Vilnius Union Ships, 1920+: Electric Drive Boogaloo

[The Rock Doctor]

Forgot to tick that box, which is weird because I thought it used to give me warnings there.

It's a single deck, yes. 

[Jefgte]

Used as a heavy monitor. Receiving a 1250 kg prune is not a gift for a cruiser.

[The Rock Doctor]

The Union isn't certain it needs or even wants a 450mm gun.  Cost-wise, a capital ship capable of carrying eight such guns would likely exceed 45,000 t (=$$$) and require lengthening of existing docks to construct.  It might not be possible to fit a three-gun mount on a ship capable of using the Trans-Eryka Canal.  The blast effects of the guns might be difficult to compensate for - the existing 400mm weapons are already quite disruptive as it is.

But it's still possible somebody else will field something of this size, so the prudent thing to do is to get a gun on a ship and see how it works so the option is available.  This particular platform embarks a single weapon for this purpose.

The hull and turret are protected against realistic shore-based artillery and light naval threats.  There are decent anti-surface and anti-air batteries for her size, with the assumption that she'll have escorts supporting her if she's out and about.  There was a temptation to install some light AA on the ample forecastle ahead of the gun, but everybody agreed the stuff might just get blown clean off the first time the gun fires ahead.

From a functionality point of view, this ship would be of very limited anti-surface utility given that there's a single barrel lobbing at best two rounds a minute.  On the other hand, the platform itself promises to be extremely steady.  Between that, the likely range of the gun, and the size of the projectiles, it could be a fairly fearsome shore bombardment tool. 

Enter ship name, Enter country Enter ship type laid down 1926

Displacement:
   8,086 t light; 8,483 t standard; 9,369 t normal; 10,077 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (402.56 ft / 393.70 ft) x 85.30 ft x (15.75 / 16.74 ft)
   (122.70 m / 120.00 m) x 26.00 m  x (4.80 / 5.10 m)

Armament:
      1 - 17.72" / 450 mm 45.0 cal gun - 2,976.24lbs / 1,350.00kg shells, 90 per gun
     Breech loading gun in turret on barbette mount, 1926 Model
     1 x Single mount on centreline, forward deck centre
      4 - 5.12" / 130 mm 45.0 cal guns - 67.61lbs / 30.67kg shells, 250 per gun
     Quick firing guns in deck and hoist mounts, 1926 Model
     2 x 2-gun mounts on centreline, aft evenly spread
      1 raised mount
      4 - 3.94" / 100.0 mm 45.0 cal guns - 30.77lbs / 13.96kg shells, 300 per gun
     Anti-air guns in deck mounts, 1926 Model
     4 x Single mounts on sides, aft deck forward
      12 - 0.59" / 15.0 mm 90.0 cal guns - 0.12lbs / 0.05kg shells, 4,000 per gun
     Machine guns in deck mounts, 1926 Model
     6 x Twin mounts on sides, evenly spread
      6 raised mounts
      Weight of broadside 3,371 lbs / 1,529 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   3.94" / 100 mm   255.91 ft / 78.00 m   16.37 ft / 4.99 m
   Ends:   Unarmoured
     Main Belt covers 100 % of normal length

   - Torpedo Bulkhead:
      1.57" / 40 mm   255.91 ft / 78.00 m   14.96 ft / 4.56 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   11.8" / 300 mm   5.12" / 130 mm      7.87" / 200 mm
   2nd:   1.97" / 50 mm   1.18" / 30 mm      1.97" / 50 mm
   3rd:   0.79" / 20 mm   0.79" / 20 mm            -
   4th:   0.59" / 15 mm   0.12" / 3 mm            -

   - Armoured deck - single deck: 2.95" / 75 mm For and Aft decks
   Forecastle: 1.97" / 50 mm  Quarter deck: 2.95" / 75 mm

   - Conning towers: Forward 3.94" / 100 mm,  Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Electric motors, 2 shafts, 8,042 shp / 6,000 Kw = 16.35 kts
   Range 16,400nm at 10.00 kts
   Bunker at max displacement = 1,594 tons

Complement:
   475 - 618

Cost:
   £2.116 million / $8.465 million

Distribution of weights at normal displacement:
   Armament: 627 tons, 6.7 %
   Armour: 2,769 tons, 29.6 %
      - Belts: 766 tons, 8.2 %
      - Torpedo bulkhead: 223 tons, 2.4 %
      - Armament: 438 tons, 4.7 %
      - Armour Deck: 1,304 tons, 13.9 %
      - Conning Tower: 38 tons, 0.4 %
   Machinery: 257 tons, 2.7 %
   Hull, fittings & equipment: 3,991 tons, 42.6 %
   Fuel, ammunition & stores: 1,283 tons, 13.7 %
   Miscellaneous weights: 441 tons, 4.7 %
      - Hull below water: 64 tons
      - Hull above water: 120 tons
      - On freeboard deck: 57 tons
      - Above deck: 200 tons

Fittings:
-64 t:  Electric motors (BW)
-120 t:  Torpedo nets (AW)
-63 t:  Fire control (AD)
-25 t:  Nightfighting doodads (AD)
-25 t:  L/R wireless (AD)
-50 t:  Command facilities (AD)
-94 t:  Weight reserve (FD/AD)

