Patrol boats

[swamphen]

TGB09 v3.0. Went to AOF. While this will require transporting oil to the various islands to ensure resupply, I'm already planning a small fleet of tankers anyway. Also increased the range to 3600nm @ 12 knots - which makes it a little cheaper too.  ;) And the freeboard was increased by 0.5m.

Seven ships of the class are planned.

SMS Pothos
SMS Teleute
SMS Morpheus
SMS Olethros
SMS Epithumia
SMS Aponia
SMS Mania


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, evenly spread, all raised mounts

   Weight of broadside 215 lbs / 97 kg
   Shells per gun, main battery: 125

   2 - 17.7" / 450 mm above water torpedoes

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

   - Armour deck: 0.79" / 20 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: 86 tons, 7.3 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 9 tons, 0.7 %
      - Armour Deck: 77 tons, 6.6 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 364 tons, 30.9 %
   Hull, fittings & equipment: 504 tons, 42.8 %
   Fuel, ammunition & stores: 177 tons, 15.0 %
   Miscellaneous weights: 20 tons, 1.7 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,204 lbs / 546 Kg = 34.1 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): 1.84

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: 48 lbs/sq ft or 232 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.86
      - Longitudinal: 3.76
      - 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

[swamphen]

Tweaked the designs some; the first is now a tick smaller, and has a secondary role as a transport to those island garrisons. The last I realied that with AOF the "protected cruiser" armour wasn't practical anymore, so I switched to a "unprotected cruiser" belt...

Vulkan class

SMS Vulkan
SMS Zeus
SMS Poseidon
SMS Hermes
SMS Apollo
SMS Ares
SMS Artemis
SMS Prometheus
SMS Epimetheus

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

***

Fury class

SMS Alecto
SMS Megaera
SMS Tisiphone

Brandenburgian Kanonbooten laid down 1909

Displacement:
   1,155 t light; 1,229 t standard; 1,352 t normal; 1,450 t full load

Dimensions: Length overall / water x beam x draught
   237.86 ft / 229.66 ft x 38.06 ft x 10.83 ft (normal load)
   72.50 m / 70.00 m x 11.60 m  x 3.30 m

Armament:
      2 - 5.91" / 150 mm guns in single mounts, 99.21lbs / 45.00kg shells, 1909 Model
     Breech loading guns in deck mounts with hoists
     on centreline ends, evenly spread
      8 - 4.13" / 105 mm guns in single mounts, 35.27lbs / 16.00kg shells, 1905 Model
     Quick firing guns in casemate mounts
     on side, evenly spread
     8 guns in hull casemates - Limited use in all but light seas
      1 - 1.97" / 50.0 mm guns in single mounts, 3.86lbs / 1.75kg shells, 1903 Model
     Anti-airship gun in deck mount
     on centreline amidships
      4 - 1.46" / 37.0 mm guns in single mounts, 1.55lbs / 0.70kg shells, 1905 Model
     Quick firing guns in deck mounts
     on side ends, evenly spread, all raised mounts - superfiring
      4 - 0.30" / 7.7 mm guns in single mounts, 0.01lbs / 0.01kg shells, 1909 Model
     Machine guns in deck mounts
     on side, evenly spread, all raised mounts

   Weight of broadside 491 lbs / 223 kg
   Shells per gun, main battery: 150

   1 - 17.7" / 450 mm submerged torpedo tubes

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:      1.57" / 40 mm   229.66 ft / 70.00 m   9.84 ft / 3.00 m
   Upper:      0.79" / 20 mm   131.23 ft / 40.00 m   8.20 ft / 2.50 m
     Main Belt covers 154 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:      0.98" / 25 mm         -         0.79" / 20 mm
   2nd:      1.57" / 40 mm         -               -
   3rd:      0.79" / 20 mm         -               -

   - Armour deck: 0.79" / 20 mm, Conning tower: 1.97" / 50 mm

Machinery:
   Coal and oil fired boilers, reciprocating cruising steam engines plus steam

turbines,
   Direct drive, 3 shafts, 4,000 ihp / 2,984 Kw = 18.23 kts
   Range 3,500nm at 10.00 kts (Bunkerage = 221 tons) (90% coal)

Complement:
   110 - 144

Cost:
   £0.126 million / $0.505 million

Distribution of weights at normal displacement:
   Armament: 62 tons, 4.6 %
   Armour: 296 tons, 21.9 %
      - Belts: 170 tons, 12.6 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 36 tons, 2.7 %
      - Armour Deck: 85 tons, 6.3 %
      - Conning Tower: 5 tons, 0.4 %
   Machinery: 240 tons, 17.8 %
   Hull, fittings & equipment: 506 tons, 37.5 %
   Fuel, ammunition & stores: 197 tons, 14.6 %
   Miscellaneous weights: 50 tons, 3.7 %
      - Markoni room, 20 tons
      - Command facilities, 10 tons
      - Cargo space, 15 tons
      - Torpedoes, 5 per tube, 5 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,901 lbs / 862 Kg = 18.5 x 5.9 " / 150 mm shells or 0.7 torpedoes
   Stability (Unstable if below 1.00): 1.32
   Metacentric height 1.9 ft / 0.6 m
   Roll period: 11.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.32
   Seaboat quality  (Average = 1.00): 1.52

Hull form characteristics:
   Hull has raised forecastle
   Block coefficient: 0.500
   Length to Beam Ratio: 6.03 : 1
   'Natural speed' for length: 15.15 kts
   Power going to wave formation at top speed: 57 %
   Trim (Max stability = 0, Max steadiness = 100): 47
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 8.20 ft / 2.50 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:         14.76 ft / 4.50 m
      - Forecastle (5 %):      13.94 ft / 4.25 m (13.12 ft / 4.00 m aft of break)
      - Mid (50 %):      12.30 ft / 3.75 m
      - Quarterdeck (15 %):   12.30 ft / 3.75 m
      - Stern:         13.12 ft / 4.00 m
      - Average freeboard:      12.65 ft / 3.86 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 102.0 %
      - Above water (accommodation/working, high = better): 126.4 %
   Waterplane Area: 5,823 Square feet or 541 Square metres
   Displacement factor (Displacement / loading): 102 %
   Structure weight / hull surface area: 56 lbs/sq ft or 274 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.88
      - Longitudinal: 3.26
      - 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
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

***

Endless class

SMS Pothos
SMS Teleute
SMS Morpheus
SMS Olethros
SMS Epithumia
SMS Aponia
SMS Mania

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]

Bump.

Vulkan and Pothos classes are being built as per final designs just above.  Patrol boats have their uses.

On the other hand, I don't see a niche for the Alecto class, so no building for them.