Small Orange ships and MWVs

[P3D]

A TB design, intended for harbor defense and for the Rift sea. In calm waters should be able to make almost 34kts.
10t misc weight is 8x2t torpedoes and 6 depth charges.

Orange TB laid down 1916

Displacement:
   280 t light; 290 t standard; 336 t normal; 373 t full load

Dimensions: Length overall / water x beam x draught
   220.00 ft / 220.00 ft x 18.00 ft x 7.00 ft (normal load)
   67.06 m / 67.06 m x 5.49 m  x 2.13 m

Armament:
      2 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1912 Model
     Quick firing guns in deck mounts
     on centreline, evenly spread
      2 - 0.40" / 10.2 mm guns in single mounts, 0.03lbs / 0.01kg shells, 1912 Model
     Machine guns in deck mounts
     on centreline, all amidships
   Weight of broadside 64 lbs / 29 kg
   Shells per gun, main battery: 100
   4 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.50" / 13 mm         -               -

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 1 shaft, 10,184 shp / 7,598 Kw = 29.00 kts
   Range 3,500nm at 12.00 kts
   Bunker at max displacement = 83 tons

Complement:
   39 - 51

Cost:
   £0.040 million / $0.161 million

Distribution of weights at normal displacement:
   Armament: 8 tons, 2.4 %
   Armour: 2 tons, 0.6 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 2 tons, 0.6 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 170 tons, 50.7 %
   Hull, fittings & equipment: 89 tons, 26.5 %
   Fuel, ammunition & stores: 56 tons, 16.8 %
   Miscellaneous weights: 10 tons, 3.0 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     68 lbs / 31 Kg = 2.1 x 4.0 " / 102 mm shells or 0.1 torpedoes
   Stability (Unstable if below 1.00): 1.09
   Metacentric height 0.5 ft / 0.1 m
   Roll period: 11.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 46 %
         - Recoil effect (Restricted arc if above 1.00): 0.32
   Seaboat quality  (Average = 1.00): 0.60

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.424
   Length to Beam Ratio: 12.22 : 1
   'Natural speed' for length: 14.83 kts
   Power going to wave formation at top speed: 68 %
   Trim (Max stability = 0, Max steadiness = 100): 71
   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:      10.00 ft / 3.05 m
      - Forecastle (20 %):   8.00 ft / 2.44 m
      - Mid (42 %):      7.00 ft / 2.13 m
      - Quarterdeck (15 %):   7.00 ft / 2.13 m
      - Stern:      7.00 ft / 2.13 m
      - Average freeboard:   7.47 ft / 2.28 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 184.4 %
      - Above water (accommodation/working, high = better): 25.0 %
   Waterplane Area: 2,349 Square feet or 218 Square metres
   Displacement factor (Displacement / loading): 40 %
   Structure weight / hull surface area: 19 lbs/sq ft or 91 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.24
      - Overall: 0.55
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is extremely poor
   Caution: Lacks seaworthiness - very limited seakeeping ability

[P3D]

Some modifications. Got rid of one of the 4" guns for 1kt extra nominal speed. Speed in calm seas/at trial should be 34.7kts.
Misc weight goes into 4 torps and 9 depth charges. There's the default short/range W/T.

If I build a flotilla leader for them, how large should it be?

Orange TB laid down 1916

Displacement:
   310 t light; 320 t standard; 369 t normal; 408 t full load

Dimensions: Length overall / water x beam x draught
   229.74 ft / 228.00 ft x 19.00 ft x 7.50 ft (normal load)
   70.03 m / 69.49 m x 5.79 m  x 2.29 m

Armament:
      1 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1912 Model
     Quick firing gun in deck mount
     on centreline forward
      4 - 0.40" / 10.2 mm guns in single mounts, 0.03lbs / 0.01kg shells, 1912 Model
     Machine guns in deck mounts
     on centreline, all amidships
      1 - 1.00" / 25.4 mm guns in single mounts, 0.50lbs / 0.23kg shells, 1912 Model
     Breech loading gun in deck mount
     on centreline aft
   Weight of broadside 33 lbs / 15 kg
   Shells per gun, main battery: 140
   4 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.50" / 13 mm         -               -

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 1 shaft, 12,071 shp / 9,005 Kw = 30.00 kts
   Range 3,500nm at 12.00 kts
   Bunker at max displacement = 88 tons

Complement:
   41 - 54

Cost:
   £0.042 million / $0.167 million

Distribution of weights at normal displacement:
   Armament: 4 tons, 1.1 %
   Armour: 1 tons, 0.3 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 1 tons, 0.3 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 197 tons, 53.3 %
   Hull, fittings & equipment: 97 tons, 26.4 %
   Fuel, ammunition & stores: 59 tons, 15.9 %
   Miscellaneous weights: 11 tons, 3.0 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     75 lbs / 34 Kg = 2.3 x 4.0 " / 102 mm shells or 0.1 torpedoes
   Stability (Unstable if below 1.00): 1.11
   Metacentric height 0.5 ft / 0.2 m
   Roll period: 11.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 46 %
         - Recoil effect (Restricted arc if above 1.00): 0.13
   Seaboat quality  (Average = 1.00): 0.60

Hull form characteristics:
   Hull has raised forecastle
   Block coefficient: 0.398
   Length to Beam Ratio: 12.00 : 1
   'Natural speed' for length: 15.10 kts
   Power going to wave formation at top speed: 68 %
   Trim (Max stability = 0, Max steadiness = 100): 71
   Bow angle (Positive = bow angles forward): 9.00 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 %):   10.00 ft / 3.05 m (8.00 ft / 2.44 m aft of break)
      - Mid (42 %):      7.00 ft / 2.13 m
      - Quarterdeck (15 %):   7.00 ft / 2.13 m
      - Stern:      7.00 ft / 2.13 m
      - Average freeboard:   7.79 ft / 2.37 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 183.7 %
      - Above water (accommodation/working, high = better): 30.5 %
   Waterplane Area: 2,517 Square feet or 234 Square metres
   Displacement factor (Displacement / loading): 39 %
   Structure weight / hull surface area: 19 lbs/sq ft or 92 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.23
      - 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

[Borys]

This big:
http://www.history.navy.mil/photos/images/g700000/g704702.jpg

[Guinness]

Boris has been in a loopier mood than usual lately...

I think it depends on what you want the service radius of the leader to be. If it needn't be much further than the boats, then probably 500ish tons ought to give you another 4" gun and extra accommodation with the same speed and range.

Or you could go for a real 1000 ton destroyer I suppose.

[The Rock Doctor]

Borys' suggestion lacks the necessary speed for the job, I think.

I'd assume a leader would add additional gunpower, a long-range wireless, and modest command facilities.  A modern 1,000 t destroyer might suffice; a 1,500 t destroyer would certainly do.

Alternately, install these command/communications facilities in whatever tender is used as a base.