Iberian Small Craft 1917

[miketr]

There are 3 designs here.  1,500 ton TBD Leader, a 1,000 ton destroyer and a 250 ton coast defense destroyer.  I will work on some patrol boats and perhaps some type of mine hunter design.

TBD-1917, Iberia Torpedo Boat Destroyer (L) laid down 1917 (Engine 1916)

Displacement:
   1,501 t light; 1,557 t standard; 1,744 t normal; 1,892 t full load

Dimensions: Length overall / water x beam x draught
   393.70 ft / 393.70 ft x 32.81 ft x 11.81 ft (normal load)
   120.00 m / 120.00 m x 10.00 m  x 3.60 m

Armament:
      4 - 4.13" / 105 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1917 Model
     Breech loading guns in deck mounts with hoists
     on centreline ends, evenly spread, 2 raised mounts - superfiring
      2 - 1.97" / 50.0 mm guns in single mounts, 3.81lbs / 1.73kg shells, 1917 Model
     Quick firing guns in deck mounts
     on side, all amidships
      4 - 0.49" / 12.5 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1917 Model
     Breech loading guns in deck mounts
     on side, evenly spread
   Weight of broadside 149 lbs / 68 kg
   Shells per gun, main battery: 250
   9 - 20.0" / 508 mm above water torpedoes

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

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 35,849 shp / 26,743 Kw = 33.00 kts
   Range 7,600nm at 10.00 kts
   Bunker at max displacement = 335 tons

Complement:
   134 - 175

Cost:
   £0.368 million / $1.472 million

Distribution of weights at normal displacement:
   Armament: 19 tons, 1.1 %
   Armour: 11 tons, 0.6 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 11 tons, 0.6 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 959 tons, 55.0 %
   Hull, fittings & equipment: 445 tons, 25.5 %
   Fuel, ammunition & stores: 242 tons, 13.9 %
   Miscellaneous weights: 68 tons, 3.9 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     376 lbs / 171 Kg = 10.7 x 4.1 " / 105 mm shells or 0.3 torpedoes
   Stability (Unstable if below 1.00): 1.29
   Metacentric height 1.5 ft / 0.5 m
   Roll period: 11.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.27
   Seaboat quality  (Average = 1.00): 1.00

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0.400
   Length to Beam Ratio: 12.00 : 1
   'Natural speed' for length: 19.84 kts
   Power going to wave formation at top speed: 61 %
   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:      14.44 ft / 4.40 m
      - Forecastle (20 %):   13.78 ft / 4.20 m
      - Mid (50 %):      13.12 ft / 4.00 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:   12.59 ft / 3.84 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 190.4 %
      - Above water (accommodation/working, high = better): 79.1 %
   Waterplane Area: 7,951 Square feet or 739 Square metres
   Displacement factor (Displacement / loading): 60 %
   Structure weight / hull surface area: 31 lbs/sq ft or 150 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 0.90
      - Overall: 0.53
   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

Short range radio 10 tons,
DD FC 25 tons,
nine 21" 2 ton torpedos (3x3) 18 tons
Fifteen 1/3 ton Depth Charges 5 tons
10 tons construction reserve
Trial Speed: 33.64

TBD-1917, Iberia Torpedo Boat Destroyer laid down 1917 (Engine 1916)

Displacement:
   1,000 t light; 1,037 t standard; 1,183 t normal; 1,300 t full load

Dimensions: Length overall / water x beam x draught
   393.70 ft / 393.70 ft x 32.81 ft x 8.02 ft (normal load)
   120.00 m / 120.00 m x 10.00 m  x 2.44 m

Armament:
      3 - 4.13" / 105 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1917 Model
     Breech loading guns in deck mounts
     on centreline ends, majority forward, 1 raised mount
      2 - 1.97" / 50.0 mm guns in single mounts, 3.81lbs / 1.73kg shells, 1917 Model
     Breech loading guns in deck mounts
     on side, all amidships
      4 - 0.49" / 12.5 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1917 Model
     Breech loading guns in deck mounts
     on side, evenly spread, all raised mounts
   Weight of broadside 114 lbs / 52 kg
   Shells per gun, main battery: 200
   6 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.98" / 25 mm         -               -
   2nd:   0.98" / 25 mm         -               -

