Iberia TB Designs of the 1920's

[miketr]

What are peoples thoughts?  This design assumes the double SS seakeeping.

DD-1920 (L), Iberia Destroyer Leader laid down 1920 (Engine 1916)

Displacement:
   2,001 t light; 2,079 t standard; 2,403 t normal; 2,662 t full load

Dimensions: Length overall / water x beam x draught
   344.49 ft / 344.49 ft x 34.45 ft x 13.12 ft (normal load)
   105.00 m / 105.00 m x 10.50 m  x 4.00 m

Armament:
      5 - 4.72" / 120 mm guns in single mounts, 52.72lbs / 23.92kg shells, 1920 Model
     Breech loading guns in deck mounts with hoists
     on centreline ends, majority forward, 3 raised mounts - superfiring
      2 - 1.57" / 40.0 mm guns in single mounts, 1.95lbs / 0.89kg shells, 1920 Model
     Anti-aircraft guns in deck mounts
     on side, all amidships, all raised mounts - superfiring
      4 - 0.49" / 12.5 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1920 Model
     Machine guns in deck mounts
     on side, evenly spread, all raised mounts
   Weight of broadside 268 lbs / 121 kg
   Shells per gun, main battery: 200
   8 - 21.0" / 533 mm above water torpedoes

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.97" / 50 mm         -               -
   2nd:   0.98" / 25 mm         -               -
   3rd:   0.39" / 10 mm         -               -

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 12 shafts, 50,458 shp / 37,642 Kw = 32.60 kts
   Range 5,370nm at 14.00 kts
   Bunker at max displacement = 583 tons

Complement:
   171 - 223

Cost:
   £0.703 million / $2.811 million

Distribution of weights at normal displacement:
   Armament: 33 tons, 1.4 %
   Armour: 27 tons, 1.1 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 27 tons, 1.1 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 1,422 tons, 59.2 %
   Hull, fittings & equipment: 462 tons, 19.2 %
   Fuel, ammunition & stores: 402 tons, 16.7 %
   Miscellaneous weights: 56 tons, 2.3 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     329 lbs / 149 Kg = 6.2 x 4.7 " / 120 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.01
   Metacentric height 1.0 ft / 0.3 m
   Roll period: 14.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.42
   Seaboat quality  (Average = 1.00): 0.50

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0.540
   Length to Beam Ratio: 10.00 : 1
   'Natural speed' for length: 18.56 kts
   Power going to wave formation at top speed: 71 %
   Trim (Max stability = 0, Max steadiness = 100): 100
   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:      13.45 ft / 4.10 m
      - Forecastle (20 %):   13.12 ft / 4.00 m
      - Mid (50 %):      12.80 ft / 3.90 m (11.15 ft / 3.40 m aft of break)
      - Quarterdeck (15 %):   10.83 ft / 3.30 m
      - Stern:      10.50 ft / 3.20 m
      - Average freeboard:   11.98 ft / 3.65 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 204.4 %
      - Above water (accommodation/working, high = better): 58.3 %
   Waterplane Area: 8,205 Square feet or 762 Square metres
   Displacement factor (Displacement / loading): 58 %
   Structure weight / hull surface area: 34 lbs/sq ft or 164 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 0.80
      - Overall: 0.53
   Hull space for machinery, storage, compartmentation is extremely poor
   Room for accommodation and workspaces is cramped
   Caution: Lacks seaworthiness - very limited seakeeping ability

Torpedoes Eight (3 ton each), 8 x 3 = 24 tons
DD FC 25 tons
Fifteen 1/3 ton Depth Charges 5 tons
2 tons construction reserve
Trial Speed 33.0

[maddox]

I do like the 12 shaft idea.

But is 32,5 kts not a tad slow for a 2kton DD?

[miketr]

Wierd error on the shafts.

I tried to avoid twinking out the design.  I am sure I could get another 0.5 knot if I pushed the L:B ratio up to 12 to 1 and pushed down the BC.

[Jefgte]

BC is high...
Seaboat quality is not "tip top"... ???

...You could probably SS a better DD


Jef  ;)

[Guinness]

I think Mike is trying to fiddle with ideas of lower freeboard, etc. resultant of the table I posted about OTL DDs a few days ago.

