WesWorld

how to push a cruiser class ship over 35 knots and keep it stable? I only ask because as a former member of the United states Navy I served on a Guided missle cruiser. and when i use its exact demensions and weights it is unstable at any speed whereas i know it made 40 knots in trials and was rated as stable to 36.

Are you refering to the Long Beach?

Did you add a transom stern? Fiddle with the Block Co-efficient as well. Reguardless SS is designed for pre 1950 ships, there is no Nuclear powerplant available in the engine settings slot.

Also no gas turbines like they use now. from what I understand the new engines are what allow more modern warships keep up with the Nuclear carriers, and finally negated Enterprise's serious acceleration advantage.

For the last 13,000 tons of the Dutch Cruiser allocation I had considered a very fast heavy cruiser- 34-35 knots, that I could use as a CL leader and create mismatches.

Playing with pushing that design to 36kts, it works...kinda. You either have to accept poor seakeeping or raise the freeboard an awful lot for all of these. I've played with high speed ships before, but generally they are not worth it.

Stability wise, removing the deck or belt armor has a negative effect on stability dropping it from 1.11 to 1.08, likewise unselecting the engine- all these things are waterline or below and help keep the ship stable.

Likewise superimposed guns impose a stability penalty- the difference between 4x2 (with 2 superimposed) and 2x4 is a further .05 stability and .04 comp hull.

The high freeboard needed for good seakeeping can also harm you- just resetting to the default was worth 0.1 stabilty (and .14 comp hull) .

To ensure that it's not a comp hull issue- I added the surplus to the deck armor, bringing comp hull back to 1.00 and adding .01 stability.

The South African light cruisers of the Arion-Class , laid down 1927 and weighting 6000ts, are good for 35,5kn and kept a stability of 1,16 while their seakeeping remained 1,00.

To achive this a l:b ratio of slightly over 10, a transome stern and a bc or less than 0,5 were necessary.

And of course the ships armor is hardly suffice to keep cruiser shells out of her vitals as protection is calculated against DD gun fire at best.

Anyway, the class shows a medium sized warship with a speed of 35+kn can be simed with SSv2,01.

The speed given by SS is the speed at normal load. On trials, typically less fuel load is present resulting in a smaller draught, lower displacement and less drag.

Altering the trim will enable you to get a higher stability value. IIRC, SS uses a simple stability calculation something like;

Roll period = k * metacentric height, and uses an average (typical) value for k

Gas Turbine Engines are good for acceleration and producing large amounts of power from a very small space. They can be run up to full power in a very short period of time unlike Steam Plants. The Marine Trent 30 series gives you about 50,000hp from something that weighs 22tons.

ya i was on a gass turbin ship. Big E is the most Over Powerd ship in the fleet though lol. the only reason i wonderd though is i have bene trying to pull 35+ knots out of a 11" gun armord cruiser. best i can get is 1.0 stability at 30 knots though >< although she is a decent little boat.

XS-36, Heavy Cruiser laid down 1936

Displacement:
10,992 t light; 11,660 t standard; 13,000 t normal; 14,072 t full load

Dimensions: Length overall / water x beam x draught
606.73 ft / 600.00 ft x 61.65 ft (Bulges 71.65 ft) x 22.00 ft (normal load)
184.93 m / 182.88 m x 18.79 m (Bulges 21.84 m) x 6.71 m

Armament:
6 - 11.00" / 279 mm guns (2x3 guns), 665.50lbs / 301.87kg shells, 1936 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread
12 - 5.00" / 127 mm guns (6x2 guns), 62.50lbs / 28.35kg shells, 1936 Model
Dual purpose guns in deck mounts with hoists
on side, all amidships, 2 raised mounts - superfiring
32 - 0.50" / 12.7 mm guns (8x4 guns), 0.06lbs / 0.03kg shells, 1936 Model
Machine guns in deck mounts
on side ends, evenly spread, 2 raised mounts - superfiring
16 - 0.50" / 12.7 mm guns (4x4 guns), 0.06lbs / 0.03kg shells, 1936 Model
Breech loading guns in deck mounts
on side, all amidships
Weight of broadside 4,746 lbs / 2,153 kg
Shells per gun, main battery: 150

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 5.00" / 127 mm 390.00 ft / 118.87 m 9.42 ft / 2.87 m
Ends: Unarmoured
Main Belt covers 100 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 6.00" / 152 mm 2.00" / 51 mm 6.00" / 152 mm
2nd: 2.00" / 51 mm 1.00" / 25 mm -
3rd: 0.50" / 13 mm - -
4th: 0.50" / 13 mm - -

- Armour deck: 4.00" / 102 mm, Conning tower: 2.00" / 51 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 4 shafts, 66,538 shp / 49,638 Kw = 30.00 kts
Range 10,000nm at 15.00 kts
Bunker at max displacement = 2,411 tons

Complement:
608 - 791

Cost:
£6.034 million / $24.137 million

Distribution of weights at normal displacement:
Armament: 593 tons, 4.6 %
Armour: 3,136 tons, 24.1 %
- Belts: 766 tons, 5.9 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 483 tons, 3.7 %
- Armour Deck: 1,864 tons, 14.3 %
- Conning Tower: 24 tons, 0.2 %
Machinery: 1,867 tons, 14.4 %
Hull, fittings & equipment: 5,352 tons, 41.2 %
Fuel, ammunition & stores: 2,008 tons, 15.4 %
Miscellaneous weights: 43 tons, 0.3 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
16,110 lbs / 7,307 Kg = 24.2 x 11.0 " / 279 mm shells or 2.3 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 3.0 ft / 0.9 m
Roll period: 17.4 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.62
Seaboat quality (Average = 1.00): 1.07

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.481
Length to Beam Ratio: 8.37 : 1
'Natural speed' for length: 28.43 kts
Power going to wave formation at top speed: 54 %
Trim (Max stability = 0, Max steadiness = 100): 65
Bow angle (Positive = bow angles forward): 9.00 degrees
Stern overhang: 2.46 ft / 0.75 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 26.94 ft / 8.21 m
- Forecastle (18 %): 17.15 ft / 5.23 m
- Mid (50 %): 17.15 ft / 5.23 m
- Quarterdeck (18 %): 17.15 ft / 5.23 m
- Stern: 17.15 ft / 5.23 m
- Average freeboard: 17.84 ft / 5.44 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 82.7 %
- Above water (accommodation/working, high = better): 135.3 %
Waterplane Area: 25,187 Square feet or 2,340 Square metres
Displacement factor (Displacement / loading): 111 %
Structure weight / hull surface area: 134 lbs/sq ft or 653 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.96
- Longitudinal: 1.35
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform