Small Warship designs

[Darman]

They look nice.  I'll make decision tonight or tomorrow.  If anyone wants to try their hand at the 800 tonner feel free. 

[Nobody]

How about this one?
P800, German Export patrol sloop laid down 1896

Displacement:
   800 t light; 827 t standard; 1.013 t normal; 1.162 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (218,71 ft / 216,54 ft) x 34,45 ft x (9,19 / 10,22 ft)
   (66,66 m / 66,00 m) x 10,50 m  x (2,80 / 3,11 m)

Armament:
      2 - 4,13" / 105 mm 40,0 cal guns - 37,48lbs / 17,00kg shells, 120 per gun
     Breech loading guns in deck and hoist mounts, 1896 Model
     2 x Single mounts on centreline ends, evenly spread
      4 - 1,97" / 50,0 mm 40,0 cal guns - 3,31lbs / 1,50kg shells, 250 per gun
     Quick firing guns in deck mounts, 1896 Model
     4 x Single mounts on sides, evenly spread
      4 - 0,31" / 8,0 mm 90,0 cal guns - 0,02lbs / 0,01kg shells, 1.500 per gun
     Machine guns in deck mounts, 1896 Model
     4 x Single mounts on sides, evenly spread
      4 raised mounts
      Weight of broadside 88 lbs / 40 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   1,18" / 30 mm   140,75 ft / 42,90 m   7,22 ft / 2,20 m
   Ends:   0,79" / 20 mm     75,75 ft / 23,09 m   7,55 ft / 2,30 m
   Upper:   0,79" / 20 mm   140,75 ft / 42,90 m   7,55 ft / 2,30 m
     Main Belt covers 100% of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0,79" / 20 mm         -         3,15" / 80 mm
   2nd:   0,39" / 10 mm         -               -

   - Protected deck - single deck:
   For and Aft decks: 0,79" / 20 mm
   Forecastle: 0,39" / 10 mm  Quarter deck: 0,79" / 20 mm

   - Conning towers: Forward 1,97" / 50 mm, Aft 1,18" / 30 mm

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 3 shafts, 1.223 ihp / 913 Kw = 14,00 kts
   Range 5.000nm at 10,00 kts
   Bunker at max displacement = 335 tons (100% coal)

Complement:
   89 - 116

Cost:
   £0,063 million / $0,253 million

Distribution of weights at normal displacement:
   Armament: 20 tons, 1,9%
      - Guns: 20 tons, 1,9%
   Armour: 191 tons, 18,8%
      - Belts: 105 tons, 10,4%
      - Armament: 8 tons, 0,8%
      - Armour Deck: 71 tons, 7,0%
      - Conning Towers: 7 tons, 0,7%
   Machinery: 204 tons, 20,1%
   Hull, fittings & equipment: 331 tons, 32,6%
   Fuel, ammunition & stores: 213 tons, 21,1%
   Miscellaneous weights: 55 tons, 5,4%
      - Hull below water: 10 tons
      - Hull above water: 10 tons
      - On freeboard deck: 10 tons
      - Above deck: 25 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     2.046 lbs / 928 Kg = 57,9 x 4,1 " / 105 mm shells or 0,9 torpedoes
   Stability (Unstable if below 1.00): 1,57
   Metacentric height 2,2 ft / 0,7 m
   Roll period: 9,8 seconds
   Steadiness   - As gun platform (Average = 50 %): 80 %
         - Recoil effect (Restricted arc if above 1.00): 0,09
   Seaboat quality  (Average = 1.00): 2,00

Hull form characteristics:
   Hull has raised forecastle,
     a normal bow and a round stern
   Block coefficient (normal/deep): 0,518 / 0,534
   Length to Beam Ratio: 6,29 : 1
   'Natural speed' for length: 14,72 kts
   Power going to wave formation at top speed: 44 %
   Trim (Max stability = 0, Max steadiness = 100): 40
   Bow angle (Positive = bow angles forward): 5,00 degrees
   Stern overhang: 1,08 ft / 0,33 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20,00%,  12,47 ft / 3,80 m,  10,50 ft / 3,20 m
      - Forward deck:   30,00%,  10,17 ft / 3,10 m,  9,84 ft / 3,00 m
      - Aft deck:   35,00%,  9,84 ft / 3,00 m,  9,84 ft / 3,00 m
      - Quarter deck:   15,00%,  9,84 ft / 3,00 m,  10,50 ft / 3,20 m
      - Average freeboard:      10,23 ft / 3,12 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 74,5%
      - Above water (accommodation/working, high = better): 107,2%
   Waterplane Area: 5.050 Square feet or 469 Square metres
   Displacement factor (Displacement / loading): 141%
   Structure weight / hull surface area: 46 lbs/sq ft or 224 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,92
      - Longitudinal: 2,08
      - Overall: 1,00
   Excellent machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather


Btw, fulfilling your requirements for the bigger ones was extremely easy, while the two smaller ones were a bit tricky.

[Darman]

Btw, fulfilling your requirements for the bigger ones was extremely easy, while the two smaller ones were a bit tricky.

Thank for that information.  The bigger ones (especially the 800 tonner) were supposed to be repurposed vessels (hance designation armed steamer) rather than true warships.  The smaller ones were designed as customs patrol craft, having to cram as much in as possible. 

[Darman]

The Brazilians accept this ship from Germany for their armed steamer design. 

P800, German Export patrol sloop laid down 1896

[Darman]

Chileans picked this American design. 

An American-built version of the CPB-H already seen:

CPB-H, Any Customs patrol boat, heavy laid down 1898

Displacement:
   489 t light; 505 t standard; 589 t normal; 657 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (200.00 ft / 200.00 ft) x 25.00 ft x (8.25 / 8.96 ft)
   (60.96 m / 60.96 m) x 7.62 m  x (2.51 / 2.73 m)

Armament:
      1 - 4.00" / 102 mm 40.0 cal gun - 33.00lbs / 14.97kg shells, 150 per gun
     Quick firing gun in deck mount, 1898 Model
     1 x Single mount on centreline forward
      2 - 2.24" / 57.0 mm 45.0 cal guns - 6.00lbs / 2.72kg shells, 200 per gun
     Quick firing guns in deck mounts, 1898 Model
     2 x Single mounts on sides, aft deck centre
      2 - 0.28" / 7.0 mm 80.0 cal guns - 0.01lbs / 0.01kg shells, 600 per gun
     Machine guns in deck mounts, 1898 Model
     2 x Single mounts on sides, forward deck centre
      2 raised mounts
      Weight of broadside 45 lbs / 20 kg

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 2 shafts, 1,130 ihp / 843 Kw = 15.00 kts
   Range 3,250nm at 10.00 kts
   Bunker at max displacement = 153 tons (100% coal)

Complement:
   59 - 77

Cost:
   £0.048 million / $0.190 million

Distribution of weights at normal displacement:
   Armament: 7 tons, 1.2 %
      - Guns: 7 tons, 1.2 %
   Machinery: 204 tons, 34.5 %
   Hull, fittings & equipment: 188 tons, 31.9 %
   Fuel, ammunition & stores: 101 tons, 17.1 %
   Miscellaneous weights: 90 tons, 15.3 %
      - On freeboard deck: 50 tons
      - Above deck: 40 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     591 lbs / 268 Kg = 18.5 x 4.0 " / 102 mm shells or 0.4 torpedoes
   Stability (Unstable if below 1.00): 1.21
   Metacentric height 0.9 ft / 0.3 m
   Roll period: 11.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 100 %
         - Recoil effect (Restricted arc if above 1.00): 0.12
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.500 / 0.513
   Length to Beam Ratio: 8.00 : 1
   'Natural speed' for length: 14.14 kts
   Power going to wave formation at top speed: 46 %
   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 (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  12.00 ft / 3.66 m,  9.00 ft / 2.74 m
      - Forward deck:   30.00 %,  9.00 ft / 2.74 m,  9.00 ft / 2.74 m
      - Aft deck:   35.00 %,  9.00 ft / 2.74 m,  9.00 ft / 2.74 m
      - Quarter deck:   15.00 %,  9.00 ft / 2.74 m,  9.00 ft / 2.74 m
      - Average freeboard:      9.24 ft / 2.82 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 115.8 %
      - Above water (accommodation/working, high = better): 96.8 %
   Waterplane Area: 3,331 Square feet or 309 Square metres
   Displacement factor (Displacement / loading): 114 %
   Structure weight / hull surface area: 34 lbs/sq ft or 166 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.91
      - Longitudinal: 2.33
      - Overall: 1.00
   Cramped machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather


This one's for Chile or Brazil, so the MGs are 7mm x 57 Maxims.  An Argentine version of the same ship would use Maxims in 7.63mm x 53 instead.

