Vilnius Union Ships, 1920+: Electric Drive Boogaloo

[The Rock Doctor]

A short-ranged, relatively fast "lifeboat" for customs/law enforcement/search-and-rescue work in places without a normal fast naval presence.  Obviously the lifeboat lacks the seakeeping ability of a larger ship, but 0.69 isn't terrible for the speed and size. 

Much as I'd prefer to try out diesels on this thing for fuel efficiency, the weight requirements don't let it work.  That said, the lifeboat's machinery takes up half the weight and so should qualify as destroyer-standard hardware. 

A small amount of miscellaneous weight is set aside as a working space - for customs agents to ride-along, or to house survivors, that sort of thing.

It'd be built as an auxiliary, in theory.  The colors in the sketch reflect service in the Union Coast Guard

Enter ship name, Enter country Enter ship type laid down 1921

Displacement:
   55 t light; 57 t standard; 61 t normal; 64 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (87.81 ft / 82.02 ft) x 13.12 ft x (4.92 / 5.08 ft)
   (26.76 m / 25.00 m) x 4.00 m  x (1.50 / 1.55 m)

Armament:
      2 - 0.39" / 10.0 mm 45.0 cal guns - 0.03lbs / 0.01kg shells, 2,000 per gun
     Breech loading guns in deck mounts, 1921 Model
     2 x Single mounts on sides amidships
      2 raised mounts
      Weight of broadside 0 lbs / 0 kg

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 1,273 shp / 950 Kw = 19.52 kts
   Range 160nm at 19.00 kts
   Bunker at max displacement = 7 tons

Complement:
   10 - 14

Cost:
   £0.016 million / $0.064 million

Distribution of weights at normal displacement:
   Armament: 0 tons, 0.1 %
      - Guns: 0 tons, 0.1 %
   Machinery: 31 tons, 50.6 %
   Hull, fittings & equipment: 22 tons, 35.8 %
   Fuel, ammunition & stores: 5 tons, 8.5 %
   Miscellaneous weights: 3 tons, 5.0 %
      - Hull above water: 3 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     25 lbs / 11 Kg = 825.4 x 0.4 " / 10 mm shells or 0.1 torpedoes
   Stability (Unstable if below 1.00): 1.14
   Metacentric height 0.3 ft / 0.1 m
   Roll period: 10.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 60 %
         - Recoil effect (Restricted arc if above 1.00): 0.00
   Seaboat quality  (Average = 1.00): 0.87

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.400 / 0.407
   Length to Beam Ratio: 6.25 : 1
   'Natural speed' for length: 9.06 kts
   Power going to wave formation at top speed: 79 %
   Trim (Max stability = 0, Max steadiness = 100): 69
   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:   20.00 %,  10.50 ft / 3.20 m,  8.53 ft / 2.60 m
      - Forward deck:   30.00 %,  8.53 ft / 2.60 m,  6.56 ft / 2.00 m
      - Aft deck:   35.00 %,  6.56 ft / 2.00 m,  6.56 ft / 2.00 m
      - Quarter deck:   15.00 %,  6.56 ft / 2.00 m,  6.56 ft / 2.00 m
      - Average freeboard:      7.41 ft / 2.26 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 169.4 %
      - Above water (accommodation/working, high = better): 88.5 %
   Waterplane Area: 663 Square feet or 62 Square metres
   Displacement factor (Displacement / loading): 67 %
   Structure weight / hull surface area: 13 lbs/sq ft or 62 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 13.81
      - Overall: 0.70
   Caution: Hull subject to strain in open-sea
   Cramped machinery, storage, compartmentation space
   Cramped accommodation and workspace room
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

[The Rock Doctor]

Oh crap my engine year is all wrong.

[snip]

Time to prune this timeline?

[The Rock Doctor]

Time to prune this timeline?

I don't get the reference but I have fixed the post, at least.

[The Rock Doctor]

oh no



Enter ship name, Enter country Enter ship type laid down 1921

Displacement:
   5,465 t light; 5,674 t standard; 6,397 t normal; 6,975 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (490.08 ft / 475.72 ft) x 49.21 ft x (17.39 / 18.63 ft)
   (149.38 m / 145.00 m) x 15.00 m  x (5.30 / 5.68 m)

Armament:
      1 - 11.81" / 300 mm 45.0 cal gun - 830.83lbs / 376.86kg shells, 75 per gun
     Breech loading gun in turret on barbette mount, 1921 Model
     1 x Single mount on centreline, forward deck centre
      4 - 5.12" / 130 mm 45.0 cal guns - 67.62lbs / 30.67kg shells, 250 per gun
     Quick firing guns in deck and hoist mounts, 1921 Model
     2 x 2-gun mounts on centreline, aft evenly spread
      1 raised mount
      2 - 3.94" / 100 mm 45.0 cal guns - 30.78lbs / 13.96kg shells, 250 per gun
     Anti-air guns in deck mounts, 1921 Model
     2 x Single mounts on sides, aft deck forward
      4 - 0.39" / 10.0 mm 45.0 cal guns - 0.02lbs / 0.01kg shells, 4,000 per gun
     Machine guns in deck mounts, 1921 Model
     4 x Single mounts on sides, evenly spread
      4 raised mounts
      Weight of broadside 1,163 lbs / 527 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   3.15" / 80 mm   328.08 ft / 100.00 m   15.75 ft / 4.80 m
   Ends:   Unarmoured
     Main Belt covers 106 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   2.95" / 75 mm   0.98" / 25 mm      2.95" / 75 mm
   2nd:   1.97" / 50 mm   0.79" / 20 mm      1.97" / 50 mm
   3rd:   0.79" / 20 mm   0.39" / 10 mm            -

   - Armoured deck - multiple decks:
   For and Aft decks: 0.98" / 25 mm
   Forecastle: 0.98" / 25 mm  Quarter deck: 0.98" / 25 mm

   - Conning towers: Forward 3.15" / 80 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 50,939 shp / 38,000 Kw = 29.36 kts
   Range 16,400nm at 10.00 kts
   Bunker at max displacement = 1,301 tons

Complement:
   356 - 464

Cost:
   £1.383 million / $5.531 million

Distribution of weights at normal displacement:
   Armament: 267 tons, 4.2 %
      - Guns: 267 tons, 4.2 %
   Armour: 1,070 tons, 16.7 %
      - Belts: 666 tons, 10.4 %
      - Armament: 81 tons, 1.3 %
      - Armour Deck: 300 tons, 4.7 %
      - Conning Tower: 23 tons, 0.4 %
   Machinery: 1,754 tons, 27.4 %
   Hull, fittings & equipment: 2,270 tons, 35.5 %
   Fuel, ammunition & stores: 932 tons, 14.6 %
   Miscellaneous weights: 105 tons, 1.6 %
      - On freeboard deck: 50 tons
      - Above deck: 55 tons

Fittings:
-27 t:  1918 fire control
-25 t:  L/R wireless
-25 t:  Armed floatplane
-25 t:  Night-fighting doodads
-3 t:    Weight reserve

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     6,898 lbs / 3,129 Kg = 8.4 x 11.8 " / 300 mm shells or 1.1 torpedoes
   Stability (Unstable if below 1.00): 1.13
   Metacentric height 2.2 ft / 0.7 m
   Roll period: 14.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 60 %
         - Recoil effect (Restricted arc if above 1.00): 0.55
   Seaboat quality  (Average = 1.00): 1.08

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.550 / 0.560
   Length to Beam Ratio: 9.67 : 1
   'Natural speed' for length: 21.81 kts
   Power going to wave formation at top speed: 59 %
   Trim (Max stability = 0, Max steadiness = 100): 56
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 4.92 ft / 1.50 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   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 %,  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:      17.45 ft / 5.32 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 104.5 %
      - Above water (accommodation/working, high = better): 146.5 %
   Waterplane Area: 16,339 Square feet or 1,518 Square metres
   Displacement factor (Displacement / loading): 112 %
   Structure weight / hull surface area: 89 lbs/sq ft or 432 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.94
      - Longitudinal: 1.73
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room

[Jefgte]

After destroyers, it's cruiser.
I'm waiting for the 400/45 gun... or super monitor.

;)

[The Rock Doctor]

I refer you to the 1918-built Attakulla with a triple 400/45 turret.

Unless/until I jump to 450mm, it's probably the biggest monitor I'll put out.

[The Rock Doctor]

The Union's icebreaker fleet is getting a little long in the tooth, so a new class will be built to replace the oldest units.

Like the rest of the icebreaker fleet, the Helgoland and sisters will be operated by the Coast Guard.  There is a light armament for inspection and law enforcement duties, some towing capability, and a working space that can accommodate wreck survivors. 

