WesWorld

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

I realize that Springstyle reckons it's possible but I have difficulty believing that you could fit all this stuff into a hull less than 400 feet long. Could I request a sketch of the layout, please?

Well essentially the bulk of the guns would be on the forward section (two twin mounts), and the aircraft facility's aft.

The British Pegasus was armed with 4x12 pdr on a 330/43/15 hull, while the Hyatt is 50 feet longer.

A sketch would help though.

This is rough I suppose, as I'm not sure what type of floatplanes I'm using at the moment. I also lack knowledge on a few points about floatplane storage for seaplane carriers....I simply used the hull and beam conversion for SS, which would give a ship this size 18 airplanes, since I'm using less than half the ship but have added more internal space, I figured 8 planes might fit with one in storage. It might end up being more than one in storage, but I'd still like at least 8 planes (folded, in crates, or fully built) if possible.

As Completed Vessel:


Proposed Rebuilt Vessel:

Same class as the Swedish Cruiser Gotland http://www.hazegray.org/navhist/carriers/sweden.htm

8 planes would seem to be OK.

Cheers,

Definitly an interesting and logical conversion.

Could I interest you in some nice little Floatplane fighters, 2 seaters, folding wings and all!!

Check out the danish enteries in the aircraft section!

Thank you.

I'm wondering if I already have some British floatplanes in my air forces. I'll need to look some things up before I start trying to acquire more planes.

Personally I think overall she looks good allthough I'd shrink the hangar down a bit but thats my own opinion. Doubling up those light AA guns wouldn't hurt either. It would certainly give you more deck space.

Quoted

I'm wondering if I already have some British floatplanes in my air forces. I'll need to look some things up before I start trying to acquire more planes

IIRC the Chilean Navy received about 50 (or 20?) aircraft as part of the deal to transfer HMS Canada back to Chile after WW1. This made the Chilean Naval airforce the largest in South America.

Cheers,

Rememer, tho, that here the Chilean DNs were built in Nordmark...

He's right Jim, that blasted, green blooded, inhuman.....

Would that mean I'd have Nordmark planes then?