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     36,424 lbs / 16,522 Kg = 13.1 x 17.7 " / 450 mm shells or 9.0 torpedoes
   Stability (Unstable if below 1.00): 1.53
   Metacentric height 8.1 ft / 2.5 m
   Roll period: 12.6 seconds
   Steadiness   - As gun platform (Average = 50 %): 100 %
         - Recoil effect (Restricted arc if above 1.00): 0.33
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has low forecastle, rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.620 / 0.627
   Length to Beam Ratio: 4.62 : 1
   'Natural speed' for length: 19.84 kts
   Power going to wave formation at top speed: 42 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 10.00 degrees
   Stern overhang: 4.92 ft / 1.50 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   30.00 %,  22.31 ft / 6.80 m,  16.40 ft / 5.00 m
      - Forward deck:   30.00 %,  24.28 ft / 7.40 m,  24.28 ft / 7.40 m
      - Aft deck:   25.00 %,  16.40 ft / 5.00 m,  16.40 ft / 5.00 m
      - Quarter deck:   15.00 %,  16.40 ft / 5.00 m,  16.40 ft / 5.00 m
      - Average freeboard:      19.48 ft / 5.94 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 53.3 %
      - Above water (accommodation/working, high = better): 207.7 %
   Waterplane Area: 25,024 Square feet or 2,325 Square metres
   Displacement factor (Displacement / loading): 144 %
   Structure weight / hull surface area: 133 lbs/sq ft or 651 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.88
      - Longitudinal: 2.89
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is excellent
   Room for accommodation and workspaces is excellent
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

[The Rock Doctor]

Having posted that, drawings of the Japanese 460mm gun indicate that I might need six full decks to accommodate the turret, whereas I've only provided for five here.

[Jefgte]

From a functionality point of view, this ship would be of very limited anti-surface utility given that there's a single barrel lobbing at best two rounds a minute.  On the other hand, the platform itself promises to be extremely steady.  Between that, the likely range of the gun, and the size of the projectiles, it could be a fairly fearsome shore bombardment tool.

Very useful vs a colony revolt.

[The Rock Doctor]

My colonies love me and would never dream of revolting.

[The Rock Doctor]

The 1926 coastal escort takes advantage of slightly lighter machinery and trades some hull strength and anti-surface punch for the addition of a sonar dome, a bit more oil, and a bit more miscellaneous weight.

Enter ship name, Enter country Enter ship type laid down 1926

Displacement:
   250 t light; 260 t standard; 281 t normal; 297 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (147.17 ft / 137.80 ft) x 19.69 ft x (7.87 / 8.20 ft)
   (44.86 m / 42.00 m) x 6.00 m  x (2.40 / 2.50 m)

Armament:
      1 - 2.95" / 75.0 mm 45.0 cal gun - 12.98lbs / 5.89kg shells, 300 per gun
     Quick firing gun in deck mount, 1926 Model
     1 x Single mount on centreline, forward deck forward
      1 raised mount
      2 - 1.97" / 50.0 mm 45.0 cal guns - 3.85lbs / 1.74kg shells, 250 per gun
     Anti-air guns in deck mounts, 1926 Model
     2 x Single mounts on centreline, aft evenly spread
      1 raised mount
      4 - 0.59" / 15.0 mm 90.0 cal guns - 0.12lbs / 0.05kg shells, 4,000 per gun
     Machine guns in deck mounts, 1926 Model
     2 x Twin mounts on sides amidships
      2 raised mounts
      Weight of broadside 21 lbs / 10 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.79" / 20 mm   0.12" / 3 mm            -
   2nd:   0.79" / 20 mm   0.12" / 3 mm            -
   3rd:   0.59" / 15 mm         -               -

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 2,948 shp / 2,200 Kw = 20.34 kts
   Range 3,100nm at 10.00 kts
   Bunker at max displacement = 37 tons

Complement:
   33 - 44

Cost:
   £0.080 million / $0.321 million

Distribution of weights at normal displacement:
   Armament: 5 tons, 1.6 %
   Armour: 5 tons, 1.6 %
      - Armament: 5 tons, 1.6 %
   Machinery: 94 tons, 33.6 %
   Hull, fittings & equipment: 105 tons, 37.3 %
   Fuel, ammunition & stores: 30 tons, 10.8 %
   Miscellaneous weights: 42 tons, 15.0 %
      - Hull below water: 25 tons
      - On freeboard deck: 16 tons
      - Above deck: 1 tons

Fittings:
-15t:  Enhanced hydrophone package (BW)
-10t:  Sonar (BW)
-4t:  2x1 450mm torpedoes, fixed to fire just off the bows (FD)
-8t:  ASW weapons (FD)
-2t:  Nightfighting doodads (FD)
-2 t:  Weight reserve (FD)
-1 t:  1918 fire control (AD)

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     241 lbs / 109 Kg = 18.7 x 3.0 " / 75 mm shells or 0.3 torpedoes
   Stability (Unstable if below 1.00): 1.13
   Metacentric height 0.6 ft / 0.2 m
   Roll period: 11.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.20
   Seaboat quality  (Average = 1.00): 1.27

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.460 / 0.467
   Length to Beam Ratio: 7.00 : 1
   'Natural speed' for length: 11.74 kts
   Power going to wave formation at top speed: 71 %
   Trim (Max stability = 0, Max steadiness = 100): 55
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 3.28 ft / 1.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  16.73 ft / 5.10 m,  12.80 ft / 3.90 m
      - Forward deck:   20.00 %,  12.80 ft / 3.90 m,  8.86 ft / 2.70 m
      - Aft deck:   45.00 %,  8.86 ft / 2.70 m,  8.86 ft / 2.70 m
      - Quarter deck:   15.00 %,  8.86 ft / 2.70 m,  8.86 ft / 2.70 m
      - Average freeboard:      10.35 ft / 3.16 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 124.2 %
      - Above water (accommodation/working, high = better): 95.3 %
   Waterplane Area: 1,745 Square feet or 162 Square metres
   Displacement factor (Displacement / loading): 113 %
   Structure weight / hull surface area: 26 lbs/sq ft or 126 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.72
      - Longitudinal: 9.75
      - Overall: 0.93
   Caution: Hull subject to strain in open-sea
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is adequate
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

[The Rock Doctor]

I was sure I had posted refurb specs for the Wrogi class battleships but apparently not.  Anyway, there's nothing too dramatic here:

-Replace the secondary battery with QF guns
-Replace the tertiary anti-TB battery with AA guns and machine guns
-Add and move around miscellaneous weight for torpedo nets, FC, nightfighting, flag.
-Move to all oil-firing machinery
-Laminate another 30mm of armor on the forecastle.

The ship's deck plan doesn't reaaaaaally allow for floatplanes or more AA, unfortunately.

Note that the conning towers are actually 300mm/300mm, but this version of SS doesn't count the weight of the aft conning tower - so making the forward CT 600mm is a perfect fudge weight-wise.  I originally wrote that sentence with three "Actually"s in it, you know.

Total cost of the refurb is estimated at $7.18 and 0.997 BP.  It'll take about 8 months, so Wrogi will start in 2/25, Zwinny will follow in 1/26, and they'll both be out of service in Jan/Feb 1926.

Enter ship name, Enter country Enter ship type laid down 1908

Displacement:
   21,774 t light; 22,910 t standard; 24,692 t normal; 26,117 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (531.50 ft / 531.50 ft) x 91.86 ft x (27.23 / 28.56 ft)
   (162.00 m / 162.00 m) x 28.00 m  x (8.30 / 8.71 m)

Armament:
      12 - 11.81" / 300 mm 45.0 cal guns - 830.84lbs / 376.86kg shells, 90 per gun
     Breech loading guns in turret on barbette mounts, 1908 Model
     2 x Triple mounts on centreline, evenly spread
     2 x Triple mounts on sides amidships
     Aft Main mounts separated by engine room
      16 - 5.12" / 130 mm 45.0 cal guns - 67.61lbs / 30.67kg shells, 200 per gun
     Quick firing guns in casemate mounts, 1908 Model
     12 x Single mounts on sides amidships
      12 hull mounts in casemates- Limited use in heavy seas
     4 x Single mounts on sides amidships
      6 - 3.94" / 100.0 mm 45.0 cal guns - 30.77lbs / 13.96kg shells, 200 per gun
     Anti-air guns in deck mounts, 1908 Model
     6 x Single mounts on side ends, evenly spread
      6 raised mounts
      12 - 0.59" / 15.0 mm 90.0 cal guns - 0.12lbs / 0.05kg shells, 4,000 per gun
     Machine guns in deck mounts, 1908 Model
     4 x Twin mounts on sides amidships
      4 raised mounts
     4 x Single mounts on sides amidships
      4 raised mounts
      Weight of broadside 11,238 lbs / 5,097 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   11.8" / 300 mm   345.47 ft / 105.30 m   11.81 ft / 3.60 m
   Ends:   3.94" / 100 mm   185.99 ft / 56.69 m   11.81 ft / 3.60 m
   Upper:   5.91" / 150 mm   345.47 ft / 105.30 m   13.12 ft / 4.00 m
     Main Belt covers 100 % of normal length

   - Torpedo Bulkhead:
      1.97" / 50 mm   345.47 ft / 105.30 m   26.15 ft / 7.97 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   11.8" / 300 mm   7.87" / 200 mm      11.8" / 300 mm
   2nd:   1.97" / 50 mm   1.18" / 30 mm      3.94" / 100 mm
   3rd:   0.79" / 20 mm   0.79" / 20 mm            -
   4th:   0.59" / 15 mm   0.59" / 15 mm            -

   - Armoured deck - multiple decks: 2.95" / 75 mm For and Aft decks
   Forecastle: 2.36" / 60 mm  Quarter deck: 2.36" / 60 mm

   - Conning towers: Forward 11.81" / 300 mm,  Aft 11.81" / 300 mm
NOTE:  Forward CT simmed as 600mm to properly include aft CT weight.

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 46,917 shp / 35,000 Kw = 22.98 kts
   Range 10,700nm at 10.00 kts
   Bunker at max displacement = 3,207 tons

Complement:
   984 - 1,280

Cost:
   £2.086 million / $8.342 million

Distribution of weights at normal displacement:
   Armament: 2,002 tons, 8.1 %
   Armour: 9,057 tons, 36.7 %
      - Belts: 3,664 tons, 14.8 %
      - Torpedo bulkhead: 658 tons, 2.7 %
      - Armament: 2,321 tons, 9.4 %
      - Armour Deck: 1,982 tons, 8.0 %
      - Conning Tower: 432 tons, 1.7 %
   Machinery: 2,370 tons, 9.6 %
   Hull, fittings & equipment: 7,694 tons, 31.2 %
   Fuel, ammunition & stores: 2,918 tons, 11.8 %
   Miscellaneous weights: 651 tons, 2.6 %
      - Hull below water: 50 tons
      - Hull above water: 160 tons
      - On freeboard deck: 90 tons
      - Above deck: 351 tons

Fittings:
-50 t:  Torpedo flat (BW)
-160 t:  Torpedo nets (AW)
-90 t:  Weight reserve (FD)
-201 t:  1918 fire control (AD)
-100 t:  Flag facilities (AD)
-25 t:  Nightfighting doodads (AD)
-25 t:  L/R wireless (AD)

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     37,153 lbs / 16,852 Kg = 45.1 x 11.8 " / 300 mm shells or 6.1 torpedoes
   Stability (Unstable if below 1.00): 1.19
   Metacentric height 6.1 ft / 1.9 m
   Roll period: 15.6 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.61
   Seaboat quality  (Average = 1.00): 1.33

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.650 / 0.655
   Length to Beam Ratio: 5.79 : 1
   'Natural speed' for length: 23.05 kts
   Power going to wave formation at top speed: 54 %
   Trim (Max stability = 0, Max steadiness = 100): 53
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: -3.28 ft / -1.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  25.92 ft / 7.90 m,  21.00 ft / 6.40 m
      - Forward deck:   30.00 %,  21.00 ft / 6.40 m,  21.00 ft / 6.40 m
      - Aft deck:   35.00 %,  21.00 ft / 6.40 m,  21.00 ft / 6.40 m
      - Quarter deck:   15.00 %,  21.00 ft / 6.40 m,  21.00 ft / 6.40 m
      - Average freeboard:      21.39 ft / 6.52 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 88.2 %
      - Above water (accommodation/working, high = better): 152.0 %
   Waterplane Area: 37,403 Square feet or 3,475 Square metres
   Displacement factor (Displacement / loading): 103 %
   Structure weight / hull surface area: 164 lbs/sq ft or 800 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.93
      - Longitudinal: 1.92
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is excellent
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

Warning: Date too early for anti-air gun - 3rd battery

[The Rock Doctor]

A small river-monitor, intended to put a single 130mm gun in shallow water.  Well, on shallow water.  For the notion of smacking heavily fortified positions.

Or I could just wait for that 150mm howitzer to come along.


Enter ship name, Enter country Enter ship type laid down 1926

Displacement:
   204 t light; 215 t standard; 220 t normal; 224 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (149.43 ft / 144.36 ft) x 22.97 ft x (3.94 / 3.99 ft)
   (45.55 m / 44.00 m) x 7.00 m  x (1.20 / 1.22 m)

Armament:
      1 - 5.12" / 130 mm 45.0 cal gun - 67.61lbs / 30.67kg shells, 150 per gun
     Breech loading gun in deck and hoist mount, 1926 Model
     1 x Single mount on centreline forward
      1 - 1.97" / 50.0 mm 45.0 cal gun - 3.85lbs / 1.74kg shells, 250 per gun
     Anti-air gun in deck mount, 1926 Model
     1 x Single mount on centreline, aft deck centre
      4 - 0.59" / 15.0 mm 90.0 cal guns - 0.12lbs / 0.05kg shells, 4,000 per gun
     Machine guns in deck mounts, 1926 Model
     4 x Twin mounts on sides, evenly spread
      Weight of broadside 72 lbs / 33 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   1.57" / 40 mm     49.21 ft / 15.00 m   6.56 ft / 2.00 m
   Ends:   0.79" / 20 mm     95.11 ft / 28.99 m   3.94 ft / 1.20 m
     Main Belt covers 52 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.97" / 50 mm   1.18" / 30 mm      1.97" / 50 mm
   2nd:   0.79" / 20 mm   0.59" / 15 mm            -
   3rd:   0.59" / 15 mm         -               -

   - Box over machinery & magazines: 0.98" / 25 mm
   Forecastle: 0.00" / 0 mm  Quarter deck: 0.59" / 15 mm

   - Conning towers: Forward 0.59" / 15 mm,  Aft 0.00" / 0 mm

Machinery:
   Diesel Internal combustion motors,
   Geared drive, 2 shafts, 335 shp / 250 Kw = 12.12 kts
   Range 600nm at 10.00 kts
   Bunker at max displacement = 8 tons

Complement:
   28 - 37

Cost:
   £0.053 million / $0.214 million

Distribution of weights at normal displacement:
   Armament: 19 tons, 8.8 %
   Armour: 76 tons, 34.4 %
      - Belts: 38 tons, 17.1 %
      - Armament: 16 tons, 7.1 %
      - Armour Deck: 22 tons, 10.0 %
      - Conning Tower: 0 tons, 0.2 %
   Machinery: 11 tons, 4.9 %
   Hull, fittings & equipment: 85 tons, 38.6 %
   Fuel, ammunition & stores: 16 tons, 7.4 %
   Miscellaneous weights: 13 tons, 5.9 %
      - Hull below water: 4 tons
      - On freeboard deck: 6 tons
      - Above deck: 3 tons

Fittings:
-4t:  Diesels (BW)
-6t:  Cargo/passengers/weight reserve (FD)
-2t:  1918 fire control (AD)
-1t:  Searchlight (AD)

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     547 lbs / 248 Kg = 8.2 x 5.1 " / 130 mm shells or 0.8 torpedoes
   Stability (Unstable if below 1.00): 1.20
   Metacentric height 0.8 ft / 0.2 m
   Roll period: 11.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 75 %
         - Recoil effect (Restricted arc if above 1.00): 0.25
   Seaboat quality  (Average = 1.00): 1.04

Hull form characteristics:
   Hull has raised forecastle,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.590 / 0.592
   Length to Beam Ratio: 6.29 : 1
   'Natural speed' for length: 12.01 kts
   Power going to wave formation at top speed: 45 %
   Trim (Max stability = 0, Max steadiness = 100): 72
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 1.97 ft / 0.60 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   25.00 %,  8.53 ft / 2.60 m,  6.56 ft / 2.00 m
      - Forward deck:   25.00 %,  4.59 ft / 1.40 m,  4.59 ft / 1.40 m
      - Aft deck:   35.00 %,  4.59 ft / 1.40 m,  4.59 ft / 1.40 m
      - Quarter deck:   15.00 %,  4.59 ft / 1.40 m,  4.59 ft / 1.40 m
      - Average freeboard:      5.28 ft / 1.61 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 48.3 %
      - Above water (accommodation/working, high = better): 75.1 %
   Waterplane Area: 2,402 Square feet or 223 Square metres
   Displacement factor (Displacement / loading): 126 %
   Structure weight / hull surface area: 31 lbs/sq ft or 154 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.87
      - Longitudinal: 1.23
      - Overall: 0.90
   Caution: Hull subject to strain in open-sea
   Hull space for machinery, storage, compartmentation is excellent
   Room for accommodation and workspaces is cramped
   Ship has slow, easy roll, a good, steady gun platform

[The Rock Doctor]

The opposite of a small river monitor is the Johan Gadolin class battleship, also known as The G-Man.

This is not quite the simple updating of the Johann Encke class that had originally been envisioned.  Of note, there is more bunkerage, the armor belt is a full deck higher, and the secondary battery is a sextet of the new two-gun 150mm turrets also being installed on contemporary light cruisers.  The hull is consequently a fair bit longer and a little bit higher than the Encke's.

The ship also has two small hangers to house a floatplane each, on either side of the aft funnel, and the superstructure has been updated to replace the somewhat open tripod mast of previous classes with an enclosed tower thingy.  I might yet refine the look of that tower, as I'm not 100% happy with it, but you get the idea.

Enter ship name, Enter country Enter ship type laid down 1926

Displacement:
   44,100 t light; 46,177 t standard; 49,196 t normal; 51,611 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (765.58 ft / 748.03 ft) x 108.27 ft (Bulges 114.83 ft) x (30.84 / 32.20 ft)
   (233.35 m / 228.00 m) x 33.00 m (Bulges 35.00 m)  x (9.40 / 9.82 m)

Armament:
      8 - 15.75" / 400 mm 45.0 cal guns - 1,984.16lbs / 900.00kg shells, 100 per gun
     Breech loading guns in turret on barbette mounts, 1926 Model
     4 x 2-gun mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      12 - 5.91" / 150 mm 45.0 cal guns - 103.86lbs / 47.11kg shells, 250 per gun
     Breech loading guns in turret on barbette mounts, 1926 Model
     6 x 2-gun mounts on side ends, majority forward
      8 - 3.94" / 100.0 mm 45.0 cal guns - 30.77lbs / 13.96kg shells, 250 per gun
     Anti-air guns in deck mounts, 1926 Model
     6 x Single mounts on sides, forward deck aft
      6 raised mounts
     2 x Single mounts on sides, aft deck forward
      2 raised mounts
      16 - 0.59" / 15.0 mm 90.0 cal guns - 0.12lbs / 0.05kg shells, 4,000 per gun
     Machine guns in deck mounts, 1926 Model
     6 x Twin mounts on sides, evenly spread
      6 raised mounts
     4 x Single mounts on sides amidships
      4 raised mounts
      Weight of broadside 17,368 lbs / 7,878 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   13.8" / 350 mm   484.09 ft / 147.55 m   24.90 ft / 7.59 m
   Ends:   Unarmoured
     Main Belt covers 100 % of normal length

   - Torpedo Bulkhead:
      1.97" / 50 mm   484.09 ft / 147.55 m   29.59 ft / 9.02 m

   - Hull Bulges:
      0.59" / 15 mm   456.36 ft / 139.10 m   29.20 ft / 8.90 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   17.7" / 450 mm   7.87" / 200 mm      15.7" / 400 mm
   2nd:   4.72" / 120 mm   1.97" / 50 mm      3.94" / 100 mm
   3rd:   0.79" / 20 mm   0.79" / 20 mm            -
   4th:   0.59" / 15 mm         -               -

   - Armoured deck - single deck: 5.51" / 140 mm For and Aft decks
   Forecastle: 3.94" / 100 mm  Quarter deck: 5.51" / 140 mm

   - Conning towers: Forward 15.75" / 400 mm,  Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 4 shafts, 119,303 shp / 89,000 Kw = 27.03 kts
   Range 20,000nm at 10.00 kts
   Bunker at max displacement = 5,434 tons

Complement:
   1,651 - 2,147

Cost:
   £12.703 million / $50.813 million

Distribution of weights at normal displacement:
   Armament: 3,538 tons, 7.2 %
   Armour: 19,760 tons, 40.2 %
      - Belts: 7,211 tons, 14.7 %
      - Torpedo bulkhead: 1,043 tons, 2.1 %
      - Bulges: 291 tons, 0.6 %
      - Armament: 4,543 tons, 9.2 %
      - Armour Deck: 6,216 tons, 12.6 %
      - Conning Tower: 456 tons, 0.9 %
   Machinery: 3,819 tons, 7.8 %
   Hull, fittings & equipment: 15,960 tons, 32.4 %
   Fuel, ammunition & stores: 5,096 tons, 10.4 %
   Miscellaneous weights: 1,023 tons, 2.1 %
      - On freeboard deck: 473 tons
      - Above deck: 550 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     87,167 lbs / 39,538 Kg = 44.6 x 15.7 " / 400 mm shells or 15.6 torpedoes
   Stability (Unstable if below 1.00): 1.13
   Metacentric height 7.1 ft / 2.2 m
   Roll period: 18.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.56
   Seaboat quality  (Average = 1.00): 1.25

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.650 / 0.653
   Length to Beam Ratio: 6.51 : 1
   'Natural speed' for length: 27.35 kts
   Power going to wave formation at top speed: 51 %
   Trim (Max stability = 0, Max steadiness = 100): 56
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 6.56 ft / 2.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  30.18 ft / 9.20 m,  23.95 ft / 7.30 m
      - Forward deck:   40.00 %,  23.95 ft / 7.30 m,  23.95 ft / 7.30 m
      - Aft deck:   25.00 %,  23.95 ft / 7.30 m,  23.95 ft / 7.30 m
      - Quarter deck:   15.00 %,  23.95 ft / 7.30 m,  23.95 ft / 7.30 m
      - Average freeboard:      24.45 ft / 7.45 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 68.2 %
      - Above water (accommodation/working, high = better): 171.4 %
   Waterplane Area: 62,041 Square feet or 5,764 Square metres
   Displacement factor (Displacement / loading): 113 %
   Structure weight / hull surface area: 203 lbs/sq ft or 994 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.96
      - Longitudinal: 1.34
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is excellent
   Room for accommodation and workspaces is excellent
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

13,800 nm @ 12 kts
8,400 nm @ 15 kts
4,200 nm @ 20 kts
1,700 nm @ 27 kts

[The Rock Doctor]

I belatedly realized my 1924 U-class torpedo-boat only had 49.6% of normal weight assigned to machinery.  Taking a razor-thin margin from a class two years earlier will do that when engine weights get lighter.

