Custodi Type Sloops

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The oldest general purpose Sloop, the Custodi Classes form the backbone of the Imperial Navy's coastal security forces. The basic design was first built in 1890 and has three sub-variants with various technological improvements.

Custodi I, Imperial Roman Navy Sloop laid down 1890

Displacement:
   500 t light; 520 t standard; 596 t normal; 657 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (187.00 ft / 183.73 ft) x 26.25 ft x (9.84 / 10.58 ft)
   (57.00 m / 56.00 m) x 8.00 m  x (3.00 / 3.22 m)

Armament:
      1 - 5.51" / 140 mm 45.0 cal gun - 79.37lbs / 36.00kg shells, 50 per gun
     Breech loading gun in deck mount, 1890 Model
     1 x Single mount on centreline, forward deck centre
      2 - 2.95" / 75.0 mm 45.0 cal guns - 13.23lbs / 6.00kg shells, 150 per gun
     Breech loading guns in deck mounts, 1890 Model
     2 x Single mounts on sides, aft deck centre
      4 - 1.77" / 45.0 mm 45.0 cal guns - 2.76lbs / 1.25kg shells, 500 per gun
     Breech loading guns in deck mounts, 1885 Model
     4 x Single mounts on sides, evenly spread
      Weight of broadside 117 lbs / 53 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.59" / 15 mm         -               -
   2nd:   0.59" / 15 mm         -               -

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 1 shaft, 675 ihp / 504 Kw = 13.02 kts
   Range 2,500nm at 10.00 kts
   Bunker at max displacement = 137 tons (100% coal)

Complement:
   59 - 78

Cost:
   £0.042 million / $0.167 million

Distribution of weights at normal displacement:
   Armament: 19 tons, 3.2 %
      - Guns: 19 tons, 3.2 %
   Armour: 4 tons, 0.7 %
      - Armament: 4 tons, 0.7 %
   Machinery: 131 tons, 22.0 %
   Hull, fittings & equipment: 188 tons, 31.5 %
   Fuel, ammunition & stores: 96 tons, 16.0 %
   Miscellaneous weights: 158 tons, 26.5 %
      - Hull below water: 3 tons
      - Hull above water: 95 tons
      - On freeboard deck: 50 tons
      - Above deck: 10 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     722 lbs / 328 Kg = 8.6 x 5.5 " / 140 mm shells or 0.5 torpedoes
   Stability (Unstable if below 1.00): 1.27
   Metacentric height 1.0 ft / 0.3 m
   Roll period: 10.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.18
   Seaboat quality  (Average = 1.00): 1.92

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.440 / 0.451
   Length to Beam Ratio: 7.00 : 1
   'Natural speed' for length: 13.55 kts
   Power going to wave formation at top speed: 40 %
   Trim (Max stability = 0, Max steadiness = 100): 37
   Bow angle (Positive = bow angles forward): 5.00 degrees
   Stern overhang: 2.56 ft / 0.78 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  8.20 ft / 2.50 m,  8.20 ft / 2.50 m
      - Forward deck:   30.00 %,  8.20 ft / 2.50 m,  8.20 ft / 2.50 m
      - Aft deck:   35.00 %,  8.20 ft / 2.50 m,  8.20 ft / 2.50 m
      - Quarter deck:   15.00 %,  8.20 ft / 2.50 m,  8.20 ft / 2.50 m
      - Average freeboard:      8.20 ft / 2.50 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 99.2 %
      - Above water (accommodation/working, high = better): 76.8 %
   Waterplane Area: 2,901 Square feet or 270 Square metres
   Displacement factor (Displacement / loading): 124 %
   Structure weight / hull surface area: 40 lbs/sq ft or 197 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.90
      - Longitudinal: 2.44
      - Overall: 1.00
   Adequate 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

Custodi II, Imperial Roman Navy Sloop laid down 1895

Displacement:
   500 t light; 519 t standard; 603 t normal; 670 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (187.00 ft / 183.73 ft) x 26.25 ft x (9.84 / 10.64 ft)
   (57.00 m / 56.00 m) x 8.00 m  x (3.00 / 3.24 m)

Armament:
      1 - 5.51" / 140 mm 45.0 cal gun - 79.37lbs / 36.00kg shells, 50 per gun
     Breech loading gun in deck mount, 1890 Model
     1 x Single mount on centreline, forward deck centre
      2 - 2.95" / 75.0 mm 45.0 cal guns - 12.98lbs / 5.89kg shells, 150 per gun
     Breech loading guns in deck mounts, 1890 Model
     2 x Single mounts on sides, aft deck centre
      4 - 1.77" / 45.0 mm 45.0 cal guns - 2.80lbs / 1.27kg shells, 500 per gun
     Breech loading guns in deck mounts, 1890 Model
     4 x Single mounts on sides, evenly spread
      Weight of broadside 117 lbs / 53 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.59" / 15 mm         -               -
   2nd:   0.59" / 15 mm         -               -

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 1 shaft, 700 ihp / 522 Kw = 13.11 kts
   Range 3,000nm at 10.00 kts
   Bunker at max displacement = 150 tons (100% coal)

Complement:
   60 - 79

Cost:
   £0.042 million / $0.166 million

Distribution of weights at normal displacement:
   Armament: 19 tons, 3.2 %
      - Guns: 19 tons, 3.2 %
   Armour: 4 tons, 0.7 %
      - Armament: 4 tons, 0.7 %
   Machinery: 130 tons, 21.5 %
   Hull, fittings & equipment: 179 tons, 29.7 %
   Fuel, ammunition & stores: 103 tons, 17.1 %
   Miscellaneous weights: 168 tons, 27.9 %
      - Hull below water: 8 tons
      - Hull above water: 90 tons
      - On freeboard deck: 50 tons
      - Above deck: 20 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     741 lbs / 336 Kg = 8.8 x 5.5 " / 140 mm shells or 0.5 torpedoes
   Stability (Unstable if below 1.00): 1.26
   Metacentric height 1.0 ft / 0.3 m
   Roll period: 10.9 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.18
   Seaboat quality  (Average = 1.00): 1.93

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.445 / 0.457
   Length to Beam Ratio: 7.00 : 1
   'Natural speed' for length: 13.55 kts
   Power going to wave formation at top speed: 41 %
   Trim (Max stability = 0, Max steadiness = 100): 37
   Bow angle (Positive = bow angles forward): 5.00 degrees
   Stern overhang: 2.56 ft / 0.78 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  8.20 ft / 2.50 m,  8.20 ft / 2.50 m
      - Forward deck:   30.00 %,  8.20 ft / 2.50 m,  8.20 ft / 2.50 m
      - Aft deck:   35.00 %,  8.20 ft / 2.50 m,  8.20 ft / 2.50 m
      - Quarter deck:   15.00 %,  8.20 ft / 2.50 m,  8.20 ft / 2.50 m
      - Average freeboard:      8.20 ft / 2.50 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 97.4 %
      - Above water (accommodation/working, high = better): 75.9 %
   Waterplane Area: 2,915 Square feet or 271 Square metres
   Displacement factor (Displacement / loading): 123 %
   Structure weight / hull surface area: 38 lbs/sq ft or 187 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.91
      - Longitudinal: 2.43
      - Overall: 1.00
   Adequate 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

Custodi III, Imperial Roman Navy Sloop laid down 1897

Displacement:
   500 t light; 520 t standard; 615 t normal; 691 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (187.00 ft / 183.73 ft) x 26.25 ft x (9.84 / 10.75 ft)
   (57.00 m / 56.00 m) x 8.00 m  x (3.00 / 3.28 m)

