Designs sougth

[ledeper]

The Baltic confederation seeks designs for a small fast destroyer for anti-piracy patrolls
in the Carribien;armed with 2 4" guns minimum, no torpedo-tubes ,but with a low draft

[The Rock Doctor]

Given a day or so, Gran Colombia will draw on its expertise in the region to submit one or more designs.

[Korpen]

Aware that this might not at all be what you are looking for.
The reason for having mixed propulsion is to try and utilise the superior fuel economy of reciprocating engines as low speed. Most of the time it is expected that she will happily putter around at below 10kts, and then the turbines will just be fuel hogs. Her speed is fairly low by warships standard, but as she is intended for ant piracy operations this is not seen as a problem, even the fastest converted merchantmen (as it can be expected pirates have) is not going to exceed 15-16kts, so her speed is plenty to catch them (or run from them).

She got enough misc weight for a radio set and extra weapons lockers and conform facilities for the crew (embarked marines are expected to be part of the regular crew and do not require extra weight).


KM den Schelde Type 1, BC Patrolboat laid down 1910 (Engine 1909)

Displacement:
   400 t light; 414 t standard; 457 t normal; 491 t full load

Dimensions: Length overall / water x beam x draught
   223,10 ft / 223,10 ft x 21,69 ft x 5,51 ft (normal load)
   68,00 m / 68,00 m x 6,61 m  x 1,68 m

Armament:
      2 - 3,94" / 100 mm guns in single mounts, 30,51lbs / 13,84kg shells, 1910 Model
     Breech loading guns in deck mounts
     on centreline ends, evenly spread
      4 - 0,31" / 8,0 mm guns in single mounts, 0,02lbs / 0,01kg shells, 1910 Model
     Machine guns in deck mounts
     on side, all amidships
   Weight of broadside 61 lbs / 28 kg
   Shells per gun, main battery: 150

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0,39" / 10 mm         -               -
   2nd:   0,39" / 10 mm         -               -

   - Conning tower: 0,59" / 15 mm

Machinery:
   Oil fired boilers, reciprocating cruising steam engines plus steam turbines,
   Direct drive, 3 shafts, 3 614 ihp / 2 696 Kw = 21,00 kts
   Range 3 000nm at 10,00 kts
   Bunker at max displacement = 77 tons

Complement:
   49 - 64

Cost:
   £0,047 million / $0,189 million

Distribution of weights at normal displacement:
   Armament: 8 tons, 1,7 %
   Armour: 2 tons, 0,5 %
      - Belts: 0 tons, 0,0 %
      - Torpedo bulkhead: 0 tons, 0,0 %
      - Armament: 2 tons, 0,4 %
      - Armour Deck: 0 tons, 0,0 %
      - Conning Tower: 1 tons, 0,2 %
   Machinery: 192 tons, 41,9 %
   Hull, fittings & equipment: 182 tons, 39,9 %
   Fuel, ammunition & stores: 57 tons, 12,5 %
   Miscellaneous weights: 16 tons, 3,5 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     323 lbs / 146 Kg = 10,6 x 3,9 " / 100 mm shells or 0,2 torpedoes
   Stability (Unstable if below 1.00): 1,36
   Metacentric height 0,9 ft / 0,3 m
   Roll period: 9,8 seconds
   Steadiness   - As gun platform (Average = 50 %): 56 %
         - Recoil effect (Restricted arc if above 1.00): 0,15
   Seaboat quality  (Average = 1.00): 1,13

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0,600
   Length to Beam Ratio: 10,29 : 1
   'Natural speed' for length: 14,94 kts
   Power going to wave formation at top speed: 59 %
   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:      16,08 ft / 4,90 m
      - Forecastle (20 %):   11,48 ft / 3,50 m
      - Mid (52 %):      11,48 ft / 3,50 m (4,92 ft / 1,50 m aft of break)
      - Quarterdeck (15 %):   4,92 ft / 1,50 m
      - Stern:      4,92 ft / 1,50 m
      - Average freeboard:   8,70 ft / 2,65 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 152,1 %
      - Above water (accommodation/working, high = better): 112,1 %
   Waterplane Area: 3 539 Square feet or 329 Square metres
   Displacement factor (Displacement / loading): 96 %
   Structure weight / hull surface area: 31 lbs/sq ft or 151 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,94
      - Longitudinal: 1,74
      - Overall: 1,00
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is adequate

[ledeper]

nice-very close to my thougths :) :)
Enter ship name, Enter country Enter ship type laid down 1911 (Engine 1909)

Displacement:
   517 t light; 538 t standard; 590 t normal; 631 t full load

Dimensions: Length overall / water x beam x draught
   224,54 ft / 223,10 ft x 21,65 ft x 5,58 ft (normal load)
   68,44 m / 68,00 m x 6,60 m  x 1,70 m

Armament:
      2 - 4,00" / 102 mm guns in single mounts, 32,00lbs / 14,51kg shells, 1911 Model
     Quick firing guns in deck mounts
     on centreline ends, evenly spread
      4 - 0,50" / 12,7 mm guns in single mounts, 0,06lbs / 0,03kg shells, 1911 Model
     Machine guns in deck mounts
     on side, evenly spread
   Weight of broadside 64 lbs / 29 kg
   Shells per gun, main battery: 250

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0,39" / 10 mm         -               -
   2nd:   0,39" / 10 mm         -               -

   - Conning tower: 0,79" / 20 mm

Machinery:
   Oil fired boilers, reciprocating cruising steam engines plus steam turbines,
   Direct drive, 3 shafts, 4.579 ihp / 3.416 Kw = 21,00 kts
   Range 3.000nm at 10,00 kts
   Bunker at max displacement = 93 tons

Complement:
   59 - 77

Cost:
   £0,060 million / $0,241 million

Distribution of weights at normal displacement:
   Armament: 8 tons, 1,4 %
   Armour: 3 tons, 0,5 %
      - Belts: 0 tons, 0,0 %
      - Torpedo bulkhead: 0 tons, 0,0 %
      - Armament: 2 tons, 0,3 %
      - Armour Deck: 0 tons, 0,0 %
      - Conning Tower: 1 tons, 0,2 %
   Machinery: 252 tons, 42,8 %
   Hull, fittings & equipment: 237 tons, 40,2 %
   Fuel, ammunition & stores: 73 tons, 12,3 %
   Miscellaneous weights: 17 tons, 2,9 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     431 lbs / 196 Kg = 13,5 x 4,0 " / 102 mm shells or 0,3 torpedoes
   Stability (Unstable if below 1.00): 1,23
   Metacentric height 0,7 ft / 0,2 m
   Roll period: 10,6 seconds
   Steadiness   - As gun platform (Average = 50 %): 72 %
         - Recoil effect (Restricted arc if above 1.00): 0,24
   Seaboat quality  (Average = 1.00): 1,45

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0,766
   Length to Beam Ratio: 10,30 : 1
   'Natural speed' for length: 14,94 kts
   Power going to wave formation at top speed: 62 %
   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:      16,44 ft / 5,01 m
      - Forecastle (20 %):   10,47 ft / 3,19 m
      - Mid (50 %):      10,47 ft / 3,19 m
      - Quarterdeck (15 %):   10,47 ft / 3,19 m
      - Stern:      10,47 ft / 3,19 m
      - Average freeboard:   10,94 ft / 3,34 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 152,6 %
      - Above water (accommodation/working, high = better): 138,6 %
   Waterplane Area: 4.103 Square feet or 381 Square metres
   Displacement factor (Displacement / loading): 100 %
   Structure weight / hull surface area: 31 lbs/sq ft or 150 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,87
      - Longitudinal: 3,37
      - Overall: 1,00
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is excellent
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

[The Rock Doctor]

I was thinking along the lines of a high-speed vessel, myself, for sprints out to the site of the trouble.  There's miscellaneous weight to support a wireless and a handful of ship's troops.

Enter ship name, Enter country Enter ship type laid down 1909

Displacement:
   380 t light; 397 t standard; 445 t normal; 484 t full load

Dimensions: Length overall / water x beam x draught
   232.90 ft / 229.66 ft x 22.97 ft x 6.56 ft (normal load)
   70.99 m / 70.00 m x 7.00 m  x 2.00 m

Armament:
      2 - 3.94" / 100 mm guns in single mounts, 30.51lbs / 13.84kg shells, 1909 Model
     Breech loading guns in deck mounts
     on centreline ends, evenly spread
      2 - 1.57" / 40.0 mm guns in single mounts, 1.95lbs / 0.89kg shells, 1909 Model
     Quick firing guns in deck mounts
     on side, all amidships, all raised mounts - superfiring
      4 - 0.31" / 8.0 mm guns (2x2 guns), 0.02lbs / 0.01kg shells, 1909 Model
     Machine guns in deck mounts
     on side, evenly spread, 1 raised mount
   Weight of broadside 65 lbs / 29 kg
   Shells per gun, main battery: 200

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:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 8,000 shp / 5,968 Kw = 26.12 kts
   Range 3,000nm at 10.00 kts (Bunkerage = 87 tons)

Complement:
   47 - 62

Cost:
   £0.050 million / $0.200 million

Distribution of weights at normal displacement:
   Armament: 8 tons, 1.8 %
   Armour: 6 tons, 1.3 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 6 tons, 1.3 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 213 tons, 47.9 %
   Hull, fittings & equipment: 126 tons, 28.4 %
   Fuel, ammunition & stores: 65 tons, 14.6 %
   Miscellaneous weights: 27 tons, 6.1 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     136 lbs / 62 Kg = 4.4 x 3.9 " / 100 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.29
   Metacentric height 0.9 ft / 0.3 m
   Roll period: 10.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.19
   Seaboat quality  (Average = 1.00): 1.07

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0.450
   Length to Beam Ratio: 10.00 : 1
   'Natural speed' for length: 15.15 kts
   Power going to wave formation at top speed: 66 %
   Trim (Max stability = 0, Max steadiness = 100): 66
   Bow angle (Positive = bow angles forward): 10.00 degrees
   Stern overhang: -3.28 ft / -1.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      18.37 ft / 5.60 m
      - Forecastle (20 %):   14.44 ft / 4.40 m
      - Mid (40 %):      14.44 ft / 4.40 m (6.56 ft / 2.00 m aft of break)
      - Quarterdeck (15 %):   6.56 ft / 2.00 m
      - Stern:      6.56 ft / 2.00 m
      - Average freeboard:   10.03 ft / 3.06 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 175.7 %
      - Above water (accommodation/working, high = better): 122.5 %
   Waterplane Area: 3,364 Square feet or 313 Square metres
   Displacement factor (Displacement / loading): 52 %
   Structure weight / hull surface area: 20 lbs/sq ft or 96 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.77
      - Overall: 0.56
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is excellent
   Ship has slow, easy roll, a good, steady gun platform