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 22,524 shp / 16,803 Kw = 31.25 kts
   Range 7,500nm at 10.00 kts
   Bunker at max displacement = 264 tons

Complement:
   100 - 131

Cost:
   £0.237 million / $0.948 million

Distribution of weights at normal displacement:
   Armament: 14 tons, 1.2 %
   Armour: 8 tons, 0.7 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 8 tons, 0.7 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 596 tons, 50.4 %
   Hull, fittings & equipment: 329 tons, 27.8 %
   Fuel, ammunition & stores: 183 tons, 15.5 %
   Miscellaneous weights: 52 tons, 4.4 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     369 lbs / 168 Kg = 10.5 x 4.1 " / 105 mm shells or 0.3 torpedoes
   Stability (Unstable if below 1.00): 1.44
   Metacentric height 1.8 ft / 0.5 m
   Roll period: 10.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.10
   Seaboat quality  (Average = 1.00): 1.00

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.400
   Length to Beam Ratio: 12.00 : 1
   'Natural speed' for length: 19.84 kts
   Power going to wave formation at top speed: 57 %
   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:      13.12 ft / 4.00 m
      - Forecastle (20 %):   12.14 ft / 3.70 m
      - Mid (50 %):      11.15 ft / 3.40 m
      - Quarterdeck (15 %):   11.15 ft / 3.40 m
      - Stern:      11.15 ft / 3.40 m
      - Average freeboard:   11.58 ft / 3.53 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 176.9 %
      - Above water (accommodation/working, high = better): 117.2 %
   Waterplane Area: 7,951 Square feet or 739 Square metres
   Displacement factor (Displacement / loading): 64 %
   Structure weight / hull surface area: 26 lbs/sq ft or 128 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 0.62
      - Overall: 0.51
   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

Short range radio 10 tons
Six 21" torpedos (2x3) 12 tons
DD FC 25 tons
Fifteen 1/3 ton Depth Charges 5 tons
Trial Speed: 32.19

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

Displacement:
   250 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 - 2.95" / 75.0 mm guns in single mounts, 12.87lbs / 5.84kg 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
     Quick firing guns in deck mounts
     on centreline, all aft, all raised mounts - superfiring
   Weight of broadside 13 lbs / 6 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, 6,590 shp / 4,916 Kw = 27.00 kts
   Range 3,200nm at 10.00 kts
   Bunker at max displacement = 46 tons

Complement:
   33 - 44

Cost:
   £0.055 million / $0.218 million

Distribution of weights at normal displacement:
   Armament: 2 tons, 0.6 %
   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: 142 tons, 50.3 %
   Hull, fittings & equipment: 84 tons, 29.8 %
   Fuel, ammunition & stores: 32 tons, 11.4 %
   Miscellaneous weights: 21 tons, 7.4 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     88 lbs / 40 Kg = 6.9 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): 0.06
   Seaboat quality  (Average = 1.00): 1.00

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: 64 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   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:      11.81 ft / 3.60 m
      - Forecastle (20 %):   10.66 ft / 3.25 m
      - Mid (50 %):      9.51 ft / 2.90 m (5.91 ft / 1.80 m aft of break)
      - Quarterdeck (15 %):   5.91 ft / 1.80 m
      - Stern:      5.91 ft / 1.80 m
      - Average freeboard:   8.20 ft / 2.50 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 174.7 %
      - Above water (accommodation/working, high = better): 58.6 %
   Waterplane Area: 2,570 Square feet or 239 Square metres
   Displacement factor (Displacement / loading): 54 %
   Structure weight / hull surface area: 17 lbs/sq ft or 81 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.40
      - Overall: 0.55
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is cramped

Three 21" 2 ton torpedo's 6 tons
Light Radio 10 tons
Fifteen 1/3 ton Depth Charges 5 tons
Trial Speed 31.19 Knots

[miketr]

A Sub hunting design.  Not sure how many if any I might build but its what I came up with.

