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