Japanese Ship Designs 1915+

[Desertfox]

https://www.navalism.org/index.php/topic,7400.0.html

And we could use a Norse player...

[The Rock Doctor]

I'd call it over-armed and too slow if its duties are in any way offensive, such as blockade-running.

[The Rock Doctor]

https://www.navalism.org/index.php/topic,7400.0.html

And we could use a Norse player...

For sure.

[Desertfox]

It would primarily be a multi-purpose colonial gunboat. Show the flag, deal with pirates/locals, do some raiding, tangle with light forces, lay defensive minefields, etc. Basically a cheap cruiser.

[The Rock Doctor]

Okay, so more defensive in nature.

[Desertfox]

I have lots of zeppelins and lots of islands. So I need something like the USS Patoka (AO-9). The MTBs provide support for mooring operations.



Kamikawa Maru class, Japan Zeppelin Tender laid down 1917

Displacement:
   9,310 t light; 9,546 t standard; 10,569 t normal; 11,388 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (442.47 ft / 440.00 ft) x 59.00 ft x (25.00 / 26.55 ft)
   (134.86 m / 134.11 m) x 17.98 m  x (7.62 / 8.09 m)

Armament:
      2 - 6.00" / 152 mm 45.0 cal guns - 108.92lbs / 49.41kg shells, 150 per gun
     Quick firing guns in deck and hoist mounts, 1917 Model
     2 x Single mounts on centreline ends, evenly spread
      12 - 2.00" / 50.8 mm 45.0 cal guns - 4.03lbs / 1.83kg shells, 250 per gun
     Breech loading guns in deck mounts, 1917 Model
     4 x Triple mounts on sides, evenly spread
      Weight of broadside 266 lbs / 121 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.00" / 25 mm         -         1.00" / 25 mm

Machinery:
   Oil fired boilers, steam turbines,
   Electric motors, 2 shafts, 8,807 shp / 6,570 Kw = 17.00 kts
   Range 7,300nm at 14.00 kts
   Bunker at max displacement = 1,842 tons

Complement:
   520 - 677

Cost:
   £0.717 million / $2.868 million

Distribution of weights at normal displacement:
   Armament: 66 tons, 0.6 %
      - Guns: 66 tons, 0.6 %
   Armour: 6 tons, 0.1 %
      - Armament: 6 tons, 0.1 %
   Machinery: 323 tons, 3.1 %
   Hull, fittings & equipment: 2,166 tons, 20.5 %
   Fuel, ammunition & stores: 1,259 tons, 11.9 %
   Miscellaneous weights: 6,750 tons, 63.9 %
      - Hull below water: 5,090 tons
      - Hull above water: 1,400 tons
      - On freeboard deck: 160 tons
      - Above deck: 100 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     13,425 lbs / 6,090 Kg = 124.3 x 6.0 " / 152 mm shells or 1.9 torpedoes
   Stability (Unstable if below 1.00): 1.59
   Metacentric height 4.9 ft / 1.5 m
   Roll period: 11.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.03
   Seaboat quality  (Average = 1.00): 1.52

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.570 / 0.578
   Length to Beam Ratio: 7.46 : 1
   'Natural speed' for length: 20.98 kts
   Power going to wave formation at top speed: 37 %
   Trim (Max stability = 0, Max steadiness = 100): 46
   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:   30.00 %,  14.00 ft / 4.27 m,  12.00 ft / 3.66 m
      - Forward deck:   30.00 %,  12.00 ft / 3.66 m,  12.00 ft / 3.66 m
      - Aft deck:   25.00 %,  12.00 ft / 3.66 m,  12.00 ft / 3.66 m
      - Quarter deck:   15.00 %,  12.00 ft / 3.66 m,  12.00 ft / 3.66 m
      - Average freeboard:      12.24 ft / 3.73 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 79.2 %
      - Above water (accommodation/working, high = better): 81.1 %
   Waterplane Area: 18,460 Square feet or 1,715 Square metres
   Displacement factor (Displacement / loading): 139 %
   Structure weight / hull surface area: 79 lbs/sq ft or 384 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.97
      - Longitudinal: 1.26
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Cramped 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

100t - LR Wireless, FC, C&C facilities
160t - 4 x 20t MTBs
6,400t - Aviation Point (Zeppelin) Support
90t - Electric Drive (increased subdivisions)

[TacCovert4]

Eh, looks about right.  And the mtbs still keep it under 2%, so they should be combat deployable as escorts. 

[Jefgte]

If these ships have to work with the fleet, they are too slow.
Byzantium, which has many surveillance Zeppelins, is considering a speed of 24 kts for Zeppelin tenders.

