WesWorld

C 13, Iberia Gunboat laid down 1922

Displacement:
1,932 t light; 2,019 t standard; 2,547 t normal; 2,959 t full load
Loading submergence 246 tons/feet

Dimensions:
301.84 ft x 45.93 ft x 13.12 ft (normal load)
92.00 m x 14.00 m x 4.00 m

Armament:
6 - 2.24" / 57 mm guns (2 Main turrets x 3 guns, 2 superfiring turrets)
6 - 5.12" / 130 mm guns (2 2nd turrets x 3 guns)
8 - 0.53" / 14 mm guns
Weight of broadside 437 lbs / 198 kg

Armour:
Belt 1.57" / 40 mm, ends unarmoured
Belts cover 92 % of normal area
Main turrets 0.79" / 20 mm, 2nd turrets 1.57" / 40 mm

Machinery:
Oil fired boilers, steam turbines plus diesel motors,
Electric motors, 2 shafts, 15,985 shp / 11,925 Kw = 24.00 kts
Range 8,000nm at 15.00 kts

Complement:
179 - 233

Cost:
£0.516 million / $2.066 million

Distribution of weights at normal displacement:
Armament: 55 tons, 2.1 %
Armour: 169 tons, 6.6 %
Belts: 100 tons, 3.9 %, Armament: 69 tons, 2.7 %, Armour Deck: 0 tons, 0.0 %
Conning Tower: 0 tons, 0.0 %, Torpedo bulkhead: 0 tons, 0.0 %
Machinery: 542 tons, 21.3 %
Hull, fittings & equipment: 1,041 tons, 40.9 %
Fuel, ammunition & stores: 615 tons, 24.2 %
Miscellaneous weights: 125 tons, 4.9 %

Metacentric height 2.0

Remarks:
Hull space for machinery, storage & compartmentation is adequate
Room for accommodation & workspaces is excellent
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: 1.15
Shellfire needed to sink: 3,878 lbs / 1,759 Kg = 686.2 x 2.2 " / 57 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 1.0
(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: 0.35
Relative quality as seaboat: 1.21

Hull form characteristics:
Block coefficient: 0.490
Sharpness coefficient: 0.38
Hull speed coefficient 'M': 6.76
'Natural speed' for length: 17.37 kts
Power going to wave formation at top speed: 63 %
Trim: 58
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 91.4 %
Relative accommodation and working space: 151.6 %
(Average = 100%)
Displacement factor: 140 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.88
(Structure weight / hull surface area: 73 lbs / square foot or 354 Kg / square metre)
Relative longitudinal hull strength: 3.06
(for 16.57 ft / 5.05 m average freeboard, freeboard adjustment 5.05 ft)
Relative composite hull strength: 1.00

misc weight is for combined propuslion and ASW gear

"6 - 2.24" / 57 mm guns (2 Main turrets x 3 guns, 2 superfiring turrets)
6 - 5.12" / 130 mm guns (2 2nd turrets x 3 guns) "

Nice trick...

Shouldn´t the largest guns be the main guns? How does your design look like if you turn that around?

Regards,

HoOmAn

That trick is actually (c)Roojen and has been used numerous times by him and me. If I don't do it, stability increases and so does strength. It is a way of making a design fairer.

Yes it is a nice trick, isn't it. Wether I am actually the first to do that, I'm not sure.
(c)rooijen? aren't you exagerating a bit? :-)
Used it for the first time on the second version of the Atatake design:

Atatake, Japan Monitor laid down 1924

Displacement:
7,384 t light; 7,943 t standard; 9,933 t normal; 11,485 t full load
Loading submergence 576 tons/feet

Dimensions:
430.00 ft x 70.00 ft x 21.00 ft (normal load)
131.06 m x 21.34 m x 6.40 m

Armament:
4 - 7.87" / 200 mm guns (2 Main turrets x 2 guns, 2 superfiring turrets)
4 - 11.81" / 300 mm guns (2 2nd turrets x 2 guns)
12 - 1.97" / 50 mm AA guns
24 - 0.98" / 25 mm guns
Weight of broadside 4,329 lbs / 1,964 kg

Armour:
Belt 7.00" / 178 mm, ends unarmoured
Belts cover 61 % of normal area
Main turrets 10.00" / 254 mm, 2nd turrets 4.00" / 102 mm
AA gun shields 1.00" / 25 mm, Light gun shields 1.00" / 25 mm
Armour deck 3.00" / 76 mm, Conning tower 8.00" / 203 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 3 shafts, 15,953 shp / 11,901 Kw = 20.00 kts
Range 14,000nm at 15.00 kts

Complement:
497 - 646

Cost:
£2.431 million / $9.724 million

Distribution of weights at normal displacement:
Armament: 541 tons, 5.4 %
Armour: 2,526 tons, 25.4 %
Belts: 521 tons, 5.2 %, Armament: 806 tons, 8.1 %, Armour Deck: 1,119 tons, 11.3 %
Conning Tower: 80 tons, 0.8 %, Torpedo bulkhead: 0 tons, 0.0 %
Machinery: 525 tons, 5.3 %
Hull, fittings & equipment: 3,791 tons, 38.2 %
Fuel, ammunition & stores: 2,549 tons, 25.7 %
Miscellaneous weights: 0 tons, 0.0 %

Metacentric height 3.8

Remarks:
Hull space for machinery, storage & compartmentation is excellent
Room for accommodation & workspaces is cramped

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.15
Shellfire needed to sink: 14,311 lbs / 6,491 Kg = 58.6 x 7.9 " / 200 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 2.9
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 51 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.34
Relative quality as seaboat: 1.01

Hull form characteristics:
Block coefficient: 0.550
Sharpness coefficient: 0.41
Hull speed coefficient 'M': 6.12
'Natural speed' for length: 20.74 kts
Power going to wave formation at top speed: 48 %
Trim: 50
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 60.0 %
Relative accommodation and working space: 81.1 %
(Average = 100%)
Displacement factor: 126 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.96
(Structure weight / hull surface area: 139 lbs / square foot or 679 Kg / square metre)
Relative longitudinal hull strength: 1.42
(for 10.50 ft / 3.20 m average freeboard, freeboard adjustment -4.62 ft)
Relative composite hull strength: 1.00

Did make an error back then with armor thickness for the main and secondary turrets...

This is the current design for it which does have correct turret armor thickness:
Atatake, Japan Monitor laid down 1924

Displacement:
7,456 t light; 8,000 t standard; 9,197 t normal; 10,118 t full load
Loading submergence 547 tons/feet

Dimensions:
440.00 ft x 62.00 ft x 20.00 ft (normal load)
134.11 m x 18.90 m x 6.10 m

Armament:
4 - 7.87" / 200 mm guns (2 Main turrets x 2 guns, 2 superfiring turrets)
4 - 11.81" / 300 mm guns (2 2nd turrets x 2 guns)
12 - 1.97" / 50 mm AA guns
24 - 0.98" / 25 mm guns
Weight of broadside 4,329 lbs / 1,964 kg
8 - 24.0" / 609.6 mm above water torpedoes

Armour:
Belt 8.00" / 203 mm, ends unarmoured
Belts cover 65 % of normal area
Main turrets 8.00" / 203 mm, 2nd turrets 8.00" / 203 mm
AA gun shields 1.00" / 25 mm, Light gun shields 1.00" / 25 mm
Armour deck 3.30" / 84 mm, Conning tower 8.00" / 203 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 3 shafts, 15,097 shp / 11,262 Kw = 20.00 kts
Range 8,705nm at 15.00 kts

Complement:
469 - 610

Cost:
£2.427 million / $9.707 million

Distribution of weights at normal displacement:
Armament: 541 tons, 5.9 %
Armour: 2,807 tons, 30.5 %
Belts: 599 tons, 6.5 %, Armament: 963 tons, 10.5 %, Armour Deck: 1,170 tons, 12.7 %
Conning Tower: 76 tons, 0.8 %, Torpedo bulkhead: 0 tons, 0.0 %
Machinery: 497 tons, 5.4 %
Hull, fittings & equipment: 3,560 tons, 38.7 %
Fuel, ammunition & stores: 1,742 tons, 18.9 %
Miscellaneous weights: 50 tons, 0.5 %

Metacentric height 2.7

Remarks:
Hull space for machinery, storage & compartmentation is excellent
Room for accommodation & workspaces is cramped

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.05
Shellfire needed to sink: 12,030 lbs / 5,457 Kg = 49.3 x 7.9 " / 200 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 2.4
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 51 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.56
Relative quality as seaboat: 1.02

Hull form characteristics:
Block coefficient: 0.590
Sharpness coefficient: 0.40
Hull speed coefficient 'M': 6.42
'Natural speed' for length: 20.98 kts
Power going to wave formation at top speed: 46 %
Trim: 50
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 64.2 %
Relative accommodation and working space: 61.3 %
(Average = 100%)
Displacement factor: 112 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.98
(Structure weight / hull surface area: 134 lbs / square foot or 653 Kg / square metre)
Relative longitudinal hull strength: 1.26
(for 10.70 ft / 3.26 m average freeboard, freeboard adjustment -4.19 ft)
Relative composite hull strength: 1.00

Walter