The second of the Hexagons, the Naissus class introduces VTE engines and Quick-Firing guns.
Four Ships:
QuoteNaissus, Imperial Roman Republic Cruiser laid down 1897
Displacement:
3,500 t light; 3,629 t standard; 4,026 t normal; 4,344 t full load
Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(314.96 ft / 308.40 ft) x 42.65 ft x (20.51 / 21.75 ft)
(96.00 m / 94.00 m) x 13.00 m x (6.25 / 6.63 m)
Armament:
6 - 5.51" / 140 mm 40.0 cal guns - 80.24lbs / 36.40kg shells, 125 per gun
Quick firing guns in deck mounts, 1897 Model
2 x Single mounts on centreline ends, evenly spread
4 x Single mounts on side ends, evenly spread
8 - 2.95" / 75.0 mm 45.0 cal guns - 12.98lbs / 5.89kg shells, 250 per gun
Quick firing guns in deck mounts, 1897 Model
6 x Single mounts on sides, evenly spread
2 x Single mounts on sides, aft deck aft
2 hull mounts in casemates- Limited use in all but light seas
Weight of broadside 585 lbs / 265 kg
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 1.18" / 30 mm 308.40 ft / 94.00 m 7.84 ft / 2.39 m
Main Belt covers 154 % of normal length
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.97" / 50 mm - -
2nd: 0.59" / 15 mm - -
- Protected deck - single deck:
For and Aft decks: 1.57" / 40 mm
Forecastle: 1.18" / 30 mm Quarter deck: 1.18" / 30 mm
- Conning towers: Forward 5.91" / 150 mm, Aft 0.00" / 0 mm
Machinery:
Coal fired boilers, complex reciprocating steam engines,
Direct drive, 2 shafts, 11,200 ihp / 8,355 Kw = 20.59 kts
Range 4,750nm at 10.00 kts
Bunker at max displacement = 715 tons (100% coal)
Complement:
252 - 328
Cost:
£0.399 million / $1.597 million
Distribution of weights at normal displacement:
Armament: 93 tons, 2.3 %
- Guns: 93 tons, 2.3 %
Armour: 437 tons, 10.9 %
- Belts: 106 tons, 2.6 %
- Armament: 42 tons, 1.0 %
- Armour Deck: 257 tons, 6.4 %
- Conning Tower: 32 tons, 0.8 %
Machinery: 1,794 tons, 44.6 %
Hull, fittings & equipment: 991 tons, 24.6 %
Fuel, ammunition & stores: 526 tons, 13.1 %
Miscellaneous weights: 185 tons, 4.6 %
- Hull below water: 25 tons
- Hull above water: 90 tons
- On freeboard deck: 60 tons
- Above deck: 10 tons
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
2,089 lbs / 947 Kg = 24.9 x 5.5 " / 140 mm shells or 0.5 torpedoes
Stability (Unstable if below 1.00): 1.54
Metacentric height 2.9 ft / 0.9 m
Roll period: 10.5 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.17
Seaboat quality (Average = 1.00): 1.60
Hull form characteristics:
Hull has low quarterdeck ,
a ram bow and a cruiser stern
Block coefficient (normal/deep): 0.522 / 0.531
Length to Beam Ratio: 7.23 : 1
'Natural speed' for length: 17.56 kts
Power going to wave formation at top speed: 55 %
Trim (Max stability = 0, Max steadiness = 100): 44
Bow angle (Positive = bow angles forward): -20.00 degrees
Stern overhang: -3.28 ft / -1.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 10.00 %, 15.58 ft / 4.75 m, 15.58 ft / 4.75 m
- Forward deck: 40.00 %, 15.58 ft / 4.75 m, 15.58 ft / 4.75 m
- Aft deck: 40.00 %, 15.58 ft / 4.75 m, 15.58 ft / 4.75 m
- Quarter deck: 10.00 %, 6.56 ft / 2.00 m, 6.56 ft / 2.00 m
- Average freeboard: 14.68 ft / 4.48 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 153.8 %
- Above water (accommodation/working, high = better): 105.3 %
Waterplane Area: 8,940 Square feet or 831 Square metres
Displacement factor (Displacement / loading): 89 %
Structure weight / hull surface area: 66 lbs/sq ft or 321 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.88
- Longitudinal: 2.89
- Overall: 1.00
Cramped machinery, storage, compartmentation space
Adequate 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
Misc Distribution
--Below Water (20t)
----18t 12x350mm Torpedos (35 Pattern B)
----2t Additional Torpedo Handing Equipment
--Above Water (90t)
----10t Improved Officer Accommodations
----10t Improved Crew Accommodations
----20t Additional Troop Compliment
----25t Construction Reserve
--On Deck (60t)
----30t Additional Troop Compliment
----10t Flag Facilities
----5t Admiralty Accommodations
----15t Construction Reserve
--Above Deck (10t)
----5t Improved Aquisition Structures
----5t Additional Searchlights