D-33 Jagannath

Jeremy · January 27, 2025, 08:10:51 PM

Jagannath, Laksamanavati destroyer, laid down 1924

The Jagannaths continued to improve the speed and range of Laksmanavati destroyers, able to steam 11,000 nmi at 10 kt and were slightly better seaboats than the previous generation. The explosive paravanes proved to be less effective than depth charges which were again the ASW weapon of choice.

Displacement:
1,500 t light; 1,570 t standard; 1,773 t normal; 1,936 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(384.40 ft / 380.58 ft) x 32.81 ft x (12.43 / 13.17 ft)
(117.16 m / 116.00 m) x 10.00 m x (3.79 / 4.01 m)

Armament:
5 - 4.33" / 110 mm 45.0 cal guns - 40.96lbs / 18.58kg shells, 250 per gun
Quick firing guns in deck mounts, 1924 Model
5 x Single mounts on centreline ends, majority aft
2 raised mounts - superfiring
6 - 1.57" / 40.0 mm 39.0 cal guns - 1.85lbs / 0.84kg shells, 900 per gun
Anti-air guns in deck mounts, 1924 Model
6 x Single mounts on side ends, majority forward
2 raised mounts - superfiring
12 - 0.47" / 12.0 mm 90.0 cal guns - 0.07lbs / 0.03kg shells, 2,000 per gun
Machine guns in deck mounts, 1928 Model
6 x 2-gun mounts on side ends, majority forward
6 raised mounts
Weight of broadside 217 lbs / 98 kg

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm - -
2nd: 0.39" / 10 mm - -
3rd: 0.39" / 10 mm - -

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 34,800 shp / 25,961 Kw = 32.50 kts
Range 10,000nm at 10.00 kts
Bunker at max displacement = 366 tons

Complement:
136 - 177

Cost:
£0.593 million / $2.370 million

Distribution of weights at normal displacement:
Armament: 40 tons, 2.2 %
- Guns: 40 tons, 2.2 %
Armour: 18 tons, 1.0 %
- Armament: 18 tons, 1.0 %
Machinery: 916 tons, 51.7 %
Hull, fittings & equipment: 431 tons, 24.3 %
Fuel, ammunition & stores: 274 tons, 15.4 %
Miscellaneous weights: 94 tons, 5.3 %
- Hull below water: 5 tons
- On freeboard deck: 60 tons
- Above deck: 29 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
449 lbs / 204 Kg = 11.1 x 4.3 " / 110 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.18
Metacentric height 1.3 ft / 0.4 m
Roll period: 12.2 seconds
Steadiness - As gun platform (Average = 50 %): 80 %
- Recoil effect (Restricted arc if above 1.00): 0.27
Seaboat quality (Average = 1.00): 1.16

Hull form characteristics:
Hull has rise forward of midbreak,
a normal bow and a cruiser stern
Block coefficient (normal/deep): 0.400 / 0.412
Length to Beam Ratio: 11.60 : 1
'Natural speed' for length: 19.51 kts
Power going to wave formation at top speed: 61 %
Trim (Max stability = 0, Max steadiness = 100): 69
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 21.65 ft / 6.60 m, 18.04 ft / 5.50 m
- Forward deck: 30.00 %, 18.04 ft / 5.50 m, 16.73 ft / 5.10 m
- Aft deck: 35.00 %, 8.86 ft / 2.70 m, 8.86 ft / 2.70 m
- Quarter deck: 15.00 %, 8.86 ft / 2.70 m, 9.51 ft / 2.90 m
- Average freeboard: 13.59 ft / 4.14 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 174.4 %
- Above water (accommodation/working, high = better): 137.7 %
Waterplane Area: 7,686 Square feet or 714 Square metres
Displacement factor (Displacement / loading): 71 %
Structure weight / hull surface area: 31 lbs/sq ft or 149 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 1.28
- Overall: 0.55
Cramped machinery, storage, compartmentation space
Excellent accommodation and workspace room
Ship has slow, easy roll, a good, steady gun platform

Fittings:
-4 t: 1918 Fire Control (above deck)
-25 t: L/R wireless (above deck)
-48 t: 4x3 21" TT
-5 t: 50x 90kg DC (on deck)
-5 t: Basic hydrophone (vital)
-7 t: Weight reserve (above deck)

Trial Speed: 33 kt
Bonus: 0.5
Range: 11000 (geared bonus)

Jeremy · January 27, 2025, 08:14:19 PM

Sundari, Laksamanavati destroyer laid down 1928

The Sundari-class destroyers were more correctly a subclass of the Jagannath-class, being built on the same hull but with more modern engines. This upgrade gave the Sundaris a range of 13,200 nm. The Sundaris were also an improved ASW platform, mounting updated hydrophones and heavier, 195 kg depth charges.