*THREADJACK*

Here's one idea for a similar ship. It's flush-decked, and it's probably a little bit early for that, but...

DD Concept, Ottoman Empire Destroyer laid down 1922 (Engine 1916)

Displacement:
   2,000 t light; 2,074 t standard; 2,372 t normal; 2,611 t full load

Dimensions: Length overall / water x beam x draught
   357.60 ft / 351.05 ft x 37.07 ft x 12.39 ft (normal load)
   109.00 m / 107.00 m x 11.30 m  x 3.78 m

Armament:
      5 - 4.72" / 120 mm guns in single mounts, 52.72lbs / 23.92kg shells, 1922 Model
     Breech loading guns in deck mounts
     on centreline, evenly spread, 3 raised mounts
      2 - 1.57" / 40.0 mm guns in single mounts, 1.95lbs / 0.89kg shells, 1922 Model
     Anti-aircraft guns in deck mounts
     on side, all amidships, all raised mounts - superfiring
      4 - 0.51" / 13.0 mm guns in single mounts, 0.07lbs / 0.03kg shells, 1922 Model
     Machine guns in deck mounts
     on side, evenly spread, all raised mounts
   Weight of broadside 268 lbs / 121 kg
   Shells per gun, main battery: 180
   6 - 21.0" / 533 mm above water torpedoes

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

   - Conning tower: 0.59" / 15 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 54,000 shp / 40,284 Kw = 33.29 kts
   Range 4,200nm at 15.00 kts
   Bunker at max displacement = 537 tons

Complement:
   169 - 220

Cost:
   £0.825 million / $3.301 million

Distribution of weights at normal displacement:
   Armament: 33 tons, 1.4 %
   Armour: 10 tons, 0.4 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 8 tons, 0.3 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 2 tons, 0.1 %
   Machinery: 1,461 tons, 61.6 %
   Hull, fittings & equipment: 434 tons, 18.3 %
   Fuel, ammunition & stores: 373 tons, 15.7 %
   Miscellaneous weights: 62 tons, 2.6 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     328 lbs / 149 Kg = 6.2 x 4.7 " / 120 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.29
   Metacentric height 1.8 ft / 0.5 m
   Roll period: 11.6 seconds
   Steadiness   - As gun platform (Average = 50 %): 51 %
         - Recoil effect (Restricted arc if above 1.00): 0.12
   Seaboat quality  (Average = 1.00): 0.51

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.515
   Length to Beam Ratio: 9.47 : 1
   'Natural speed' for length: 18.74 kts
   Power going to wave formation at top speed: 71 %
   Trim (Max stability = 0, Max steadiness = 100): 100
   Bow angle (Positive = bow angles forward): 14.70 degrees
   Stern overhang: 1.64 ft / 0.50 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      18.70 ft / 5.70 m
      - Forecastle (17 %):   16.08 ft / 4.90 m
      - Mid (55 %):      8.86 ft / 2.70 m
      - Quarterdeck (13 %):   8.20 ft / 2.50 m
      - Stern:      8.86 ft / 2.70 m
      - Average freeboard:   11.49 ft / 3.50 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 212.2 %
      - Above water (accommodation/working, high = better): 72.2 %
   Waterplane Area: 8,791 Square feet or 817 Square metres
   Displacement factor (Displacement / loading): 54 %
   Structure weight / hull surface area: 31 lbs/sq ft or 153 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 0.71
      - Overall: 0.51
   Hull space for machinery, storage, compartmentation is extremely poor
   Room for accommodation and workspaces is cramped
   Caution: Lacks seaworthiness - very limited seakeeping ability

Misc Weights (standard):
12t: 4 21" Torpedoes
25t: Fire control
1t: Depth Charges(4)
10t: Minesweeping Gear
6t: Mines
8t: Misc equipment and reserve

Misc Weights as minelayer:
4t: 2 21" Torpedoes
25t: Fire control
29t: 29 Mines

Range at Top Speed: 405nm, or 12.17 hours
Trialspeed: 34 knots

And a couple of later engined designs:

DD Concept, Ottoman Empire Destroyer laid down 1922

Displacement:
   2,000 t light; 2,074 t standard; 2,346 t normal; 2,563 t full load

