Persian Destroyer 1916

[maddox]

Keep the bunkerage, and increse cruise speed to top speed, diminishing the range. Don't be surprised that you get a harbor DD.

Other thing.  In this posting you find a calculator.
Run the numbers trough and get the trial speed of your DD.

Coincidently, a very usefull posting concerning ins and outs of Shipbuilding in the Nverse.

[Borys]

IMO 1200nm is enough, for a boat this size.

Borys

[P3D]

IMO 1200nm is enough, for a boat this size.

Borys

You mean, one-third the range of historical classes should be considered enough? I don't think so.

[hooper82]

It'd be fine for a Coastal destroyer.  Not so much for a fleet destroyer.
Without a lot of logistical support anyway.

[Korpen]

It'd be fine for a Coastal destroyer.  Not so much for a fleet destroyer.
Without a lot of logistical support anyway.

The problem with the short range is that it does not allow the destroyer to conduct any form of patrols. It has a range of only 180nm at top speed, or a bit over 6h. In any form of engagement one can expect a need for at lest 3h at maximum power, most likely more. The low range means that the ship do not have any ability to stay at a sea-station for more then a few hours under the best of conditions, not at all under most.
If you increase range by 100% you get a ship that can actually assist in finding an enemy, and not only in a sortie against a target other ships have identified.
And yes, her sea keeping is hugely excessive. 

[helgi]

Version 5. Hope, final ;D

DD1, Persia destroyer laid down 1916

Displacement:
   750 t light; 780 t standard; 860 t normal; 924 t full load

Dimensions: Length overall / water x beam x draught
   303,01 ft / 302,46 ft x 26,57 ft x 9,84 ft (normal load)
   92,36 m / 92,19 m x 8,10 m  x 3,00 m

Armament:
      2 - 4,13" / 105 mm guns in single mounts, 35,32lbs / 16,02kg shells, 1908 Model
     Quick firing guns in deck mounts
     on centreline, all forward
      2 - 4,13" / 105 mm guns in single mounts, 35,32lbs / 16,02kg shells, 1908 Model
     Quick firing guns in deck mounts
     on centreline, all aft
   Weight of broadside 141 lbs / 64 kg
   Shells per gun, main battery: 150
   8 - 17,7" / 450 mm above water torpedoes

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 4 shafts, 16 624 shp / 12 402 Kw = 29,60 kts
   Range 2 400nm at 14,00 kts
   Bunker at max displacement = 144 tons

Complement:
   79 - 103

Cost:
   £0,161 million / $0,642 million

Distribution of weights at normal displacement:
   Armament: 18 tons, 2,1%
   Machinery: 408 tons, 47,4%
   Hull, fittings & equipment: 279 tons, 32,5%
   Fuel, ammunition & stores: 110 tons, 12,8%
   Miscellaneous weights: 45 tons, 5,2%

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     270 lbs / 122 Kg = 7,6 x 4,1 " / 105 mm shells or 0,2 torpedoes
   Stability (Unstable if below 1.00): 1,12
   Metacentric height 0,8 ft / 0,3 m
   Roll period: 12,1 seconds
   Steadiness   - As gun platform (Average = 50 %): 100 %
         - Recoil effect (Restricted arc if above 1.00): 0,43
   Seaboat quality  (Average = 1.00): 1,41

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0,380
   Length to Beam Ratio: 11,38 : 1
   'Natural speed' for length: 17,39 kts
   Power going to wave formation at top speed: 61 %
   Trim (Max stability = 0, Max steadiness = 100): 71
   Bow angle (Positive = bow angles forward): 2,00 degrees
   Stern overhang: 0,00 ft / 0,00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      15,75 ft / 4,80 m
      - Forecastle (20%):   15,75 ft / 4,80 m
      - Mid (50%):      15,75 ft / 4,80 m (9,19 ft / 2,80 m aft of break)
      - Quarterdeck (25%):   9,19 ft / 2,80 m
      - Stern:      9,19 ft / 2,80 m
      - Average freeboard:   12,47 ft / 3,80 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 174,6%
      - Above water (accommodation/working, high = better): 77,2%
   Waterplane Area: 4 902 Square feet or 455 Square metres
   Displacement factor (Displacement / loading): 60%
   Structure weight / hull surface area: 26 lbs/sq ft or 129 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,51
      - Longitudinal: 2,20
      - Overall: 0,59
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is cramped
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

20 t - Mines
25t - Radio set

[Korpen]

Version 5. Hope, final ;D
DD1, Persia destroyer laid down 1916

The other designs have engine year 1909, should this design have 1909 as well?

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 4 shafts, 16 624 shp / 12 402 Kw = 29,60 kts
   Range 2 400nm at 14,00 kts
   Bunker at max displacement = 144 tons

   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      15,75 ft / 4,80 m
      - Forecastle (20%):   15,75 ft / 4,80 m
      - Mid (50%):      15,75 ft / 4,80 m (9,19 ft / 2,80 m aft of break)
      - Quarterdeck (25%):   9,19 ft / 2,80 m
      - Stern:      9,19 ft / 2,80 m
      - Average freeboard:   12,47 ft / 3,80 m
   Ship tends to be wet forward

Looks decent so far, but if You put midbreak at 35% and use the weight for more speed, what would she look like?

Hull strength (Relative):
      - Cross-sectional: 0,51
      - Longitudinal: 2,20
      - Overall: 0,59

You got some surplus strength in the hull.

[Kaiser Kirk]

Thinking of conventional destroyers, they have thier TTs on the centerline, 1-2 sets.  You've got twin TTs, which means you need 4 sets. At 8.1m beam she's very narrow, I don't think you have them on the sides like a cruiser, which means you have 4 sets on centerline?  That is hard to envision on a small destroyer.

[maddox]

Calculating.

Length of forcastle  18.43 m

Length of a 105 L40 gun   4.5m   1 meter separation between the guns =10 meter

Minimalistic bridge/deckhouse/Forward Funnel 4 meter

Midships funnel 2 meter

Length of an "avarage" 18" torpedo 4.5 meter  +1 meter   *4 = 24 meter.

Aft funnel  2 meter

aft guns, 10 meter

Quarter deck 23.09m

Total 
91.52 meter.   It should fit.

[helgi]

Orange has presented me a 1916 engine tech :)

[maddox]

Takes a while to learn to use that technology. 

That means you'll have buy foreign engines, or wait untill the tech is digested.