III. (g) Vorpostenbooten (Patrol Boats)

[The Rock Doctor]

Patrol Boats of the Hochseesflotte

SMS Pothos
SMS Teleute
SMS Morpheus
SMS Olethros
SMS Epitheumia
SMS Aponia
SMS Mania
SMS Mantus
SMS Panther
SMS Lowe
SMS Delfin
SMS Mowe

[The Rock Doctor]

Endless class

SMS Pothos, laid down 1909
SMS Teleute, laid down 1909
SMS Morpheus, laid down 1909
SMS Olethros, laid down 1909
SMS Epitheumia, laid down 1910
SMS Aponia, laid down 1910
SMS Mania, laid down 1911
SMS Mantus, laid down 1911

Brandenburgian Torpedo Gunboat laid down 1909

Displacement:
   1,000 t light; 1,041 t standard; 1,177 t normal; 1,286 t full load

Dimensions: Length overall / water x beam x draught
   278.87 ft / 278.87 ft x 30.84 ft x 11.98 ft (normal load)
   85.00 m / 85.00 m x 9.40 m  x 3.65 m

Armament:
      2 - 4.13" / 105 mm guns in single mounts, 35.27lbs / 16.00kg shells, 1905 Model
     Breech loading guns in deck mounts with hoists
     on centreline ends, evenly spread
      4 - 4.13" / 105 mm guns in single mounts, 35.27lbs / 16.00kg shells, 1905 Model
     Quick firing guns in deck mounts
     on side ends, evenly spread
      2 - 1.46" / 37.0 mm guns in single mounts, 1.55lbs / 0.70kg shells, 1905 Model
     Quick firing guns in deck mounts
     on side, all amidships, all raised mounts - superfiring
      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 aft, all raised mounts - superfiring
   Weight of broadside 215 lbs / 97 kg
   Shells per gun, main battery: 125
   2 - 17.7" / 450 mm above water torpedoes

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:      0.79" / 20 mm   278.87 ft / 85.00 m   9.84 ft / 3.00 m
     Main Belt covers 154 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:      0.79" / 20 mm         -               -
   2nd:      0.59" / 15 mm         -               -

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 8,000 shp / 5,968 Kw = 23.14 kts
   Range 3,600nm at 12.00 kts (Bunkerage = 245 tons)

Complement:
   99 - 130

Cost:
   £0.108 million / $0.434 million

Distribution of weights at normal displacement:
   Armament: 27 tons, 2.3 %
   Armour: 89 tons, 7.5 %
      - Belts: 80 tons, 6.8 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 9 tons, 0.7 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 364 tons, 30.9 %
   Hull, fittings & equipment: 501 tons, 42.6 %
   Fuel, ammunition & stores: 177 tons, 15.0 %
   Miscellaneous weights: 20 tons, 1.7 %
      - Markoni room, 10 tons
      - Torpedoes, 2 per tube, 4 tons
      - Cargo space, 6 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,198 lbs / 544 Kg = 33.9 x 4.1 " / 105 mm shells or 0.5 torpedoes
   Stability (Unstable if below 1.00): 1.31
   Metacentric height 1.4 ft / 0.4 m
   Roll period: 11.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 72 %
         - Recoil effect (Restricted arc if above 1.00): 0.32
   Seaboat quality  (Average = 1.00): 1.85

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0.400
   Length to Beam Ratio: 9.04 : 1
   'Natural speed' for length: 16.70 kts
   Power going to wave formation at top speed: 55 %
   Trim (Max stability = 0, Max steadiness = 100): 39
   Bow angle (Positive = bow angles forward): -10.00 degrees
   Stern overhang: -3.28 ft / -1.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:         20.01 ft / 6.10 m
      - Forecastle (20 %):      18.04 ft / 5.50 m
      - Mid (40 %):      16.40 ft / 5.00 m (9.84 ft / 3.00 m aft of break)
      - Quarterdeck (15 %):   9.84 ft / 3.00 m
      - Stern:         9.84 ft / 3.00 m
      - Average freeboard:      13.12 ft / 4.00 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 119.7 %
      - Above water (accommodation/working, high = better): 109.3 %
   Waterplane Area: 5,294 Square feet or 492 Square metres
   Displacement factor (Displacement / loading): 112 %
   Structure weight / hull surface area: 47 lbs/sq ft or 231 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.86
      - Longitudinal: 3.74
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is cramped
   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

[The Rock Doctor]

Panther Class

These are gunboats designed for coastal escort and patrol work in environments where enemy light craft may be a hazard.  The lead units are named for kanonbooten lost in the Second Pacific War.

