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.

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.

Modify the range from 4,000nm at 18.00 kts to either 4,000nm at 15.00 kts or 2,500nm at 18.00 kts to improve stability.

You'll also need more than the SS default of 150 shells per gun, you'll expend that number of shells rather quickly in a fight. Lets say at 10 rounds per minute firing rate you'll have just 15 minutes worth of ammo.

Finnaly you'll need Misc weight for depth charges, torpedo reloads, radar, sonar ect. but this last bit can wait untill you've familiarized yourself with Springsharp.

Thank you. I didn't even try the miscellaneous weights, as I don't have a clue as to normal ballpark figures.

I am very concerned with the freeboard and breaks in the hull - I'm certain the numbers are off. But I will see what adjusting the bunkers and magazines will accomplish and report back.

I am very concerned with the freeboard and breaks in the hull - I'm certain the numbers are off. But I will see what adjusting the bunkers and magazines will accomplish and report back.

I think I am still way off the mark.

Project 7A, TBD Destroyer laid down 1938 (Rev A – Revised Bunkers and Magazines)

Displacement:

1,745 t light; 1,850 t standard; 2,039 t normal; 2,189 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: 500

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 15.00 kts

Bunker at max displacement = 339 tons

Complement:

151 - 197

Cost:

£1.341 million / $5.364 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: 610 tons, 29.9 %

Fuel, ammunition & stores: 293 tons, 14.4 %

Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:

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

540 lbs / 245 Kg = 10.2 x 4.7 " / 120 mm shells or 0.3 torpedoes

Stability (Unstable if below 1.00): 1.14

Metacentric height 1.2 ft / 0.4 m

Roll period: 12.6 seconds

Steadiness - As gun platform (Average = 50 %): 54 %

- Recoil effect (Restricted arc if above 1.00): 0.19

Seaboat quality (Average = 1.00): 0.54

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): 186.4 %

- 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: 46 lbs/sq ft or 227 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 0.75

- Longitudinal: 1.09

- Overall: 0.78

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.

Project 7A, TBD Destroyer laid down 1938 (Rev A – Revised Bunkers and Magazines)

Displacement:

1,745 t light; 1,850 t standard; 2,039 t normal; 2,189 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: 500

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 15.00 kts

Bunker at max displacement = 339 tons

Complement:

151 - 197

Cost:

£1.341 million / $5.364 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: 610 tons, 29.9 %

Fuel, ammunition & stores: 293 tons, 14.4 %

Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:

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

540 lbs / 245 Kg = 10.2 x 4.7 " / 120 mm shells or 0.3 torpedoes

Stability (Unstable if below 1.00): 1.14

Metacentric height 1.2 ft / 0.4 m

Roll period: 12.6 seconds

Steadiness - As gun platform (Average = 50 %): 54 %

- Recoil effect (Restricted arc if above 1.00): 0.19

Seaboat quality (Average = 1.00): 0.54

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): 186.4 %

- 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: 46 lbs/sq ft or 227 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 0.75

- Longitudinal: 1.09

- Overall: 0.78

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.

## Quoted

Originally posted by HoOmAn

Sea boat rating is an issue too....

Springsharp has some problems with small and fast hulls. To learn the "how to" it might be easier to start with some common cruiser design.

However, for a first feeble design I´ve seen worse. ;o)

Thank you, I'll try that.

BTW, should questions like this be placed here or in the "Non Wesworld" section?

You've also got a rather odd deckline with the high stem dropping to the forecastle, then rising and dropping and rising again. Flush deck designs are easier to start out with, IMO.

The seakeeping being terrible is a function of the ship's speed and that you're not using all the strength you have available under WW rules. For a ship of this size and speed, under WW design guidelines (because SS2 has issues in this size range), we allow ships to be legal if they have cross-sectional and overall strengths that are both higher than 0.50.

Also, by this point, the 4.7'' guns should be in hoists. Otherwise, the ROF will suffer.

Also, if those 20 mm's are in twin mounts, you should have 6 mounts listed, not just one...just a minor qualm.

*Wednesday, July 18th 2018, 12:28pm*- Go to the top of the page

Forum Software: **Burning Board® Lite 2.1.2 pl 1**, developed by **WoltLab® GmbH**