Miscellaneous weight allows for an inspection team and their boats to be carried (in wartime, other things can replace these).

[Darman]

Chosen by the Brazilians as their armed sloop. 

P600, German export small Sloop laid down 1895

Displacement:
   600 t light; 619 t standard; 782 t normal; 914 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (198,82 ft / 196,85 ft) x 32,81 ft x (8,20 / 9,25 ft)
   (60,60 m / 60,00 m) x 10,00 m  x (2,50 / 2,82 m)

Armament:
      1 - 4,13" / 105 mm 35,0 cal gun - 37,48lbs / 17,00kg shells, 50 per gun
     Breech loading gun in deck mount, 1895 Model
     1 x Single mount on centreline, aft deck aft
      1 - 3,46" / 88,0 mm 20,0 cal gun - 18,64lbs / 8,46kg shells, 100 per gun
     Quick firing gun in deck mount, 1895 Model
     1 x Single mount on centreline, forward deck forward
      1 raised mount
      4 - 1,46" / 37,0 mm 20,0 cal guns - 0,96lbs / 0,44kg shells, 500 per gun
     Auto rapid fire guns in deck mounts, 1895 Model
     2 x Single mounts on sides amidships
      2 raised mounts
     2 x Single mounts on centreline ends, evenly spread
      2 double raised mounts
      4 - 0,31" / 8,0 mm 75,0 cal guns - 0,02lbs / 0,01kg shells, 1.500 per gun
     Machine guns in deck mounts, 1895 Model
     4 x Single mounts on sides, evenly spread
      4 double raised mounts
      Weight of broadside 60 lbs / 27 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   0,79" / 20 mm   127,95 ft / 39,00 m   6,89 ft / 2,10 m
   Ends:   0,39" / 10 mm     68,86 ft / 20,99 m   6,89 ft / 2,10 m
   Upper:   0,39" / 10 mm   127,95 ft / 39,00 m   8,01 ft / 2,44 m
     Main Belt covers 100% of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0,59" / 15 mm         -               -
   2nd:   0,39" / 10 mm         -               -
   4th:   0,39" / 10 mm         -               -

   - Protected deck - single deck:
   For and Aft decks: 0,39" / 10 mm
   Forecastle: 0,39" / 10 mm  Quarter deck: 0,59" / 15 mm

   - Conning towers: Forward 1,18" / 30 mm, Aft 0,79" / 20 mm

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 1.081 ihp / 807 Kw = 14,00 kts
   Range 5.000nm at 10,00 kts
   Bunker at max displacement = 295 tons (100% coal)

Complement:
   73 - 96

Cost:
   £0,049 million / $0,194 million

Distribution of weights at normal displacement:
   Armament: 7 tons, 0,8%
      - Guns: 7 tons, 0,8%
   Armour: 99 tons, 12,6%
      - Belts: 55 tons, 7,0%
      - Armament: 7 tons, 0,8%
      - Armour Deck: 34 tons, 4,3%
      - Conning Towers: 4 tons, 0,5%
   Machinery: 183 tons, 23,4%
   Hull, fittings & equipment: 271 tons, 34,7%
   Fuel, ammunition & stores: 183 tons, 23,4%
   Miscellaneous weights: 40 tons, 5,1%
      - Hull below water: 5 tons
      - Hull above water: 5 tons
      - On freeboard deck: 5 tons
      - Above deck: 25 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1.581 lbs / 717 Kg = 44,7 x 4,1 " / 105 mm shells or 0,8 torpedoes
   Stability (Unstable if below 1.00): 1,54
   Metacentric height 1,9 ft / 0,6 m
   Roll period: 9,9 seconds
   Steadiness   - As gun platform (Average = 50 %): 100 %
         - Recoil effect (Restricted arc if above 1.00): 0,10
   Seaboat quality  (Average = 1.00): 2,00

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a round stern
   Block coefficient (normal/deep): 0,517 / 0,535
   Length to Beam Ratio: 6,00 : 1
   'Natural speed' for length: 14,03 kts
   Power going to wave formation at top speed: 46 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 0,00 degrees
   Stern overhang: 1,97 ft / 0,60 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20,00%,  14,76 ft / 4,50 m,  12,63 ft / 3,85 m
      - Forward deck:   40,00%,  12,63 ft / 3,85 m,  12,63 ft / 3,85 m
      - Aft deck:   25,00%,  6,30 ft / 1,92 m,  6,30 ft / 1,92 m
      - Quarter deck:   15,00%,  6,30 ft / 1,92 m,  6,30 ft / 1,92 m
      - Average freeboard:      10,27 ft / 3,13 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 80,6%
      - Above water (accommodation/working, high = better): 116,3%
   Waterplane Area: 4.371 Square feet or 406 Square metres
   Displacement factor (Displacement / loading): 150%
   Structure weight / hull surface area: 43 lbs/sq ft or 208 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,91
      - Longitudinal: 2,41
      - Overall: 1,00
   Excellent machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

[Darman]

New Chilean small patrol boat. 

