Even if I dont take over Mexico, I still feel the Mexican navy needs a major upgrade.

Here is a gunboat design based on the American Tillmans. Carries one floatplane.

General Alvaro Obregon, Mexico Gunboat laid down 1930

Displacement:

1,471 t light; 1,540 t standard; 1,872 t normal; 2,138 t full load

Dimensions: Length overall / water x beam x draught

320.00 ft / 320.00 ft x 35.00 ft x 13.00 ft (normal load)

97.54 m / 97.54 m x 10.67 m x 3.96 m

Armament:

6 - 5.00" / 127 mm guns (3x2 guns), 62.50lbs / 28.35kg shells, 1930 Model

Dual purpose guns in deck mounts with hoists

on centreline ends, majority forward, 1 raised mount - superfiring

4 - 1.10" / 27.9 mm guns (1x4 guns), 0.67lbs / 0.30kg shells, 1930 Model

Anti-aircraft guns in deck mount

on centreline amidships, all raised guns - superfiring

Weight of broadside 378 lbs / 171 kg

Shells per gun, main battery: 150

4 - 21.0" / 533.4 mm above water torpedoes

Armour:

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)

Main: 1.00" / 25 mm - -

Machinery:

Oil fired boilers, steam turbines,

Geared drive, 2 shafts, 14,084 shp / 10,507 Kw = 25.00 kts

Range 7,000nm at 15.00 kts

Bunker at max displacement = 598 tons

Complement:

141 - 184

Cost:

£0.631 million / $2.524 million

Distribution of weights at normal displacement:

Armament: 47 tons, 2.5 %

Armour: 14 tons, 0.8 %

- Belts: 0 tons, 0.0 %

- Torpedo bulkhead: 0 tons, 0.0 %

- Armament: 14 tons, 0.8 %

- Armour Deck: 0 tons, 0.0 %

- Conning Tower: 0 tons, 0.0 %

Machinery: 427 tons, 22.8 %

Hull, fittings & equipment: 882 tons, 47.1 %

Fuel, ammunition & stores: 401 tons, 21.4 %

Miscellaneous weights: 100 tons, 5.3 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship):

2,676 lbs / 1,214 Kg = 42.8 x 5.0 " / 127 mm shells or 0.8 torpedoes

Stability (Unstable if below 1.00): 1.14

Metacentric height 1.3 ft / 0.4 m

Roll period: 12.8 seconds

Steadiness - As gun platform (Average = 50 %): 70 %

- Recoil effect (Restricted arc if above 1.00): 0.77

Seaboat quality (Average = 1.00): 1.71

Hull form characteristics:

Hull has a flush deck

Block coefficient: 0.450

Length to Beam Ratio: 9.14 : 1

'Natural speed' for length: 17.89 kts

Power going to wave formation at top speed: 58 %

Trim (Max stability = 0, Max steadiness = 100): 41

Bow angle (Positive = bow angles forward): 0.00 degrees

Stern overhang: 0.00 ft / 0.00 m

Freeboard (% = measuring location as a percentage of overall length):

- Stem: 19.00 ft / 5.79 m

- Forecastle (15 %): 17.00 ft / 5.18 m

- Mid (40 %): 15.00 ft / 4.57 m

- Quarterdeck (11 %): 15.00 ft / 4.57 m

- Stern: 15.00 ft / 4.57 m

- Average freeboard: 15.67 ft / 4.78 m

Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 99.5 %

- Above water (accommodation/working, high = better): 111.6 %

Waterplane Area: 7,144 Square feet or 664 Square metres

Displacement factor (Displacement / loading): 139 %

Structure weight / hull surface area: 60 lbs/sq ft or 295 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 0.85

- Longitudinal: 4.21

- Overall: 1.00

Hull space for machinery, storage, compartmentation is adequate

Room for accommodation and workspaces is adequate

Ship has slow, easy roll, a good, steady gun platform

Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Here is a gunboat design based on the American Tillmans. Carries one floatplane.

