Here is the finished design of the mail carrier Leonardo da Vinci. Will carry six FMA I.A.e 4 Courier twin-engined mailplanes in a hangar with single lift. Provision for hydlaic/compressed air catapult to be fitted later. Six arrester wires and two crash barriers.
Leonardo da Vinci, Argentina Express Mail Ship laid down 1933
Displacement:
11,490 t light; 11,752 t standard; 13,104 t normal; 14,185 t full load
Dimensions: Length overall / water x beam x draught
532.85 ft / 524.93 ft x 82.02 ft x 22.15 ft (normal load)
162.41 m / 160.00 m x 25.00 m x 6.75 m
Machinery:
Diesel Internal combustion generators,
Electric motors, 2 shafts, 40,510 shp / 30,221 Kw = 26.02 kts
Range 10,000nm at 15.00 kts
Bunker at max displacement = 2,433 tons
Complement:
612 - 796
Cost:
£2.682 million / $10.729 million
Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Machinery: 1,180 tons, 9.0 %
Hull, fittings & equipment: 4,310 tons, 32.9 %
Fuel, ammunition & stores: 1,614 tons, 12.3 %
Miscellaneous weights: 6,000 tons, 45.8 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
22,897 lbs / 10,386 Kg = 212.0 x 6 " / 152 mm shells or 2.7 torpedoes
Stability (Unstable if below 1.00): 1.08
Metacentric height 4.3 ft / 1.3 m
Roll period: 16.6 seconds
Steadiness - As gun platform (Average = 50 %): 60 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 1.82
Hull form characteristics:
Hull has raised forecastle
and transom stern
Block coefficient: 0.481
Length to Beam Ratio: 6.40 : 1
'Natural speed' for length: 27.25 kts
Power going to wave formation at top speed: 54 %
Trim (Max stability = 0, Max steadiness = 100): 33
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: 29.53 ft / 9.00 m
- Forecastle (18 %): 29.53 ft / 9.00 m (26.25 ft / 8.00 m aft of break)
- Mid (50 %): 26.25 ft / 8.00 m
- Quarterdeck (15 %): 26.25 ft / 8.00 m
- Stern: 26.25 ft / 8.00 m
- Average freeboard: 26.84 ft / 8.18 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 79.6 %
- Above water (accommodation/working, high = better): 239.5 %
Waterplane Area: 29,315 Square feet or 2,723 Square metres
Displacement factor (Displacement / loading): 157 %
Structure weight / hull surface area: 99 lbs/sq ft or 481 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.91
- Longitudinal: 2.43
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Excellent seaboat, comfortable, rides out heavy weather easily