Dimensions: Length overall / water x beam x draught
   354.34 ft / 347.77 ft x 37.07 ft x 12.39 ft (normal load)
   108.00 m / 106.00 m x 11.30 m  x 3.78 m

Armament:
      5 - 4.72" / 120 mm guns (3 mounts), 52.72lbs / 23.91kg shells, 1922 Model
     Breech loading guns in deck mounts
     on centreline, evenly spread, 3 raised mounts
     Aft Main mounts separated by engine room
      2 - 1.57" / 40.0 mm guns in single mounts, 1.95lbs / 0.88kg shells, 1922 Model
     Anti-aircraft guns in deck mounts
     on side, all amidships, all raised mounts - superfiring
      4 - 0.51" / 13.0 mm guns in single mounts, 0.07lbs / 0.03kg shells, 1922 Model
     Machine guns in deck mounts
     on side, evenly spread, all raised mounts
   Weight of broadside 268 lbs / 121 kg
   Shells per gun, main battery: 180
   6 - 21.0" / 533 mm above water torpedoes

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

   - Conning tower: 0.59" / 15 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 58,500 shp / 43,641 Kw = 33.90 kts
   Range 4,520nm at 15.00 kts
   Bunker at max displacement = 488 tons

Complement:
   168 - 219

Cost:
   £0.816 million / $3.265 million

Distribution of weights at normal displacement:
   Armament: 33 tons, 1.4 %
   Armour: 10 tons, 0.4 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 8 tons, 0.3 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 2 tons, 0.1 %
   Machinery: 1,437 tons, 61.3 %
   Hull, fittings & equipment: 458 tons, 19.5 %
   Fuel, ammunition & stores: 345 tons, 14.7 %
   Miscellaneous weights: 62 tons, 2.6 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     344 lbs / 156 Kg = 6.5 x 4.7 " / 120 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.26
   Metacentric height 1.7 ft / 0.5 m
   Roll period: 11.9 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.14
   Seaboat quality  (Average = 1.00): 0.50

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.514
   Length to Beam Ratio: 9.38 : 1
   'Natural speed' for length: 18.65 kts
   Power going to wave formation at top speed: 72 %
   Trim (Max stability = 0, Max steadiness = 100): 100
   Bow angle (Positive = bow angles forward): 14.30 degrees
   Stern overhang: 1.64 ft / 0.50 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      19.36 ft / 5.90 m
      - Forecastle (17 %):   17.06 ft / 5.20 m
      - Mid (59 %):      9.51 ft / 2.90 m
      - Quarterdeck (13 %):   8.69 ft / 2.65 m
      - Stern:      9.51 ft / 2.90 m
      - Average freeboard:   12.35 ft / 3.76 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 211.4 %
      - Above water (accommodation/working, high = better): 77.7 %
   Waterplane Area: 8,701 Square feet or 808 Square metres
   Displacement factor (Displacement / loading): 54 %
   Structure weight / hull surface area: 33 lbs/sq ft or 160 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 0.80
      - Overall: 0.52
   Hull space for machinery, storage, compartmentation is extremely poor
   Room for accommodation and workspaces is cramped
   Caution: Lacks seaworthiness - very limited seakeeping ability

Misc Weights (standard):
12t: 4 21" Torpedoes
25t: Fire control
1t: Depth Charges(4)
10t: Minesweeping Gear
6t: Mines
8t: Misc equipment and reserve

Misc Weights as minelayer:
4t: 2 21" Torpedoes
25t: Fire control
29t: 29 Mines

Range at Top Speed: 407nm, or 12hours
Trialspeed: 34.5 knots

DD Concept Raised Forecastle, Ottoman Empire Destroyer laid down 1922

Displacement:
   2,000 t light; 2,074 t standard; 2,346 t normal; 2,563 t full load

Dimensions: Length overall / water x beam x draught
   354.33 ft / 347.77 ft x 37.07 ft x 12.39 ft (normal load)
   108.00 m / 106.00 m x 11.30 m  x 3.78 m