I have modelled light belts to protect against single-year ice, and added a fair bit of below-water miscellaneous weight to represent hull bracing, extra subdivision, and all that jazz.

That said, the class will be built to mercantile standards.


Enter ship name, Enter country Enter ship type laid down 1921

Displacement:
   1,785 t light; 1,825 t standard; 1,983 t normal; 2,110 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (204.30 ft / 196.85 ft) x 39.37 ft x (13.78 / 14.52 ft)
   (62.27 m / 60.00 m) x 12.00 m  x (4.20 / 4.43 m)

Armament:
      2 - 1.97" / 50.0 mm 45.0 cal guns - 3.85lbs / 1.74kg shells, 150 per gun
     Quick firing guns in deck mounts, 1921 Model
     2 x Single mounts on centreline, evenly spread
      2 raised mounts
      2 - 0.39" / 10.0 mm 45.0 cal guns - 0.03lbs / 0.01kg shells, 4,000 per gun
     Machine guns in deck mounts, 1921 Model
     2 x Single mounts on sides, forward deck aft
      2 raised mounts
      Weight of broadside 8 lbs / 4 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   0.59" / 15 mm   144.36 ft / 44.00 m   5.91 ft / 1.80 m
   Ends:   0.98" / 25 mm     52.49 ft / 16.00 m   5.91 ft / 1.80 m
     Main Belt covers 113 % of normal length

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

Machinery:
   Coal and oil fired boilers, complex reciprocating steam engines,
   Direct drive, 3 shafts, 6,703 ihp / 5,000 Kw = 18.63 kts
   Range 4,000nm at 10.00 kts
   Bunker at max displacement = 284 tons (90% coal)

Complement:
   148 - 193

Cost:
   £0.312 million / $1.249 million

Distribution of weights at normal displacement:
   Armament: 2 tons, 0.1 %
      - Guns: 2 tons, 0.1 %
   Armour: 36 tons, 1.8 %
      - Belts: 34 tons, 1.7 %
      - Armament: 2 tons, 0.1 %
   Machinery: 427 tons, 21.5 %
   Hull, fittings & equipment: 695 tons, 35.1 %
   Fuel, ammunition & stores: 198 tons, 10.0 %
   Miscellaneous weights: 625 tons, 31.5 %
      - Hull below water: 200 tons
      - Hull above water: 100 tons
      - On freeboard deck: 300 tons
      - Above deck: 25 tons

Fittings:
-25 t:  L/R wireless (AD)
-100 t:  Emergency accommodations (FD)
-150 t:  Towing rig (FD)
-150 t:  Weight reserve (FD/AW)
-200 t:  Hull reinforcement and pumps (BW)

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     3,008 lbs / 1,364 Kg = 788.6 x 2.0 " / 50 mm shells or 0.9 torpedoes
   Stability (Unstable if below 1.00): 1.19
   Metacentric height 1.7 ft / 0.5 m
   Roll period: 12.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 78 %
         - Recoil effect (Restricted arc if above 1.00): 0.01
   Seaboat quality  (Average = 1.00): 1.44

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.650 / 0.656
   Length to Beam Ratio: 5.00 : 1
   'Natural speed' for length: 14.03 kts
   Power going to wave formation at top speed: 69 %
   Trim (Max stability = 0, Max steadiness = 100): 54
   Bow angle (Positive = bow angles forward): 10.00 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,  19.69 ft / 6.00 m
      - Forward deck:   40.00 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
      - Aft deck:   25.00 %,  11.81 ft / 3.60 m,  11.81 ft / 3.60 m
      - Quarter deck:   15.00 %,  11.81 ft / 3.60 m,  11.81 ft / 3.60 m
      - Average freeboard:      16.85 ft / 5.14 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 87.1 %
      - Above water (accommodation/working, high = better): 127.3 %
   Waterplane Area: 5,937 Square feet or 552 Square metres
   Displacement factor (Displacement / loading): 131 %
   Structure weight / hull surface area: 65 lbs/sq ft or 316 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 1.08
      - Longitudinal: 9.49
      - Overall: 1.34
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

12.61 kts astern from single forward-facing 1,000 kw shaft
18.63 kts ahead from two 2,500 kw shafts

[The Rock Doctor]

A high-speed ferry for transporting troops across the Baltic.  Notionally, one can move troops between Scandinavia and "mainland" Europe either through Denmark or through not-Russia and Finland - but if one route is cut off by enemy action, the other requires a pretty long, circuitous route to get stuff there. 

