WesWorld

M-1 class Minesweeper/layer

M-1, laid down 1940
M-2, laid down 1940

Bharati-built units of the Bharati Pali class.

Displacement:
386 t light; 400 t standard; 420 t normal; 437 t full load

Dimensions: Length overall / water x beam x draught
157.50 ft / 157.50 ft x 19.70 ft x 7.90 ft (normal load)
48.01 m / 48.01 m x 6.00 m x 2.41 m

Armament:
2 - 4.13" / 105 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1939 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, evenly spread
2 - 1.38" / 35.0 mm guns in single mounts, 1.31lbs / 0.59kg shells, 1939 Model
Anti-aircraft guns in deck mounts
on centreline, all forward, all raised mounts - superfiring
4 - 0.59" / 15.0 mm guns in single mounts, 0.10lbs / 0.05kg shells, 1939 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 74 lbs / 33 kg
Shells per gun, main battery: 120

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 2.00" / 51 mm 0.40" / 10 mm -
2nd: 0.80" / 20 mm - -
3rd: 0.40" / 10 mm - -

Machinery:
Oil fired boilers, simple reciprocating steam engines,
Geared drive, 2 shafts, 1,244 ihp / 928 Kw = 15.70 kts
Range 2,000nm at 10.00 kts
Bunker at max displacement = 37 tons

Complement:
46 - 60

Cost:
£0.214 million / $0.856 million

Distribution of weights at normal displacement:
Armament: 9 tons, 2.2%
Armour: 6 tons, 1.5%
- Belts: 0 tons, 0.0%
- Torpedo bulkhead: 0 tons, 0.0%
- Armament: 6 tons, 1.5%
- Armour Deck: 0 tons, 0.0%
- Conning Tower: 0 tons, 0.0%
Machinery: 138 tons, 32.8%
Hull, fittings & equipment: 148 tons, 35.2%
Fuel, ammunition & stores: 34 tons, 8.1%
Miscellaneous weights: 85 tons, 20.2%
-40 t: Sweeping gear
-40 t: Capacity for 40 mines
-5 t: Weight reserve

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
246 lbs / 112 Kg = 7.0 x 4.1 " / 105 mm shells or 0.2 torpedoes
Stability (Unstable if below 1.00): 1.09
Metacentric height 0.5 ft / 0.2 m
Roll period: 11.5 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.64
Seaboat quality (Average = 1.00): 1.73

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.600
Length to Beam Ratio: 7.99 : 1
'Natural speed' for length: 12.55 kts
Power going to wave formation at top speed: 58 %
Trim (Max stability = 0, Max steadiness = 100): 29
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: 13.50 ft / 4.11 m
- Forecastle (20%): 9.20 ft / 2.80 m
- Mid (55%): 9.20 ft / 2.80 m (8.20 ft / 2.50 m aft of break)
- Quarterdeck (15%): 8.20 ft / 2.50 m
- Stern: 8.20 ft / 2.50 m
- Average freeboard: 9.09 ft / 2.77 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 144.6%
- Above water (accommodation/working, high = better): 82.1%
Waterplane Area: 2,269 Square feet or 211 Square metres
Displacement factor (Displacement / loading): 90%
Structure weight / hull surface area: 32 lbs/sq ft or 158 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.84
- Longitudinal: 4.60
- Overall: 1.00
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped
Excellent seaboat, comfortable, can fire her guns in the heaviest weather