Michael

C-1917, Iberia Corvette laid down 1917 (Engine 1916)

Displacement:
   751 t light; 773 t standard; 927 t normal; 1,051 t full load

Dimensions: Length overall / water x beam x draught
   199.80 ft / 196.85 ft x 32.81 ft x 10.93 ft (normal load)
   60.90 m / 60.00 m x 10.00 m  x 3.33 m

Armament:
      2 - 2.95" / 75.0 mm guns in one mount, 12.87lbs / 5.84kg shells, 1917 Model
     Breech loading guns in deck mount
     on centreline forward, 1 raised gun
      4 - 0.49" / 12.5 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1917 Model
     Machine guns in deck mounts
     on side, evenly spread, all raised mounts
   Weight of broadside 26 lbs / 12 kg
   Shells per gun, main battery: 200
   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         -               -
   3rd:   0.39" / 10 mm         -               -

   - Conning tower: 1.97" / 50 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 8,105 shp / 6,046 Kw = 22.50 kts
   Range 10,050nm at 10.00 kts
   Bunker at max displacement = 278 tons

Complement:
   83 - 109

Cost:
   £0.130 million / $0.519 million

Distribution of weights at normal displacement:
   Armament: 3 tons, 0.4 %
   Armour: 7 tons, 0.7 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 3 tons, 0.3 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 4 tons, 0.4 %
   Machinery: 302 tons, 32.6 %
   Hull, fittings & equipment: 333 tons, 36.0 %
   Fuel, ammunition & stores: 176 tons, 19.0 %
   Miscellaneous weights: 106 tons, 11.4 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     944 lbs / 428 Kg = 73.4 x 3.0 " / 75 mm shells or 0.5 torpedoes
   Stability (Unstable if below 1.00): 1.20
   Metacentric height 1.3 ft / 0.4 m
   Roll period: 12.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 56 %
         - Recoil effect (Restricted arc if above 1.00): 0.03
   Seaboat quality  (Average = 1.00): 1.14

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0.460
   Length to Beam Ratio: 6.00 : 1
   'Natural speed' for length: 14.03 kts
   Power going to wave formation at top speed: 70 %
   Trim (Max stability = 0, Max steadiness = 100): 49
   Bow angle (Positive = bow angles forward): 10.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      16.73 ft / 5.10 m
      - Forecastle (20 %):   15.75 ft / 4.80 m
      - Mid (50 %):      15.09 ft / 4.60 m (11.81 ft / 3.60 m aft of break)
      - Quarterdeck (15 %):   11.81 ft / 3.60 m
      - Stern:      11.81 ft / 3.60 m
      - Average freeboard:   13.76 ft / 4.19 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 120.9 %
      - Above water (accommodation/working, high = better): 87.4 %
   Waterplane Area: 4,154 Square feet or 386 Square metres
   Displacement factor (Displacement / loading): 125 %
   Structure weight / hull surface area: 42 lbs/sq ft or 207 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.81
      - Longitudinal: 6.27
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is cramped

25 tons DD FC
25 tons Long Range Radio
10 tons for thirty 1/3 ton Depth Charges
6 tons for three 2 ton 21" torpedos
40 tons construction reserve

[The Rock Doctor]

It looks like it'd be a useful as a convoy escort, but is DD FC a useful investment for two 75mm guns?

[maddox]

I dare to say that FC's a waste of resources.

Unless nefarious future plans are brewing in the fertile mind of Miketr.

[miketr]

Max firepower I can fit on the hull without additional changes.

C-1917b, Iberia Corvette laid down 1917 (Engine 1916)

Displacement:
   751 t light; 781 t standard; 927 t normal; 1,044 t full load

Dimensions: Length overall / water x beam x draught
   199.80 ft / 196.85 ft x 32.81 ft x 10.93 ft (normal load)
   60.90 m / 60.00 m x 10.00 m  x 3.33 m

