Large Gunboat

[miketr]

Something to show the flag in various places...  Got the idea from USS Erie

Edit: Forgot the gunshields...

GB-1916, Iberia Gun Boat laid down 1916 (Engine 1912)

Displacement:
   2,000 t light; 2,085 t standard; 2,737 t normal; 3,258 t full load

Dimensions: Length overall / water x beam x draught
   333.80 ft / 328.08 ft x 41.01 ft x 11.48 ft (normal load)
   101.74 m / 100.00 m x 12.50 m  x 3.50 m

Armament:
      3 - 5.91" / 150 mm guns in single mounts, 102.98lbs / 46.71kg shells, 1916 Model
     Breech loading guns in deck mounts with hoists
     on centreline ends, majority forward, 1 raised mount
      4 - 1.97" / 50.0 mm guns in single mounts, 3.81lbs / 1.73kg shells, 1916 Model
     Quick firing guns in deck mounts
     on side, all amidships
      2 - 2.95" / 75.0 mm guns in single mounts, 12.87lbs / 5.84kg shells, 1916 Model
     Anti-aircraft guns in deck mounts
     on side, evenly spread, all raised mounts
      4 - 0.49" / 12.5 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1916 Model
     Machine guns in deck mounts
     on side, evenly spread, all raised mounts
   Weight of broadside 350 lbs / 159 kg
   Shells per gun, main battery: 150

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   3.94" / 100 mm   213.25 ft / 65.00 m   7.68 ft / 2.34 m
   Ends:   Unarmoured
     Main Belt covers 100 % of normal length

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

   - Armour deck: 1.97" / 50 mm, Conning tower: 5.91" / 150 mm

Machinery:
   Coal fired boilers, steam turbines,
   Direct drive, 2 shafts, 8,000 shp / 5,968 Kw = 20.02 kts
   Range 13,200nm at 10.00 kts
   Bunker at max displacement = 1,173 tons (100% coal)

Complement:
   188 - 245

Cost:
   £0.255 million / $1.020 million

Distribution of weights at normal displacement:
   Armament: 44 tons, 1.6 %
   Armour: 679 tons, 24.8 %
      - Belts: 276 tons, 10.1 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 14 tons, 0.5 %
      - Armour Deck: 365 tons, 13.3 %
      - Conning Tower: 25 tons, 0.9 %
   Machinery: 351 tons, 12.8 %
   Hull, fittings & equipment: 894 tons, 32.7 %
   Fuel, ammunition & stores: 737 tons, 26.9 %
   Miscellaneous weights: 32 tons, 1.2 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     6,518 lbs / 2,956 Kg = 63.3 x 5.9 " / 150 mm shells or 1.8 torpedoes
   Stability (Unstable if below 1.00): 1.35
   Metacentric height 2.2 ft / 0.7 m
   Roll period: 11.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 76 %
         - Recoil effect (Restricted arc if above 1.00): 0.26
   Seaboat quality  (Average = 1.00): 1.53

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.620
   Length to Beam Ratio: 8.00 : 1
   'Natural speed' for length: 18.11 kts
   Power going to wave formation at top speed: 52 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 15.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      21.33 ft / 6.50 m
      - Forecastle (20 %):   16.40 ft / 5.00 m
      - Mid (50 %):      11.48 ft / 3.50 m
      - Quarterdeck (15 %):   11.48 ft / 3.50 m
      - Stern:      11.48 ft / 3.50 m
      - Average freeboard:   13.60 ft / 4.15 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 56.4 %
      - Above water (accommodation/working, high = better): 128.2 %
   Waterplane Area: 10,026 Square feet or 931 Square metres
   Displacement factor (Displacement / loading): 155 %
   Structure weight / hull surface area: 59 lbs/sq ft or 290 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.95
      - Longitudinal: 1.58
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is excellent
   Room for accommodation and workspaces is excellent
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

[Guinness]

Might be just the thing to keep an eye on things around the Philippines...

[miketr]

Thats the idea... perhaps a few other places...

After I finish my BB's I need to build more cruisers, support ships, tankers, etc...

Michael

[Guinness]

I swear: someone with an inkling to do that sort of work for a while could make a killing building a standard tanker design for the rest of the world.

[miketr]

Something like this?

AC/T-1916, Iberia Collier / Tanker laid down 1916 (Engine 1912)

Displacement:
   4,481 t light; 4,865 t standard; 18,081 t normal; 28,654 t full load

Dimensions: Length overall / water x beam x draught
   459.32 ft / 459.32 ft x 65.62 ft x 26.25 ft (normal load)
   140.00 m / 140.00 m x 20.00 m  x 8.00 m

Armament:
      2 - 5.91" / 150 mm guns in single mounts, 102.98lbs / 46.71kg shells, 1916 Model
     Breech loading guns in deck mounts
     on centreline ends, evenly spread
      4 - 2.95" / 75.0 mm guns in single mounts, 12.87lbs / 5.84kg shells, 1916 Model
     Anti-aircraft guns in deck mounts
     on side, all amidships
   Weight of broadside 257 lbs / 117 kg
   Shells per gun, main battery: 150

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

Machinery:
   Coal fired boilers, steam turbines,
   Direct drive, 2 shafts, 24,000 shp / 17,904 Kw = 20.02 kts
   Range 90,000nm at 10.00 kts
   Bunker at max displacement = 23,788 tons (100% coal)

Complement:
   779 - 1,013

Cost:
   £0.542 million / $2.168 million

Distribution of weights at normal displacement:
   Armament: 32 tons, 0.2 %
   Armour: 9 tons, 0.1 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 9 tons, 0.1 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 1,053 tons, 5.8 %
   Hull, fittings & equipment: 3,268 tons, 18.1 %
   Fuel, ammunition & stores: 13,600 tons, 75.2 %
   Miscellaneous weights: 119 tons, 0.7 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     104,514 lbs / 47,407 Kg = 1,014.9 x 5.9 " / 150 mm shells or 11.4 torpedoes
   Stability (Unstable if below 1.00): 2.63
   Metacentric height 11.3 ft / 3.4 m
   Roll period: 8.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 80 %
         - Recoil effect (Restricted arc if above 1.00): 0.01
   Seaboat quality  (Average = 1.00): 1.60

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.800
   Length to Beam Ratio: 7.00 : 1
   'Natural speed' for length: 21.43 kts
   Power going to wave formation at top speed: 51 %
   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:      19.69 ft / 6.00 m
      - Forecastle (20 %):   16.40 ft / 5.00 m
      - Mid (50 %):      14.76 ft / 4.50 m
      - Quarterdeck (15 %):   14.76 ft / 4.50 m
      - Stern:      14.76 ft / 4.50 m
      - Average freeboard:   15.60 ft / 4.76 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 22.8 %
      - Above water (accommodation/working, high = better): 97.5 %
   Waterplane Area: 26,339 Square feet or 2,447 Square metres
   Displacement factor (Displacement / loading): 726 %
   Structure weight / hull surface area: 86 lbs/sq ft or 419 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.97
      - Longitudinal: 1.28
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is excellent
   Room for accommodation and workspaces is adequate
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

[Jefgte]

Good concept

IMO,I increase slightly armament to repulse a DD atack (120mm in place of 75mm)
Good speed to be with a BBs squadron.
They could be use also as auxiliary cruiser or raider
& with that gun boat collier, GBC , you must not pay the 5$ surtaxe !!!


Jef  ;)

[Guinness]

Re: Oiler/Collier:

I still have no idea what a good speed for such a ship is. It's my instinct that top speed doesn't matter as much, since I'd expect one would get sent far away from battle should one appear likely. Crusing speed probably does matter though, especially once underway refueling comes along.

Poking around at US examples, what sources I can find say the Cimarron class of WW2 only did something between 16 and 19 knots. This was with 30,400 SHP, but they were also over 24,000t full load.

What examples I can find from WW1 of US Colliers and Oilers seemed to be quite a bit slower.

Of course, the US is hardly the only set of examples out there, and later I may try to find the speed for other navy's ships...

[miketr]

I am going for max speed of 20 knots... odds are it is too fast...  especially looking at WW2 convoy speeds but I want something able to keep up with the battleline...

Below is a small collier / tanker...  Figure build 4 of the larger ones and 12 of the smaller ones...  half for the Pacific and half for the Atlantic.  4.5 BP's for the large ones and 6.3 BP's for the smaller.

Michael

AC/T-1916 (small), Iberia Collier / Tanker laid down 1916 (Engine 1912)

Displacement:
   2,100 t light; 2,246 t standard; 6,921 t normal; 10,661 t full load

Dimensions: Length overall / water x beam x draught
   328.08 ft / 328.08 ft x 46.88 ft x 19.69 ft (normal load)
   100.00 m / 100.00 m x 14.29 m  x 6.00 m

Armament:
      2 - 4.13" / 105 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1916 Model
     Breech loading guns in deck mounts
     on centreline ends, evenly spread
      1 - 2.95" / 75.0 mm guns in single mounts, 12.87lbs / 5.84kg shells, 1916 Model
     Anti-aircraft gun in deck mount
     on side amidships
   Weight of broadside 84 lbs / 38 kg
   Shells per gun, main battery: 150

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

Machinery:
   Coal fired boilers, steam turbines,
   Direct drive, 2 shafts, 16,000 shp / 11,936 Kw = 20.27 kts
   Range 56,510nm at 10.00 kts
   Bunker at max displacement = 8,415 tons (100% coal)

Complement:
   379 - 493

Cost:
   £0.295 million / $1.182 million

Distribution of weights at normal displacement:
   Armament: 10 tons, 0.2 %
   Armour: 5 tons, 0.1 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 5 tons, 0.1 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 702 tons, 10.1 %
   Hull, fittings & equipment: 1,315 tons, 19.0 %
   Fuel, ammunition & stores: 4,821 tons, 69.7 %
   Miscellaneous weights: 68 tons, 1.0 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     24,831 lbs / 11,263 Kg = 703.0 x 4.1 " / 105 mm shells or 4.2 torpedoes
   Stability (Unstable if below 1.00): 2.23
   Metacentric height 5.5 ft / 1.7 m
   Roll period: 8.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 61 %
         - Recoil effect (Restricted arc if above 1.00): 0.01
   Seaboat quality  (Average = 1.00): 1.23

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.800
   Length to Beam Ratio: 7.00 : 1
   'Natural speed' for length: 18.11 kts
   Power going to wave formation at top speed: 61 %
   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:      19.69 ft / 6.00 m
      - Forecastle (20 %):   16.40 ft / 5.00 m
      - Mid (50 %):      13.12 ft / 4.00 m
      - Quarterdeck (15 %):   13.12 ft / 4.00 m
      - Stern:      13.12 ft / 4.00 m
      - Average freeboard:   14.53 ft / 4.43 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 36.7 %
      - Above water (accommodation/working, high = better): 93.8 %
   Waterplane Area: 13,442 Square feet or 1,249 Square metres
   Displacement factor (Displacement / loading): 444 %
   Structure weight / hull surface area: 64 lbs/sq ft or 311 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.94
      - Longitudinal: 1.76
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is excellent
   Room for accommodation and workspaces is adequate
   Good seaboat, rides out heavy weather easily

[The Rock Doctor]

Four large and twelve small sounds like overkill, really. 

[miketr]

2 A-C/TL & 6 A-C/TS in the Atlantic and in the Pacific.  As I have to support to locations.  Also in the event of a war I need to consider yard time and or war losses. 

Yes for the raw size of the Iberian navy 4 & 12 is too big but I need to be able to support things around the globe.  Also some will be tankers and some will colliars so...  Odds are half and half...

Michael

[P3D]

Or Iberia could simplify logistics by making the Far East/Indian Ocean fleet oil firing.

[miketr]

The European Fleet would make more sense; the Philippines have large coal fields.  Oil isn't an a real choice from the obvious source in the area.

Michael