Sloops

[Carthaginian]

Original Illustration by Carthaginian: http://i142.photobucket.com/albums/r114/Carthaginian/S-01.png

Twenty ships: S-01 to S-20

S-01, Confederate States of America Sloop laid down 1909

Displacement:
  200 t light; 210 t standard; 256 t normal; 293 t full load

Dimensions: Length overall / water x beam x draught
  185.00 ft / 175.00 ft x 18.00 ft x 5.50 ft (normal load)
  56.39 m / 53.34 m x 5.49 m  x 1.68 m

Armament:
     1 - 3.50" / 88.9 mm guns in single mounts, 25.00lbs / 11.34kg shells, 1909 Model
    Quick firing gun in deck mount
    on centreline forward
     2 - 2.25" / 57.2 mm guns in single mounts, 5.00lbs / 2.27kg shells, 1909 Model
    Quick firing guns in deck mounts
    on centreline, all aft, 1 raised mount
     4 - 1.00" / 25.4 mm guns (2x2 guns), 0.50lbs / 0.23kg shells, 1909 Model
    Machine guns in deck mounts
    on side, all amidships
  Weight of broadside 37 lbs / 17 kg
  Shells per gun, main battery: 200
  1 - 20.0" / 508 mm submerged torpedo tubes

Armour:
  - Belts:      Width (max)   Length (avg)      Height (avg)
  Main:   0.50" / 13 mm     81.00 ft / 24.69 m   9.00 ft / 2.74 m
  Ends:   Unarmoured
    Main Belt covers 71 % of normal length

  - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
  Main:   0.50" / 13 mm         -               -
  2nd:   0.50" / 13 mm         -               -
  3rd:   0.25" / 6 mm         -               -

  - Armour deck: 0.25" / 6 mm, Conning tower: 1.00" / 25 mm

Machinery:
  Petrol Internal combustion motors,
  Direct drive, 4 shafts, 800 shp / 597 Kw = 15.53 kts
  Range 4,000nm at 10.63 kts
  Bunker at max displacement = 83 tons

Complement:
  31 - 41

Cost:
  £0.016 million / $0.063 million

Distribution of weights at normal displacement:
  Armament: 4 tons, 1.7 %
  Armour: 29 tons, 11.3 %
     - Belts: 16 tons, 6.3 %
     - Torpedo bulkhead: 0 tons, 0.0 %
     - Armament: 2 tons, 0.8 %
     - Armour Deck: 10 tons, 3.9 %
     - Conning Tower: 1 tons, 0.3 %
  Machinery: 36 tons, 14.2 %
  Hull, fittings & equipment: 128 tons, 50.0 %
  Fuel, ammunition & stores: 56 tons, 21.9 %
  Miscellaneous weights: 2 tons, 0.8 %

Overall survivability and seakeeping ability:
  Survivability (Non-critical penetrating hits needed to sink ship):
    637 lbs / 289 Kg = 29.7 x 3.5 " / 89 mm shells or 0.6 torpedoes
  Stability (Unstable if below 1.00): 1.13
  Metacentric height 0.5 ft / 0.1 m
  Roll period: 10.9 seconds
  Steadiness   - As gun platform (Average = 50 %): 70 %
        - Recoil effect (Restricted arc if above 1.00): 0.33
  Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
  Hull has rise forward of midbreak
  Block coefficient: 0.517
  Length to Beam Ratio: 9.72 : 1
  'Natural speed' for length: 13.23 kts
  Power going to wave formation at top speed: 48 %
  Trim (Max stability = 0, Max steadiness = 100): 35
  Bow angle (Positive = bow angles forward): 18.45 degrees
  Stern overhang: 5.00 ft / 1.52 m
  Freeboard (% = measuring location as a percentage of overall length):
     - Stem:      15.00 ft / 4.57 m
     - Forecastle (20 %):   14.50 ft / 4.42 m
     - Mid (50 %):      14.00 ft / 4.27 m (6.00 ft / 1.83 m aft of break)
     - Quarterdeck (15 %):   6.00 ft / 1.83 m
     - Stern:      8.00 ft / 2.44 m
     - Average freeboard:   10.37 ft / 3.16 m

Ship space, strength and comments:
  Space   - Hull below water (magazines/engines, low = better): 70.9 %
     - Above water (accommodation/working, high = better): 128.5 %
  Waterplane Area: 2,132 Square feet or 198 Square metres
  Displacement factor (Displacement / loading): 185 %
  Structure weight / hull surface area: 25 lbs/sq ft or 120 Kg/sq metre
  Hull strength (Relative):
     - Cross-sectional: 0.80
     - Longitudinal: 7.49
     - Overall: 1.00
  Hull space for machinery, storage, compartmentation is excellent
  Room for accommodation and workspaces is excellent
  Ship has slow, easy roll, a good, steady gun platform
  Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Armored deck represents the 1" thick armored fuel tank.