And here is how the same ship could look without armor:
P250, German Export Patrol boat laid down 1898

Displacement:
   250 t light; 259 t standard; 313 t normal; 356 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (141,06 ft / 137,80 ft) x 26,25 ft x (5,91 / 6,55 ft)
   (43,00 m / 42,00 m) x 8,00 m  x (1,80 / 2,00 m)

Armament:
      1 - 3,46" / 88,0 mm 30,0 cal gun - 15,43lbs / 7,00kg shells, 150 per gun
     Quick firing gun in deck mount, 1898 Model
     1 x Single mount on centreline, aft deck aft
      1 - 1,46" / 37,0 mm 20,0 cal gun - 1,39lbs / 0,63kg shells, 1.000 per gun
     Auto rapid fire gun in deck mount, 1898 Model
     1 x Single mount on centreline, forward deck forward
      1 raised mount
      4 - 0,31" / 8,0 mm 75,0 cal guns - 0,02lbs / 0,01kg shells, 1.500 per gun
     Machine guns in deck mounts, 1898 Model
     4 x Single mounts on sides, evenly spread
      4 raised mounts
      Weight of broadside 17 lbs / 8 kg

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

   - Conning towers: Forward 1,57" / 40 mm, Aft 0,79" / 20 mm

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 1 shaft, 714 ihp / 533 Kw = 14,00 kts
   Range 5.000nm at 8,00 kts
   Bunker at max displacement = 98 tons (100% coal)

Complement:
   36 - 48

Cost:
   £0,026 million / $0,103 million

Distribution of weights at normal displacement:
   Armament: 3 tons, 0,9%
      - Guns: 3 tons, 0,9%
   Armour: 3 tons, 1,0%
      - Armament: 1 tons, 0,3%
      - Conning Towers: 2 tons, 0,7%
   Machinery: 115 tons, 36,8%
   Hull, fittings & equipment: 102 tons, 32,7%
   Fuel, ammunition & stores: 63 tons, 20,0%
   Miscellaneous weights: 27 tons, 8,6%
      - Hull below water: 1 tons
      - On freeboard deck: 1 tons
      - Above deck: 25 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     348 lbs / 158 Kg = 16,8 x 3,5 " / 88 mm shells or 0,3 torpedoes
   Stability (Unstable if below 1.00): 1,64
   Metacentric height 1,5 ft / 0,5 m
   Roll period: 8,9 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0,03
   Seaboat quality  (Average = 1.00): 1,39

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a round stern
   Block coefficient (normal/deep): 0,513 / 0,526
   Length to Beam Ratio: 5,25 : 1
   'Natural speed' for length: 11,74 kts
   Power going to wave formation at top speed: 57 %
   Trim (Max stability = 0, Max steadiness = 100): 51
   Bow angle (Positive = bow angles forward): 5,00 degrees
   Stern overhang: 2,17 ft / 0,66 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20,00%,  12,60 ft / 3,84 m,  10,30 ft / 3,14 m
      - Forward deck:   30,00%,  10,30 ft / 3,14 m,  10,30 ft / 3,14 m
      - Aft deck:   35,00%,  5,15 ft / 1,57 m,  5,15 ft / 1,57 m
      - Quarter deck:   15,00%,  5,15 ft / 1,57 m,  5,15 ft / 1,57 m
      - Average freeboard:      7,91 ft / 2,41 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 122,5%
      - Above water (accommodation/working, high = better): 93,6%
   Waterplane Area: 2.350 Square feet or 218 Square metres
   Displacement factor (Displacement / loading): 117%
   Structure weight / hull surface area: 30 lbs/sq ft or 147 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,89
      - Longitudinal: 2,77
      - Overall: 1,00
   Cramped machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

[Darman]

Thank you guys for your designs.