Roma Class

Roma Class, SPQO:Navy B laid down 1898

## Displacement:

            11.501 t light; 12.125 t standard; 13.129 t normal; 13.932 t full load

### Dimensions: Length (overall / waterline) x beam x draught (normal/deep)

            (431,00 ft / 421,00 ft) x 75,00 ft x (27,00 / 28,29 ft)

            (131,37 m / 128,32 m) x 22,86 m  x (8,23 / 8,62 m)

## Armament:

  4 - 12,00" / 305 mm 42,0 cal guns - 837,82lbs / 380,03kg shells, 110 per gun

              Breech loading guns in turret on barbette mounts, 1898 Model

              2 x 2-gun mounts on centreline ends, evenly spread

  14 - 6,00" / 152 mm 40,0 cal guns - 103,51lbs / 46,95kg shells, 180 per gun

              Breech loading guns in casemate mounts, 1898 Model

              14 x Single mounts on sides, evenly spread

                          4 raised mounts

  16 - 2,24" / 57,0 mm 39,0 cal guns - 5,38lbs / 2,44kg shells, 240 per gun

              Quick firing guns in deck mounts, 1898 Model

              16 x Single mounts on sides, evenly spread

                        8 raised mounts

  Weight of broadside 4.886 lbs / 2.216 kg

## Armour:

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

            Main:  12,0" / 305 mm  263,00 ft / 80,16 m          10,00 ft / 3,05 m

            Ends:  6,00" / 152 mm  158,00 ft / 48,16 m          12,00 ft / 3,66 m

            Upper: 6,00" / 152 mm  263,00 ft / 80,16 m          6,00 ft / 1,83 m

              Main Belt covers 96 % of normal length

###   - Torpedo Bulkhead - Strengthened structural bulkheads:

                          1,00" / 25 mm    265,00 ft / 80,77 m          26,00 ft / 7,92 m

            Beam between torpedo bulkheads 60,00 ft / 18,29 m

###   - Gun armour:

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

            Main:  13,0" / 330 mm  8,00" / 203 mm                 12,0" / 305 mm

            2nd:    4,00" / 102 mm    -                                     -

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

###   - Armoured deck - multiple decks:

            For and Aft decks: 3,00" / 76 mm

            Forecastle: 2,00" / 51 mm  Quarter deck: 2,00" / 51 mm

###   - Conning towers:

Forward 6,00" / 152 mm, Aft 2,00" / 51 mm

## Machinery:

            Coal fired boilers, complex reciprocating steam engines,

            Direct drive, 2 shafts, 12.688 ihp / 9.466 Kw = 18,00 kts

            Range 6.000nm at 10,00 kts

            Bunker at max displacement = 1.808 tons (100% coal)

## Cost:

            £1,046 million / $4,183 million

### Distribution of weights at normal displacement:

            Armament: 891 tons, 6,8 %

              - Guns: 891 tons, 6,8 %

            Armour: 4.713 tons, 35,9 %

              - Belts: 2.257 tons, 17,2 %

              - Torpedo bulkhead: 255 tons, 1,9 %

              - Armament: 960 tons, 7,3 %

              - Armour Deck: 1.145 tons, 8,7 %

              - Conning Towers: 96 tons, 0,7 %

            Machinery: 2.047 tons, 15,6 %

            Hull, fittings & equipment: 3.651 tons, 27,8 %

            Fuel, ammunition & stores: 1.628 tons, 12,4 %

            Miscellaneous weights: 200 tons, 1,5 %

              - On freeboard deck: 100 tons

              - Above deck: 100 tons

### Overall survivability and seakeeping ability:

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

              17.807 lbs / 8.077 Kg = 20,6 x 12,0 " / 305 mm shells or 3,1 torpedoes

            Stability (Unstable if below 1.00): 1,27

            Metacentric height 5,0 ft / 1,5 m

            Roll period: 14,1 seconds

            Steadiness         - As gun platform (Average = 50 %): 95 %

                                          - Recoil effect (Restricted arc if above 1.00): 0,57

            Seaboat quality  (Average = 1.00): 1,89

### Hull form characteristics:

            Hull has a flush deck,

              a ram bow and a cruiser stern

            Block coefficient (normal/deep): 0,539 / 0,546

            Length to Beam Ratio: 5,61 : 1

            'Natural speed' for length: 20,52 kts

            Power going to wave formation at top speed: 45 %

            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): 96,0 %

                          - Above water (accommodation/working, high = better): 122,0 %

            Waterplane Area: 21.810 Square feet or 2.026 Square metres

            Displacement factor (Displacement / loading): 106 %

            Structure weight / hull surface area: 134 lbs/sq ft or 652 Kg/sq metre

            Hull strength (Relative):

                          - Cross-sectional: 0,90

                          - Longitudinal: 2,50

                          - 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