Tokka class (Octavia)

Tokka Class SPQO:Navy Aviso/Sloop laid down 1904

727 t light; 756 t standard; 855 t normal; 934 t full load

(57.70 m / 55.00 m) x 7.00 m  x (4.00 / 4.29 m)

## Armament:

      3 - 4.02" / 102 mm 45.0 cal guns - 32.65lbs / 14.81kg shells, 150 per gun

  Quick firing guns in deck mounts, 1900 Model

  1 x Single mount on centreline, forward deck forward

  2 x Single mounts on centreline, aft evenly spread

      4 - 2.24" / 57.0 mm 39.0 cal guns - 5.39lbs / 2.44kg shells, 300 per gun

  Quick firing guns in deck mounts, 1900 Model

  4 x 2-gun mounts on sides, aft deck forward

      4 - 0.30" / 7.5 mm 45.0 cal guns - 0.01lbs / 0.01kg shells, 2,000 per gun

  Machine guns in deck mounts, 1904 Model

  1 x 2-gun mount on sides, aft deck forward

  1 x 2-gun mount on sides, forward deck aft

      Weight of broadside 120 lbs / 54 kg

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)

Main: 1.57" / 40 mm 2.24" / 57 mm       -

2nd: 1.18" / 30 mm       -       -

Forecastle: 0.91" / 23 mm  Quarter deck: 0.91" / 23 mm

## Machinery:

Coal fired boilers, steam turbines,

Direct drive, 2 shafts, 3,295 shp / 2,458 Kw = 18.20 kts

Range 2,500nm at 10.00 kts

Bunker at max displacement = 178 tons (100% coal)

## Complement:

78 - 102

£0.077 million / $0.307 million

   - Guns: 21 tons, 2.5 %

Armour: 132 tons, 15.4 %

   - Armament: 50 tons, 5.9 %

   - Armour Deck: 82 tons, 9.6 %

Machinery: 326 tons, 38.1 %

Hull, fittings & equipment: 227 tons, 26.6 %

Fuel, ammunition & stores: 128 tons, 14.9 %

Miscellaneous weights: 21 tons, 2.5 %

   - Hull below water: 5 tons

   - Hull above water: 8 tons

   - On freeboard deck: 6 tons

   - Above deck: 2 tons

  561 lbs / 255 Kg = 17.3 x 4.0 " / 102 mm shells or 0.3 torpedoes

Stability (Unstable if below 1.00): 1.29

Metacentric height 0.9 ft / 0.3 m

Roll period: 10.3 seconds

Steadiness - As gun platform (Average = 50 %): 88 %

- Recoil effect (Restricted arc if above 1.00): 0.36

Seaboat quality  (Average = 1.00): 1.75

Hull form characteristics:

Hull has raised forecastle, rise forward of midbreak,

  a normal bow and a cruiser stern

Block coefficient (normal/deep): 0.550 / 0.560

Length to Beam Ratio: 7.86 : 1

'Natural speed' for length: 13.43 kts

Power going to wave formation at top speed: 62 %

Trim (Max stability = 0, Max steadiness = 100): 50

Bow angle (Positive = bow angles forward): 25.00 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 %,  14.76 ft / 4.50 m,  12.80 ft / 3.90 m

   - Forward deck: 30.00 %,  12.14 ft / 3.70 m,  10.93 ft / 3.33 m

   - Aft deck: 35.00 %,  9.84 ft / 3.00 m,  9.84 ft / 3.00 m

   - Quarter deck: 15.00 %,  9.84 ft / 3.00 m,  9.84 ft / 3.00 m

   - Average freeboard: 11.10 ft / 3.38 m

Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 132.3 %

- Above water (accommodation/working, high = better): 73.3 %

Waterplane Area: 2,892 Square feet or 269 Square metres

Displacement factor (Displacement / loading): 99 %

Structure weight / hull surface area: 36 lbs/sq ft or 176 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 0.82

- Longitudinal: 5.88

- Overall: 1.00

Cramped 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

## Extras and notes:

* Above Deck weight is the antenna mast for a wireless set
* Deck weight is wireless equipment as well as extra rescue equipment
* Spare supplies for rescue and search are included in hull storage.
* Additional Balast is included below water.
* Extra above waterline and on deck weight includes facilities for headquarters staff and addtional wirless sets for command and control
* Designed by Tokkaido but built in Octavian Yards.