Two Ships
--IRS Murmuro
--IRS Crispico
QuoteMurmuro, Imperial Roman Fast Mine Crusier laid down 1914
Displacement:
3,238 t light; 3,324 t standard; 3,750 t normal; 4,091 t full load
Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(410.09 ft / 400.26 ft) x 40.19 ft x (14.76 / 15.82 ft)
(125.00 m / 122.00 m) x 12.25 m x (4.50 / 4.82 m)
Armament:
4 - 3.94" / 100 mm 45.0 cal guns - 30.86lbs / 14.00kg shells, 150 per gun
Quick firing guns in deck mounts, 1906 Model
2 x Twin mounts on centreline, forward evenly spread
2 - 1.77" / 45.0 mm 50.0 cal guns - 3.31lbs / 1.50kg shells, 250 per gun
Quick firing guns in deck mounts, 1905 Model
2 x Single mounts on centreline, aft evenly spread
2 raised mounts
Weight of broadside 130 lbs / 59 kg
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.39" / 10 mm - -
Machinery:
Oil fired boilers, steam turbines,
Direct drive, 2 shafts, 50,000 shp / 37,300 Kw = 31.04 kts
Range 5,000nm at 14.00 kts
Bunker at max displacement = 767 tons
Complement:
239 - 311
Cost:
£0.488 million / $1.950 million
Distribution of weights at normal displacement:
Armament: 20 tons, 0.5 %
- Guns: 20 tons, 0.5 %
Armour: 2 tons, 0.0 %
- Armament: 2 tons, 0.0 %
Machinery: 1,882 tons, 50.2 %
Hull, fittings & equipment: 1,134 tons, 30.2 %
Fuel, ammunition & stores: 512 tons, 13.7 %
Miscellaneous weights: 200 tons, 5.3 %
- On freeboard deck: 200 tons
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,735 lbs / 787 Kg = 56.9 x 3.9 " / 100 mm shells or 0.5 torpedoes
Stability (Unstable if below 1.00): 1.38
Metacentric height 2.2 ft / 0.7 m
Roll period: 11.3 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.05
Seaboat quality (Average = 1.00): 1.00
Hull form characteristics:
Hull has rise forward of midbreak,
a normal bow and a round stern
Block coefficient (normal/deep): 0.553 / 0.562
Length to Beam Ratio: 9.96 : 1
'Natural speed' for length: 20.01 kts
Power going to wave formation at top speed: 66 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 2.07 ft / 0.63 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 21.33 ft / 6.50 m, 21.33 ft / 6.50 m
- Forward deck: 25.00 %, 21.33 ft / 6.50 m, 21.33 ft / 6.50 m
- Aft deck: 40.00 %, 12.30 ft / 3.75 m, 12.30 ft / 3.75 m
- Quarter deck: 15.00 %, 12.30 ft / 3.75 m, 12.30 ft / 3.75 m
- Average freeboard: 16.36 ft / 4.99 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 164.0 %
- Above water (accommodation/working, high = better): 141.5 %
Waterplane Area: 11,258 Square feet or 1,046 Square metres
Displacement factor (Displacement / loading): 91 %
Structure weight / hull surface area: 56 lbs/sq ft or 271 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.83
- Longitudinal: 1.95
- Overall: 0.90
Cramped machinery, storage, compartmentation space
Excellent accommodation and workspace room
Misc Distribution
--On Deck (200t)
----150t Mines
----25t LR Wireless
----10t SR Wireless
----10t Additional Mine Handling equipment
----2t 1912 FC
----3t Construction Reserve
In 1922H2, both ships were updated to 1918 Fire Control.