New Zion Patrol Boat

[Desertfox]

A very cheap patrol boat for coastal work. The quarterdeck is empty so the boat can serve as a coastal minesweeper (with simple minesweeping equipment), VERY slow torpedo boat (with 2x14" torpedoes), or raider (with a squad of marines). The boat carries 1,000 lbs of 'signaling' equipment (rockets, and a mortar).


PB-1, New Zion Patrol  Boat laid down 1912

Displacement:
   25 t light; 26 t standard; 28 t normal; 29 t full load

Dimensions: Length overall / water x beam x draught
   92.55 ft / 90.00 ft x 10.00 ft x 2.70 ft (normal load)
   28.21 m / 27.43 m x 3.05 m  x 0.82 m

Armament:
      1 - 1.97" / 50.0 mm guns in single mounts, 3.81lbs / 1.73kg shells, 1912 Model
     Quick firing gun in deck mount
     on centreline
      2 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1912 Model
     Machine guns in deck mounts
     on side, evenly spread
   Weight of broadside 4 lbs / 2 kg
   Shells per gun, main battery: 250

Machinery:
   Petrol Internal combustion motors,
   Direct drive, 1 shaft, 218 shp / 163 Kw = 15.00 kts
   Range 500nm at 10.00 kts
   Bunker at max displacement = 2 tons

Complement:
   5 - 7

Cost:
   £0.003 million / $0.010 million

Distribution of weights at normal displacement:
   Armament: 0 tons, 1.8 %
   Machinery: 9 tons, 31.3 %
   Hull, fittings & equipment: 12 tons, 43.7 %
   Fuel, ammunition & stores: 2 tons, 8.8 %
   Miscellaneous weights: 4 tons, 14.4 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     24 lbs / 11 Kg = 6.3 x 2.0 " / 50 mm shells or 0.1 torpedoes
   Stability (Unstable if below 1.00): 1.19
   Metacentric height 0.2 ft / 0.1 m
   Roll period: 9.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.14
   Seaboat quality  (Average = 1.00): 1.31

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.400
   Length to Beam Ratio: 9.00 : 1
   'Natural speed' for length: 9.49 kts
   Power going to wave formation at top speed: 59 %
   Trim (Max stability = 0, Max steadiness = 100): 38
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      7.00 ft / 2.13 m
      - Forecastle (20 %):   5.00 ft / 1.52 m
      - Mid (40 %):      4.00 ft / 1.22 m
      - Quarterdeck (20 %):   4.00 ft / 1.22 m
      - Stern:      4.00 ft / 1.22 m
      - Average freeboard:   4.46 ft / 1.36 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 131.7 %
      - Above water (accommodation/working, high = better): 83.2 %
   Waterplane Area: 524 Square feet or 49 Square metres
   Displacement factor (Displacement / loading): 110 %
   Structure weight / hull surface area: 11 lbs/sq ft or 56 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.72
      - Longitudinal: 3.45
      - Overall: 0.84
   Caution: Hull subject to strain in open-sea
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is cramped
   Good seaboat, rides out heavy weather easily

[miketr]

I am impressed...

Michael