So I'm ret-conning just a bit.  An additional 500 kw of machinery gets me over the hump, at the cost of two torpedoes, a bit of misc. weight, and some main battery protection.

Corrected U class torpedoboat, laid down 1924

Displacement:
   1,885 t light; 1,974 t standard; 2,250 t normal; 2,471 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (388.70 ft / 377.30 ft) x 36.09 ft x (14.11 / 15.02 ft)
   (118.48 m / 115.00 m) x 11.00 m  x (4.30 / 4.58 m)

Armament:
      4 - 5.12" / 130 mm 45.0 cal guns - 67.61lbs / 30.67kg shells, 250 per gun
     Quick firing guns in deck and hoist mounts, 1924 Model
     4 x Single mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      1 - 3.94" / 100.0 mm 45.0 cal gun - 30.77lbs / 13.96kg shells, 250 per gun
     Anti-air gun in deck mount, 1924 Model
     1 x Single mount on centreline, forward deck aft
      1 raised mount
      8 - 0.59" / 15.0 mm 90.0 cal guns - 0.12lbs / 0.05kg shells, 4,000 per gun
     Machine guns in deck mounts, 1924 Model
     4 x Twin mounts on sides, evenly spread
      4 raised mounts
      Weight of broadside 302 lbs / 137 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.18" / 30 mm   0.79" / 20 mm      1.18" / 30 mm
   2nd:   0.79" / 20 mm   0.12" / 3 mm            -

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 40,885 shp / 30,500 Kw = 32.38 kts
   Range 12,000nm at 10.00 kts
   Bunker at max displacement = 497 tons

Complement:
   163 - 212

Cost:
   £0.778 million / $3.112 million

Distribution of weights at normal displacement:
   Armament: 79 tons, 3.5 %
   Armour: 25 tons, 1.1 %
      - Armament: 25 tons, 1.1 %
   Machinery: 1,129 tons, 50.2 %
   Hull, fittings & equipment: 533 tons, 23.7 %
   Fuel, ammunition & stores: 365 tons, 16.2 %
   Miscellaneous weights: 119 tons, 5.3 %
      - Hull below water: 25 tons
      - On freeboard deck: 49 tons
      - Above deck: 45 tons

Fittings:
-8 t:  1918 fire control (AD)
-25 t:  L/R wireless (AD)
-10 t:  Nightfighting doodads (AD)
-24 t:  2x3 21" TT (FD)
-15 t:  ASW munitions (FD)
-12 t:  Weight reserve (mostly FD)
-10 t:  Sonar
-15 t:  Enhanced hydrophones

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     537 lbs / 244 Kg = 8.0 x 5.1 " / 130 mm shells or 0.3 torpedoes
   Stability (Unstable if below 1.00): 1.19
   Metacentric height 1.5 ft / 0.5 m
   Roll period: 12.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 60 %
         - Recoil effect (Restricted arc if above 1.00): 0.46
   Seaboat quality  (Average = 1.00): 1.00

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.410 / 0.423
   Length to Beam Ratio: 10.45 : 1
   'Natural speed' for length: 19.42 kts
   Power going to wave formation at top speed: 63 %
   Trim (Max stability = 0, Max steadiness = 100): 60
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 3.28 ft / 1.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  22.31 ft / 6.80 m,  18.37 ft / 5.60 m
      - Forward deck:   26.00 %,  18.37 ft / 5.60 m,  18.37 ft / 5.60 m
      - Aft deck:   39.00 %,  10.50 ft / 3.20 m,  10.50 ft / 3.20 m
      - Quarter deck:   15.00 %,  10.50 ft / 3.20 m,  10.50 ft / 3.20 m
      - Average freeboard:      14.44 ft / 4.40 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 175.5 %
      - Above water (accommodation/working, high = better): 134.5 %
   Waterplane Area: 8,432 Square feet or 783 Square metres
   Displacement factor (Displacement / loading): 73 %
   Structure weight / hull surface area: 36 lbs/sq ft or 175 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.34
      - Overall: 0.55
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is excellent

[The Rock Doctor]

The V-class sloops are, functionally, replacements for the Vitava class protected cruisers, which have spent the last few years as heavy patrol assets in the Caribbean.

Though the sloop lacks significant protection, it has a heavier armament, superior speed and range, and scouting capability that the older cruisers lack.  It also has the legs for a patrol into the Atlantic and the command facilities to control an escort group as required.

A notional build of six to eight units is anticipated at this time. 

Enter ship name, Enter country Enter ship type laid down 1926

Displacement:
   2,153 t light; 2,287 t standard; 2,785 t normal; 3,184 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (408.86 ft / 396.98 ft) x 42.65 ft x (12.80 / 14.09 ft)
   (124.62 m / 121.00 m) x 13.00 m  x (3.90 / 4.29 m)

Armament:
      6 - 5.12" / 130 mm 45.0 cal guns - 67.61lbs / 30.67kg shells, 300 per gun
     Quick firing guns in deck and hoist mounts, 1926 Model
     2 x 2-gun mounts on centreline, forward evenly spread
      1 raised mount
     1 x 2-gun mount on centreline, aft deck aft
      2 - 3.94" / 100.0 mm 45.0 cal guns - 30.77lbs / 13.96kg shells, 250 per gun
     Anti-air guns in deck mounts, 1926 Model
     2 x Single mounts on sides, forward deck aft
      8 - 0.59" / 15.0 mm 90.0 cal guns - 0.12lbs / 0.05kg shells, 4,000 per gun
     Machine guns in deck mounts, 1926 Model
     4 x Twin mounts on sides, evenly spread
      4 raised mounts
      Weight of broadside 468 lbs / 212 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.97" / 50 mm   1.18" / 30 mm      1.97" / 50 mm
   2nd:   0.79" / 20 mm   0.79" / 20 mm            -
   3rd:   0.59" / 15 mm   0.12" / 3 mm            -

