Ottoman Small Torpedo Boat Competition

Guinness · December 19, 2009, 12:02:57 PM

The Ottomans have identified a requirement for a small (some might say very small) torpedo boat suitable for coast defense operations, and limited short range offensive operations, while also being useful for some patrol and customs missions in peacetime. In concept this ship might be fairly similar to the CSA's 250t torpedo boats.

The Ottomans are interested in either purchasing foreign built boats, or in contracting a foreign company or government for design services.

The major requirements are:

- Small size. It is hoped that something smaller than 200t light might be procured.
- One or more 21" (two ton) torpedoes
- Capacity for small offensive mine load either in addition to, or in place of the torpedoes
- Minimal seakeeping sufficient for Mediterranean and Red Rea operations
- Sustained speed in a sea way of 27 knots (ie the Spring Sharp top speed)
- Range of 2400nm at 12 knots, or 3500 at 10 knots
- Gun armament suitable for minimal self defense and for dealing with small craft. A gun up to 75mm is thought to provide usefulness in peacetime patrol missions (ie firing across bows) and in limited tactical situations, but is not a requirement.

Motor Torpedo Boats will be considered in this competition, but the Ottomans have little experience with the type, and are concerned about their additional costs and later maintenance issues. So if MTBs are to be acquired, they would likely need to be as part of a package which includes transmission of necessary technical knowledge and support to assure they can be kept in service in the future.

The numbers to be procured can be expected to be fairly sizable: At least 20 starting around 1920, with the possibility for long-term production in following years.

As part of the preparation for the competition, the Ottoman Navy's design department prepared the following design as a baseline:

Quote
200t Coastal Torpedo Boat, Ottoman Empire Torpedo Boat laid down 1920 (Engine 1916)

Displacement:
   200 t light; 206 t standard; 232 t normal; 253 t full load

Dimensions: Length overall / water x beam x draught
   180.45 ft / 180.45 ft x 18.04 ft x 6.56 ft (normal load)
   55.00 m / 55.00 m x 5.50 m x 2.00 m

Armament:
1 - 2.95" / 75.0 mm guns in single mounts, 12.87lbs / 5.84kg shells, 1920 Model
     Quick firing gun in deck mount
     on centreline forward
2 - 1.85" / 47.0 mm guns in single mounts, 3.17lbs / 1.44kg shells, 1920 Model
     Quick firing guns in deck mounts
     on side, all aft
2 - 0.51" / 13.0 mm guns in single mounts, 0.07lbs / 0.03kg shells, 1920 Model
     Machine guns in deck mounts
     on centreline, all amidships
   Weight of broadside 19 lbs / 9 kg
   Shells per gun, main battery: 150
   2 - 21.0" / 533 mm above water torpedoes

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 1 shaft, 7,000 shp / 5,222 Kw = 27.29 kts
   Range 221nm at 27.29 kts
   Bunker at max displacement = 47 tons

Complement:
   29 - 38

Cost:
   £0.062 million / $0.248 million

Distribution of weights at normal displacement:
   Armament: 2 tons, 1.0 %
   Machinery: 123 tons, 52.9 %
   Hull, fittings & equipment: 69 tons, 29.5 %
   Fuel, ammunition & stores: 32 tons, 14.0 %
   Miscellaneous weights: 6 tons, 2.6 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     60 lbs / 27 Kg = 4.7 x 3.0 " / 75 mm shells or 0.1 torpedoes
   Stability (Unstable if below 1.00): 1.20
   Metacentric height 0.5 ft / 0.2 m
   Roll period: 10.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.10
   Seaboat quality (Average = 1.00): 0.71

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.380
   Length to Beam Ratio: 10.00 : 1
   'Natural speed' for length: 13.43 kts
   Power going to wave formation at top speed: 71 %
   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:      9.84 ft / 3.00 m
     - Forecastle (17 %):   8.53 ft / 2.60 m
     - Mid (45 %):      7.22 ft / 2.20 m
     - Quarterdeck (9 %):   7.22 ft / 2.20 m
     - Stern:      7.22 ft / 2.20 m
     - Average freeboard:   7.71 ft / 2.35 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 181.5 %
      - Above water (accommodation/working, high = better): 53.0 %
   Waterplane Area: 1,873 Square feet or 174 Square metres
   Displacement factor (Displacement / loading): 42 %
   Structure weight / hull surface area: 18 lbs/sq ft or 86 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 2.09
      - Overall: 0.57
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is cramped
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

Misc Weight:
4t: 2x21" Torpedoes
2t: Reserve
- or -
6t: Mines

Ranges:
@10 Knots: 3730nm
@12 Knots: 2420nm
@15 Knots: 1360nm
@20 Knots: 598nm (29.9 hours)
@25 Knots: 295nm (11.8 hours)
@Max Speed: 221nm (8 hours)

Expected Trialspeed: 32.57 knots

TexanCowboy · December 19, 2009, 12:25:18 PM

I hope by smaller than 200, you won't discount designs that are 202 tons. The CSA submits this entry. It mounts a heavier gun than your design, with better seakeeping, and more torpedoes. This ship can mount either three torpedoes and 9 depth charges, or 8 mines and 3 depth charges, making it more multi-purpose.

Haiti, CSA Civilian TB laid down 1920

Displacement:
   202 t light; 208 t standard; 230 t normal; 247 t full load

Dimensions: Length overall / water x beam x draught
   200.96 ft / 200.00 ft x 16.80 ft x 6.30 ft (normal load)
   61.25 m / 60.96 m x 5.12 m x 1.92 m

Armament:
1 - 3.50" / 88.9 mm guns in single mounts, 21.44lbs / 9.72kg shells, 1920 Model
     Breech loading gun in deck mount
     on centreline aft
2 - 1.00" / 25.4 mm guns in single mounts, 0.50lbs / 0.23kg shells, 1920 Model
     Machine guns in deck mounts
     on centreline ends, evenly spread
   Weight of broadside 22 lbs / 10 kg
   Shells per gun, main battery: 150
   3 - 21.0" / 533.4 mm above water torpedoes

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 1 shaft, 6,064 shp / 4,524 Kw = 27.00 kts
   Range 3,500nm at 10.00 kts
   Bunker at max displacement = 39 tons

Complement:
   29 - 38

Cost:
   £0.061 million / $0.243 million

Distribution of weights at normal displacement:
   Armament: 3 tons, 1.2 %
   Machinery: 116 tons, 50.5 %
   Hull, fittings & equipment: 74 tons, 32.2 %
   Fuel, ammunition & stores: 28 tons, 12.2 %
   Miscellaneous weights: 9 tons, 3.9 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     66 lbs / 30 Kg = 3.1 x 3.5 " / 89 mm shells or 0.1 torpedoes
   Stability (Unstable if below 1.00): 1.20
   Metacentric height 0.5 ft / 0.1 m
   Roll period: 10.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.16
   Seaboat quality (Average = 1.00): 1.00

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.380
   Length to Beam Ratio: 11.90 : 1
   'Natural speed' for length: 14.14 kts
   Power going to wave formation at top speed: 66 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 5.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
     - Stem:      11.00 ft / 3.35 m
     - Forecastle (20 %):   7.70 ft / 2.35 m
     - Mid (50 %):      7.70 ft / 2.35 m
     - Quarterdeck (15 %):   7.70 ft / 2.35 m
     - Stern:      7.70 ft / 2.35 m
     - Average freeboard:   7.96 ft / 2.43 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 176.8 %
      - Above water (accommodation/working, high = better): 37.6 %
   Waterplane Area: 1,933 Square feet or 180 Square metres
   Displacement factor (Displacement / loading): 50 %
   Structure weight / hull surface area: 17 lbs/sq ft or 82 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 2.12
      - Overall: 0.58
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is extremely poor

6t: 3 torpedoes
3t: 9 depth charges

OR
8t: 8 mines
1t: 3 depth charges

Trial Speed: 32.05 knots

Guinness · December 19, 2009, 12:59:50 PM

Interesting. The Ottomans certainly aren't thinking much about ASW right now...

I've posted what I think the current Ottoman Naval artillery roster is here: http://www.navalism.org/index.php?topic=4574.0

Do you think if you designed it for some Ottoman armament you could trim off those last two tons?

Logi · December 19, 2009, 01:59:14 PM

How about this? You either load torpedoes or mines, but you get a heavier firepower on the boat for it.