The design is based on the historical Dutch Bruno class, and would look fairly similar.

SMS Panther, laid down 1912
SMS Lowe, laid down 1912
SMS Delfin, laid down 1912
SMS Mowe, laid down 1912



Enter ship name, Enter country Enter ship type laid down 1912

Displacement:
   542 t light; 576 t standard; 635 t normal; 682 t full load

Dimensions: Length overall / water x beam x draught
   213.25 ft / 213.25 ft x 26.25 ft x 7.22 ft (normal load)
   65.00 m / 65.00 m x 8.00 m  x 2.20 m

Armament:
      2 - 4.13" / 105 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1912 Model
     Breech loading guns in deck mounts with hoists
     on centreline ends, evenly spread
      2 - 4.13" / 105 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1912 Model
     Breech loading guns in deck mounts with hoists
     on side, all amidships
      2 - 0.31" / 8.0 mm guns in single mounts, 0.02lbs / 0.01kg shells, 1912 Model
     Machine guns in deck mounts
     on side, evenly spread
   Weight of broadside 141 lbs / 64 kg
   Shells per gun, main battery: 250

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   1.97" / 50 mm   138.62 ft / 42.25 m   8.01 ft / 2.44 m
   Ends:   0.98" / 25 mm     74.61 ft / 22.74 m   8.01 ft / 2.44 m
     Main Belt covers 100 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.98" / 25 mm         -         0.98" / 25 mm
   2nd:   0.98" / 25 mm         -               -
   3rd:   0.39" / 10 mm         -               -

   - Armour deck: 0.59" / 15 mm, Conning tower: 1.97" / 50 mm

Machinery:
   Coal and oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 1,200 shp / 895 Kw = 15.03 kts
   Range 3,300nm at 10.00 kts (Bunkerage = 105 tons)

Complement:
   63 - 82

Cost:
   £0.041 million / $0.163 million

Distribution of weights at normal displacement:
   Armament: 18 tons, 2.8 %
   Armour: 169 tons, 26.7 %
      - Belts: 115 tons, 18.1 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 9 tons, 1.4 %
      - Armour Deck: 43 tons, 6.7 %
      - Conning Tower: 3 tons, 0.5 %
   Machinery: 50 tons, 7.9 %
   Hull, fittings & equipment: 284 tons, 44.8 %
   Fuel, ammunition & stores: 93 tons, 14.7 %
   Miscellaneous weights: 20 tons, 3.2 %
-5 t:  Short-range wireless
-15 t:  Weight reserve

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,791 lbs / 812 Kg = 50.7 x 4.1 " / 105 mm shells or 1.1 torpedoes
   Stability (Unstable if below 1.00): 1.20
   Metacentric height 0.9 ft / 0.3 m
   Roll period: 11.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.55
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has raised forecastle
   Block coefficient: 0.550
   Length to Beam Ratio: 8.13 : 1
   'Natural speed' for length: 14.60 kts
   Power going to wave formation at top speed: 45 %
   Trim (Max stability = 0, Max steadiness = 100): 35
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      13.78 ft / 4.20 m
      - Forecastle (20 %):   13.78 ft / 4.20 m (10.01 ft / 3.05 m aft of break)
      - Mid (50 %):      10.01 ft / 3.05 m
      - Quarterdeck (15 %):   10.01 ft / 3.05 m
      - Stern:      10.01 ft / 3.05 m
      - Average freeboard:   10.76 ft / 3.28 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 53.3 %
      - Above water (accommodation/working, high = better): 118.2 %
   Waterplane Area: 3,906 Square feet or 363 Square metres
   Displacement factor (Displacement / loading): 147 %
   Structure weight / hull surface area: 42 lbs/sq ft or 204 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.88
      - Longitudinal: 3.05
      - Overall: 1.00
   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