Ottoman Torpedo Boat, 750 tons

[miketr]

OE-TB-1911, Ottoman Empire Large Torpedo Boat laid down 1911 (Engine 1909)

Displacement:
   750 t light; 777 t standard; 835 t normal; 882 t full load

Dimensions: Length overall / water x beam x draught
   229.66 ft / 229.66 ft x 24.61 ft x 9.84 ft (normal load)
   70.00 m / 70.00 m x 7.50 m  x 3.00 m

Armament:
      2 - 4.13" / 105 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1911 Model
     Quick firing guns in deck mounts
     on centreline ends, evenly spread
      4 - 0.59" / 15.0 mm guns in single mounts, 0.10lbs / 0.05kg shells, 1911 Model
     Breech loading guns in deck mounts
     on side, all amidships
   Weight of broadside 71 lbs / 32 kg
   Shells per gun, main battery: 250
   4 - 18.0" / 457.2 mm above water torpedoes

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.97" / 50 mm         -               -

Machinery:
   Coal fired boilers, steam turbines,
   Direct drive, 2 shafts, 20,014 shp / 14,931 Kw = 29.00 kts
   Range 2,000nm at 10.00 kts
   Bunker at max displacement = 105 tons (100% coal)

Complement:
   76 - 100

Cost:
   £0.099 million / $0.394 million

Distribution of weights at normal displacement:
   Armament: 9 tons, 1.1 %
   Armour: 9 tons, 1.1 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 9 tons, 1.1 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 463 tons, 55.5 %
   Hull, fittings & equipment: 246 tons, 29.5 %
   Fuel, ammunition & stores: 85 tons, 10.2 %
   Miscellaneous weights: 23 tons, 2.8 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     215 lbs / 97 Kg = 6.1 x 4.1 " / 105 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.15
   Metacentric height 0.8 ft / 0.2 m
   Roll period: 11.6 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.22
   Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.526
   Length to Beam Ratio: 9.33 : 1
   'Natural speed' for length: 15.15 kts
   Power going to wave formation at top speed: 75 %
   Trim (Max stability = 0, Max steadiness = 100): 69
   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:      19.69 ft / 6.00 m
      - Forecastle (20 %):   16.40 ft / 5.00 m
      - Mid (50 %):      13.12 ft / 4.00 m
      - Quarterdeck (15 %):   11.48 ft / 3.50 m
      - Stern:      11.48 ft / 3.50 m
      - Average freeboard:   14.00 ft / 4.27 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 190.7 %
      - Above water (accommodation/working, high = better): 83.3 %
   Waterplane Area: 3,855 Square feet or 358 Square metres
   Displacement factor (Displacement / loading): 40 %
   Structure weight / hull surface area: 25 lbs/sq ft or 124 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 5.41
      - Overall: 0.63
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is cramped
   Ship has slow, easy roll, a good, steady gun platform

Misc 23 tons: 10 tons light radio, 4 tons 4 torpedoes & 9 tons construction reserve

[Borys]

Hmmm ...

[The Rock Doctor]

This is a rather fat torpedo-boat.  With a leaner hull and a lower block-coefficient, an equally powerful ship could probably be built on less tonnage.

[miketr]

I made the huller thinner and longer, net result is another 0.75 knots on the same tonnage.

Michael

OE-TB-1911, Ottoman Empire Large Torpedo Boat laid down 1911 (Engine 1909)

Displacement:
   749 t light; 776 t standard; 834 t normal; 881 t full load

Dimensions: Length overall / water x beam x draught
   246.06 ft / 246.06 ft x 24.61 ft x 9.84 ft (normal load)
   75.00 m / 75.00 m x 7.50 m  x 3.00 m

Armament:
      2 - 4.13" / 105 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1911 Model
     Quick firing guns in deck mounts
     on centreline ends, evenly spread
      4 - 0.59" / 15.0 mm guns in single mounts, 0.10lbs / 0.05kg shells, 1911 Model
     Breech loading guns in deck mounts
     on side, all amidships
   Weight of broadside 71 lbs / 32 kg
   Shells per gun, main battery: 250
   4 - 18.0" / 457.2 mm above water torpedoes

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.97" / 50 mm         -               -

Machinery:
   Coal fired boilers, steam turbines,
   Direct drive, 2 shafts, 20,615 shp / 15,379 Kw = 29.75 kts
   Range 2,000nm at 10.00 kts
   Bunker at max displacement = 105 tons (100% coal)

Complement:
   76 - 100

Cost:
   £0.099 million / $0.396 million

Distribution of weights at normal displacement:
   Armament: 9 tons, 1.1 %
   Armour: 9 tons, 1.1 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 9 tons, 1.1 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 466 tons, 55.8 %
   Hull, fittings & equipment: 243 tons, 29.1 %
   Fuel, ammunition & stores: 85 tons, 10.2 %
   Miscellaneous weights: 23 tons, 2.8 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     207 lbs / 94 Kg = 5.9 x 4.1 " / 105 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.18
   Metacentric height 0.8 ft / 0.3 m
   Roll period: 11.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.20
   Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.490
   Length to Beam Ratio: 10.00 : 1
   'Natural speed' for length: 15.69 kts
   Power going to wave formation at top speed: 72 %
   Trim (Max stability = 0, Max steadiness = 100): 70
   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:      18.04 ft / 5.50 m
      - Forecastle (20 %):   13.94 ft / 4.25 m
      - Mid (50 %):      12.80 ft / 3.90 m
      - Quarterdeck (15 %):   11.65 ft / 3.55 m
      - Stern:      11.65 ft / 3.55 m
      - Average freeboard:   13.15 ft / 4.01 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 191.8 %
      - Above water (accommodation/working, high = better): 85.0 %
   Waterplane Area: 3,998 Square feet or 371 Square metres
   Displacement factor (Displacement / loading): 39 %
   Structure weight / hull surface area: 25 lbs/sq ft or 124 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 3.91
      - Overall: 0.61
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is cramped
   Ship has slow, easy roll, a good, steady gun platform

Misc 23 tons: 10 tons light radio, 4 tons 4 torpedoes & 9 tons construction reserve