Bharat Designs

[miketr]

Bharat is building several of this ships for the export market.  Any comments?

They are based upon this Dutch Design.

http://www.navalism.org/index.php?topic=690.msg23469#msg23469

BDD-1919 - Export, Bharat Destroyer laid down 1919 (Engine 1916)

Displacement:
   1,001 t light; 1,037 t standard; 1,205 t normal; 1,339 t full load

Dimensions: Length overall / water x beam x draught
   328.16 ft / 324.80 ft x 29.53 ft x 10.99 ft (normal load)
   100.02 m / 99.00 m x 9.00 m  x 3.35 m

Armament:
      4 - 4.13" / 105 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1919 Model
     Breech loading guns in deck mounts
     on centreline ends, evenly spread, 2 raised mounts - superfiring
      4 - 0.49" / 12.5 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1919 Model
     Breech loading guns in deck mounts
     on side, all amidships, all raised mounts - superfiring
   Weight of broadside 142 lbs / 64 kg
   Shells per gun, main battery: 150
   6 - 17.7" / 450 mm above water torpedoes

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.59" / 15 mm         -               -

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 27,982 shp / 20,874 Kw = 32.00 kts
   Range 8,850nm at 10.00 kts
   Bunker at max displacement = 301 tons

Complement:
   101 - 132

Cost:
   £0.307 million / $1.227 million

Distribution of weights at normal displacement:
   Armament: 18 tons, 1.5 %
   Armour: 5 tons, 0.4 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 5 tons, 0.4 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 647 tons, 53.7 %
   Hull, fittings & equipment: 306 tons, 25.4 %
   Fuel, ammunition & stores: 203 tons, 16.9 %
   Miscellaneous weights: 25 tons, 2.1 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     279 lbs / 127 Kg = 7.9 x 4.1 " / 105 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.37
   Metacentric height 1.4 ft / 0.4 m
   Roll period: 10.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.17
   Seaboat quality  (Average = 1.00): 0.95

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0.400
   Length to Beam Ratio: 11.00 : 1
   'Natural speed' for length: 18.02 kts
   Power going to wave formation at top speed: 65 %
   Trim (Max stability = 0, Max steadiness = 100): 75
   Bow angle (Positive = bow angles forward): 10.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      19.03 ft / 5.80 m
      - Forecastle (15 %):   17.06 ft / 5.20 m
      - Mid (32 %):      17.06 ft / 5.20 m (9.19 ft / 2.80 m aft of break)
      - Quarterdeck (10 %):   9.19 ft / 2.80 m
      - Stern:      9.19 ft / 2.80 m
      - Average freeboard:   11.82 ft / 3.60 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 186.9 %
      - Above water (accommodation/working, high = better): 84.7 %
   Waterplane Area: 5,904 Square feet or 548 Square metres
   Displacement factor (Displacement / loading): 53 %
   Structure weight / hull surface area: 27 lbs/sq ft or 134 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.29
      - Overall: 0.54
   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
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

Trial Speed 33.01 knots

Misc Weight Assignment
6 tons - 17.7" Torpedoes x6
19 Tons - construction reserve

[Logi]

Can you try:

5 x 105mm gun + 2 x 3tt 21"? (I'll supply the larger tubes).

[miketr]

No problem I will do a different design with five 105's and 21" torpedo's.  Checking the reports they would have 21" torpedo's by this point. 

Any other requests?

[miketr]

Better?

BDD-1919 - Export, Bharat Destroyer laid down 1919 (Engine 1916)

Displacement:
   999 t light; 1,037 t standard; 1,205 t normal; 1,339 t full load

Dimensions: Length overall / water x beam x draught
   328.16 ft / 324.80 ft x 29.53 ft x 10.99 ft (normal load)
   100.02 m / 99.00 m x 9.00 m  x 3.35 m

Armament:
      5 - 4.13" / 105 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1919 Model
     Breech loading guns in deck mounts
     on centreline, evenly spread, 2 raised mounts
      4 - 0.49" / 12.5 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1919 Model
     Breech loading guns in deck mounts
     on side, all amidships, all raised mounts - superfiring
   Weight of broadside 177 lbs / 80 kg
   Shells per gun, main battery: 150
   6 - 21.0" / 533 mm above water torpedoes

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.59" / 15 mm         -               -

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 27,982 shp / 20,874 Kw = 32.00 kts
   Range 8,850nm at 10.00 kts
   Bunker at max displacement = 301 tons

Complement:
   101 - 132

Cost:
   £0.313 million / $1.250 million

Distribution of weights at normal displacement:
   Armament: 22 tons, 1.8 %
   Armour: 7 tons, 0.5 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 7 tons, 0.5 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 641 tons, 53.2 %
   Hull, fittings & equipment: 311 tons, 25.8 %
   Fuel, ammunition & stores: 206 tons, 17.1 %
   Miscellaneous weights: 18 tons, 1.5 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     274 lbs / 124 Kg = 7.8 x 4.1 " / 105 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.33
   Metacentric height 1.3 ft / 0.4 m
   Roll period: 10.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.22
   Seaboat quality  (Average = 1.00): 0.94

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0.400
   Length to Beam Ratio: 11.00 : 1
   'Natural speed' for length: 18.02 kts
   Power going to wave formation at top speed: 65 %
   Trim (Max stability = 0, Max steadiness = 100): 76
   Bow angle (Positive = bow angles forward): 10.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      19.03 ft / 5.80 m
      - Forecastle (15 %):   17.06 ft / 5.20 m
      - Mid (32 %):      17.06 ft / 5.20 m (9.19 ft / 2.80 m aft of break)
      - Quarterdeck (10 %):   9.19 ft / 2.80 m
      - Stern:      9.19 ft / 2.80 m
      - Average freeboard:   11.82 ft / 3.60 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 187.3 %
      - Above water (accommodation/working, high = better): 69.6 %
   Waterplane Area: 5,904 Square feet or 548 Square metres
   Displacement factor (Displacement / loading): 53 %
   Structure weight / hull surface area: 28 lbs/sq ft or 136 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.31
      - Overall: 0.55
   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
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

Trial Speed 33.0 knots

Misc Weight Assignment
6 tons - 21" Torpedoes x6
12 Tons - construction reserve

[Logi]

It's better. ;) Acceptable for a foreign built.

Does Bharat have twin mounts (mount & hoist or simple deck mounts)?

[miketr]

Bharat could have a twin mount but it would be a pair of twin 105's not three twin 105's.  I haven't done any designs for DD's for Iberia with Mount and Hoist, its going to cost big time for stability and until later I don't think it makes much sense or is very historic.

From what I have read on DD's of this time period they aren't in a powered enclosed mount with a load hoist.  Its open mounts, a ready ammo supply and then a chain of people to the magazine.

OOC Otherwise the buyer is always right and they can have whatever design points Bharat has the tech for.

[Logi]

Yes, then this design will be alright. Can you just manually bump up the light displacement so it makes 1000. Way easier for bookkeeping.

[miketr]

Cut the range down a bit and added more Misc Weight, done.

BDD-1919 - Export, Bharat Destroyer laid down 1919 (Engine 1916)

Displacement:
   1,000 t light; 1,039 t standard; 1,205 t normal; 1,337 t full load

Dimensions: Length overall / water x beam x draught
   328.16 ft / 324.80 ft x 29.53 ft x 10.99 ft (normal load)
   100.02 m / 99.00 m x 9.00 m  x 3.35 m

Armament:
      5 - 4.13" / 105 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1919 Model
     Breech loading guns in deck mounts
     on centreline, evenly spread, 2 raised mounts
      4 - 0.49" / 12.5 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1919 Model
     Breech loading guns in deck mounts
     on side, all amidships, all raised mounts - superfiring
   Weight of broadside 177 lbs / 80 kg
   Shells per gun, main battery: 150
   6 - 21.0" / 533 mm above water torpedoes

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.59" / 15 mm         -               -

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 27,982 shp / 20,874 Kw = 32.00 kts
   Range 8,750nm at 10.00 kts
   Bunker at max displacement = 298 tons

Complement:
   101 - 132

Cost:
   £0.312 million / $1.250 million

Distribution of weights at normal displacement:
   Armament: 22 tons, 1.8 %
   Armour: 7 tons, 0.5 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 7 tons, 0.5 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 640 tons, 53.2 %
   Hull, fittings & equipment: 310 tons, 25.8 %
   Fuel, ammunition & stores: 204 tons, 17.0 %
   Miscellaneous weights: 21 tons, 1.7 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     273 lbs / 124 Kg = 7.7 x 4.1 " / 105 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.32
   Metacentric height 1.3 ft / 0.4 m
   Roll period: 10.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.22
   Seaboat quality  (Average = 1.00): 0.94

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0.400
   Length to Beam Ratio: 11.00 : 1
   'Natural speed' for length: 18.02 kts
   Power going to wave formation at top speed: 65 %
   Trim (Max stability = 0, Max steadiness = 100): 76
   Bow angle (Positive = bow angles forward): 10.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      19.03 ft / 5.80 m
      - Forecastle (15 %):   17.06 ft / 5.20 m
      - Mid (32 %):      17.06 ft / 5.20 m (9.19 ft / 2.80 m aft of break)
      - Quarterdeck (10 %):   9.19 ft / 2.80 m
      - Stern:      9.19 ft / 2.80 m
      - Average freeboard:   11.82 ft / 3.60 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 187.4 %
      - Above water (accommodation/working, high = better): 69.6 %
   Waterplane Area: 5,904 Square feet or 548 Square metres
   Displacement factor (Displacement / loading): 53 %
   Structure weight / hull surface area: 28 lbs/sq ft or 136 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.30
      - Overall: 0.55
   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
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

Trial Speed 33.0 knots

Misc Weight Assignment
6 tons - 21" Torpedoes x6
15 Tons - construction reserve

[Logi]

Excellent, now I'll just have to add them to my sim report.

[miketr]

Excellent, now I'll just have to add them to my sim report.

Just keep in mind the following Logi.

If the ship is larger than 500 t light displacement, the minimum building time is:  (light displacement / 1000) + 9 months.  This figure may be rounded to the nearest month.

Thats 10 months for these DD's

http://www.navalism.org/index.php?topic=2965.0

The ships are laid down start of 1919 H2 as per the agreement that means you won't see them till near the END of 1920 H1.

[Logi]

Ah right, I forgot about the tonnage build time. I'm too sued to building stuff that finishes within 6 months.