Auxiliary Ships (特設艦)

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Aikoku Maru Class (愛国丸型) Collier
The Aikoku Maru colliers were Japan's first purpose made colliers. They were built in order to aid the Japanese Admiralty handle the newly acquired and distant lands of the Philippines, Solomon Islands, and various tiny pacific enclaves.

「愛国丸」は日本第一海軍の補給艦。この型艦は、日本海軍がフィリピン、ソロモン諸島、および様々な平洋諸島を扱う助けるために建設された。

01 - Aikoku Maru (愛国丸), laid down 1900
02 - Atago Maru  (愛宕丸), laid down 1901
03 - Awa Maru (阿波), laid down 1902
04 - Chichibu Maru (秩父丸), laid down 1902
05 - Hitachi Maru (常陸丸), laid down 1903
06 - Kaiwo Maru (海王丸), laid down 1903
07 - Nana Maru (南阿丸), laid down 1903
08 - Nagata Maru (長田丸), laid down 1903
09 - Toyama Maru (富山丸), laid down 1904
10 - Tsushima Maru (対馬丸), laid down 1904

Aikoku Maru, Japan Collier laid down 1900

Displacement:
   4,000 t light; 4,111 t standard; 5,572 t normal; 6,741 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (229.66 ft / 229.66 ft) x 36.09 ft x (26.25 / 31.38 ft)
   (70.00 m / 70.00 m) x 11.00 m  x (8.00 / 9.56 m)

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 2,039 ihp / 1,521 Kw = 12.00 kts
   Range 15,000nm at 10.00 kts
   Bunker at max displacement = 2,629 tons (100% coal)

Complement:
   322 - 419

Cost:
   £0.185 million / $0.738 million

Distribution of weights at normal displacement:
   Armament: 0 tons, 0.0 %
   Machinery: 319 tons, 5.7 %
   Hull, fittings & equipment: 681 tons, 12.2 %
   Fuel, ammunition & stores: 1,572 tons, 28.2 %
   Miscellaneous weights: 3,000 tons, 53.8 %
      - Hull below water: 3,000 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     5,358 lbs / 2,430 Kg = 49.6 x 6 " / 152 mm shells or 1.2 torpedoes
   Stability (Unstable if below 1.00): 1.40
   Metacentric height 2.0 ft / 0.6 m
   Roll period: 10.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 90 %
         - Recoil effect (Restricted arc if above 1.00): 0.00
   Seaboat quality  (Average = 1.00): 1.41

Hull form characteristics:
   Hull has raised quarterdeck ,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.896 / 0.907
   Length to Beam Ratio: 6.36 : 1
   'Natural speed' for length: 15.15 kts
   Power going to wave formation at top speed: 47 %
   Trim (Max stability = 0, Max steadiness = 100): 64
   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:   20.00 %,  6.56 ft / 2.00 m,  6.56 ft / 2.00 m
      - Forward deck:   30.00 %,  6.56 ft / 2.00 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 %,  14.44 ft / 4.40 m,  14.44 ft / 4.40 m
      - Average freeboard:      7.74 ft / 2.36 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 77.7 %
      - Above water (accommodation/working, high = better): 30.9 %
   Waterplane Area: 7,967 Square feet or 740 Square metres
   Displacement factor (Displacement / loading): 153 %
   Structure weight / hull surface area: 52 lbs/sq ft or 255 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.91
      - Longitudinal: 2.28
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Extremely poor accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

Hull bellow water: 3,000t
- 3,000t, Coal

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Wakamiya Class (若宮型) Troop Transport
The Wakamiya transport was made to ferry troops between the Japan's core territories and various islands controlled in the Pacific. The ship would first be used in the Japan's 1st African Expedition.

01 - Wakamiya (若宮), laid down 1902
02 - Sei-Kyo Maru (西京丸), laid down 1902
03 - Hikawa Maru (氷川丸), laid down 1902
04 - Hiye Maru (日枝丸), laid down 1902
05 - Heian Maru (平安丸), laid down 1902
06 - Yoshida Maru (吉田丸), laid down 1904
07 - Tatsuta Maru (龍田丸), laid down 1904
08 - Kuroshio Maru (黒潮丸), laid down 1904

Wakamiya (若宮), Japan Troop Transport laid down 1900

Displacement:
   8,000 t light; 8,208 t standard; 10,205 t normal; 11,803 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (328.08 ft / 328.08 ft) x 56.43 ft x (29.53 / 33.46 ft)
   (100.00 m / 100.00 m) x 17.20 m  x (9.00 / 10.20 m)

Armament:
      1 - 2.95" / 75.0 mm 45.0 cal gun - 12.98lbs / 5.89kg shells, 450 per gun
     Breech loading gun in deck mount, 1900 Model
     1 x Single mount on centreline, forward deck forward
      Weight of broadside 13 lbs / 6 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.20" / 5 mm         -               -

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 5,983 ihp / 4,463 Kw = 15.00 kts
   Range 15,000nm at 10.00 kts
   Bunker at max displacement = 3,595 tons (100% coal)

