WesWorld

Indian Naval Developments - Q1/1922

A. Industrial Allocation

7/10 factories producing warship material = 7,000 t, plus a stockpile of 48 t, for 7,048 t. 5,875 t are used, leaving 1173 t stockpiled

3/10 factories dedicated to producing infrastructure material = 0.3 pts

B. Infrastructure Development

0.3 pts invested in Factory Eleven, which is now at 8.8 pts

C. Naval Construction

At Mumbai

D3: Idle
S2: Oiler Mahanadi receives 1472 t; due to complete 30/7/23
S0: Minesweeper Brahmaputra laid down 1/1/22, receives 309 t, launched 1/3/22.
Free-floating: CL Kalyan receives 614 t, completes 28/2/22

At Columbo

S1: Destroyer G-131 receives 360 t; launched 1/2/22, due to complete 30/7/22
S0: Minesweeper Ayeyarwady receives 203 t, launched 12/2/22; due to complete 30/7/22
Free-floating: Minesweeper Ganges receives 68 t, completes 31/1/22

At Sikkwe

S1: Sloop S-102 receives 297 t, launched 31/3/22; due to complete 1/8/22
S0: Idle
D0: Idle
Free-floating: Sloop S-101 receives 99 t, completes 31/1/22

At Madras

S3: Sloop S-103 laid down 1/1/22, receives 297 t, due to launch 1/5/22
S2: Seaplane Tender Palk Bay launched 1/1/22, receives 1302 t
S1: Destroyer G-132 laid down 21/2/22, receives 146 t
D2: Idle
D1: Idle
Free-floating: Monitor Chandragupta receives 883 t; due to complete 5/22

The commercial shipyard at Cochin builds 3 100t motor torpedo boats

D. Transactions

None

E. Other Notes

DD G-129 , CV Otta complete their shakedown cruises.

CA Male continues shakedown cruise.

CL Kalyan , AM Ganges , SL S-101 begin shakedown cruises

Submarine IX-1 continues shake-down cruise, transfers to Indian waters with destroyer escort

New units laid down this quarter: One destroyer, one minesweeper, one sloop

F. Updated Order of Battle, 31/3/22

Note: Y)+Z = completed (under repair/refit) + under construction

BB: 2(0)+0
CV: 1(0)+0
CA: 3(0)+0
CL: 10(0)+0
DD: 25(0)+2
TB: 13(0)+0
SS: 1(0)+0

The list does not include auxiliaries and minor combatants.

The Brahmaputra class minesweepers are smaller than the preceeding Ganges class, reflecting their coastal duties and the desire to produce the type at a faster pace.

G-132 and S-103 are of the G-131 and S-101 classes, which I believe I've posted previously.

Brahmaputra class minesweeper, laid down 1922

Length, 160 ft x Beam, 28.0 ft x Depth, 8.5 ft
544 tons normal displacement (479 tons standard)

Main battery: 1 x 4.1-inch
Secondary battery: 2 x 1.4-inch
AA battery: 2 x 0.6-inch

Weight of broadside: 37 lbs

Main belt, 2.0 inches; ends unarmored
Armor deck, average 1.0 inches
C.T., 2.0 inches

Battery armor:
Main, 2.0" shields / secondary, 1.0" shields
AA, 1.0" shields

Maximum speed for 2499 shp = 17.86 knots
Approximate cruising radius, 4000 nm / 12 kts

Typical complement: 56-73


Estimated cost, $350,000 (£87,000)

Remarks:

Ship has slow, easy roll; a good, steady gun platform.

Good seaboat; rides out heavy weather easily.

Magazines and engineering spaces are roomy, with superior
watertight subdivision.


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 5 tons = 1 pct
Armor, total ..................... 116 tons = 21 pct

Belt 58 tons = 11 pct
Deck 52 tons = 10 pct
C.T. 3 tons = 1 pct
Armament 3 tons = 1 pct

Machinery ........................ 85 tons = 16 pct
Hull and fittings; equipment ..... 219 tons = 40 pct
Fuel, ammunition, stores ......... 79 tons = 15 pct
Miscellaneous weights ............ 40 tons = 7 pct
-----
544 tons = 100 pct

Estimated metacentric height, 0.9 ft

Displacement summary:

Light ship: 465 tons
Standard displacement: 479 tons
Normal service: 544 tons
Full load: 594 tons

Loading submergence 80 tons/foot

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Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.09

Shellfire needed to sink: 1129 lbs = 32.8 x 4.1-inch shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 0.8
(Approximates number of 'typical'
torpedo hits needed to sink ship)

Relative steadiness as gun platform, 72 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.08

Relative quality as a seaboat: 1.31

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Hull form characteristics:

Block coefficient: 0.50
Sharpness coefficient: 0.40
Hull speed coefficient 'M' = 5.99
'Natural speed' for length = 12.6 knots
Power going to wave formation
at top speed: 65 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 66 percent

Relative accommodation and working space: 105 percent


Displacement factor: 150 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 1.03
(Structure weight per square
foot of hull surface: 45 lbs)

Relative longitudinal hull strength: 5.01
(for 11.0 ft average freeboard;
freeboard adjustment +2.5 ft)

Relative composite hull strength: 1.20

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[Machine-readable parameters: Spring Style v. 1.2.1]

160.00 x 28.00 x 8.50; 11.00 -- Dimensions
0.50 -- Block coefficient
1922 -- Year laid down
17.86 / 4000 / 12.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
40 tons -- Miscellaneous weights
++++++++++
1 x 4.10; 0 -- Main battery; turrets
Central positioning of guns
Gun-shields
:
2 x 1.40; 0 -- Secondary battery; turrets
Gun-shields
:
2 x 0.60 -- Tertiary (QF/AA) battery
Gun-shields
:
0 -- No fourth (light) battery
0 -- No torpedo armament
++++++++++
2.00 / 0.00 / 0.00 / 0.00; 100 -- Belt armor; relative extent
1.00 / 2.00 -- Deck / CT
2.00 / 1.00 / 1.00 / 0.00 -- Battery armor


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