Armament:
      5 - 4.72" / 120 mm guns (3 mounts), 52.72lbs / 23.91kg shells, 1922 Model
     Breech loading guns in deck mounts
     on centreline, evenly spread, 3 raised mounts
     Aft Main mounts separated by engine room
      2 - 1.57" / 40.0 mm guns in single mounts, 1.95lbs / 0.88kg shells, 1922 Model
     Anti-aircraft guns in deck mounts
     on side, all amidships, all raised mounts - superfiring
      4 - 0.51" / 13.0 mm guns in single mounts, 0.07lbs / 0.03kg shells, 1922 Model
     Machine guns in deck mounts
     on side, evenly spread, all raised mounts
   Weight of broadside 268 lbs / 121 kg
   Shells per gun, main battery: 180
   6 - 21.0" / 533 mm above water torpedoes

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

   - Conning tower: 0.59" / 15 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 58,000 shp / 43,268 Kw = 33.83 kts
   Range 4,520nm at 15.00 kts
   Bunker at max displacement = 488 tons

Complement:
   168 - 219

Cost:
   £0.814 million / $3.256 million

Distribution of weights at normal displacement:
   Armament: 33 tons, 1.4 %
   Armour: 10 tons, 0.4 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 8 tons, 0.3 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 2 tons, 0.1 %
   Machinery: 1,431 tons, 61.0 %
   Hull, fittings & equipment: 464 tons, 19.8 %
   Fuel, ammunition & stores: 345 tons, 14.7 %
   Miscellaneous weights: 62 tons, 2.6 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     351 lbs / 159 Kg = 6.7 x 4.7 " / 120 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.25
   Metacentric height 1.7 ft / 0.5 m
   Roll period: 11.9 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.14
   Seaboat quality  (Average = 1.00): 0.50

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0.514
   Length to Beam Ratio: 9.38 : 1
   'Natural speed' for length: 18.65 kts
   Power going to wave formation at top speed: 72 %
   Trim (Max stability = 0, Max steadiness = 100): 100
   Bow angle (Positive = bow angles forward): 14.50 degrees
   Stern overhang: 1.64 ft / 0.50 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      19.03 ft / 5.80 m
      - Forecastle (17 %):   17.55 ft / 5.35 m
      - Mid (38 %):      16.73 ft / 5.10 m (9.19 ft / 2.80 m aft of break)
      - Quarterdeck (13 %):   9.19 ft / 2.80 m
      - Stern:      9.19 ft / 2.80 m
      - Average freeboard:   12.34 ft / 3.76 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 210.5 %
      - Above water (accommodation/working, high = better): 77.2 %
   Waterplane Area: 8,701 Square feet or 808 Square metres
   Displacement factor (Displacement / loading): 55 %
   Structure weight / hull surface area: 33 lbs/sq ft or 163 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.51
      - Longitudinal: 0.81
      - Overall: 0.53
   Hull space for machinery, storage, compartmentation is extremely poor
   Room for accommodation and workspaces is cramped
   Caution: Lacks seaworthiness - very limited seakeeping ability

Misc Weights (standard):
12t: 4 21" Torpedoes
25t: Fire control
1t: Depth Charges(4)
10t: Minesweeping Gear
6t: Mines
8t: Misc equipment and reserve

Misc Weights as minelayer:
4t: 2 21" Torpedoes
25t: Fire control
29t: 29 Mines

Range at Top Speed: 407nm, or 12hours
Trialspeed: 34.5 knots

Why the threadjack? Just to point out that some more speed is possible. I think one thing Mike may be facing here though is the classic endurance/speed trade off.

[miketr]

I think Mike is trying to fiddle with ideas of lower freeboard, etc. resultant of the table I posted about OTL DDs a few days ago.

Yes

Why the threadjack? Just to point out that some more speed is possible. I think one thing Mike may be facing here though is the classic endurance/speed trade off.

Yes in part and also my design has mount and hoist for the guns, if I remove that I can get another half knot of speed on the base design.

[Guinness]

I missed that.... The next question to dive in and research is: do you really need mount and hoist. 120mm rounds, especially if fixed, are probably heavy enough to justify it. The Brits, I believe (need to research to make sure), adopted dredger hoists on the V&Ws mostly because they were worried about lifting shells all the way to B mount from the forward magazine.

So more on that probably in the next few days: 3 day weekend coming up :)

[miketr]

I updated my small TB design.  I am much happier with this result.

