   321 lbs / 146 Kg = 10.0 x 4.0 " / 102 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.25
Metacentric height 1.1 ft / 0.3 m
Roll period: 11.2 seconds
Steadiness - As gun platform (Average = 50 %): 75 %
- Recoil effect (Restricted arc if above 1.00): 0.49
Seaboat quality  (Average = 1.00): 1.29

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.386
Length to Beam Ratio: 10.71 : 1
'Natural speed' for length: 17.32 kts
Power going to wave formation at top speed: 60 %
Trim (Max stability = 0, Max steadiness = 100): 58
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
    - Stem: 19.00 ft / 5.79 m
    - Forecastle (20 %): 15.50 ft / 4.72 m
    - Mid (45 %): 15.50 ft / 4.72 m (8.50 ft / 2.59 m aft of break)
    - Quarterdeck (15 %): 8.50 ft / 2.59 m
   - Stern: 8.50 ft / 2.59 m
    - Average freeboard: 11.93 ft / 3.64 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 162.4 %
- Above water (accommodation/working, high = better): 80.8 %
Waterplane Area: 5,134 Square feet or 477 Square metres
Displacement factor (Displacement / loading): 78 %
Structure weight / hull surface area: 28 lbs/sq ft or 136 Kg/sq metre
Hull strength (Relative):
  - Cross-sectional: 0.50
- Longitudinal: 1.67
- Overall: 0.56

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

I think it's quite handy and reasonably cheap. Hopefully, Captain Cook would have been happy to sail in her ... :)

[Carthaginian]

Right now, we're limited by two things:1.) the inability to pack larger guns, longer ranges and higher speeds on a destroyer AND 2.) the images of Fletcher, Fabuki and Fantasque racing through our minds at nearly 40 knots that make us want to try to do all three on the same boat.

I like ships like yours- strong enough, reliable enough, and relatively cheap to build.

[mentat]

Thanks - glad you like them.

My favourites are the French Contre Torpilleurs - Le Tigre etc and the RN Battle Class - both are beauties

Hopefully - there will be some shift in the rules for subsequent years - with everyone champing at the bit - Super Destroyers are even sexier than BCs and a lot cheaper too !!

At the moment I guess there is effectively a 'dead zone' from 1500 - 3000 tons? - which doesn't seem right

With an 'armament cap' of say 4 x 'up to 6 inch ' or '6 x up to 5.5 inch ' or '8 x up to 5.1 inch ' - and possibly a hull strength reqmt of 0.7 - everyone could have as much fun as they liked/could afford up to 2500-3000 tons .....

- up to 2000 tons I'd use it for better sea-keeping after that a bit more firepower

[mentat]

Here's the revised version of the Large Destroyer - Broadsword  - now that's a name for a Destroyer!!  ;D

- which was closest to the 1500 ton limit - needed a few tweakings on dimensions and a tiny slither off the range - otherwise quite intact:


Broadsword, BAE Large Destroyer laid down 1916

Displacement:
1,494 t light; 1,569 t standard; 1,812 t normal; 2,006 t full load

Dimensions: Length overall / water x beam x draught
380.97 ft / 370.00 ft x 34.00 ft x 12.60 ft (normal load)
116.12 m / 112.78 m x 10.36 m  x 3.84 m

Armament:
      5 - 5.10" / 130 mm guns in single mounts, 70.00lbs / 31.75kg shells, 1916 Model
   Breech loading guns in deck mounts with hoists
   on centreline ends, majority forward, 2 raised mounts - superfiring
      2 - 2.56" / 65.0 mm guns in single mounts, 8.50lbs / 3.86kg shells, 1916 Model
   Quick firing guns in deck mounts
   on side, evenly spread, all raised mounts
      6 - 1.00" / 25.4 mm guns (3x2 guns), 0.50lbs / 0.23kg shells, 1916 Model
   Machine guns in deck mounts
   on side, evenly spread, all raised mounts
      12 - 0.33" / 8.4 mm guns (2x6 guns), 0.02lbs / 0.01kg shells, 1916 Model
   Machine guns in deck mounts
   on side, evenly spread, all raised mounts
Weight of broadside 370 lbs / 168 kg
Shells per gun, main battery: 180
8 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.50" / 38 mm 1.00" / 25 mm       -
3rd: 0.40" / 10 mm       -       -
4th: 0.40" / 10 mm       -       -

   - Conning tower: 1.50" / 38 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 31,348 shp / 23,385 Kw = 31.42 kts
Range 6,750nm at 12.00 kts
Bunker at max displacement = 437 tons

Complement:
138 - 180

Cost:
£0.350 million / $1.399 million

Distribution of weights at normal displacement:
Armament: 44 tons, 2.4 %
Armour: 30 tons, 1.6 %
    - Belts: 0 tons, 0.0 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 25 tons, 1.4 %
    - Armour Deck: 0 tons, 0.0 %
    - Conning Tower: 5 tons, 0.3 %
Machinery: 889 tons, 49.1 %
Hull, fittings & equipment: 471 tons, 26.0 %
Fuel, ammunition & stores: 317 tons, 17.5 %
Miscellaneous weights: 60 tons, 3.3 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
   379 lbs / 172 Kg = 5.7 x 5.1 " / 130 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 1.2 ft / 0.4 m
Roll period: 13.0 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.65
Seaboat quality  (Average = 1.00): 0.90

