III. (c) Fischerieschutzbooten (Fisheries Protection Boats)

[The Rock Doctor]

SMS Vulkan SUNK 11 November 1916
SMS Zeus
SMS Poseidon
SMS Hermes
SMS Apollo SUNK December 1916
SMS Ares SUNK 19 October 1916
SMS Artemis SUNK December 1916
SMS Prometheus SUNK 19 November 1916
SMS Epithemeus SUNK December 1916
SMS Heracles

[The Rock Doctor]

Vulkan class

A Fisheries Patrol Vessel, with a secondary roles as transports to smaller island garrisons.  Built to merchantile standards.

SMS Vulkan, laid down 1909 SUNK
SMS Zeus, laid down 1909
SMS Poseidon, laid down 1909
SMS Hermes, laid down 1909
SMS Apollo, laid down 1910 SUNK
SMS Ares, laid down 1910 SUNK
SMS Artemis, laid down 1910 SUNK
SMS Prometheus, laid down 1910 SUNK
SMS Epithemeus, laid down 1911 SUNK
SMS Heracles, laid down 1911

Brandenburgian Fisheries Patrol Vessel laid down 1909

Displacement:
   993 t light; 1,027 t standard; 1,363 t normal; 1,631 t full load

Dimensions: Length overall / water x beam x draught
   236.22 ft / 229.66 ft x 34.45 ft x 11.48 ft (normal load)
   72.00 m / 70.00 m x 10.50 m  x 3.50 m

Armament:
     2 - 3.46" / 88.0 mm guns in single mounts, 22.05lbs / 10.00kg shells, 1900 Model
     Quick firing guns in deck mounts
     on centreline ends, evenly spread
     1 - 1.97" / 50.0 mm guns in single mounts, 3.86lbs / 1.75kg shells, 1903 Model
     Quick firing gun in deck mount
     on centreline amidships, 1 raised gun
     2 - 0.30" / 7.7 mm guns in single mounts, 0.01lbs / 0.01kg shells, 1909 Model
     Breech loading guns in deck mounts
     on side, all amidships

   Weight of broadside 48 lbs / 22 kg
   Shells per gun, main battery: 250

Armour:
  - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:      0.79" / 20 mm         -               -

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 1,500 ihp / 1,119 Kw = 14.19 kts
   Range 10,000nm at 9.79 kts (Bunkerage = 604 tons)

Complement:
   111 - 145

Cost:
   £0.056 million / $0.223 million

Distribution of weights at normal displacement:
   Armament: 6 tons, 0.4 %
   Armour: 3 tons, 0.2 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 3 tons, 0.2 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 115 tons, 8.5 %
   Hull, fittings & equipment: 569 tons, 41.7 %
   Fuel, ammunition & stores: 370 tons, 27.2 %
   Miscellaneous weights: 300 tons, 22.0 %
      - Markoni room, 10 tons
      - Marine constable accomodation, 50 tons
      - Steam launches, 20 tons
      - Coal as cargo, 50 tons
      - Oil as cargo, 20 tons
      - Perishables storage, 50 tons
      - General cargo space, 100 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     2,948 lbs / 1,337 Kg = 141.8 x 3.5 " / 88 mm shells or 1.4 torpedoes
   Stability (Unstable if below 1.00): 1.19
   Metacentric height 1.4 ft / 0.4 m
   Roll period: 12.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.04
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.525
   Length to Beam Ratio: 6.67 : 1
   'Natural speed' for length: 15.15 kts
   Power going to wave formation at top speed: 43 %
   Trim (Max stability = 0, Max steadiness = 100): 35
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 6.56 ft / 2.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:         16.40 ft / 5.00 m
      - Forecastle (20 %):      13.12 ft / 4.00 m
      - Mid (50 %):      9.84 ft / 3.00 m
      - Quarterdeck (15 %):   10.66 ft / 3.25 m
      - Stern:         11.48 ft / 3.50 m
      - Average freeboard:      11.58 ft / 3.53 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 56.0 %
      - Above water (accommodation/working, high = better): 100.2 %
   Waterplane Area: 5,394 Square feet or 501 Square metres
   Displacement factor (Displacement / loading): 235 %
   Structure weight / hull surface area: 66 lbs/sq ft or 321 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 1.38
      - Longitudinal: 3.61
      - Overall: 1.52
   Hull space for machinery, storage, compartmentation is excellent
   Room for accommodation and workspaces is adequate
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather