Light Romanian Destroyers

[TexanCowboy]

A new Romanian destroyer design. Made under 500 tons intentionallyso that it can get into service quickly, so that it can fit into a Type 0 dock, and so that I can make a flotila of 3 to replace the aging Bucharesti's, of 22 years. And yes, it sort of is a jack of all trades, with mines and depth charges.
Adjuated speed is 30.5 knots. And for those who say I don't have a 5'' gun, Borys tells me its my standard rail caliber.

DD-1917, Romania Destroyer laid down 1917 (Engine 1912)

Displacement:
   458 t light; 496 t standard; 568 t normal; 625 t full load

Dimensions: Length overall / water x beam x draught
   220.00 ft / 220.00 ft x 21.00 ft x 10.00 ft (normal load)
   67.06 m / 67.06 m x 6.40 m  x 3.05 m

Armament:
     3 - 5.00" / 127 mm guns in single mounts, 62.50lbs / 28.35kg shells, 1917 Model
     Quick firing guns in deck mounts
     on centreline ends, majority forward
     2 - 1.00" / 25.4 mm guns in single mounts, 0.50lbs / 0.23kg shells, 1917 Model
     Anti-aircraft guns in deck mounts
     on centreline, evenly spread
     4 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1917 Model
     Machine guns in deck mounts
     on side, evenly spread
   Weight of broadside 189 lbs / 86 kg
   Shells per gun, main battery: 250
   4 - 21.0" / 533.4 mm above water torpedoes

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 1 shaft, 12,670 shp / 9,452 Kw = 28.00 kts
   Range 5,100nm at 10.00 kts
   Bunker at max displacement = 129 tons

Complement:
   57 - 75

Cost:
   £0.131 million / $0.525 million

Distribution of weights at normal displacement:
   Armament: 24 tons, 4.2 %
   Machinery: 259 tons, 45.7 %
   Hull, fittings & equipment: 164 tons, 28.9 %
   Fuel, ammunition & stores: 109 tons, 19.3 %
   Miscellaneous weights: 11 tons, 1.9 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     135 lbs / 61 Kg = 2.2 x 5.0 " / 127 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.23
   Metacentric height 0.7 ft / 0.2 m
   Roll period: 10.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.63
   Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
   Hull has raised forecastle
   Block coefficient: 0.430
   Length to Beam Ratio: 10.48 : 1
   'Natural speed' for length: 14.83 kts
   Power going to wave formation at top speed: 69 %
   Trim (Max stability = 0, Max steadiness = 100): 49
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      15.00 ft / 4.57 m
      - Forecastle (20 %):   12.00 ft / 3.66 m (10.00 ft / 3.05 m aft of break)
      - Mid (50 %):      10.00 ft / 3.05 m
      - Quarterdeck (15 %):   10.00 ft / 3.05 m
      - Stern:      10.00 ft / 3.05 m
      - Average freeboard:   10.64 ft / 3.24 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 183.3 %
      - Above water (accommodation/working, high = better): 37.1 %
   Waterplane Area: 2,755 Square feet or 256 Square metres
   Displacement factor (Displacement / loading): 47 %
   Structure weight / hull surface area: 24 lbs/sq ft or 115 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 3.48
      - Overall: 0.60
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is extremely poor

4 tons for torpedos
4 tons for 12 depth charges
1 ton for crew comfort
2 tons for 2 mines

[Jefgte]

Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      15.00 ft / 4.57 m
      - Forecastle (20 %):   12.00 ft / 3.66 m (10.00 ft / 3.05 m aft of break)
      - Mid (50 %):      10.00 ft / 3.05 m
      - Quarterdeck (15 %):   10.00 ft / 3.05 m
      - Stern:      10.00 ft / 3.05 m
      - Average freeboard:   10.64 ft / 3.24 m
   Ship tends to be wet forward

test a decrease freeboard quarter (9ft) & stern (8ft)...

;)

[TexanCowboy]

I just did. It's really not worth it. It has no seakeeping ability and only gains .01 compsite strength.

[ctwaterman]

Sorry *Evil Laugh* but tweeking will make improvements but unfortunately you dont have the Tech for Depth Charges yet  ;)

Other wise the desire for a small cheap multi role Destroyer is not a bad Idea Italia has been trying to find a working design for about 3 years right now.

Charles

[TexanCowboy]

I see. So perhaps add two more torpedo tubes instead?

[TexanCowboy]

Try two. Got rid of the depth charges, and used the weight savings to add 4 3'' guns and 2 torpedo tubes, at the cost of a 5'' gun.

DD-1917,Romaina Destroyer laid down 1917 (Engine 1912)

Displacement:
   468 t light; 496 t standard; 568 t normal; 625 t full load

Dimensions: Length overall / water x beam x draught
   225.31 ft / 220.00 ft x 21.00 ft x 10.00 ft (normal load)
   68.68 m / 67.06 m x 6.40 m  x 3.05 m

Armament:
      2 - 5.00" / 127 mm guns in single mounts, 62.50lbs / 28.35kg shells, 1917 Model
     Quick firing guns in deck mounts
     on centreline ends, evenly spread
      2 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1917 Model
     Quick firing guns in deck mounts
     on centreline ends, evenly spread
      2 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1917 Model
     Quick firing guns in deck mounts
     on side, evenly spread
      2 - 1.00" / 25.4 mm guns in single mounts, 0.50lbs / 0.23kg shells, 1917 Model
     Anti-aircraft guns in deck mounts
     on side, evenly spread
      6 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1917 Model
     Machine guns in deck mounts
     on side, evenly spread
   Weight of broadside 180 lbs / 82 kg
   Shells per gun, main battery: 150
   6 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   2.00" / 51 mm         -               -

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 1 shaft, 12,670 shp / 9,452 Kw = 28.00 kts
   Range 5,121nm at 10.00 kts
   Bunker at max displacement = 129 tons

Complement:
   57 - 75

Cost:
   £0.130 million / $0.520 million

Distribution of weights at normal displacement:
   Armament: 23 tons, 4.0 %
   Armour: 11 tons, 2.0 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 11 tons, 2.0 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 259 tons, 45.6 %
   Hull, fittings & equipment: 164 tons, 28.9 %
   Fuel, ammunition & stores: 100 tons, 17.6 %
   Miscellaneous weights: 11 tons, 1.9 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     131 lbs / 59 Kg = 2.1 x 5.0 " / 127 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.09
   Metacentric height 0.6 ft / 0.2 m
   Roll period: 11.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.68
   Seaboat quality  (Average = 1.00): 1.00

Hull form characteristics:
   Hull has raised forecastle
   Block coefficient: 0.430
   Length to Beam Ratio: 10.48 : 1
   'Natural speed' for length: 14.83 kts
   Power going to wave formation at top speed: 69 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 5.00 degrees
   Stern overhang: 4.00 ft / 1.22 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      15.00 ft / 4.57 m
      - Forecastle (20 %):   12.00 ft / 3.66 m (10.00 ft / 3.05 m aft of break)
      - Mid (50 %):      10.00 ft / 3.05 m
      - Quarterdeck (15 %):   10.00 ft / 3.05 m
      - Stern:      10.00 ft / 3.05 m
      - Average freeboard:   10.64 ft / 3.24 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 180.0 %
      - Above water (accommodation/working, high = better): 9.7 %
   Waterplane Area: 2,755 Square feet or 256 Square metres
   Displacement factor (Displacement / loading): 47 %
   Structure weight / hull surface area: 24 lbs/sq ft or 115 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 3.48
      - Overall: 0.60
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is extremely poor

6 tons for torpedoes
4 tons for mines(4 mines)
1 tons for crew comfort

[ctwaterman]

Better much much better.  Now as 4 mines is pretty much useless for mining anything other then say a river canal entrance I would recomend you simply delete them and add that to the crew comfort features.  Add an extra Pasta cooker or purchase one of those new fangled CSA Ice Cream makers :)

Also under the rule for designing ships thier is a speed calculator for ships I will use it to  show the true trial speed of these small boats.

Around 30.5 Knots

Charles.

[TexanCowboy]

I had posted that. Yeah, I realize I can take off the mines, but I don't have any minelayers at this point in time, and these are better than 1 24 knot minelayer.

[ctwaterman]

For Defensive Mine Laying you simply utilize a fishing boat or a small fleet of them.

A good Tuna boat has everything you need to lay dozens of mines,  A winch and a low back deck :)

For Offensive mine laying operations you would either need 10 or more of these to lay a single small 40 mine pattern or a single 24 Knot ship with no guns and lots and lots of mines :)

Charles

[maddox]

Quick and dirty

Toasty, French minelayer laid down 1917 (Engine 1912)

Displacement:
   499 t light; 514 t standard; 580 t normal; 632 t full load

Dimensions: Length overall / water x beam x draught
   229,66 ft / 226,38 ft x 26,25 ft x 7,22 ft (normal load)
   70,00 m / 69,00 m x 8,00 m  x 2,20 m

Armament:
      2 - 2,76" / 70,0 mm guns in single mounts, 11,02lbs / 5,00kg shells, 1917 Model
     Quick firing guns in deck mounts
     on centreline, all forward
      2 - 1,46" / 37,0 mm guns in single mounts, 1,55lbs / 0,70kg shells, 1917 Model
     Anti-aircraft guns in deck mounts
     on side, all amidships
   Weight of broadside 25 lbs / 11 kg
   Shells per gun, main battery: 220

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0,50" / 13 mm   0,50" / 13 mm            -
   2nd:   0,50" / 13 mm         -               -

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 11.498 shp / 8.577 Kw = 27,00 kts
   Trial speed 29.5 kts
   Range 3.000nm at 12,00 kts
   Bunker at max displacement = 117 tons

Complement:
   58 - 76

Cost:
   £0,111 million / $0,444 million

Distribution of weights at normal displacement:
   Armament: 3 tons, 0,5%
   Armour: 2 tons, 0,4%
      - Belts: 0 tons, 0,0%
      - Torpedo bulkhead: 0 tons, 0,0%
      - Armament: 2 tons, 0,4%
      - Armour Deck: 0 tons, 0,0%
      - Conning Tower: 0 tons, 0,0%
   Machinery: 293 tons, 50,6%
   Hull, fittings & equipment: 181 tons, 31,2%
   Fuel, ammunition & stores: 80 tons, 13,8%
   Miscellaneous weights: 20 tons, 3,5%

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     234 lbs / 106 Kg = 22,3 x 2,8 " / 70 mm shells or 0,2 torpedoes
   Stability (Unstable if below 1.00): 1,24
   Metacentric height 1,0 ft / 0,3 m
   Roll period: 11,1 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0,07
   Seaboat quality  (Average = 1.00): 1,01

Hull form characteristics:
   Hull has low quarterdeck
   Block coefficient: 0,473
   Length to Beam Ratio: 8,63 : 1
   'Natural speed' for length: 15,05 kts
   Power going to wave formation at top speed: 70 %
   Trim (Max stability = 0, Max steadiness = 100): 70
   Bow angle (Positive = bow angles forward): -5,00 degrees
   Stern overhang: 3,28 ft / 1,00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      18,04 ft / 5,50 m
      - Forecastle (20%):   13,78 ft / 4,20 m
      - Mid (50%):      13,45 ft / 4,10 m
      - Quarterdeck (25%):   6,56 ft / 2,00 m (13,45 ft / 4,10 m before break)
      - Stern:      6,56 ft / 2,00 m
      - Average freeboard:   12,19 ft / 3,71 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 171,4%
      - Above water (accommodation/working, high = better): 171,9%
   Waterplane Area: 3.865 Square feet or 359 Square metres
   Displacement factor (Displacement / loading): 60%
   Structure weight / hull surface area: 24 lbs/sq ft or 115 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,50
      - Longitudinal: 2,99
      - Overall: 0,60
   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

20 ton mines

[TexanCowboy]

Not really much of a point for what I'm going for. These new ships will be replacing the Bucharesti-class, which will be put into reserve, as they're really the only orginal ships I had that could hit 30 knots. And ct, this is probebly better for a high speed raid of a enemy port, firing torpedos at ships AND laying down mines then a fleet of fishing boats. And the main guns on this ship could probebly hurt a light cruiser.

[maddox]

Shooting hard enough to hurt a CL, as well torpedo's, as mines, and then a high speed?

On 500 tons, that is a tall order.

Maybe this one is a potential cannidate for a change.
Maybe using only 4 torpedo's, oilfiring and replace the 75mm guns with larger guns.
(I don't have SS here atm)

[TexanCowboy]

Isn't what I have enough?

[maddox]

Not enough mines. 4 mines dumped in a dock could do something, but 4 mines in a larger river delta, then time is needed to hit something.

[TexanCowboy]

Still, I would think that building 3 ships that are really top of the line torpedo-gun-boats is better than using all of that on a slow, bulky minelayer. Although this is intriging. Maybe I can build these three the first half, than some different design the second half.