A few fast ferries allow for another option, direct routing through the Baltic, say from Riga to Stockholm or such.  If both land routes are active, great - the ferries can reduce the need to move soldiers and light gear by rail.  If not, great - the ferries can cross the Baltic in a matter of hours and allow rapid troop redeployments to meet Northern Kingdom or Golden Horde aggression in particular.

Similar craft might offer utility in external territories, but I haven't checked distances yet.  A heavier defensive armament might be necessary there since their waters aren't a Union lake like the Baltic is.

The armament is mostly about shore security; the single big gun is there primarily in case an enemy submarine manages to get into the Baltic and make a nuisance of itself.


Enter ship name, Enter country Enter ship type laid down 1922

Displacement:
   2,419 t light; 2,477 t standard; 2,643 t normal; 2,775 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (325.69 ft / 318.24 ft) x 49.21 ft x (9.84 / 10.25 ft)
   (99.27 m / 97.00 m) x 15.00 m  x (3.00 / 3.12 m)

Armament:
      1 - 3.94" / 100 mm 45.0 cal gun - 30.77lbs / 13.96kg shells, 150 per gun
     Quick firing gun in deck mount, 1922 Model
     1 x Single mount on centreline, aft deck centre
      1 raised mount aft
      4 - 0.39" / 10.0 mm 45.0 cal guns - 0.03lbs / 0.01kg shells, 40,000 per gun
     Machine guns in deck mounts, 1922 Model
     4 x Single mounts on sides, evenly spread
      4 raised mounts
      Weight of broadside 31 lbs / 14 kg

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

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 9,383 shp / 7,000 Kw = 20.67 kts
   Range 1,000nm at 20.00 kts
   Bunker at max displacement = 297 tons

Complement:
   183 - 239

Cost:
   £0.357 million / $1.427 million

Distribution of weights at normal displacement:
   Armament: 6 tons, 0.2 %
      - Guns: 6 tons, 0.2 %
   Armour: 1 tons, 0.0 %
      - Armament: 1 tons, 0.0 %
   Machinery: 318 tons, 12.0 %
   Hull, fittings & equipment: 1,054 tons, 39.9 %
   Fuel, ammunition & stores: 223 tons, 8.4 %
   Miscellaneous weights: 1,040 tons, 39.4 %
      - Hull below water: 100 tons
      - Hull above water: 300 tons
      - On freeboard deck: 500 tons
      - Above deck: 140 tons

Fittings:
-640 t:  Short-term accommodation for ~2,000 troops (mix of AD, FD and AW)
-300 t:  Cargo/vehicle/working animal space (FD)
-100 t:  Bulk cargo (BW)

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     8,587 lbs / 3,895 Kg = 281.4 x 3.9 " / 100 mm shells or 2.1 torpedoes
   Stability (Unstable if below 1.00): 1.18
   Metacentric height 2.3 ft / 0.7 m
   Roll period: 13.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 90 %
         - Recoil effect (Restricted arc if above 1.00): 0.02
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.600 / 0.605
   Length to Beam Ratio: 6.47 : 1
   'Natural speed' for length: 17.84 kts
   Power going to wave formation at top speed: 55 %
   Trim (Max stability = 0, Max steadiness = 100): 45
   Bow angle (Positive = bow angles forward): 10.00 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,  19.69 ft / 6.00 m
      - Forward deck:   30.00 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
      - Aft deck:   35.00 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
      - Quarter deck:   15.00 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
      - Average freeboard:      20.00 ft / 6.10 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 57.4 %
      - Above water (accommodation/working, high = better): 234.7 %
   Waterplane Area: 11,455 Square feet or 1,064 Square metres
   Displacement factor (Displacement / loading): 156 %
   Structure weight / hull surface area: 57 lbs/sq ft or 277 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.86
      - Longitudinal: 3.93
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

[The Rock Doctor]

A train ferry, not so much because I have a desperate need for them but because it's an excuse to draw trains and ships at the same time.

Although they would also offer utility in the Baltic for the same reason as the troop ferry would.

