Well here is my first attempt to make a conversion of an existing ship into another type of vessel. In this case, the damaged light cruiser Guardia Marina Hyatt will get rebuilt with a new engine (seeing that the old one seem to be missing pieces now) but into a seaplane cruiser. The original design is below this one.
I estimated 8 floatplanes for this ship, plus maybe a spare.
Guardia Marina Hyatt
Chilean Seaplane Cruiser laid down 1925 (Engine/Conversion 1927)
Displacement:
4,487 t light; 4,626 t standard; 5,150 t normal; 5,549 t full load
Dimensions: Length overall / water x beam x draught
392.00 ft / 385.00 ft x 48.10 ft x 16.25 ft (normal load)
119.48 m / 117.35 m x 14.66 m x 4.95 m
Armament:
4 - 5.90" / 150 mm guns (2x2 guns), 102.69lbs / 46.58kg shells, 1925 Model
Breech loading guns in deck mounts with hoists
on centreline, all forward, 1 raised mount - superfiring
8 - 1.46" / 37.0 mm guns in single mounts, 1.55lbs / 0.70kg shells, 1925 Model
Anti-aircraft guns in deck mounts
on side, all forward
8 - 0.50" / 12.7 mm guns (4x2 guns), 0.06lbs / 0.03kg shells, 1925 Model
Machine guns in deck mounts
on side, all amidships, all raised mounts - superfiring
Weight of broadside 424 lbs / 192 kg
Shells per gun, main battery: 150
8 floatplanes
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.50" / 13 mm - -
- Conning tower: 0.75" / 19 mm
Machinery:
Oil fired boilers, steam turbines,
Direct drive, 2 shafts, 50,000 shp / 37,300 Kw = 29.01 kts
Range 3,500nm at 18.00 kts (Bunkerage = 944 tons)
Complement:
303 - 395
Cost:
£1.383 million / $5.530 million
Distribution of weights at normal displacement:
Armament: 53 tons, 1.0 %
Armour: 11 tons, 0.2 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 6 tons, 0.1 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 5 tons, 0.1 %
Machinery: 1,578 tons, 30.6 %
Hull, fittings & equipment: 2,195 tons, 42.6 %
Fuel, ammunition & stores: 663 tons, 12.9 %
Miscellaneous weights: 650 tons, 12.6 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
4,490 lbs / 2,037 Kg = 43.7 x 5.9 " / 150 mm shells or 0.9 torpedoes
Stability (Unstable if below 1.00): 1.01
Metacentric height 1.7 ft / 0.5 m
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.39
Seaboat quality (Average = 1.00): 1.22
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.599
Length to Beam Ratio: 8.00 : 1
'Natural speed' for length: 19.62 kts
Power going to wave formation at top speed: 67 %
Trim (Max stability = 0, Max steadiness = 100): 58
Bow angle (Positive = bow angles forward): 10.12 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 28.00 ft / 8.53 m
- Forecastle (20 %): 22.00 ft / 6.71 m
- Mid (50 %): 21.00 ft / 6.40 m
- Quarterdeck (15 %): 20.00 ft / 6.10 m
- Stern: 20.00 ft / 6.10 m
- Average freeboard: 21.51 ft / 6.55 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 121.1 %
- Above water (accommodation/working, high = better): 174.4 %
Waterplane Area: 13,234 Square feet or 1,229 Square metres
Displacement factor (Displacement / loading): 121 %
Structure weight / hull surface area: 86 lbs/sq ft or 420 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.00
- Longitudinal: 4.85
- Overall: 1.17
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily
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(original vessel)
Guardia Marina Hyatt
Chilean Light Cruiser laid down 1925
Displacement:
4,195 t light; 4,364 t standard; 5,004 t normal; 5,496 t full load
Dimensions: Length overall / water x beam x draught
392.00 ft / 385.00 ft x 48.10 ft x 16.25 ft (normal load)
119.48 m / 117.35 m x 14.66 m x 4.95 m
Armament:
5 - 5.90" / 150 mm guns (4 mounts), 102.69lbs / 46.58kg shells, 1925 Model
Breech loading guns in deck mounts with hoists
on centreline ends, evenly spread, 2 raised mounts - superfiring
6 - 4.30" / 109 mm guns in single mounts, 39.75lbs / 18.03kg shells, 1925 Model
Quick firing guns in deck mounts
on side, evenly spread
6 - 1.46" / 37.0 mm guns in single mounts, 1.55lbs / 0.70kg shells, 1925 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
8 - 0.50" / 12.7 mm guns (4x2 guns), 0.06lbs / 0.03kg shells, 1925 Model
Machine guns in deck mounts
on side, all amidships, all raised mounts - superfiring
1 - 1.82" / 46.2 mm guns in single mounts, 3.00lbs / 1.36kg shells, 1925 Model
Breech loading gun in deck mount
on centreline forward, 1 raised gun
Weight of broadside 765 lbs / 347 kg
Shells per gun, main battery: 150
Armour:
- Armour deck: 1.00" / 25 mm, Conning tower: 6.00" / 152 mm
Machinery:
Oil fired boilers, steam turbines,
Direct drive, 2 shafts, 64,787 shp / 48,331 Kw = 31.00 kts
Range 7,000nm at 15.00 kts (Bunkerage = 1,152 tons)
Complement:
296 - 386
Cost:
£1.707 million / $6.828 million
Distribution of weights at normal displacement:
Armament: 96 tons, 1.9 %
Armour: 278 tons, 5.6 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 0 tons, 0.0 %
- Armour Deck: 240 tons, 4.8 %
- Conning Tower: 38 tons, 0.8 %
Machinery: 2,103 tons, 42.0 %
Hull, fittings & equipment: 1,667 tons, 33.3 %
Fuel, ammunition & stores: 809 tons, 16.2 %
Miscellaneous weights: 50 tons, 1.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
2,721 lbs / 1,234 Kg = 26.5 x 5.9 " / 150 mm shells or 0.6 torpedoes
Stability (Unstable if below 1.00): 1.24
Metacentric height 2.5 ft / 0.8 m
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.34
Seaboat quality (Average = 1.00): 1.11
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.582
Length to Beam Ratio: 8.00 : 1
'Natural speed' for length: 19.62 kts
Power going to wave formation at top speed: 70 %
Trim (Max stability = 0, Max steadiness = 100): 63
Bow angle (Positive = bow angles forward): 10.12 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 28.00 ft / 8.53 m
- Forecastle (20 %): 22.00 ft / 6.71 m
- Mid (50 %): 21.00 ft / 6.40 m
- Quarterdeck (15 %): 20.00 ft / 6.10 m
- Stern: 20.00 ft / 6.10 m
- Average freeboard: 21.51 ft / 6.55 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 151.8 %
- Above water (accommodation/working, high = better): 175.2 %
Waterplane Area: 12,988 Square feet or 1,207 Square metres
Displacement factor (Displacement / loading): 94 %
Structure weight / hull surface area: 66 lbs/sq ft or 322 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.75
- Longitudinal: 3.80
- Overall: 0.88
Caution: Hull subject to strain in open-sea
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform