Persian Patrol & Mine boat

[ledeper]

Ms 01, Persia Patrol and mine boat laid down 1909 (Engine 1906)

Displacement:
   493 t light; 509 t standard; 578 t normal; 633 t full load

Dimensions: Length overall / water x beam x draught
   231,97 ft / 229,66 ft x 32,81 ft x 6,07 ft (normal load)
   70,71 m / 70,00 m x 10,00 m  x 1,85 m

Armament:
      1 - 3,94" / 100 mm guns in single mounts, 30,51lbs / 13,84kg shells, 1909 Model
     Quick firing gun in deck mount
     on centreline forward
      2 - 0,79" / 20,0 mm guns in single mounts, 0,24lbs / 0,11kg shells, 1909 Model
     Breech loading guns in deck mounts
     on side, all amidships
   Weight of broadside 31 lbs / 14 kg
   Shells per gun, main battery: 250

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0,39" / 10 mm         -               -

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 1 shaft, 2.190 shp / 1.633 Kw = 18,00 kts
   Range 3.500nm at 10,00 kts
   Bunker at max displacement = 124 tons

Complement:
   58 - 76

Cost:
   £0,040 million / $0,162 million

Distribution of weights at normal displacement:
   Armament: 4 tons, 0,7 %
   Armour: 1 tons, 0,1 %
      - Belts: 0 tons, 0,0 %
      - Torpedo bulkhead: 0 tons, 0,0 %
      - Armament: 1 tons, 0,1 %
      - Armour Deck: 0 tons, 0,0 %
      - Conning Tower: 0 tons, 0,0 %
   Machinery: 142 tons, 24,6 %
   Hull, fittings & equipment: 261 tons, 45,1 %
   Fuel, ammunition & stores: 85 tons, 14,7 %
   Miscellaneous weights: 85 tons, 14,7 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1.068 lbs / 484 Kg = 35,0 x 3,9 " / 100 mm shells or 0,6 torpedoes
   Stability (Unstable if below 1.00): 1,28
   Metacentric height 1,5 ft / 0,4 m
   Roll period: 11,4 seconds
   Steadiness   - As gun platform (Average = 50 %): 74 %
         - Recoil effect (Restricted arc if above 1.00): 0,03
   Seaboat quality  (Average = 1.00): 1,48

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0,442
   Length to Beam Ratio: 7,00 : 1
   'Natural speed' for length: 15,15 kts
   Power going to wave formation at top speed: 50 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 10,00 degrees
   Stern overhang: 0,00 ft / 0,00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      13,12 ft / 4,00 m
      - Forecastle (20 %):   10,60 ft / 3,23 m
      - Mid (50 %):      10,60 ft / 3,23 m
      - Quarterdeck (15 %):   10,60 ft / 3,23 m
      - Stern:      10,60 ft / 3,23 m
      - Average freeboard:   10,80 ft / 3,29 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 101,7 %
      - Above water (accommodation/working, high = better): 158,1 %
   Waterplane Area: 4.544 Square feet or 422 Square metres
   Displacement factor (Displacement / loading): 144 %
   Structure weight / hull surface area: 38 lbs/sq ft or 188 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,92
      - Longitudinal: 2,06
      - Overall: 1,00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is excellent
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

Mines 60t
Sweeping gear 15 t
W/L 10