Brandenburgian Ships for 1909

[swamphen]

With the kaufmannjaeger design being bumped back to 1909 by the war, it was decided to take a second look at the design with the aim of making the ships cheaper (and, thus, more expendable). A small reduction in size and a cut in armament - noting that these vessels aren't intended to be used in the traditional cruiser roles their previous incarnation would have been somewhat suitable for - reduces the cost (in both $ and BP) and makes them more "concealable" for the Merchantile Hunter role (i.e. disguising the 4" guns as cargo-loading booms). An increase in misc. weight allows for more booty to be taken, as well as a secondary minelaying role.


SMS Orion, Brandenburgian Kaufmannjaeger laid down 1909

Displacement:
   2,900 t light; 2,978 t standard; 3,596 t normal; 4,091 t full load

Dimensions: Length overall / water x beam x draught
   396.98 ft / 393.70 ft x 39.37 ft x 16.24 ft (normal load)
   121.00 m / 120.00 m x 12.00 m  x 4.95 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 - 1.97" / 50.0 mm guns in single mounts, 3.86lbs / 1.75kg shells, 1903 Model
     Quick firing guns in deck mounts
     on side ends, evenly spread
      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

   Weight of broadside 86 lbs / 39 kg
   Shells per gun, main battery: 115

   4 - 17.7" / 450 mm above water torpedoes
   20 1500kg or 30 350kg mines

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:      0.79" / 20 mm   328.08 ft / 100.00 m   13.12 ft / 4.00 m
   Ends:      Unarmoured
     Main Belt covers 128 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:      0.79" / 20 mm   0.39" / 10 mm      0.79" / 20 mm
   2nd:      0.59" / 15 mm         -               -

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

Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 3 shafts, 27,000 shp / 20,142 Kw = 27.07 kts
   Range 10,000nm at 10.00 kts (Bunkerage = 1,113 tons) (75% coal)

Complement:
   231 - 301

Cost:
   £0.295 million / $1.180 million

Distribution of weights at normal displacement:
   Armament: 11 tons, 0.3 %
   Armour: 302 tons, 8.4 %
      - Belts: 136 tons, 3.8 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 6 tons, 0.2 %
      - Armour Deck: 150 tons, 4.2 %
      - Conning Tower: 10 tons, 0.3 %
   Machinery: 1,317 tons, 36.6 %
   Hull, fittings & equipment: 1,170 tons, 32.5 %
   Fuel, ammunition & stores: 696 tons, 19.4 %
   Miscellaneous weights: 100 tons, 2.8 %
      - 50 tons, cargo space
      - 20 tons, rescue equipment
      - 20 tons, minelaying equipment
      - 10 tons, Markoni room

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     3,034 lbs / 1,376 Kg = 85.9 x 4.1 " / 105 mm shells or 0.7 torpedoes
   Stability (Unstable if below 1.00): 1.37
   Metacentric height 2.1 ft / 0.7 m
   Roll period: 11.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.06
   Seaboat quality  (Average = 1.00): 1.51

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0.500
   Length to Beam Ratio: 10.00 : 1
   'Natural speed' for length: 19.84 kts
   Power going to wave formation at top speed: 58 %
   Trim (Max stability = 0, Max steadiness = 100): 47
   Bow angle (Positive = bow angles forward): -5.00 degrees
   Stern overhang: 3.28 ft / 1.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:         26.25 ft / 8.00 m
      - Forecastle (20 %):      21.33 ft / 6.50 m
      - Mid (45 %):      19.69 ft / 6.00 m (11.48 ft / 3.50 m aft of break)
      - Quarterdeck (15 %):   11.48 ft / 3.50 m
      - Stern:         11.48 ft / 3.50 m
      - Average freeboard:      16.10 ft / 4.91 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 124.2 %
      - Above water (accommodation/working, high = better): 111.2 %
   Waterplane Area: 10,327 Square feet or 959 Square metres
   Displacement factor (Displacement / loading): 115 %
   Structure weight / hull surface area: 59 lbs/sq ft or 288 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.91
      - Longitudinal: 2.29
      - 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