WesWorld

License built Indian A-1/L-5 class motor launch. Armament changed to reflect Mexican weapons.



Azteca, Mexico Motor Launch laid down 1932

Displacement:
195 t light; 201 t standard; 219 t normal; 233 t full load

Dimensions: Length overall / water x beam x draught
136.02 ft / 132.00 ft x 19.00 ft x 6.50 ft (normal load)
41.46 m / 40.23 m x 5.79 m x 1.98 m

Armament:
1 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1932 Model
Dual purpose gun in deck mount
on centreline forward
1 - 1.85" / 47.0 mm guns in single mounts, 3.17lbs / 1.44kg shells, 1932 Model
Quick firing gun in deck mount
on centreline aft
2 - 0.79" / 20.0 mm guns (1x2 guns), 0.24lbs / 0.11kg shells, 1932 Model
Machine guns in deck mount
on centreline amidships
Weight of broadside 17 lbs / 8 kg
Shells per gun, main battery: 150

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.00" / 25 mm - -
2nd: 0.50" / 13 mm - -

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 1 shaft, 2,420 shp / 1,805 Kw = 20.00 kts
Range 2,000nm at 12.00 kts
Bunker at max displacement = 32 tons

Complement:
27 - 36

Cost:
£0.085 million / $0.339 million

Distribution of weights at normal displacement:
Armament: 2 tons, 1.0 %
Armour: 2 tons, 0.9 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 2 tons, 0.9 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 71 tons, 32.6 %
Hull, fittings & equipment: 103 tons, 47.0 %
Fuel, ammunition & stores: 24 tons, 10.8 %
Miscellaneous weights: 17 tons, 7.8 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
232 lbs / 105 Kg = 17.2 x 3.0 " / 76 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.12
Metacentric height 0.5 ft / 0.2 m
Roll period: 11.2 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.11
Seaboat quality (Average = 1.00): 1.26

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.470
Length to Beam Ratio: 6.95 : 1
'Natural speed' for length: 11.49 kts
Power going to wave formation at top speed: 72 %
Trim (Max stability = 0, Max steadiness = 100): 40
Bow angle (Positive = bow angles forward): 15.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 15.00 ft / 4.57 m
- Forecastle (20 %): 13.00 ft / 3.96 m
- Mid (50 %): 13.00 ft / 3.96 m (7.00 ft / 2.13 m aft of break)
- Quarterdeck (15 %): 7.00 ft / 2.13 m
- Stern: 7.00 ft / 2.13 m
- Average freeboard: 10.16 ft / 3.10 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 122.0 %
- Above water (accommodation/working, high = better): 107.2 %
Waterplane Area: 1,556 Square feet or 145 Square metres
Displacement factor (Displacement / loading): 122 %
Structure weight / hull surface area: 27 lbs/sq ft or 132 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.80
- Longitudinal: 11.91
- Overall: 1.05
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is adequate
Good seaboat, rides out heavy weather easily