QuoteTB19, RRC Torpedo Boat laid down 1919 (Engine 1916)

Displacement:
   200 t light; 208 t standard; 235 t normal; 256 t full load

Dimensions: Length overall / water x beam x draught
   200.00 ft / 200.00 ft x 19.00 ft x 5.70 ft (normal load)
   60.96 m / 60.96 m x 5.79 m x 1.74 m

Armament:
3 - 2.95" / 75.0 mm guns in single mounts, 12.87lbs / 5.84kg shells, 1919 Model
    Quick firing guns in deck mounts
    on centreline ends, majority forward, 1 raised mount
4 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1919 Model
    Machine guns in deck mounts
    on side, evenly spread
   Weight of broadside 39 lbs / 18 kg
   Shells per gun, main battery: 150
   3 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.25" / 6 mm    -          -
   2nd:   0.25" / 6 mm    -          -

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 1 shaft, 6,268 shp / 4,676 Kw = 27.00 kts
   Range 2,500nm at 12.00 kts
   Bunker at max displacement = 48 tons

Complement:
   29 - 39

Cost:
   £0.060 million / $0.241 million

Distribution of weights at normal displacement:
   Armament: 5 tons, 2.1 %
   Armour: 1 tons, 0.5 %
    - Belts: 0 tons, 0.0 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 1 tons, 0.5 %
    - Armour Deck: 0 tons, 0.0 %
    - Conning Tower: 0 tons, 0.0 %
   Machinery: 118 tons, 50.2 %
   Hull, fittings & equipment: 73 tons, 31.2 %
   Fuel, ammunition & stores: 35 tons, 14.8 %
   Miscellaneous weights: 3 tons, 1.3 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
    67 lbs / 31 Kg = 5.2 x 3.0 " / 75 mm shells or 0.1 torpedoes
   Stability (Unstable if below 1.00): 1.31
   Metacentric height 0.7 ft / 0.2 m
   Roll period: 9.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.17
   Seaboat quality (Average = 1.00): 0.80

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.380
   Length to Beam Ratio: 10.53 : 1
   'Natural speed' for length: 14.14 kts
   Power going to wave formation at top speed: 67 %
   Trim (Max stability = 0, Max steadiness = 100): 62
   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:      13.00 ft / 3.96 m
    - Forecastle (20 %):   9.00 ft / 2.74 m
    - Mid (50 %):      7.00 ft / 2.13 m
    - Quarterdeck (15 %):   6.00 ft / 1.83 m
    - Stern:      6.30 ft / 1.92 m
    - Average freeboard:   7.72 ft / 2.35 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 179.4 %
      - Above water (accommodation/working, high = better): 47.1 %
   Waterplane Area: 2,186 Square feet or 203 Square metres
   Displacement factor (Displacement / loading): 46 %
   Structure weight / hull surface area: 18 lbs/sq ft or 86 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.50
      - Overall: 0.55
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is extremely poor
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

Trail Speed = 32.02 kts

TexanCowboy · December 19, 2009, 02:07:09 PM

No, I didn't. It says starting in 1920. I will have 1920 engine tech by then.

EDIT: and your torpedeos are 1 ton. He said 2 ton torpedoes.

Logi · December 19, 2009, 02:09:50 PM

So you're selling... I was thinking it was a design for the Ottomans to self-build.

QuoteTB19, RRC Torpedo Boat laid down 1919 (Engine 1916)

Displacement:
   200 t light; 208 t standard; 235 t normal; 256 t full load

Dimensions: Length overall / water x beam x draught
   200.00 ft / 200.00 ft x 19.00 ft x 5.70 ft (normal load)
   60.96 m / 60.96 m x 5.79 m x 1.74 m

Armament:
3 - 2.95" / 75.0 mm guns in single mounts, 12.87lbs / 5.84kg shells, 1919 Model
    Quick firing guns in deck mounts
    on centreline ends, majority forward, 1 raised mount
4 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1919 Model
    Machine guns in deck mounts
    on side, evenly spread
   Weight of broadside 39 lbs / 18 kg
   Shells per gun, main battery: 150
   3 - 21.0" / 533.4 mm above water torpedoes

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 1 shaft, 6,268 shp / 4,676 Kw = 27.00 kts
   Range 2,500nm at 12.00 kts
   Bunker at max displacement = 48 tons

Complement:
   29 - 39

Cost:
   £0.060 million / $0.241 million

Distribution of weights at normal displacement:
   Armament: 5 tons, 2.1 %
   Machinery: 118 tons, 50.1 %
   Hull, fittings & equipment: 72 tons, 30.5 %
   Fuel, ammunition & stores: 35 tons, 14.8 %
   Miscellaneous weights: 6 tons, 2.6 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
    65 lbs / 30 Kg = 5.1 x 3.0 " / 75 mm shells or 0.1 torpedoes
   Stability (Unstable if below 1.00): 1.27
   Metacentric height 0.6 ft / 0.2 m
   Roll period: 10.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.18
   Seaboat quality (Average = 1.00): 0.77

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.380
   Length to Beam Ratio: 10.53 : 1
   'Natural speed' for length: 14.14 kts
   Power going to wave formation at top speed: 67 %
   Trim (Max stability = 0, Max steadiness = 100): 65
   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:      12.00 ft / 3.66 m
    - Forecastle (20 %):   9.00 ft / 2.74 m
    - Mid (50 %):      7.00 ft / 2.13 m
    - Quarterdeck (15 %):   6.00 ft / 1.83 m
    - Stern:      5.00 ft / 1.52 m
    - Average freeboard:   7.54 ft / 2.30 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 180.3 %
      - Above water (accommodation/working, high = better): 47.1 %
   Waterplane Area: 2,186 Square feet or 203 Square metres
   Displacement factor (Displacement / loading): 46 %
   Structure weight / hull surface area: 18 lbs/sq ft or 86 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.39
      - Overall: 0.55
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is extremely poor
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

Trial Speed: 32.01 kts

Guinness · December 19, 2009, 02:40:58 PM

The Ottomans will consider an arrangement where we buy boats built in foreign yards with or without foreign armament, an arrangement where some smaller number of boats are built foreign, and then a license granted for the Ottomans to build more of them themselves, or simply buying a design and building it themselves.

In addition, boats might be completed without armament to be added by the Ottomans later.

Desertfox · December 21, 2009, 09:24:29 AM

Swiss entry...

TB-1, New Switzerland export Torpedo Boat laid down 1920

Displacement:
   201 t light; 208 t standard; 230 t normal; 248 t full load

Dimensions: Length overall / water x beam x draught
   230.00 ft / 230.00 ft x 20.00 ft x 4.60 ft (normal load)
   70.10 m / 70.10 m x 6.10 m x 1.40 m

Armament:
1 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1920 Model
    Quick firing gun in deck mount
    on centreline forward
1 - 1.85" / 47.0 mm guns in single mounts, 3.17lbs / 1.44kg shells, 1920 Model
    Quick firing gun in deck mount
    on centreline aft
2 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1920 Model
    Machine guns in deck mounts
    on side, evenly spread
   Weight of broadside 17 lbs / 8 kg
   Shells per gun, main battery: 200
   4 - 21.0" / 533.4 mm above water torpedoes

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 1 shaft, 5,662 shp / 4,224 Kw = 27.00 kts
   Range 2,400nm at 12.00 kts
   Bunker at max displacement = 40 tons

Complement:
   29 - 38

Cost:
   £0.059 million / $0.237 million

Distribution of weights at normal displacement:
   Armament: 2 tons, 0.9 %
   Machinery: 116 tons, 50.6 %
   Hull, fittings & equipment: 74 tons, 32.4 %
   Fuel, ammunition & stores: 29 tons, 12.6 %
   Miscellaneous weights: 8 tons, 3.5 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
    82 lbs / 37 Kg = 6.1 x 3.0 " / 76 mm shells or 0.1 torpedoes
   Stability (Unstable if below 1.00): 1.32
   Metacentric height 0.7 ft / 0.2 m
   Roll period: 9.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.07
   Seaboat quality (Average = 1.00): 0.75

Hull form characteristics:
   Hull has low quarterdeck
   Block coefficient: 0.380
   Length to Beam Ratio: 11.50 : 1
   'Natural speed' for length: 15.17 kts
   Power going to wave formation at top speed: 62 %
   Trim (Max stability = 0, Max steadiness = 100): 67
   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:      11.00 ft / 3.35 m
    - Forecastle (20 %):   8.00 ft / 2.44 m
    - Mid (50 %):      8.00 ft / 2.44 m
    - Quarterdeck (30 %):   5.00 ft / 1.52 m (8.00 ft / 2.44 m before break)
    - Stern:      5.00 ft / 1.52 m
    - Average freeboard:   7.34 ft / 2.24 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 174.5 %
      - Above water (accommodation/working, high = better): 55.7 %
   Waterplane Area: 2,647 Square feet or 246 Square metres
   Displacement factor (Displacement / loading): 55 %
   Structure weight / hull surface area: 17 lbs/sq ft or 82 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 0.83
      - Overall: 0.52
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is cramped
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

Guinness · December 29, 2009, 09:50:04 AM

While the Ottomans received all these designs well, in the end they wanted more speed, and asked in house designers to refine their own submission. This is the result. The Ottomans are still interested in contracting foreign yards to construct this or something like it. They expect to pay no less than $2 per BP expended, and might consider more expensive offers. Ships would be constructed and delivered without main armament, which the Ottomans would add themselves after delivery.