[TacCovert4]

When I get there 24 to 27kts will probably be my zepp tender speed if I do one.  My fleet train does 24kts.

[Desertfox]

Japanese doctrine is to find a suitable anchorage and operate from there, hence why most of my auxiliaries are a lot slower and not designed to operate with the fleet.

[Desertfox]

I just realized, 1) I probably shouldn't jump straight to full tender support ship, 2) I have a Jingei class aux with no job just sitting around. So the Jingei (sub transport version) will be refitted with a zeppelin mooring mast and supplies, get a defensive armament upgrade, and a rearrangement of her boat transport capabilities. She carries 6 boats (4x40t and 2x20t) to provide security at the anchorage and assist with the mooring process.

Jingei (Z), Japan Zeppelin Tender laid down 1913

Displacement:
   2,095 t light; 2,158 t standard; 2,370 t normal; 2,539 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (300.00 ft / 300.00 ft) x 50.00 ft x (9.70 / 10.26 ft)
   (91.44 m / 91.44 m) x 15.24 m  x (2.96 / 3.13 m)

Armament:
      2 - 5.00" / 127 mm 45.0 cal guns - 63.03lbs / 28.59kg shells, 100 per gun
     Breech loading guns in deck mounts, 1913 Model
     2 x Single mounts on centreline ends, evenly spread
      12 - 2.00" / 50.8 mm 45.0 cal guns - 4.03lbs / 1.83kg shells, 300 per gun
     Breech loading guns in deck mounts, 1913 Model
     4 x Triple mounts on sides, evenly spread
      Weight of broadside 174 lbs / 79 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.10" / 3 mm         -               -

Machinery:
   Coal and oil fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 2,009 ihp / 1,498 Kw = 14.00 kts
   Range 5,000nm at 10.00 kts
   Bunker at max displacement = 381 tons (50% coal)

Complement:
   169 - 220

Cost:
   £0.109 million / $0.435 million

Distribution of weights at normal displacement:
   Armament: 27 tons, 1.1 %
      - Guns: 27 tons, 1.1 %
   Armour: 1 tons, 0.0 %
      - Armament: 1 tons, 0.0 %
   Machinery: 126 tons, 5.3 %
   Hull, fittings & equipment: 662 tons, 27.9 %
   Fuel, ammunition & stores: 274 tons, 11.6 %
   Miscellaneous weights: 1,280 tons, 54.0 %
      - Hull below water: 400 tons
      - Hull above water: 50 tons
      - On freeboard deck: 800 tons
      - Above deck: 30 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     6,256 lbs / 2,838 Kg = 100.1 x 5.0 " / 127 mm shells or 2.6 torpedoes
   Stability (Unstable if below 1.00): 1.43
   Metacentric height 3.3 ft / 1.0 m
   Roll period: 11.6 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.02
   Seaboat quality  (Average = 1.00): 1.49

Hull form characteristics:
   Hull has raised forecastle, raised quarterdeck ,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.570 / 0.578
   Length to Beam Ratio: 6.00 : 1
   'Natural speed' for length: 17.32 kts
   Power going to wave formation at top speed: 36 %
   Trim (Max stability = 0, Max steadiness = 100): 47
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   25.00 %,  15.00 ft / 4.57 m,  14.00 ft / 4.27 m
      - Forward deck:   30.00 %,  7.00 ft / 2.13 m,  7.00 ft / 2.13 m
      - Aft deck:   20.00 %,  7.00 ft / 2.13 m,  7.00 ft / 2.13 m
      - Quarter deck:   25.00 %,  14.00 ft / 4.27 m,  14.00 ft / 4.27 m
      - Average freeboard:      10.60 ft / 3.23 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 43.0 %
      - Above water (accommodation/working, high = better): 84.2 %
   Waterplane Area: 10,667 Square feet or 991 Square metres
   Displacement factor (Displacement / loading): 147 %
   Structure weight / hull surface area: 50 lbs/sq ft or 243 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.99
      - Longitudinal: 1.11
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Cramped accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

30t - LR wireless + FC
50t - 20 Marines + camouflauge
400t - Mast and mooring equippment for 1 Zeppelin
400t - Cranes and space for up to 4 x 40t MTB/Boats and 2 x 20t MTB/Boats
300t - 3,000t of Out-of-port resupply
100t - Zeppelin support supplies

[Desertfox]

First shot at drawing it. I really should convince Rocky that Wilno needs a AOR Pakota equivalent... Zeppelin is not accurate but to the right scale (520ft) but probably a tad fat.

[The Rock Doctor]

I've always found cold, hard cash pretty convincing.

[The Rock Doctor]

Actually, I feel like I did draw one for N3.

[The Rock Doctor]

INDEED