TB-1918-Small, Iberia Torpedo Boat laid down 1917 (Engine 1916)

Displacement:
   248 t light; 257 t standard; 282 t normal; 303 t full load

Dimensions: Length overall / water x beam x draught
   223.10 ft / 223.10 ft x 18.70 ft x 5.91 ft (normal load)
   68.00 m / 68.00 m x 5.70 m  x 1.80 m

Armament:
      1 - 4.13" / 105 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1917 Model
     Quick firing gun in deck mount
     on centreline forward
      2 - 0.49" / 12.5 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1917 Model
     Machine guns in deck mounts
     on side, all amidships, all raised mounts - superfiring
   Weight of broadside 35 lbs / 16 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:   0.98" / 25 mm         -               -

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 8,929 shp / 6,661 Kw = 29.00 kts
   Range 3,200nm at 10.00 kts
   Bunker at max displacement = 46 tons

Complement:
   33 - 44

Cost:
   £0.060 million / $0.238 million

Distribution of weights at normal displacement:
   Armament: 4 tons, 1.6 %
   Armour: 2 tons, 0.8 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 2 tons, 0.8 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 145 tons, 51.4 %
   Hull, fittings & equipment: 75 tons, 26.7 %
   Fuel, ammunition & stores: 34 tons, 12.1 %
   Miscellaneous weights: 21 tons, 7.4 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     59 lbs / 27 Kg = 1.7 x 4.1 " / 105 mm shells or 0.1 torpedoes
   Stability (Unstable if below 1.00): 1.10
   Metacentric height 0.5 ft / 0.1 m
   Roll period: 11.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 45 %
         - Recoil effect (Restricted arc if above 1.00): 0.15
   Seaboat quality  (Average = 1.00): 0.50

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0.401
   Length to Beam Ratio: 11.93 : 1
   'Natural speed' for length: 14.94 kts
   Power going to wave formation at top speed: 67 %
   Trim (Max stability = 0, Max steadiness = 100): 81
   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:      10.17 ft / 3.10 m
      - Forecastle (20 %):   9.02 ft / 2.75 m
      - Mid (50 %):      7.87 ft / 2.40 m (4.59 ft / 1.40 m aft of break)
      - Quarterdeck (15 %):   4.59 ft / 1.40 m
      - Stern:      4.59 ft / 1.40 m
      - Average freeboard:   6.73 ft / 2.05 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 186.0 %
      - Above water (accommodation/working, high = better): 47.7 %
   Waterplane Area: 2,570 Square feet or 239 Square metres
   Displacement factor (Displacement / loading): 39 %
   Structure weight / hull surface area: 17 lbs/sq ft or 85 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 0.76
      - Overall: 0.52
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is extremely poor
   Caution: Lacks seaworthiness - very limited seakeeping ability

Three 21" 2 ton torpedo's 6 tons
Light Radio 10 tons
Fifteen 1/3 ton Depth Charges 5 tons
Trial Speed 33.32 knots
Range 2,100 nm @ 12 knots
Range 550 nm @ 20 knots
Range 180 nm @ 29 knots

[Guinness]

You shouldn't need a Misc weight allocation for a short-ranged wireless anymore.

The depth charges are interesting. What theater are you thinking of using these in? Their legs are probably too short for any sort of convoy escort duty, but I suppose if you have a coast you are worried about finding subs near, the DCs could be valuable.

[miketr]

The small TB's are pure coast defense craft for places with tight waters like the Philippines, Straits of Gibraltar, Med in General and Caribbean.  Not for deep ocean work.  Within those waters I would like them to have depth charges.

I keep forgetting on the wireless sets.

[Guinness]

Hmm, in shallow waters such as those, ramming a sub may be a viable tactic too. You might want to reallocate some of that radio weight to a reinforced bow (with those little cleats on the front like you see sometimes in illustrations).

[miketr]

Ramming got a suprising number of subs in WW1, I think it was a quarter of all ships.

[Jefgte]

Nearly the max 70m CTB.

Good ship.

Perhaps...Could you have better seaboat ?


Jef  ;)

[miketr]

This is after I gutted the seakeeping as Guinness suggested.

[Jefgte]

Guinness had interrest that you built rotten ship... not me

:D  :D  :D


Jef  ;)