Displacement:
1,500 t light; 1,571 t standard; 1,806 t normal; 1,995 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(384.40 ft / 380.58 ft) x 32.81 ft x (12.66 / 13.52 ft)
(117.16 m / 116.00 m) x 10.00 m x (3.86 / 4.12 m)

Armament:
5 - 4.33" / 110 mm 45.0 cal guns - 40.96lbs / 18.58kg shells, 250 per gun
Quick firing guns in deck mounts, 1928 Model
5 x Single mounts on centreline ends, majority aft
2 raised mounts - superfiring
6 - 1.57" / 40.0 mm 39.0 cal guns - 1.85lbs / 0.84kg shells, 900 per gun
Anti-air guns in deck mounts, 1928 Model
6 x Single mounts on side ends, majority forward
2 raised mounts - superfiring
12 - 0.47" / 12.0 mm 90.0 cal guns - 0.07lbs / 0.03kg shells, 2,000 per gun
Machine guns in deck mounts, 1928 Model
6 x Twin mounts on side ends, majority forward
6 raised mounts
Weight of broadside 217 lbs / 98 kg

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm - -
2nd: 0.39" / 10 mm - -
3rd: 0.39" / 10 mm - -

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 35,200 shp / 26,259 Kw = 32.50 kts
Range 12,000nm at 10.00 kts
Bunker at max displacement = 424 tons

Complement:
138 - 180

Cost:
£0.729 million / $2.914 million

Distribution of weights at normal displacement:
Armament: 40 tons, 2.2 %
- Guns: 40 tons, 2.2 %
Armour: 18 tons, 1.0 %
- Armament: 18 tons, 1.0 %
Machinery: 910 tons, 50.4 %
Hull, fittings & equipment: 430 tons, 23.8 %
Fuel, ammunition & stores: 306 tons, 17.0 %
Miscellaneous weights: 102 tons, 5.6 %
- Hull below water: 15 tons
- On freeboard deck: 58 tons
- Above deck: 29 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
470 lbs / 213 Kg = 11.6 x 4.3 " / 110 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.19
Metacentric height 1.3 ft / 0.4 m
Roll period: 12.1 seconds
Steadiness - As gun platform (Average = 50 %): 80 %
- Recoil effect (Restricted arc if above 1.00): 0.27
Seaboat quality (Average = 1.00): 1.16

Hull form characteristics:
Hull has rise forward of midbreak,
a normal bow and a cruiser stern
Block coefficient (normal/deep): 0.400 / 0.414
Length to Beam Ratio: 11.60 : 1
'Natural speed' for length: 19.51 kts
Power going to wave formation at top speed: 61 %
Trim (Max stability = 0, Max steadiness = 100): 69
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 21.65 ft / 6.60 m, 18.04 ft / 5.50 m
- Forward deck: 30.00 %, 18.04 ft / 5.50 m, 16.73 ft / 5.10 m
- Aft deck: 35.00 %, 8.86 ft / 2.70 m, 8.86 ft / 2.70 m
- Quarter deck: 15.00 %, 8.86 ft / 2.70 m, 9.51 ft / 2.90 m
- Average freeboard: 13.59 ft / 4.14 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 170.8 %
- Above water (accommodation/working, high = better): 135.7 %
Waterplane Area: 7,686 Square feet or 714 Square metres
Displacement factor (Displacement / loading): 75 %
Structure weight / hull surface area: 30 lbs/sq ft or 148 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 1.28
- Overall: 0.54
Cramped machinery, storage, compartmentation space
Excellent accommodation and workspace room
Ship has slow, easy roll, a good, steady gun platform

Fittings:
-4 t: Fire control (1918) (above deck)
-25 t: L/R wireless (above deck)
-48 t: 4x3 21" TT (on deck)
-15 t: Enhanced hydrophone package (vital)
-5 t: 25x 195 kg DC (on deck)
-5 t: Weight reserve (above deck)

Trial Speed: 33 kt
Bonus: 0.5
Range: 13200 (geared bonus)

D-33 Jagannath

Jeremy

Jeremy