General Alvaro Obregon, Mexico Gunboat laid down 1930

Displacement:

1,471 t light; 1,540 t standard; 1,872 t normal; 2,138 t full load

Dimensions: Length overall / water x beam x draught

320.00 ft / 320.00 ft x 35.00 ft x 13.00 ft (normal load)

97.54 m / 97.54 m x 10.67 m x 3.96 m

Armament:

6 - 5.00" / 127 mm guns (3x2 guns), 62.50lbs / 28.35kg shells, 1930 Model

Dual purpose guns in deck mounts with hoists

on centreline ends, majority forward, 1 raised mount - superfiring

4 - 1.10" / 27.9 mm guns (1x4 guns), 0.67lbs / 0.30kg shells, 1930 Model

Anti-aircraft guns in deck mount

on centreline amidships, all raised guns - superfiring

Weight of broadside 378 lbs / 171 kg

Shells per gun, main battery: 150

4 - 21.0" / 533.4 mm above water torpedoes

Armour:

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)

Main: 1.00" / 25 mm - -

Machinery:

Oil fired boilers, steam turbines,

Geared drive, 2 shafts, 14,084 shp / 10,507 Kw = 25.00 kts

Range 7,000nm at 15.00 kts

Bunker at max displacement = 598 tons

Complement:

141 - 184

Cost:

£0.631 million / $2.524 million

Distribution of weights at normal displacement:

Armament: 47 tons, 2.5 %

Armour: 14 tons, 0.8 %

- Belts: 0 tons, 0.0 %

- Torpedo bulkhead: 0 tons, 0.0 %

- Armament: 14 tons, 0.8 %

- Armour Deck: 0 tons, 0.0 %

- Conning Tower: 0 tons, 0.0 %

Machinery: 427 tons, 22.8 %

Hull, fittings & equipment: 882 tons, 47.1 %

Fuel, ammunition & stores: 401 tons, 21.4 %

Miscellaneous weights: 100 tons, 5.3 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship):

2,676 lbs / 1,214 Kg = 42.8 x 5.0 " / 127 mm shells or 0.8 torpedoes

Stability (Unstable if below 1.00): 1.14

Metacentric height 1.3 ft / 0.4 m

Roll period: 12.8 seconds

Steadiness - As gun platform (Average = 50 %): 70 %

- Recoil effect (Restricted arc if above 1.00): 0.77

Seaboat quality (Average = 1.00): 1.71

Hull form characteristics:

Hull has a flush deck

Block coefficient: 0.450

Length to Beam Ratio: 9.14 : 1

'Natural speed' for length: 17.89 kts

Power going to wave formation at top speed: 58 %

Trim (Max stability = 0, Max steadiness = 100): 41

Bow angle (Positive = bow angles forward): 0.00 degrees

Stern overhang: 0.00 ft / 0.00 m

Freeboard (% = measuring location as a percentage of overall length):

- Stem: 19.00 ft / 5.79 m

- Forecastle (15 %): 17.00 ft / 5.18 m

- Mid (40 %): 15.00 ft / 4.57 m

- Quarterdeck (11 %): 15.00 ft / 4.57 m

- Stern: 15.00 ft / 4.57 m

- Average freeboard: 15.67 ft / 4.78 m

Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 99.5 %

- Above water (accommodation/working, high = better): 111.6 %

Waterplane Area: 7,144 Square feet or 664 Square metres

Displacement factor (Displacement / loading): 139 %

Structure weight / hull surface area: 60 lbs/sq ft or 295 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 0.85

- Longitudinal: 4.21

- Overall: 1.00

Hull space for machinery, storage, compartmentation is adequate

Room for accommodation and workspaces is adequate

Ship has slow, easy roll, a good, steady gun platform

Excellent seaboat, comfortable, can fire her guns in the heaviest weather

The hull form is looking way too fat for Cb of 0.450

Does the 1.1" machine gun exist yet?

CanisD's Tillman scouts had two turrents foward and no aft. And I need the space aft for the plane + torpedoes.

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