I've simmed most of the miscellaneous weight as "above water", rather than "freeboard deck" given that historical photos show solid sides at least partway above the rail deck.  Putting it all on the freeboard deck does not actually make a huge difference to seakeeping or stability, though.  The beam would - judging from pics of the historical Train Ferry #3, allow for four sets of parallel standard gauge tracks of around 250-300 feet length each.  The bow is fully enclosed; the ship would back in to the pier and load/unload from the quarterdeck.

This seems like a good case for a nice diesel/electric drive, so one is fitted.  It would take less than half a day to cross from Stockholm to Riga, as an example, and not require fueling after each trip.

Obviously such ships would be built to mercantile standards, assuming I build them at all.


Enter ship name, Enter country Enter ship type laid down 1921

Displacement:
   3,133 t light; 3,198 t standard; 3,230 t normal; 3,256 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (327.79 ft / 324.15 ft) x 59.06 ft x (7.87 / 7.93 ft)
   (99.91 m / 98.80 m) x 18.00 m x (2.40 / 2.42 m)

Machinery:
   Diesel Internal combustion generators,
   Electric motors, 2 shafts, 2,681 shp / 2,000 Kw = 13.90 kts
   Range 500nm at 10.00 kts (950nm factoring in diesel/electric propulsion)
   Bunker at max displacement = 58 tons

Complement:
   213 - 278

Cost:
   £0.312 million / $1.248 million

Distribution of weights at normal displacement:
   Armament: 0 tons, 0.0 %
   Machinery: 92 tons, 2.9 %
   Hull, fittings & equipment: 1,240 tons, 38.4 %
   Fuel, ammunition & stores: 97 tons, 3.0 %
   Miscellaneous weights: 1,801 tons, 55.8 %
      - Hull below water: 51 tons
      - Hull above water: 1,350 tons
      - On freeboard deck: 400 tons

Fittings:
-51 t:  Diesel/electric drive (BW)
-150 t:  Tracks and carriage securing stuff (AW)
-1,600 t:  Cargo (mostly AW)

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     11,869 lbs / 5,384 Kg = 109.9 x 6 " / 152 mm shells or 2.5 torpedoes
   Stability (Unstable if below 1.00): 1.45
   Metacentric height 4.3 ft / 1.3 m
   Roll period: 12.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 80 %
         - Recoil effect (Restricted arc if above 1.00): 0.00
   Seaboat quality  (Average = 1.00): 1.83

Hull form characteristics:
   Hull has low quarterdeck ,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.750 / 0.751
   Length to Beam Ratio: 5.49 : 1
   'Natural speed' for length: 18.00 kts
   Power going to wave formation at top speed: 35 %
   Trim (Max stability = 0, Max steadiness = 100): 44
   Bow angle (Positive = bow angles forward): 10.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   10.00 %,  20.67 ft / 6.30 m,  17.72 ft / 5.40 m
      - Forward deck:   30.00 %,  17.72 ft / 5.40 m,  17.72 ft / 5.40 m
      - Aft deck:   50.00 %,  17.72 ft / 5.40 m,  17.72 ft / 5.40 m
      - Quarter deck:   10.00 %,  9.84 ft / 3.00 m,  9.84 ft / 3.00 m
      - Average freeboard:      17.05 ft / 5.20 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 57.4 %
      - Above water (accommodation/working, high = better): 254.0 %
   Waterplane Area: 16,034 Square feet or 1,490 Square metres
   Displacement factor (Displacement / loading): 163 %
   Structure weight / hull surface area: 61 lbs/sq ft or 296 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.93
      - Longitudinal: 1.93
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, rides out heavy weather easily

[Kaiser Kirk]

A train ferry, not so much because I have a desperate need for them but because it's an excuse to draw trains and ships at the same time.

ok that got a chuckle :)

[Desertfox]

And now I want one just because, not that I actually need it.

[TacCovert4]

And now I want one just because, not that I actually need it.

Trans-Pacific Railways......

[The Rock Doctor]

I mean he has all sorts of archipelagos in his dastardly empire.

[The Rock Doctor]

As speculated a few years back, the royal family would like a new and improved ocean-going yacht for service outside the Baltic.

The ship makes use of diesel engines and geared drive for an effective cruising range at good speed; she could steam from Amsterdam to Nieupoort in 8.5 days at 20 knots, as an example.

There are four guns for saluting, and six machine gun installations for security purposes.  The conning tower represents a "safe room" for VIPs. 