S-01-10           launched: June 1909; comissioned: September 1909
S-01-10           launched: December 1909; comissioned: March 1910 (pending)

[Guinness]

The small sloops of the S-1 class and their minesweeping cousins of the SM-1 class are viewed as largely successful. The CSN can never have enough small cheap coastal patrol vessels, but at the same time also has requirements for similarly sized vessels for minesweeping and tending and laying defensive minefields. Additionally, while every ship of this class will have a short range wireless set, officers in the coast defense command expressed a desire for ships that could transmit at greater distances when traveling further away from shore stations.

All of these requirements were found to be obtainable on a common hull, and ships equipped for each mission are considered one class. Minesweepers and layers can be reconfigured for the other role in 24 - 48 hours. The basic patrol version can be converted to sweeping or laying with between one and two weeks of yard time. Conversion of the long range patrol version isn't expected to be feasible without a refit in a dockyard.

Machinery is 4 diesel engines derived from submarine practice, with two clutched directly to each shaft.

20 ships completed in 1916:

S-21(MS)	S-31(MS)
S-22(MS)	S-32(MS)
S-23(SP)	S-33(SP)
S-24(SP)	S-34(SP)
S-25(SP)	S-35(SP)
S-36(ML)	S-26(ML)
S-27(ML)	S-37(ML)
S-28(LR)	S-38(LR)
S-29(SP)	S-39(SP)
S-30(SP)	S-40(SP)

SP: Standard Patrol, LR: Long Range Wireless Equipped, MS: Mine Sweeping, ML: Mine Laying



S-21, CSA Sloop laid down 1915 (Engine 1912)

Displacement:
   300 t light; 313 t standard; 423 t normal; 511 t full load

Dimensions: Length overall / water x beam x draught
   195.00 ft / 185.00 ft x 20.50 ft x 6.60 ft (normal load)
   59.44 m / 56.39 m x 6.25 m  x 2.01 m

Armament:
      2 - 3.50" / 88.9 mm guns in single mounts, 20.00lbs / 9.07kg shells, 1915 Model
     Quick firing guns in deck mounts
     on centreline, evenly spread
      2 - 1.00" / 25.4 mm guns (1x2 guns), 0.50lbs / 0.23kg shells, 1915 Model
     Anti-aircraft guns in deck mount
     on centreline amidships, all raised guns - superfiring
      4 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1915 Model
     Breech loading guns in deck mounts
     on side, evenly spread, 2 raised mounts
   Weight of broadside 41 lbs / 19 kg
   Shells per gun, main battery: 186

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.25" / 6 mm         -               -
   3rd:   0.25" / 6 mm         -               -
   5th:   0.25" / 6 mm         -               -

Machinery:
   Diesel Internal combustion motors,
   Direct drive, 2 shafts, 2,000 shp / 1,492 Kw = 18.00 kts
   Range 6,000nm at 12.00 kts
   Bunker at max displacement = 198 tons

Complement:
   46 - 60

Cost:
   £0.038 million / $0.153 million

Distribution of weights at normal displacement:
   Armament: 6 tons, 1.3 %
   Armour: 1 tons, 0.3 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 1 tons, 0.3 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 80 tons, 18.9 %
   Hull, fittings & equipment: 177 tons, 42.0 %
   Fuel, ammunition & stores: 123 tons, 29.1 %
   Miscellaneous weights: 36 tons, 8.5 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     880 lbs / 399 Kg = 41.0 x 3.5 " / 89 mm shells or 0.6 torpedoes
   Stability (Unstable if below 1.00): 1.15
   Metacentric height 0.6 ft / 0.2 m
   Roll period: 11.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 80 %
         - Recoil effect (Restricted arc if above 1.00): 0.26
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0.591
   Length to Beam Ratio: 9.02 : 1
   'Natural speed' for length: 13.60 kts
   Power going to wave formation at top speed: 58 %
   Trim (Max stability = 0, Max steadiness = 100): 40
   Bow angle (Positive = bow angles forward): 18.45 degrees
   Stern overhang: 5.00 ft / 1.52 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      15.00 ft / 4.57 m
      - Forecastle (10 %):   14.50 ft / 4.42 m
      - Mid (58 %):      14.00 ft / 4.27 m (6.00 ft / 1.83 m aft of break)
      - Quarterdeck (18 %):   7.00 ft / 2.13 m
      - Stern:      8.00 ft / 2.44 m
      - Average freeboard:   11.22 ft / 3.42 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 81.4 %
      - Above water (accommodation/working, high = better): 132.9 %
   Waterplane Area: 2,751 Square feet or 256 Square metres
   Displacement factor (Displacement / loading): 176 %
   Structure weight / hull surface area: 29 lbs/sq ft or 140 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.81
      - Longitudinal: 6.52
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is excellent
   Room for accommodation and workspaces is excellent
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Misc weight used for mission specific equipment, which can include:

Minesweeping Gear (15 tons)
Two Extra Motor Launches (4 tons)
Accommodations for up to a 16 man shore party (32 tons)
36 mines (36 tons)
Long Range Wireless set (25 tons)