Please alert local Ottoman diplomatic contacts if your nation's shipbuilding industry is interested.

Quote
200t Coastal Torpedo Boat, Ottoman Empire Torpedo Boat laid down 1920 (Engine 1916)

Displacement:
   200 t light; 206 t standard; 240 t normal; 267 t full load

Dimensions: Length overall / water x beam x draught
   182.04 ft / 180.45 ft x 16.90 ft x 6.43 ft (normal load)
   55.49 m / 55.00 m x 5.15 m x 1.96 m

Armament:
1 - 2.95" / 75.0 mm guns in single mounts, 12.87lbs / 5.84kg shells, 1920 Model
    Quick firing gun in deck mount
    on centreline forward
2 - 1.85" / 47.0 mm guns in single mounts, 3.17lbs / 1.44kg shells, 1920 Model
    Quick firing guns in deck mounts
    on side, all aft
2 - 0.51" / 13.0 mm guns in single mounts, 0.07lbs / 0.03kg shells, 1920 Model
    Machine guns in deck mounts
    on centreline, all amidships
   Weight of broadside 19 lbs / 9 kg
   Shells per gun, main battery: 150
   2 - 21.0" / 532.9999 mm above water torpedoes

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

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 1 shaft, 9,000 shp / 6,714 Kw = 28.59 kts
   Range 1,729nm at 15.00 kts
   Bunker at max displacement = 60 tons
    Caution: Delicate, lightweight machinery

Complement:
   29 - 39

Cost:
   £0.065 million / $0.259 million

Distribution of weights at normal displacement:
   Armament: 2 tons, 1.0 %
   Armour: 1 tons, 0.4 %
    - Belts: 0 tons, 0.0 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 1 tons, 0.4 %
    - Armour Deck: 0 tons, 0.0 %
    - Conning Tower: 0 tons, 0.0 %
   Machinery: 131 tons, 54.7 %
   Hull, fittings & equipment: 59 tons, 24.6 %
   Fuel, ammunition & stores: 40 tons, 16.8 %
   Miscellaneous weights: 6 tons, 2.5 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
    45 lbs / 20 Kg = 3.5 x 3.0 " / 75 mm shells or 0.1 torpedoes
   Stability (Unstable if below 1.00): 1.09
   Metacentric height 0.4 ft / 0.1 m
   Roll period: 11.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 37 %
         - Recoil effect (Restricted arc if above 1.00): 0.10
   Seaboat quality (Average = 1.00): 0.31

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0.428
   Length to Beam Ratio: 10.68 : 1
   'Natural speed' for length: 13.43 kts
   Power going to wave formation at top speed: 74 %
   Trim (Max stability = 0, Max steadiness = 100): 86
   Bow angle (Positive = bow angles forward): 9.50 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
    - Stem:      9.51 ft / 2.90 m
    - Forecastle (14 %):   9.19 ft / 2.80 m
    - Mid (33 %):      9.02 ft / 2.75 m (5.09 ft / 1.55 m aft of break)
    - Quarterdeck (10 %):   5.09 ft / 1.55 m
    - Stern:      5.09 ft / 1.55 m
    - Average freeboard:   6.44 ft / 1.96 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 187.1 %
      - Above water (accommodation/working, high = better): 40.0 %
   Waterplane Area: 1,815 Square feet or 169 Square metres
   Displacement factor (Displacement / loading): 34 %
   Structure weight / hull surface area: 17 lbs/sq ft or 83 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.22
      - Overall: 0.54
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is extremely poor
   Caution: Lacks seaworthiness - very limited seakeeping ability

Misc Weight:
4t: 2x21" Torpedoes
2t: Reserve
- or -
6t: Mines

Range at max speed: 230nm, or 8 hours
Trial Speed: 34 knots

Guinness · December 30, 2009, 05:29:09 PM

This is coming along...

Here's a teaser:

Jefgte · December 30, 2009, 05:43:06 PM

That is an exellent ship, nice design & glle concept...

hmmm.... not really a big surprise from Guinness ;)

Jef