WesWorld

A class of 3 that i had not posted the details of before. Panthera, Leone y Tigre were thought more of as destroyer leaders than cruisers when they were laid down.



Panthera Class, Italian Scout Cruiser laid down 1917

Displacement:
2,488 t light; 2,575 t standard; 2,696 t normal; 2,781 t full load
Loading submergence 242 tons/feet

Dimensions:
393.70 ft x 39.70 ft x 15.09 ft (normal load)
120.00 m x 12.10 m x 4.60 m

Armament:
6 - 5.12" / 130 mm guns
2 - 0.54" / 14 mm guns
Weight of broadside 402 lbs / 183 kg
6 - 21.0" / 533.4 mm above water torpedoes

Armour:
Main gun shields 0.79" / 20 mm
Conning tower 2.95" / 75 mm

Machinery:
Oil fired boilers, steam turbines,
Direct drive, 2 shafts, 55,247 shp / 41,214 Kw = 34.00 kts
Range 4,000nm at 10.00 kts

Complement:
187 - 243

Cost:
£0.642 million / $2.570 million

Distribution of weights at normal displacement:
Armament: 50 tons, 1.9 %
Armour: 21 tons, 0.8 %
Belts: 0 tons, 0.0 %, Armament: 8 tons, 0.3 %, Armour Deck: 0 tons, 0.0 %
Conning Tower: 12 tons, 0.5 %, Torpedo bulkhead: 0 tons, 0.0 %
Machinery: 1,600 tons, 59.4 %
Hull, fittings & equipment: 797 tons, 29.6 %
Fuel, ammunition & stores: 208 tons, 7.7 %
Miscellaneous weights: 20 tons, 0.7 %

Metacentric height 2.0

Remarks:
Caution: Hull subject to strain in open-sea
Hull space for machinery, storage & compartmentation is extremely poor
Room for accommodation & workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.30
Shellfire needed to sink: 575 lbs / 261 Kg = 8.6 x 5.1 " / 130 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 0.3
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 71 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.22
Relative quality as seaboat: 1.06

Hull form characteristics:
Block coefficient: 0.400
Sharpness coefficient: 0.30
Hull speed coefficient 'M': 8.65
'Natural speed' for length: 19.84 kts
Power going to wave formation at top speed: 65 %
Trim: 67
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 206.4 %
Relative accommodation and working space: 104.0 %
(Average = 100%)
Displacement factor: 60 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.59
(Structure weight / hull surface area: 47 lbs / square foot or 231 Kg / square metre)
Relative longitudinal hull strength: 1.48
(for 16.40 ft / 5.00 m average freeboard, freeboard adjustment 4.75 ft)
Relative composite hull strength: 0.65

Quoted

Originally posted by Red Admiral
Armour:
Main gun shields 20.00" / 508 mm

!!!!!!!!!!!!!!!!!

????????????

Red Admiral seems to have hired someof my recently discharged designers. *g*

It should read 2". Strangely there are no stability problems as well...

Quoted

It should read 2". Strangely there are no stability problems as well...

I might be wrong, but it looks like you use metric for your armor and not imperial, so shouldn't it be 20mm?

Also, this is what I get when I enter the data of your ship:

Panthera, Italian Light Cruiser laid down 1917

Displacement:
3,515 t light; 3,632 t standard; 3,856 t normal; 4,019 t full load
Loading submergence 333 tons/feet

Dimensions:
444.40 ft x 44.30 ft x 15.00 ft (normal load)
135.45 m x 13.50 m x 4.57 m

Armament:
8 - 4.72" / 120 mm guns
4 - 3.00" / 76 mm AA guns
Weight of broadside 476 lbs / 216 kg
2 - 21.0" / 533.4 mm above water torpedoes

Armour:
Main gun shields 0.79" / 20 mm
Conning tower 2.95" / 75 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 42,621 shp / 31,795 Kw = 30.50 kts
Range 6,000nm at 10.00 kts

Complement:
244 - 318

Cost:
£0.712 million / $2.849 million

Distribution of weights at normal displacement:
Armament: 59 tons, 1.5 %
Armour: 26 tons, 0.7 %
Belts: 0 tons, 0.0 %, Armament: 10 tons, 0.3 %, Armour Deck: 0 tons, 0.0 %
Conning Tower: 16 tons, 0.4 %, Torpedo bulkhead: 0 tons, 0.0 %
Machinery: 1,562 tons, 40.5 %
Hull, fittings & equipment: 1,868 tons, 48.4 %
Fuel, ammunition & stores: 340 tons, 8.8 %
Miscellaneous weights: 0 tons, 0.0 %

Metacentric height 2.0

Remarks:
Hull space for machinery, storage & compartmentation is cramped
Room for accommodation & workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.19
Shellfire needed to sink: 2,495 lbs / 1,131 Kg = 47.3 x 4.7 " / 120 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 0.6
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 70 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.18
Relative quality as seaboat: 1.15

Hull form characteristics:
Block coefficient: 0.457
Sharpness coefficient: 0.32
Hull speed coefficient 'M': 8.66
'Natural speed' for length: 21.08 kts
Power going to wave formation at top speed: 59 %
Trim: 61
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 143.0 %
Relative accommodation and working space: 139.6 %
(Average = 100%)
Displacement factor: 106 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 1.16
(Structure weight / hull surface area: 90 lbs / square foot or 438 Kg / square metre)
Relative longitudinal hull strength: 1.97
(for 16.50 ft / 5.03 m average freeboard, freeboard adjustment 3.98 ft)
Relative composite hull strength: 1.22


Walter

Yes i do use metric for armour, so it should be 20mm. HHHmmm strange error...

Well, I've recently noticed that that error occurs when you use metric for your armor thickness and when you start messing around with number of turrets. If you go for 4 two gun turrets and then change it back to no turrets, then (for some unknown reason) the weight given for the 20mm thick shields is actually the armor thickness for 20 inches of the shield. While it still says 20mm on the "Torpedoes & Armour" screen, the thickness given in the report is 20 inches.
Not sure if this is a known error in SS.
With the latest Springsharp version coming up, I think it is a good opportunity for those of the Wesworld who vollunteered to become a tester for the program to find out if that error is still in there in the latest version.

To get this:
1) Create a ship.
2) Use metric for armor.
3) Enter a number of turrets for your main armament.
4) After having entered turret thickness, go back to "Armament" screen and change the number of turrets to zero.
5) Same happens with the secondaries.
6) It also happens when you change the number of turrets a few times.
7) I tried it out with the design of my BC the Kamatari (normal displacement = 37,588 tons). Initially, you do not get this problem when changing the number of turrets to zero, but I found out that when you remove the superfiring turrets first and then reduce the number of turrets to zero, you do not get that problem (although changing it back to 2 superfiring turrets and 4 turrets will give you that error), but if you change the number of turrets to zero first before removing the superfiring turrets, you will also get that problem.

How to avoid it:
1) Use imperial.
2) Do not change the number of turrets.
3) If you do change the number of turrets, reenter armor data for the main and/or secondary turrets.
4) Always check your SS report for any errors.

Walter