Defence Class (Octavia)

Defence class, SPQO:Navy Armored crusier laid down 1903

            4.489 t light; 4.646 t standard; 4.833 t normal; 4.982 t full load

            (139,05 m / 137,16 m) x 15,24 m  x (4,27 / 4,37 m)

  5 - 6,00" / 152 mm 40,0 cal guns - 103,51lbs / 46,95kg shells, 150 per gun

              Breech loading guns in deck mounts, 1903 Model

              3 x Single mounts on centreline, evenly spread

              2 x Single mounts on sides, forward deck aft

  6 - 4,00" / 102 mm 40,0 cal guns - 30,67lbs / 13,91kg shells, 150 per gun

              Breech loading guns in casemate mounts, 1903 Model

              6 x Single mounts on sides, evenly spread

  4 - 2,24" / 57,0 mm 39,0 cal guns - 5,39lbs / 2,44kg shells, 200 per gun

              Quick firing guns in deck mounts, 1903 Model

              4 x Single mounts on side ends, evenly spread

  Weight of broadside 723 lbs / 328 kg

            In 4 sets of deck mounted carriage/fixed tubes

## Armour:

   - Belts:            Width (max)        Length (avg)                      Height (avg)

            Main:  2,00" / 51 mm    357,00 ft / 108,81 m        17,00 ft / 5,18 m

            Ends:  Unarmoured

              Main Belt covers 122 % of normal length

###    - Torpedo Bulkhead - Strengthened structural bulkheads:

                            1,00" / 25 mm    360,00 ft / 109,73 m        14,00 ft / 4,27 m

            Beam between torpedo bulkheads 43,00 ft / 13,11 m

###    - Gun armour:

Face (max)          Other gunhouse (avg)      Barbette/hoist (max)

            Main:  2,00" / 51 mm      -                                      -

            2nd:    2,00" / 51 mm      -                                      -

            3rd:      1,00" / 25 mm      -                                      -

###    - Armoured deck - multiple decks:

            For and Aft decks: 2,00" / 51 mm

            Forecastle: 1,00" / 25 mm  Quarter deck: 1,00" / 25 mm

## Machinery:

            Coal and oil fired boilers, complex reciprocating steam engines,

            Direct drive, 3 shafts, 9.869 ihp / 7.362 Kw = 20,00 kts

            Range 2.000nm at 10,00 kts

            Bunker at max displacement = 336 tons (90% coal)

## Cost:

            £0,392 million / $1,568 million

### Distribution of weights at normal displacement:

            Armament: 102 tons, 2,1 %

               - Guns: 98 tons, 2,0 %

               - Weapons: 4 tons, 0,1 %

            Armour: 1.279 tons, 26,5 %

               - Belts: 488 tons, 10,1 %

               - Torpedo bulkhead: 186 tons, 3,9 %

               - Armament: 56 tons, 1,2 %

               - Armour Deck: 525 tons, 10,9 %

               - Conning Tower: 25 tons, 0,5 %

            Machinery: 1.458 tons, 30,2 %

            Hull, fittings & equipment: 1.474 tons, 30,5 %

            Fuel, ammunition & stores: 344 tons, 7,1 %

            Miscellaneous weights: 175 tons, 3,6 %

               - On freeboard deck: 100 tons

               - Above deck: 75 tons

### Overall survivability and seakeeping ability:

            Survivability (Non-critical penetrating hits needed to sink ship):

              6.708 lbs / 3.043 Kg = 62,1 x 6,0 " / 152 mm shells or 2,3 torpedoes

            Stability (Unstable if below 1.00): 1,33

            Metacentric height 2,9 ft / 0,9 m

            Roll period: 12,3 seconds

            Steadiness          - As gun platform (Average = 50 %): 100 %

                                            - Recoil effect (Restricted arc if above 1.00): 0,22

            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): 0,537 / 0,541

            Length to Beam Ratio: 9,00 : 1

            'Natural speed' for length: 21,21 kts

            Power going to wave formation at top speed: 40 %

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

            Bow angle (Positive = bow angles forward): 19,00 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 %,  18,00 ft / 5,49 m,  18,00 ft / 5,49 m

               - Forward deck: 30,00 %,  18,00 ft / 5,49 m,  18,00 ft / 5,49 m

               - Aft deck:      35,00 %,  18,00 ft / 5,49 m,  18,00 ft / 5,49 m

               - Quarter deck:  15,00 %,  18,00 ft / 5,49 m,  18,00 ft / 5,49 m

               - Average freeboard:                    18,00 ft / 5,49 m

            Ship tends to be wet forward

### Ship space, strength and comments:

            Space  - Hull below water (magazines/engines, low = better): 122,0 %

                            - Above water (accommodation/working, high = better): 182,8 %

            Waterplane Area: 15.513 Square feet or 1.441 Square metres

            Displacement factor (Displacement / loading): 104 %

            Structure weight / hull surface area: 69 lbs/sq ft or 338 Kg/sq metre

            Hull strength (Relative):

                            - Cross-sectional: 0,94

                            - Longitudinal: 1,67

                            - Overall: 1,00

            Cramped 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