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.400
Length to Beam Ratio: 10.88 : 1
'Natural speed' for length: 19.24 kts
Power going to wave formation at top speed: 61 %
Trim (Max stability = 0, Max steadiness = 100): 78
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
    - Stem: 19.00 ft / 5.79 m
    - Forecastle (20 %): 16.00 ft / 4.88 m
    - Mid (45 %): 16.00 ft / 4.88 m (9.00 ft / 2.74 m aft of break)
    - Quarterdeck (15 %): 9.00 ft / 2.74 m
    - Stern: 9.00 ft / 2.74 m
    - Average freeboard:\tab 12.39 ft / 3.78 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 181.1 %
- Above water (accommodation/working, high = better): 70.2 %
Waterplane Area: 7,744 Square feet or 719 Square metres
Displacement factor (Displacement / loading): 65 %
Structure weight / hull surface area: 34 lbs/sq ft or 168 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 0.95
- Overall: 0.54


Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform
Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

  Seaboat quality is less than I like - but it's measured at 31.4 knots - on this size ship it's not a great surprise ...

Overall - I think a powerful little package - don't mess with a Broadsword !! ;)

[mentat]

And - along the theme of Superdestroyers (go on - you know you can't resist the idea)

  - going outside the rules - a real Superdestroyer


  - I present  'Rapier' -  but, perhaps more for the early 1920s .....


  Rapier,  BAE Weapon Class - Super Destroyer laid down 19??

Displacement:
2,820 t light; 2,959 t standard; 3,329 t normal; 3,626 t full load

Dimensions: Length overall / water x beam x draught
478.97 ft / 468.00 ft x 42.20 ft x 14.75 ft (normal load)
145.99 m / 142.65 m x 12.86 m  x 4.50 m

Armament:
      8 - 5.10" / 130 mm guns (4x2 guns), 70.00lbs / 31.75kg shells, 1916 Model
   Breech loading guns in deck mounts with hoists
   on centreline ends, evenly spread, 2 raised mounts - superfiring
      2 - 2.56" / 65.0 mm guns in single mounts, 8.50lbs / 3.86kg shells, 1916 Model
   Quick firing guns in deck mounts
   on side, evenly spread, all raised mounts
      6 - 1.00" / 25.4 mm guns (3x2 guns), 0.50lbs / 0.23kg shells, 1916 Model
   Machine guns in deck mounts
   on side, evenly spread, all raised mounts
    12 - 0.33" / 8.4 mm guns (2x6 guns), 0.02lbs / 0.01kg shells, 1916 Model
   Machine guns in deck mounts
   on side, evenly spread, all raised mounts
Weight of broadside 580 lbs / 263 kg
Shells per gun, main battery: 220
8 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.50" / 38 mm  1.00" / 25 mm       -
3rd: 0.40" / 10 mm       -       -
4th: 0.40" / 10 mm       -       -

   - Conning tower: 1.50" / 38 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 56,608 shp / 42,230 Kw = 34.00 kts
Range 7,000nm at 12.00 kts
Bunker at max displacement = 667 tons

Complement:
218 - 284

Cost:
  £0.681 million / $2.725 million

Distribution of weights at normal displacement:
Armament: 69 tons, 2.1 %
Armour: 41 tons, 1.2 %
    - Belts: 0 tons, 0.0 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 34 tons, 1.0 %
    - Armour Deck: 0 tons, 0.0 %
    - Conning Tower: 7 tons, 0.2 %
Machinery: 1,856 tons, 55.8 %
Hull, fittings & equipment: 784 tons, 23.5 %
Fuel, ammunition & stores: 509 tons, 15.3 %
Miscellaneous weights: 70 tons, 2.1 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
   543 lbs / 246 Kg = 8.2 x 5.1 " / 130 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.22
Metacentric height 2.0 ft / 0.6 m
Roll period: 12.6 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.40
Seaboat quality  (Average = 1.00): 0.79

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.400
Length to Beam Ratio: 11.09 : 1
'Natural speed' for length: 21.63 kts
Power going to wave formation at top speed: 59 %
Trim (Max stability = 0, Max steadiness = 100): 88
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 19.00 ft / 5.79 m
    - Forecastle (20 %): 16.00 ft / 4.88 m
    - Mid (45 %): 16.00 ft / 4.88 m (9.00 ft / 2.74 m aft of break)
    - Quarterdeck (15 %): 9.00 ft / 2.74 m
    - Stern: 9.00 ft / 2.74 m
    - Average freeboard: 12.39 ft / 3.78 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 198.7 %
- Above water (accommodation/working, high = better): 89.5 %
Waterplane Area: 12,157 Square feet or 1,129 Square metres
Displacement factor (Displacement / loading): 68 %
Structure weight / hull surface area: 40 lbs/sq ft or 198 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.52
- Longitudinal: 0.58
- Overall: 0.52

Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform
Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

NB - Seaboat quality - is measured at 34 knots


   - rather gorgeous - but a very expensive indulgence !!  ;D


  - well - at least for the present ....