As part of the process of learning how Springsharp works, I've tried to model a historical warship, a Soviet Type 7U destroyer of late 1930s vintage. I am certain I've goofed something in the sim appended below, but I figure the best way to learn is to invite comment.
Please let me know how I could improve.
Project 7A, TBD Destroyer laid down 1938
Displacement:
1,687 t light; 1,747 t standard; 2,039 t normal; 2,272 t full load
Dimensions: Length overall / water x beam x draught
371.64 ft / 361.00 ft x 33.50 ft x 12.50 ft (normal load)
113.28 m / 110.03 m x 10.21 m x 3.81 m
Armament:
4 - 4.72" / 120 mm guns in single mounts, 52.72lbs / 23.91kg shells, 1938 Model
Dual purpose guns in deck mounts
on centreline ends, evenly spread, all raised mounts - superfiring
4 - 1.57" / 40.0 mm guns in single mounts, 1.95lbs / 0.88kg shells, 1938 Model
Anti-aircraft guns in deck mounts
on centreline, all amidships, all raised mounts - superfiring
12 - 0.79" / 20.0 mm guns (1x12 guns), 0.24lbs / 0.11kg shells, 1938 Model
Anti-aircraft guns in deck mount
on side, all raised guns
Weight of broadside 222 lbs / 100 kg
Shells per gun, main battery: 150
5 - 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, 50,126 shp / 37,394 Kw = 34.00 kts
Range 4,000nm at 18.00 kts
Bunker at max displacement = 525 tons
Complement:
151 - 197
Cost:
£1.329 million / $5.317 million
Distribution of weights at normal displacement:
Armament: 28 tons, 1.4 %
Armour: 11 tons, 0.5 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 11 tons, 0.5 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 1,097 tons, 53.8 %
Hull, fittings & equipment: 552 tons, 27.1 %
Fuel, ammunition & stores: 352 tons, 17.3 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
512 lbs / 232 Kg = 9.7 x 4.7 " / 120 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.20
Metacentric height 1.4 ft / 0.4 m
Roll period: 12.1 seconds
Steadiness - As gun platform (Average = 50 %): 55 %
- Recoil effect (Restricted arc if above 1.00): 0.18
Seaboat quality (Average = 1.00): 0.55
Hull form characteristics:
Hull has low forecastle, rise aft of midbreak, raised quarterdeck
Block coefficient: 0.472
Length to Beam Ratio: 10.78 : 1
'Natural speed' for length: 19.00 kts
Power going to wave formation at top speed: 69 %
Trim (Max stability = 0, Max steadiness = 100): 100
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 3.00 ft / 0.91 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21.00 ft / 6.40 m
- Forecastle (10 %): 16.00 ft / 4.88 m (18.00 ft / 5.49 m aft of break)
- Mid (50 %): 8.00 ft / 2.44 m (9.00 ft / 2.74 m aft of break)
- Quarterdeck (15 %): 9.00 ft / 2.74 m (8.00 ft / 2.44 m before break)
- Stern: 8.00 ft / 2.44 m
- Average freeboard: 11.25 ft / 3.43 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 184.1 %
- Above water (accommodation/working, high = better): 77.3 %
Waterplane Area: 7,859 Square feet or 730 Square metres
Displacement factor (Displacement / loading): 68 %
Structure weight / hull surface area: 42 lbs/sq ft or 205 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.68
- Longitudinal: 0.98
- Overall: 0.71
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped
Caution: Lacks seaworthiness - very limited seakeeping ability
Armament - Four 120mm DP in single mounts; Four 40mm Bofors in twin mounts groups abaft funnel; Twelve 20mm Oerlikon in twin mounts.