The yacht has extensive living, entertaining, and working space for the royal family and retinue.  There is also a multi-level and fairly palatial set of accommodations for a second VIP - such as the Prime Minister or a foreign dignitary and retinue - that can be isolated for security purposes if required.  Ten staterooms for other guests are also included.

Notionally the ship could be converted to a hospital ship in times of war but I've not worked up the distribution of miscellaneous weight in that scenario.

Contrary to earlier statements, I'd build this to mercantile standards, not milspec.



Enter ship name, Enter country Enter ship type laid down 1921

Displacement:
   3,752 t light; 3,841 t standard; 4,323 t normal; 4,708 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (380.35 ft / 367.45 ft) x 55.77 ft x (14.76 / 15.75 ft)
   (115.93 m / 112.00 m) x 17.00 m  x (4.50 / 4.80 m)

Armament:
      4 - 1.97" / 50.0 mm 45.0 cal guns - 3.85lbs / 1.74kg shells, 150 per gun
     Quick firing guns in deck mounts, 1921 Model
     4 x Single mounts on sides, aft evenly spread
      4 raised mounts
      6 - 0.39" / 10.0 mm 45.0 cal guns - 0.03lbs / 0.01kg shells, 4,000 per gun
     Breech loading guns in deck mounts, 1921 Model
     6 x Single mounts on sides, evenly spread
      6 raised mounts
      Weight of broadside 16 lbs / 7 kg

Armour:
   - Conning towers: Forward 5.91" / 150 mm, Aft 0.00" / 0 mm

Machinery:
   Diesel Internal combustion motors,
   Geared drive, 2 shafts, 13,405 shp / 10,000 Kw = 21.63 kts
   Range 2,500nm at 20.00 kts
   Bunker at max displacement = 868 tons

Complement:
   266 - 346

Cost:
   £0.501 million / $2.005 million

Distribution of weights at normal displacement:
   Armament: 4 tons, 0.1 %
      - Guns: 4 tons, 0.1 %
   Armour: 34 tons, 0.8 %
      - Conning Tower: 34 tons, 0.8 %
   Machinery: 462 tons, 10.7 %
   Hull, fittings & equipment: 1,474 tons, 34.1 %
   Fuel, ammunition & stores: 570 tons, 13.2 %
   Miscellaneous weights: 1,780 tons, 41.2 %
      - Hull below water: 420 tons
      - Hull above water: 400 tons
      - On freeboard deck: 600 tons
      - Above deck: 360 tons

Fittings:
-25 t:  L/R wireless (AD)
-100 t:  Royal Suite (AD)
-175 t:  Main dining/meeting space (AD)
-60 t:  Primary guest suite (AD)
-100 t:  Ten staterooms (guests) (FD)
-126 t:  Accommodation and working space for 7 senior & 14 junior aides (guests) (FD)
-150 t:  Accommodation and working space for 15 senior/intermediate aides (FD)
-274 t:  Main entertainment space (FD)
-400 t:  Accommodation and working space for 100 junior aides (AW)
-281 t:  Cargo and vehicle hold (BW)
-139 t:  Diesel machinery (BW)

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     11,284 lbs / 5,118 Kg = 2,958.7 x 2.0 " / 50 mm shells or 2.4 torpedoes
   Stability (Unstable if below 1.00): 1.14
   Metacentric height 2.7 ft / 0.8 m
   Roll period: 14.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 100 %
         - Recoil effect (Restricted arc if above 1.00): 0.01
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.500 / 0.510
   Length to Beam Ratio: 6.59 : 1
   'Natural speed' for length: 19.17 kts
   Power going to wave formation at top speed: 53 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 3.94 ft / 1.20 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   25.00 %,  24.61 ft / 7.50 m,  19.69 ft / 6.00 m
      - Forward deck:   30.00 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
      - Aft deck:   30.00 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
      - Quarter deck:   15.00 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
      - Average freeboard:      20.18 ft / 6.15 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 56.6 %
      - Above water (accommodation/working, high = better): 192.5 %
   Waterplane Area: 13,655 Square feet or 1,269 Square metres
   Displacement factor (Displacement / loading): 157 %
   Structure weight / hull surface area: 67 lbs/sq ft or 328 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.89
      - Longitudinal: 2.89
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

2500@20 --> 4,600 w/diesel and geared drive
3300@18 --> 6,100 w/diesel and geared drive
5400@15 --> 9,900 w/diesel and geared drive