Armament:
      2 - 4.72" / 120 mm guns in single mounts, 52.72lbs / 23.92kg shells, 1917 Model
     Breech loading guns in deck mounts
     on centreline ends, evenly spread, 1 raised mount
      4 - 0.49" / 12.5 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1917 Model
     Machine guns in deck mounts
     on side, evenly spread, all raised mounts
   Weight of broadside 106 lbs / 48 kg
   Shells per gun, main battery: 200
   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         -               -
   3rd:   0.39" / 10 mm         -               -

   - Conning tower: 1.97" / 50 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 8,105 shp / 6,046 Kw = 22.50 kts
   Range 9,500nm at 10.00 kts
   Bunker at max displacement = 263 tons

Complement:
   83 - 109

Cost:
   £0.145 million / $0.579 million

Distribution of weights at normal displacement:
   Armament: 13 tons, 1.4 %
   Armour: 9 tons, 1.0 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 5 tons, 0.6 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 4 tons, 0.4 %
   Machinery: 302 tons, 32.6 %
   Hull, fittings & equipment: 347 tons, 37.4 %
   Fuel, ammunition & stores: 177 tons, 19.0 %
   Miscellaneous weights: 79 tons, 8.5 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     878 lbs / 398 Kg = 16.6 x 4.7 " / 120 mm shells or 0.4 torpedoes
   Stability (Unstable if below 1.00): 1.23
   Metacentric height 1.4 ft / 0.4 m
   Roll period: 11.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 56 %
         - Recoil effect (Restricted arc if above 1.00): 0.13
   Seaboat quality  (Average = 1.00): 1.14

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0.460
   Length to Beam Ratio: 6.00 : 1
   'Natural speed' for length: 14.03 kts
   Power going to wave formation at top speed: 70 %
   Trim (Max stability = 0, Max steadiness = 100): 49
   Bow angle (Positive = bow angles forward): 10.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      16.73 ft / 5.10 m
      - Forecastle (20 %):   15.75 ft / 4.80 m
      - Mid (50 %):      15.09 ft / 4.60 m (11.81 ft / 3.60 m aft of break)
      - Quarterdeck (15 %):   11.81 ft / 3.60 m
      - Stern:      11.81 ft / 3.60 m
      - Average freeboard:   13.76 ft / 4.19 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 126.2 %
      - Above water (accommodation/working, high = better): 87.4 %
   Waterplane Area: 4,154 Square feet or 386 Square metres
   Displacement factor (Displacement / loading): 116 %
   Structure weight / hull surface area: 44 lbs/sq ft or 216 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.81
      - Longitudinal: 6.50
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is cramped

25 tons DD FC
25 tons Long Range Radio
10 tons for thirty 1/3 ton Depth Charges
6 tons for three 2 ton 21" torpedos
13 tons construction reserve

[maddox]

Why not more  105's or 75's?  Then FC could come in handy, with only main 2 guns it's not ideal.

[miketr]

OK same weapon setup as a 1,000 ton DD.

Michael

C-1917c, Iberia Corvette laid down 1917 (Engine 1916)

Displacement:
   751 t light; 781 t standard; 927 t normal; 1,044 t full load

Dimensions: Length overall / water x beam x draught
   199.80 ft / 196.85 ft x 32.81 ft x 10.93 ft (normal load)
   60.90 m / 60.00 m x 10.00 m  x 3.33 m

Armament:
      3 - 4.13" / 105 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1917 Model
     Breech loading guns in deck mounts
     on centreline ends, majority forward, 2 raised mounts - superfiring
      4 - 0.49" / 12.5 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1917 Model
     Machine guns in deck mounts
     on side, evenly spread, all raised mounts
   Weight of broadside 106 lbs / 48 kg
   Shells per gun, main battery: 200
   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         -               -
   3rd:   0.39" / 10 mm         -               -

   - Conning tower: 1.97" / 50 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 8,105 shp / 6,046 Kw = 22.50 kts
   Range 9,500nm at 10.00 kts
   Bunker at max displacement = 263 tons