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

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 20,107 shp / 15,000 Kw = 26.28 kts
   Range 20,000nm at 10.00 kts
   Bunker at max displacement = 897 tons

Complement:
   191 - 249

Cost:
   £0.717 million / $2.866 million

Distribution of weights at normal displacement:
   Armament: 121 tons, 4.4 %
   Armour: 60 tons, 2.1 %
      - Armament: 51 tons, 1.8 %
      - Conning Tower: 8 tons, 0.3 %
   Machinery: 644 tons, 23.1 %
   Hull, fittings & equipment: 1,071 tons, 38.4 %
   Fuel, ammunition & stores: 632 tons, 22.7 %
   Miscellaneous weights: 258 tons, 9.3 %
      - Hull below water: 25 tons
      - On freeboard deck: 123 tons
      - Above deck: 110 tons

Fittings:
-10 t:  Sonar (BW)
-15 t:  Enhanced hydrophone package (BW)
-75 t:  Two armed floatplanes and a catapult (FD)
-15 t:  ASW ordnance (FD)
-16 t:  2x2 heavyweigtht 530mm torpedo carriages, no reloads (AD)
-50 t:  Command facilities (AD)
-12 t:  1918 fire control (AD)
-10 t:  Nightfighting doodads (AD)
-25 t:  L/R wireless (AD)
-30 t:  Weight reserve (AD/FD)


Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     3,982 lbs / 1,806 Kg = 59.4 x 5.1 " / 130 mm shells or 1.0 torpedoes
   Stability (Unstable if below 1.00): 1.15
   Metacentric height 1.8 ft / 0.6 m
   Roll period: 13.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.45
   Seaboat quality  (Average = 1.00): 1.52

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.450 / 0.467
   Length to Beam Ratio: 9.31 : 1
   'Natural speed' for length: 19.92 kts
   Power going to wave formation at top speed: 54 %
   Trim (Max stability = 0, Max steadiness = 100): 46
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 3.28 ft / 1.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  23.62 ft / 7.20 m,  18.70 ft / 5.70 m
      - Forward deck:   40.00 %,  18.70 ft / 5.70 m,  18.70 ft / 5.70 m
      - Aft deck:   25.00 %,  10.83 ft / 3.30 m,  10.83 ft / 3.30 m
      - Quarter deck:   15.00 %,  10.83 ft / 3.30 m,  10.83 ft / 3.30 m
      - Average freeboard:      15.94 ft / 4.86 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 92.0 %
      - Above water (accommodation/working, high = better): 168.8 %
   Waterplane Area: 10,800 Square feet or 1,003 Square metres
   Displacement factor (Displacement / loading): 139 %
   Structure weight / hull surface area: 62 lbs/sq ft or 303 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.82
      - Longitudinal: 1.97
      - Overall: 0.90
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is excellent
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

[The Rock Doctor]

The 1926 oiler is a mild upgrade of the preceding Vanem type.  A little faster, a few more machine guns, a few tonnes more oil.

Enter ship name, Enter country Enter ship type laid down 1926

Displacement:
   9,035 t light; 9,278 t standard; 10,683 t normal; 11,807 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (419.60 ft / 410.11 ft) x 65.62 ft x (25.26 / 27.36 ft)
   (127.89 m / 125.00 m) x 20.00 m  x (7.70 / 8.34 m)

Armament:
      2 - 5.12" / 130 mm 45.0 cal guns - 67.61lbs / 30.67kg shells, 250 per gun
     Quick firing guns in deck and hoist mount, 1926 Model
     1 x 2-gun mount on centreline, aft deck aft
      2 - 3.94" / 100.0 mm 45.0 cal guns - 30.77lbs / 13.96kg shells, 250 per gun
     Anti-air guns in deck mounts, 1926 Model
     1 x Single mount on centreline, forward deck forward
     1 x Single mount on centreline, aft deck aft
      1 raised mount
      8 - 0.59" / 15.0 mm 90.0 cal guns - 0.12lbs / 0.05kg shells, 4,000 per gun
     Machine guns in deck mounts, 1926 Model
     4 x Twin mounts on sides, evenly spread
      4 raised mounts
      Weight of broadside 198 lbs / 90 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.97" / 50 mm   1.18" / 30 mm      1.97" / 50 mm
   2nd:   0.79" / 20 mm   0.59" / 15 mm            -
   3rd:   0.59" / 15 mm         -               -

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 12,065 shp / 9,000 Kw = 18.35 kts
   Range 26,300nm at 10.00 kts
   Bunker at max displacement = 2,529 tons

Complement:
   525 - 683

Cost:
   £1.335 million / $5.341 million

Distribution of weights at normal displacement:
   Armament: 49 tons, 0.5 %
   Armour: 21 tons, 0.2 %
      - Armament: 21 tons, 0.2 %
   Machinery: 386 tons, 3.6 %
   Hull, fittings & equipment: 2,302 tons, 21.5 %
   Fuel, ammunition & stores: 1,648 tons, 15.4 %
   Miscellaneous weights: 6,277 tons, 58.8 %
      - Hull below water: 4,000 tons
      - Hull above water: 1,790 tons
      - On freeboard deck: 400 tons
      - Above deck: 87 tons

Fittings:
-5 t:  1918 Fire control (AD)
-25 t:  L/R wireless (AD)
-20 t:  Accommodation for 10 passengers (AD)
-37 t:  Weight reserve/cargo/mail (AD)
-400 t:  Oil handling equipment (FD)
-5,790 t:  Fuel oil (AW/BW)

