Vesontio Class Seaplane Tender

[snip]

One Ship
--IRS Vesontio

IRS Vesontio, Imperial Roman Republic Seaplane Carrier Conversion laid down 1904

Displacement:
   5,048 t light; 5,209 t standard; 5,847 t normal; 6,357 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (364.17 ft / 360.89 ft) x 54.13 ft x (20.51 / 21.86 ft)
   (111.00 m / 110.00 m) x 16.50 m  x (6.25 / 6.66 m)

Armament:
      4 - 5.51" / 140 mm 55.0 cal guns - 85.98lbs / 39.00kg shells, 200 per gun
     Quick firing guns in deck and hoist mounts, 1909 Model
     2 x Twin mounts on centreline, forward deck forward
      2 raised mounts
      1 - 3.94" / 100 mm 45.0 cal gun - 30.86lbs / 14.00kg shells, 350 per gun
     Quick firing gun in deck and hoist mount, 1915 Model
     1 x Single mount on centreline, forward deck aft
      1 raised mount
      4 - 0.26" / 6.5 mm 110.0 cal guns - 0.01lbs / 0.00kg shells, 15,000 per gun
     Machine guns in deck mounts, 1911 Model
     4 x Single mounts on sides, evenly spread
      4 raised mounts
      Weight of broadside 375 lbs / 170 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.57" / 40 mm   0.39" / 10 mm      1.57" / 40 mm
   2nd:   0.59" / 15 mm         -         1.57" / 40 mm
   3rd:   0.20" / 5 mm         -               -

   - Protected deck - single deck:
   For and Aft decks: 1.18" / 30 mm
   Forecastle: 1.18" / 30 mm  Quarter deck: 1.18" / 30 mm

   - Conning towers: Forward 2.95" / 75 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 26,505 shp / 19,773 Kw = 24.40 kts
   Range 3,339nm at 14.00 kts
   Bunker at max displacement = 1,148 tons

Complement:
   333 - 434

Cost:
   £0.559 million / $2.236 million

Distribution of weights at normal displacement:
   Armament: 104 tons, 1.8 %
      - Guns: 104 tons, 1.8 %
   Armour: 324 tons, 5.5 %
      - Armament: 14 tons, 0.2 %
      - Armour Deck: 290 tons, 5.0 %
      - Conning Tower: 21 tons, 0.4 %
   Machinery: 2,410 tons, 41.2 %
   Hull, fittings & equipment: 1,595 tons, 27.3 %
   Fuel, ammunition & stores: 799 tons, 13.7 %
   Miscellaneous weights: 615 tons, 10.5 %
      - Hull below water: 200 tons
      - Hull above water: 200 tons
      - On freeboard deck: 200 tons
      - Above deck: 15 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     3,094 lbs / 1,404 Kg = 37.0 x 5.5 " / 140 mm shells or 0.7 torpedoes
   Stability (Unstable if below 1.00): 1.34
   Metacentric height 3.4 ft / 1.0 m
   Roll period: 12.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.16
   Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
   Hull has low quarterdeck ,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.511 / 0.521
   Length to Beam Ratio: 6.67 : 1
   'Natural speed' for length: 19.00 kts
   Power going to wave formation at top speed: 61 %
   Trim (Max stability = 0, Max steadiness = 100): 69
   Bow angle (Positive = bow angles forward): 10.00 degrees
   Stern overhang: 0.52 ft / 0.16 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  15.58 ft / 4.75 m,  15.58 ft / 4.75 m
      - Forward deck:   30.00 %,  15.58 ft / 4.75 m,  15.58 ft / 4.75 m
      - Aft deck:   35.00 %,  15.58 ft / 4.75 m,  15.58 ft / 4.75 m
      - Quarter deck:   15.00 %,  6.56 ft / 2.00 m,  6.56 ft / 2.00 m
      - Average freeboard:      14.23 ft / 4.34 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 148.0 %
      - Above water (accommodation/working, high = better): 117.2 %
   Waterplane Area: 13,147 Square feet or 1,221 Square metres
   Displacement factor (Displacement / loading): 95 %
   Structure weight / hull surface area: 80 lbs/sq ft or 391 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.92
      - Longitudinal: 2.13
      - Overall: 1.00
   Cramped machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

---Fire Control (11t)
---LR Wireless (25t)
---Backup SR Wireless (10t)
---Improved Signaling Equipment (15t Above Water)
---Reserve (4t)
---3 Multi-Engine Seaplanes (495t)
---Additional Support Equpment for Seaplanes and crew (55t)