Complement:
   83 - 109

Cost:
   £0.145 million / $0.580 million

Distribution of weights at normal displacement:
   Armament: 13 tons, 1.4 %
   Armour: 11 tons, 1.2 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 7 tons, 0.7 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 4 tons, 0.4 %
   Machinery: 302 tons, 32.6 %
   Hull, fittings & equipment: 349 tons, 37.6 %
   Fuel, ammunition & stores: 177 tons, 19.1 %
   Miscellaneous weights: 76 tons, 8.2 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     882 lbs / 400 Kg = 25.0 x 4.1 " / 105 mm shells or 0.4 torpedoes
   Stability (Unstable if below 1.00): 1.23
   Metacentric height 1.4 ft / 0.4 m
   Roll period: 11.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 56 %
         - Recoil effect (Restricted arc if above 1.00): 0.13
   Seaboat quality  (Average = 1.00): 1.13

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0.460
   Length to Beam Ratio: 6.00 : 1
   'Natural speed' for length: 14.03 kts
   Power going to wave formation at top speed: 70 %
   Trim (Max stability = 0, Max steadiness = 100): 49
   Bow angle (Positive = bow angles forward): 10.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      16.73 ft / 5.10 m
      - Forecastle (20 %):   15.75 ft / 4.80 m
      - Mid (50 %):      15.09 ft / 4.60 m (11.81 ft / 3.60 m aft of break)
      - Quarterdeck (15 %):   11.81 ft / 3.60 m
      - Stern:      11.81 ft / 3.60 m
      - Average freeboard:   13.76 ft / 4.19 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 125.9 %
      - Above water (accommodation/working, high = better): 87.4 %
   Waterplane Area: 4,154 Square feet or 386 Square metres
   Displacement factor (Displacement / loading): 116 %
   Structure weight / hull surface area: 44 lbs/sq ft or 217 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.81
      - Longitudinal: 6.50
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is cramped

25 tons DD FC
25 tons Long Range Radio
10 tons for thirty 1/3 ton Depth Charges
6 tons for three 2 ton 21" torpedos
10 tons construction reserve

[miketr]

I decided to up gun the destroyer designs a little...

TBD-1917a, Iberia Torpedo Boat Destroyer (L) laid down 1917 (Engine 1916)

Displacement:
   1,500 t light; 1,571 t standard; 1,744 t normal; 1,881 t full load

Dimensions: Length overall / water x beam x draught
   393.70 ft / 393.70 ft x 32.81 ft x 11.81 ft (normal load)
   120.00 m / 120.00 m x 10.00 m  x 3.60 m

Armament:
      5 - 4.72" / 120 mm guns in single mounts, 52.72lbs / 23.91kg shells, 1917 Model
     Breech loading guns in deck mounts with hoists
     on centreline, evenly spread, 3 raised mounts
      4 - 0.49" / 12.5 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1917 Model
     Breech loading guns in deck mounts
     on side, evenly spread
   Weight of broadside 264 lbs / 120 kg
   Shells per gun, main battery: 250
   9 - 21.0" / 533.4 mm above water torpedoes

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

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 33,653 shp / 25,105 Kw = 32.50 kts
   Range 7,000nm at 10.00 kts
   Bunker at max displacement = 310 tons

Complement:
   134 - 175

Cost:
   £0.377 million / $1.510 million

Distribution of weights at normal displacement:
   Armament: 33 tons, 1.9 %
   Armour: 13 tons, 0.8 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 13 tons, 0.8 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 910 tons, 52.2 %
   Hull, fittings & equipment: 476 tons, 27.3 %
   Fuel, ammunition & stores: 244 tons, 14.0 %
   Miscellaneous weights: 68 tons, 3.9 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     375 lbs / 170 Kg = 7.1 x 4.7 " / 120 mm shells or 0.3 torpedoes
   Stability (Unstable if below 1.00): 1.19
   Metacentric height 1.3 ft / 0.4 m
   Roll period: 12.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.55
   Seaboat quality  (Average = 1.00): 1.00

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0.400
   Length to Beam Ratio: 12.00 : 1
   'Natural speed' for length: 19.84 kts
   Power going to wave formation at top speed: 60 %
   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:      14.93 ft / 4.55 m
      - Forecastle (20 %):   13.78 ft / 4.20 m
      - Mid (50 %):      13.12 ft / 4.00 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:   12.62 ft / 3.85 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 187.9 %
      - Above water (accommodation/working, high = better): 72.8 %
   Waterplane Area: 7,951 Square feet or 739 Square metres
   Displacement factor (Displacement / loading): 61 %
   Structure weight / hull surface area: 33 lbs/sq ft or 160 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 0.92
      - Overall: 0.53
   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

Short range radio 10 tons,
DD FC 25 tons,
nine 21" 2 ton torpedos (3x3) 18 tons
Fifteen 1/3 ton Depth Charges 5 tons
20 tons construction reserve
Trial Speed: 33.15

TBD-1917-1000a, Iberia Torpedo Boat Destroyer laid down 1917 (Engine 1916)

Displacement:
   999 t light; 1,039 t standard; 1,183 t normal; 1,299 t full load

Dimensions: Length overall / water x beam x draught
   393.70 ft / 393.70 ft x 32.81 ft x 8.02 ft (normal load)
   120.00 m / 120.00 m x 10.00 m  x 2.44 m

Armament:
     4 - 4.13" / 105 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1917 Model
     Breech loading guns in deck mounts
     on centreline ends, evenly spread, 2 raised mounts - superfiring
     4 - 0.49" / 12.5 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1917 Model
     Breech loading guns in deck mounts
     on side, evenly spread, all raised mounts
   Weight of broadside 142 lbs / 64 kg
   Shells per gun, main battery: 200
   6 - 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,
   Geared drive, 2 shafts, 22,524 shp / 16,803 Kw = 31.25 kts
   Range 7,400nm at 10.00 kts
   Bunker at max displacement = 260 tons

Complement:
   100 - 131

Cost:
   £0.241 million / $0.962 million

Distribution of weights at normal displacement:
   Armament: 18 tons, 1.5 %
   Armour: 9 tons, 0.7 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 9 tons, 0.7 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 589 tons, 49.8 %
   Hull, fittings & equipment: 332 tons, 28.0 %
   Fuel, ammunition & stores: 184 tons, 15.5 %
   Miscellaneous weights: 52 tons, 4.4 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     364 lbs / 165 Kg = 10.3 x 4.1 " / 105 mm shells or 0.3 torpedoes
   Stability (Unstable if below 1.00): 1.43
   Metacentric height 1.7 ft / 0.5 m
   Roll period: 10.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.13
   Seaboat quality  (Average = 1.00): 1.00

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.400
   Length to Beam Ratio: 12.00 : 1
   'Natural speed' for length: 19.84 kts
   Power going to wave formation at top speed: 57 %
   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:      13.12 ft / 4.00 m
      - Forecastle (20 %):   12.14 ft / 3.70 m
      - Mid (50 %):      11.15 ft / 3.40 m
      - Quarterdeck (15 %):   11.15 ft / 3.40 m
      - Stern:      11.15 ft / 3.40 m
      - Average freeboard:   11.58 ft / 3.53 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 177.3 %
      - Above water (accommodation/working, high = better): 117.2 %
   Waterplane Area: 7,951 Square feet or 739 Square metres
   Displacement factor (Displacement / loading): 63 %
   Structure weight / hull surface area: 26 lbs/sq ft or 129 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 0.62
      - Overall: 0.51
   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

Short range radio 10 tons
Six 21" torpedos (2x3) 12 tons
DD FC 25 tons
Fifteen 1/3 ton Depth Charges 5 tons
Trial Speed: 32.19

[Guinness]

Check your torpedo diams in the SS itself. The 1500 tonner says it's carrying 20" torps, not 21" as specified in your Misc weight list. This doesn't matter much, but will matter a little for stability and space calculations.

[miketr]

fixed...

[Korpen]

What sort of range do the ships have at top speed?

[miketr]

TBD-1500 (L)
Range 4,800 nm @ 12 knots
Range 1,500 nm @ 20 knots
Range 375 nm @ 32.5 knots

TBD-1000
Range 5,000 nm @ 12 knots
Range 1,600 nm @ 20 knots
Range 440 nm @ 31.25 knots

TB-250
Range 2,100 nm @ 12 knots
Range 550 nm @ 20 knots
Range 220 nm @ 27 knots