III. (f) Küstenschutzschiffen (Coast Guard Vessels)

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III. Korvetten (Avisos).
..(f) Küstenschutzschiffen (Coast Guard Vessels).
.....SMS Martin Luther

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Martin Luther class

SMS Martin Luther, laid down 1908
SMS K-2 to K-21, laid down 1910 (K-5 to K-8 SUNK 14 October 1916 defending Sint Anzelm)
SMS K-22 to K-32, laid down 1911
SMS K-33 to K-36, laid down 1912

Brandenburgian Revenue Cutter laid down 1908 (Engine 1909)

Displacement:
   26 t light; 27 t standard; 28 t normal; 28 t full load

Dimensions: Length overall / water x beam x draught
   82.02 ft / 82.02 ft x 11.98 ft x 3.28 ft (normal load)
   25.00 m / 25.00 m x 3.65 m  x 1.00 m

Armament:
     1 - 1.97" / 50.0 mm guns in single mounts, 3.86lbs / 1.75kg shells, 1905 Model
     Quick firing gun in deck mount
     on centreline forward
     1 - 0.30" / 7.7 mm guns in single mounts, 0.01lbs / 0.01kg shells, 1908 Model
     Machine gun in deck mount
     on centreline aft

   Weight of broadside 4 lbs / 2 kg
   Shells per gun, main battery: 150

Machinery:
   Diesel Internal combustion motors,
   Direct drive, 2 shafts, 80 shp / 60 Kw = 11.65 kts
   Range 200nm at 5.00 kts (Bunkerage = 0 tons)

Complement:
   5 - 7

Cost:
   £0.002 million / $0.007 million

Distribution of weights at normal displacement:
   Armament: 0 tons, 1.7 %
   Machinery: 4 tons, 13.2 %
   Hull, fittings & equipment: 17 tons, 62.9 %
   Fuel, ammunition & stores: 1 tons, 4.1 %
   Miscellaneous weights: 5 tons, 18.1 %
   - 5 tons, Markoni set

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     80 lbs / 37 Kg = 21.1 x 2.0 " / 50 mm shells or 0.3 torpedoes
   Stability (Unstable if below 1.00): 1.11
   Metacentric height 0.3 ft / 0.1 m
   Roll period: 10.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 52 %
         - Recoil effect (Restricted arc if above 1.00): 0.11
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0.300
   Length to Beam Ratio: 6.85 : 1
   'Natural speed' for length: 9.06 kts
   Power going to wave formation at top speed: 47 %
   Trim (Max stability = 0, Max steadiness = 100): 26
   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:         5.74 ft / 1.75 m
      - Forecastle (15 %):      5.58 ft / 1.70 m
      - Mid (20 %):      5.41 ft / 1.65 m (4.92 ft / 1.50 m aft of break)
      - Quarterdeck (15 %):   4.92 ft / 1.50 m
      - Stern:         4.92 ft / 1.50 m
      - Average freeboard:      5.06 ft / 1.54 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 76.6 %
      - Above water (accommodation/working, high = better): 119.3 %
   Waterplane Area: 631 Square feet or 59 Square metres
   Displacement factor (Displacement / loading): 171 %
   Structure weight / hull surface area: 16 lbs/sq ft or 78 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.88
      - Longitudinal: 7.38
      - Overall: 1.09
   Hull space for machinery, storage, compartmentation is excellent
   Room for accommodation and workspaces is adequate
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather