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21

Sunday, July 31st 2011, 9:35pm

Quoted

Originally posted by Daidalos
Thanks so far, I will modify this design again... but with the range....whatfor do i need 4000 nm range for a ship which most likely will never leave the baltic see?


Brock has already mentioned the practical reason for increasing the fuel reserve - longer legs at high speed - but it has the design benefit of putting more mass below the waterline, which can help stability in certain situations. It may also result in a lower light tonnage.

22

Sunday, July 31st 2011, 11:17pm

Wroclaw IV Class, Poland Destroyer laid down 1941

Displacement:
2.326 t light; 2.429 t standard; 2.679 t normal; 2.878 t full load

Dimensions: Length overall / water x beam x draught
386,08 ft / 377,72 ft x 40,03 ft x 14,76 ft (normal load)
117,68 m / 115,13 m x 12,20 m x 4,50 m

Armament:
8 - 3,94" / 100 mm guns (4x2 guns), 30,51lbs / 13,84kg shells, 1941 Model
Dual purpose guns in deck mounts
on centreline ends, evenly spread, 2 raised mounts - superfiring
14 - 0,79" / 20,0 mm guns (7x2 guns), 0,24lbs / 0,11kg shells, 1941 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
2 - 0,50" / 12,7 mm guns in single mounts, 0,06lbs / 0,03kg shells, 1941 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 248 lbs / 112 kg
Shells per gun, main battery: 350
8 - 20,9" / 530 mm above water torpedoes

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0,87" / 22 mm 0,71" / 18 mm -
2nd: 0,39" / 10 mm - -

- Conning tower: 0,87" / 22 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 45.563 shp / 33.990 Kw = 33,65 kts
Range 5.000nm at 15,00 kts
Bunker at max displacement = 450 tons

Complement:
186 - 242

Cost:
£1,698 million / $6,791 million

Distribution of weights at normal displacement:
Armament: 31 tons, 1,2%
Armour: 20 tons, 0,7%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 16 tons, 0,6%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 4 tons, 0,1%
Machinery: 1.194 tons, 44,6%
Hull, fittings & equipment: 1.031 tons, 38,5%
Fuel, ammunition & stores: 352 tons, 13,2%
Miscellaneous weights: 50 tons, 1,9%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1.480 lbs / 671 Kg = 48,5 x 3,9 " / 100 mm shells or 0,5 torpedoes
Stability (Unstable if below 1.00): 1,23
Metacentric height 1,9 ft / 0,6 m
Roll period: 12,3 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0,18
Seaboat quality (Average = 1.00): 1,19

Hull form characteristics:
Hull has low quarterdeck
and transom stern
Block coefficient: 0,420
Length to Beam Ratio: 9,44 : 1
'Natural speed' for length: 22,52 kts
Power going to wave formation at top speed: 67 %
Trim (Max stability = 0, Max steadiness = 100): 59
Bow angle (Positive = bow angles forward): 20,00 degrees
Stern overhang: 0,00 ft / 0,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 22,97 ft / 7,00 m
- Forecastle (20%): 19,03 ft / 5,80 m
- Mid (40%): 19,03 ft / 5,80 m
- Quarterdeck (15%): 11,81 ft / 3,60 m (19,03 ft / 5,80 m before break)
- Stern: 11,81 ft / 3,60 m
- Average freeboard: 18,26 ft / 5,57 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 156,2%
- Above water (accommodation/working, high = better): 122,0%
Waterplane Area: 9.785 Square feet or 909 Square metres
Displacement factor (Displacement / loading): 98%
Structure weight / hull surface area: 52 lbs/sq ft or 253 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,69
- Longitudinal: 3,59
- Overall: 0,81
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform

23

Sunday, July 31st 2011, 11:29pm

Ah, looking good!

Few more nitpics. I would add hoists to your 100mm guns. That will keep there ammo coming at a nice and steady rate. Once you add the hoists, I would give them some light armor for splinter protection. Then, since you may still have some cross-sectional strenght left put it into speed, as I think your seekeeping can take it.

Looking very good, keep up the great work!
You smug-faced crowds with kindling eye
Who cheer when soldier lads march by,
Sneak home and pray you'll never know
The hell where youth and laughter go.
-Siegfried Sassoon

24

Sunday, July 31st 2011, 11:32pm

I would have to agree with Snip. Select the mount and hoist option.

As you see the increase in bloc coefficient certainly helped the stability issues, together with the increased bunkers. Excellent progress.

25

Monday, August 1st 2011, 12:23am

Thanks for your help and recommendations so far....but I think i need your help once more. I started to make a drwaing of the ship and....well I stopped the drawing because it looks kinda wierd....the freeboard looks way to big for me.
What do you think?



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26

Monday, August 1st 2011, 12:37am

The shear does look to be a bit much. Try lowering it in the SS file and see what it does to seakeeping
You smug-faced crowds with kindling eye
Who cheer when soldier lads march by,
Sneak home and pray you'll never know
The hell where youth and laughter go.
-Siegfried Sassoon