WesWorld

Hi folks I have been messing around with gunboat designs. what do you think?

C 1, Iberia Gunboat laid down 1913

Displacement:
1,132 t light; 1,173 t standard; 1,373 t normal; 1,528 t full load
Loading submergence 170 tons/feet

Dimensions:
246.06 ft x 36.09 ft x 9.84 ft (normal load)
75.00 m x 11.00 m x 3.00 m

Armament:
4 - 3.94" / 100 mm guns
8 - 2.24" / 57 mm guns
Secondary guns mounted low & subject to being washed down in a seaway
Weight of broadside 167 lbs / 76 kg

Armour:
Belt 1.18" / 30 mm, upper belt 0.79" / 20 mm, end belts 0.79" / 20 mm
Belts cover 67 % of normal area
Main gun shields 0.79" / 20 mm, 2nd casemates 0.79" / 20 mm
Armour deck 0.79" / 20 mm

Machinery:
Oil fired boilers, complex reciprocating steam engines,
Direct drive, 2 shafts, 3,776 ihp / 2,817 Kw = 18.00 kts
Range 8,000nm at 10.00 kts

Complement:
112 - 146

Cost:
£0.097 million / $0.388 million

Distribution of weights at normal displacement:
Armament: 21 tons, 1.5 %
Armour: 175 tons, 12.7 %
Belts: 80 tons, 5.8 %, Armament: 8 tons, 0.6 %, Armour Deck: 87 tons, 6.3 %
Conning Tower: 0 tons, 0.0 %, Torpedo bulkhead: 0 tons, 0.0 %
Machinery: 227 tons, 16.5 %
Hull, fittings & equipment: 709 tons, 51.6 %
Fuel, ammunition & stores: 242 tons, 17.6 %
Miscellaneous weights: 0 tons, 0.0 %

Metacentric height 1.7

Remarks:
Hull space for machinery, storage & compartmentation is excellent
Room for accommodation & workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.28
Shellfire needed to sink: 2,842 lbs / 1,289 Kg = 93.1 x 3.9 " / 100 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 1.2
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 70 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.11
Relative quality as seaboat: 1.37

Hull form characteristics:
Block coefficient: 0.550
Sharpness coefficient: 0.39
Hull speed coefficient 'M': 6.77
'Natural speed' for length: 15.69 kts
Power going to wave formation at top speed: 54 %
Trim: 51
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 66.2 %
Relative accommodation and working space: 116.2 %
(Average = 100%)
Displacement factor: 173 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 1.47
(Structure weight / hull surface area: 77 lbs / square foot or 377 Kg / square metre)
Relative longitudinal hull strength: 3.16
(for 11.48 ft / 3.50 m average freeboard, freeboard adjustment 1.30 ft)
Relative composite hull strength: 1.59

Some here will say she is too slow, while I will say she is either under gunned or should also be armed with torpedos. In my opinion you should either up gun to a 4.5/4.7" gun and remove one gun from the design, or increase the speed, or add torpedo's to the existing design, or all of the above. The last option will run up your tonnage though and then she will be a destroyer.

hmm it's a gunboat. policing etc. like SMS Panther. second line, not front line. much better armed and faster than panther though.

Bernhard