Complement:
   506 - 659

Cost:
   £0.412 million / $1.646 million

Distribution of weights at normal displacement:
   Armament: 2 tons, 0.0 %
      - Guns: 2 tons, 0.0 %
   Armour: 0 tons, 0.0 %
      - Armament: 0 tons, 0.0 %
   Machinery: 935 tons, 9.2 %
   Hull, fittings & equipment: 2,063 tons, 20.2 %
   Fuel, ammunition & stores: 2,205 tons, 21.6 %
   Miscellaneous weights: 5,000 tons, 49.0 %
      - Hull above water: 5,000 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     12,109 lbs / 5,492 Kg = 940.7 x 3.0 " / 75 mm shells or 1.7 torpedoes
   Stability (Unstable if below 1.00): 1.08
   Metacentric height 2.5 ft / 0.8 m
   Roll period: 15.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.00
   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): 0.653 / 0.667
   Length to Beam Ratio: 5.81 : 1
   'Natural speed' for length: 18.11 kts
   Power going to wave formation at top speed: 45 %
   Trim (Max stability = 0, Max steadiness = 100): 35
   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:   20.00 %,  22.97 ft / 7.00 m,  22.97 ft / 7.00 m
      - Forward deck:   30.00 %,  22.97 ft / 7.00 m,  22.97 ft / 7.00 m
      - Aft deck:   30.00 %,  22.97 ft / 7.00 m,  22.97 ft / 7.00 m
      - Quarter deck:   20.00 %,  22.97 ft / 7.00 m,  22.97 ft / 7.00 m
      - Average freeboard:      22.97 ft / 7.00 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 83.6 %
      - Above water (accommodation/working, high = better): 123.0 %
   Waterplane Area: 14,227 Square feet or 1,322 Square metres
   Displacement factor (Displacement / loading): 148 %
   Structure weight / hull surface area: 76 lbs/sq ft or 369 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.83
      - Longitudinal: 5.29
      - Overall: 1.00
   Adequate 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

Hull above water: 5000t
- 5000t, 2,500 Troops on Long-term transport or 5,000 Troops on Short-term transport

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Miho Class (三保型) Tender

Laid down in 1900, budget shortfalls meant that it would only be completed in 1903, a year behind the original schedule. Despite the delay however, the IJN Miho is still by far the largest tender in the world. The Miho was ordered by the Imperial Japanese Navy as a means to supply and repair ships in the wide Pacific region where the islands were too small for Japan to feasibly build a Port.

She has 12,011t worth of Tender Facilities without compromising Bunkerage and can serve as port for 48,044t of shipping - larger than a Type 1 Port. The Miho can also conduct refurbishments, overhauls, basic refits, and basic repairs.

01 - Miho (三保), laid down 1900

Miho (三保), Japan Tender laid down 1900

Displacement:
   16,000 t light; 16,369 t standard; 18,122 t normal; 19,525 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (393.70 ft / 393.70 ft) x 65.62 ft x (29.53 / 31.63 ft)
   (120.00 m / 120.00 m) x 20.00 m  x (9.00 / 9.64 m)

Armament:
      2 - 2.95" / 75.0 mm 45.0 cal guns - 12.98lbs / 5.89kg shells, 450 per gun
     Breech loading guns in deck mounts, 1900 Model
     2 x Single mounts on centreline, evenly spread
      Weight of broadside 26 lbs / 12 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.20" / 5 mm         -               -

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 8,424 ihp / 6,285 Kw = 15.00 kts
   Range 9,000nm at 10.00 kts
   Bunker at max displacement = 3,156 tons (100% coal)

Complement:
   780 - 1,015

Cost:
   £0.746 million / $2.982 million

Distribution of weights at normal displacement:
   Armament: 4 tons, 0.0 %
      - Guns: 4 tons, 0.0 %
   Armour: 1 tons, 0.0 %
      - Armament: 1 tons, 0.0 %
   Machinery: 1,316 tons, 7.3 %
   Hull, fittings & equipment: 2,667 tons, 14.7 %
   Fuel, ammunition & stores: 2,122 tons, 11.7 %
   Miscellaneous weights: 12,011 tons, 66.3 %
      - Hull below water: 3,000 tons
      - Hull above water: 7,000 tons
      - On freeboard deck: 2,011 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     15,348 lbs / 6,962 Kg = 1,192.3 x 3.0 " / 75 mm shells or 2.0 torpedoes
   Stability (Unstable if below 1.00): 1.10
   Metacentric height 3.2 ft / 1.0 m
   Roll period: 15.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 51 %
         - Recoil effect (Restricted arc if above 1.00): 0.00
   Seaboat quality  (Average = 1.00): 1.21

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.832 / 0.836
   Length to Beam Ratio: 6.00 : 1
   'Natural speed' for length: 19.84 kts
   Power going to wave formation at top speed: 43 %
   Trim (Max stability = 0, Max steadiness = 100): 42
   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:   20.00 %,  9.84 ft / 3.00 m,  9.84 ft / 3.00 m
      - Forward deck:   30.00 %,  9.84 ft / 3.00 m,  9.84 ft / 3.00 m
      - Aft deck:   30.00 %,  9.84 ft / 3.00 m,  9.84 ft / 3.00 m
      - Quarter deck:   20.00 %,  9.84 ft / 3.00 m,  9.84 ft / 3.00 m
      - Average freeboard:      9.84 ft / 3.00 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 84.1 %
      - Above water (accommodation/working, high = better): 56.3 %
   Waterplane Area: 23,407 Square feet or 2,175 Square metres
   Displacement factor (Displacement / loading): 124 %
   Structure weight / hull surface area: 83 lbs/sq ft or 403 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.97
      - Longitudinal: 1.25
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Cramped accommodation and workspace room
   Good seaboat, rides out heavy weather easily

Hull below water: 3000t
Hull above water: 7000t
On deck: 2011t

Total: 12011t worth of Tender Facilities, enough to undertake refurbishments as well as overhauls, basic refits, and basic repairs.