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     15,276 lbs / 6,929 Kg = 227.9 x 5.1 " / 130 mm shells or 2.3 torpedoes
   Stability (Unstable if below 1.00): 1.49
   Metacentric height 5.3 ft / 1.6 m
   Roll period: 12.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 100 %
         - Recoil effect (Restricted arc if above 1.00): 0.03
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.550 / 0.561
   Length to Beam Ratio: 6.25 : 1
   'Natural speed' for length: 20.25 kts
   Power going to wave formation at top speed: 45 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 10.00 degrees
   Stern overhang: 4.92 ft / 1.50 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   15.00 %,  25.92 ft / 7.90 m,  21.00 ft / 6.40 m
      - Forward deck:   10.00 %,  21.00 ft / 6.40 m,  21.00 ft / 6.40 m
      - Aft deck:   60.00 %,  13.12 ft / 4.00 m,  13.12 ft / 4.00 m
      - Quarter deck:   15.00 %,  13.12 ft / 4.00 m,  13.12 ft / 4.00 m
      - Average freeboard:      15.39 ft / 4.69 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 72.8 %
      - Above water (accommodation/working, high = better): 97.1 %
   Waterplane Area: 18,780 Square feet or 1,745 Square metres
   Displacement factor (Displacement / loading): 148 %
   Structure weight / hull surface area: 82 lbs/sq ft or 400 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.93
      - Longitudinal: 1.82
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is excellent
   Room for accommodation and workspaces is adequate
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

[The Rock Doctor]

The Swarm - that lovable horde of torpedo-craft defending the Baltic straits from nasty interlopers - is poised to bring 80t motor-torpedo boats into service.  These would, over time, replace the various H and I class torpedo-boats currently making up the majority of the order of battle.

Controlling a bunch of such craft in action would be difficult from one of the MTBs itself, and the four newish torpedo-boats in the Swarm, the oddball P-class, aren't set up with command facilities.

A new, small torpedo-boat with 4x100mm guns would be able to lend considerable local fire support against enemy small craft or lob starshells at enemy large craft, while retaining a modest flag bridge for the junior officer commanding a squadron of MTBs.  Speed and range reflect a general assumption that it would be tethered to the short-legged MTBs at all times, and the complete lack of ASW capability reflects its singular role.


Enter ship name, Enter country Enter ship type laid down 1926

Displacement:
   696 t light; 730 t standard; 773 t normal; 808 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (286.04 ft / 275.59 ft) x 24.93 ft x (9.84 / 10.13 ft)
   (87.18 m / 84.00 m) x 7.60 m  x (3.00 / 3.09 m)

Armament:
      4 - 3.94" / 100.0 mm 45.0 cal guns - 30.77lbs / 13.96kg shells, 250 per gun
     Quick firing guns in deck mounts, 1926 Model
     4 x Single mounts on centreline, evenly spread
      2 raised mounts
     Aft Main mounts separated by engine room
      6 - 0.59" / 15.0 mm 90.0 cal guns - 0.12lbs / 0.05kg shells, 4,000 per gun
     Machine guns in deck mounts, 1926 Model
     2 x Twin mounts on sides amidships
     1 x Twin mount on centreline, aft deck forward
      1 raised mount
      Weight of broadside 124 lbs / 56 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.98" / 25 mm   0.12" / 3 mm            -

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 20,107 shp / 15,000 Kw = 30.95 kts
   Range 3,500nm at 10.00 kts
   Bunker at max displacement = 78 tons

Complement:
   73 - 95

Cost:
   £0.295 million / $1.178 million

Distribution of weights at normal displacement:
   Armament: 23 tons, 2.9 %
   Armour: 6 tons, 0.7 %
      - Armament: 6 tons, 0.7 %
   Machinery: 390 tons, 50.5 %
   Hull, fittings & equipment: 233 tons, 30.1 %
   Fuel, ammunition & stores: 77 tons, 10.0 %
   Miscellaneous weights: 44 tons, 5.7 %
      - On freeboard deck: 12 tons
      - Above deck: 32 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     230 lbs / 104 Kg = 7.5 x 3.9 " / 100 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.17
   Metacentric height 0.8 ft / 0.3 m
   Roll period: 11.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.36
   Seaboat quality  (Average = 1.00): 1.07

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.400 / 0.406
   Length to Beam Ratio: 11.05 : 1
   'Natural speed' for length: 16.60 kts
   Power going to wave formation at top speed: 67 %
   Trim (Max stability = 0, Max steadiness = 100): 47
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 3.28 ft / 1.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  19.69 ft / 6.00 m,  15.75 ft / 4.80 m
      - Forward deck:   30.00 %,  15.75 ft / 4.80 m,  15.75 ft / 4.80 m
      - Aft deck:   35.00 %,  7.87 ft / 2.40 m,  7.87 ft / 2.40 m
      - Quarter deck:   15.00 %,  7.87 ft / 2.40 m,  7.87 ft / 2.40 m
      - Average freeboard:      12.13 ft / 3.70 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 172.4 %
      - Above water (accommodation/working, high = better): 127.0 %
   Waterplane Area: 4,230 Square feet or 393 Square metres
   Displacement factor (Displacement / loading): 55 %
   Structure weight / hull surface area: 26 lbs/sq ft or 127 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 2.62
      - Overall: 0.59
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is excellent

Fittings: 
-12 t:  1x3 heavyweight 53cm torpedoes or 2x2 lightweight 53cm torpedoes, not sure yet
-3t:  Fire control
-5 t:  Night-fighting doodads
-24 t:  MTB squadron command center and maybe a bit of weight reserve.

[TacCovert4]

I would suggest,  since you have passed 500t, take it up to 750t. See how much more speed you can put in, even if you reduce range to 3000nm.  I'd also suggest a 6 torpedo broadside.   This ship will be able to launch torps from nearly double the effective range of an MTB.  Make the best use of it.  They can launch while their mtbs are retreating,