Armament:
      1 - 5.51" / 140 mm 45.0 cal gun - 84.44lbs / 38.30kg shells, 50 per gun
     Quick firing gun in deck mount, 1897 Model
     1 x Single mount on centreline, forward deck centre
      2 - 2.95" / 75.0 mm 45.0 cal guns - 12.98lbs / 5.89kg shells, 150 per gun
     Quick firing guns in deck mounts, 1897 Model
     2 x Single mounts on sides, aft deck centre
      4 - 1.77" / 45.0 mm 45.0 cal guns - 2.80lbs / 1.27kg shells, 500 per gun
     Quick firing guns in deck mounts, 1897 Model
     4 x Single mounts on sides, evenly spread
      Weight of broadside 122 lbs / 55 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.59" / 15 mm         -               -
   2nd:   0.59" / 15 mm         -               -

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 1 shaft, 750 ihp / 560 Kw = 13.31 kts
   Range 3,500nm at 10.00 kts
   Bunker at max displacement = 171 tons (100% coal)

Complement:
   61 - 80

Cost:
   £0.041 million / $0.163 million

Distribution of weights at normal displacement:
   Armament: 22 tons, 3.6 %
      - Guns: 22 tons, 3.6 %
   Armour: 4 tons, 0.7 %
      - Armament: 4 tons, 0.7 %
   Machinery: 123 tons, 20.0 %
   Hull, fittings & equipment: 173 tons, 28.1 %
   Fuel, ammunition & stores: 115 tons, 18.7 %
   Miscellaneous weights: 178 tons, 28.9 %
      - Hull below water: 8 tons
      - Hull above water: 100 tons
      - On freeboard deck: 50 tons
      - Above deck: 20 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     776 lbs / 352 Kg = 9.3 x 5.5 " / 140 mm shells or 0.5 torpedoes
   Stability (Unstable if below 1.00): 1.25
   Metacentric height 1.0 ft / 0.3 m
   Roll period: 11.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.19
   Seaboat quality  (Average = 1.00): 1.93

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.454 / 0.467
   Length to Beam Ratio: 7.00 : 1
   'Natural speed' for length: 13.55 kts
   Power going to wave formation at top speed: 42 %
   Trim (Max stability = 0, Max steadiness = 100): 37
   Bow angle (Positive = bow angles forward): 5.00 degrees
   Stern overhang: 2.56 ft / 0.78 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  8.20 ft / 2.50 m,  8.20 ft / 2.50 m
      - Forward deck:   30.00 %,  8.20 ft / 2.50 m,  8.20 ft / 2.50 m
      - Aft deck:   35.00 %,  8.20 ft / 2.50 m,  8.20 ft / 2.50 m
      - Quarter deck:   15.00 %,  8.20 ft / 2.50 m,  8.20 ft / 2.50 m
      - Average freeboard:      8.20 ft / 2.50 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 93.8 %
      - Above water (accommodation/working, high = better): 75.3 %
   Waterplane Area: 2,941 Square feet or 273 Square metres
   Displacement factor (Displacement / loading): 127 %
   Structure weight / hull surface area: 38 lbs/sq ft or 183 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.91
      - Longitudinal: 2.40
      - Overall: 1.00
   Adequate 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

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By the end of 1923H1, the Custodi III class had been updated to the following Misc Weight distribution. These upgrades took place between 1917H2 and 1918H2, which an update to 1918 Fire Control occurring for all ships by the end of 1923H1.

Misc Weight Distribution
-Below Water (8t)
--8t Additional Damage Control Equipment
-Above Water (100t)
--50t Minesweeping Equipment
--25t Long-Range Wireless
--25t 1905 Huelsmeyre Equipment
-On Deck (50t)
--4t 1918 FC
--30t Minesweeping Equipment
--6t Improved crew comfort items
--10t Short Range Wireless
-Above Deck (20t)
--5t Additional Optical Spotting Equipment
--10t Night Fighting Equipment
--5t Improved Signaling Equipment

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The Custodi I Class Sloops were scrapped in 1926H1