WesWorld

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

Not bad. Not sure if the Mexicans would be able to afford it (realistically), having just paid for a battleship rebuild and a pair of CLs...

I finally got around to drawing her. What do you think?

Size of seaplane compared to destroyer.

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

Does the 1.1" machine gun exist yet?

The aircraft (Vought O2U) is at the correct scale compared to the ship.

If there's something I cant draw its the hull form.

The 1.1" gun was introduced in the 1929 Farragut class destroyers.

With the two turrets forward the the raised forecastle it would seem that there would be the possibility of overload forward.
Why not place the two turrets aft, and a single forward. That would seem to be a better distribution of weight.

Gavin's correct about the scale; at the 1 pixel = 1 foot scale you've used, the O2U should be 33 pixels long; it's only 23 pixels in the drawing.

It could probably use a float in place of the wheels, but that's a matter of operating doctrine, I suppose.

Vought O2U specs: 28'x36', so mine is a tad small. But it will still fit. Yeah I know the one in the pic doesnt have a float, thats because I copied it from a carrier and havent bothered drawing it in.

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