WesWorld

Motor Minesweeper laid down 1941

Displacement: 133 t light; 137 t standard; 150 t normal; 161 t full load

Dimensions: Length overall / water x beam x draught

125.23 ft / 118.11 ft x 18.70 ft x 5.12 ft (normal load) [38.17 m / 36.00 m x 5.70 m x 1.56 m]

Armament:

2 - 0.98" / 25.0 mm guns in single mounts, 0.48lbs / 0.22kg shells, 1941 Model Anti-aircraft guns in deck mounts on centreline ends, evenly spread
Weight of broadside 1 lbs / 0 kg
Shells per gun, main battery: 500

Armour:

Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.39" / 10 mm - -

Machinery:

Diesel Internal combustion motors, Geared drive, 3 shafts, 790 shp / 589 Kw = 16.00 kts
Range 2,000nm at 12.00 kts
Bunker at max displacement = 24 tons

Complement: 20 - 27

Cost: £0.048 million / $0.190 million

Distribution of weights at normal displacement:

Armament: 0 tons, 0.1 %
Armour: 0 tons, 0.1 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 0 tons, 0.1 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 21 tons, 13.9 %
Hull, fittings & equipment: 62 tons, 41.5 %
Fuel, ammunition & stores: 17 tons, 11.1 %
Miscellaneous weights: 50 tons, 33.4 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 330 lbs / 150 Kg = 692.6 x 1.0 " / 25 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.09
Metacentric height 0.5 ft / 0.1 m
Roll period: 11.4 seconds
Steadiness - As gun platform (Average = 50 %): 41 %
- Recoil effect (Restricted arc if above 1.00): 0.01
Seaboat quality (Average = 1.00): 1.13

Hull form characteristics:

Hull has a flush deck
Block coefficient: 0.464
Length to Beam Ratio: 6.32 : 1
'Natural speed' for length: 10.87 kts
Power going to wave formation at top speed: 64 %
Trim (Max stability = 0, Max steadiness = 100): 30
Bow angle (Positive = bow angles forward): 18.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 11.81 ft / 3.60 m
- Forecastle (20 %): 11.81 ft / 3.60 m
- Mid (30 %): 11.81 ft / 3.60 m
- Quarterdeck (40 %): 4.92 ft / 1.50 m
- Stern: 4.92 ft / 1.50 m
- Average freeboard: 8.02 ft / 2.45 m
Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 82.8 %
- Above water (accommodation/working, high = better): 125.3 %
Waterplane Area: 1,425 Square feet or 132 Square metres
Displacement factor (Displacement / loading): 161 %
Structure weight / hull surface area: 24 lbs/sq ft or 115 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.82
- Longitudinal: 6.02
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent

Breakdown of Miscellaneous Weight

50 tons reserved for minesweeping gear, paravanes, etc.

You have stolen my ship !!!!!

It's my FUSHUN - Class



Fushun - Class
Coastal Minesweeper

Displacement:
113 t light; 119 t standard; 127 t normal; 134 t full load

Dimensions:
Length overall / water x beam x draught
124.77 ft / 120.73 ft x 18.77 ft x 4.92 ft (normal load)
38.03 m / 36.80 m x 5.72 m x 1.50 m

Armament:
2 - 1.77" / 45.0 mm guns in single mounts, 2.78lbs / 1.26kg shells, 1938 Model
Anti-aircraft guns in deck mounts
on centreline ends, evenly spread
2 - 0.50" / 12.7 mm guns (1x2 guns), 0.06lbs / 0.03kg shells, 1938 Model
Anti-aircraft guns in deck mount
on centreline amidships, all raised guns - superfiring
Weight of broadside 6 lbs / 3 kg
Shells per gun, main battery: 1,000

Armour:
- Conning tower: 0.31" / 8 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 3 shafts, 575 shp / 429 Kw = 16.20 kts
Range 2,500nm at 10.00 kts
Bunker at max displacement = 15 tons

Complement:
18 - 24

Cost:
£0.038 million / $0.153 million

Distribution of weights at normal displacement:
Armament: 1 tons, 0.6%
Armour: 0 tons, 0.1%
- Belts: 0 tons, 0.0%
- Torpedo bulkhead: 0 tons, 0.0%
- Armament: 0 tons, 0.0%
- Armour Deck: 0 tons, 0.0%
- Conning Tower: 0 tons, 0.1%
Machinery: 16 tons, 12.4%
Hull, fittings & equipment: 62 tons, 48.4%
Fuel, ammunition & stores: 14 tons, 11.1%
Miscellaneous weights: 35 tons, 27.5%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
318 lbs / 144 Kg = 114.4 x 1.8 " / 45 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.09
Metacentric height 0.5 ft / 0.1 m
Roll period: 11.4 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.04
Seaboat quality (Average = 1.00): 1.73

Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.400
Length to Beam Ratio: 6.43 : 1
'Natural speed' for length: 13.25 kts
Power going to wave formation at top speed: 61 %
Trim (Max stability = 0, Max steadiness = 100): 29
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 11.09 ft / 3.38 m
- Forecastle (20%): 10.50 ft / 3.20 m
- Mid (50%): 10.50 ft / 3.20 m (6.56 ft / 2.00 m aft of break)
- Quarterdeck (15%): 6.56 ft / 2.00 m
- Stern: 6.56 ft / 2.00 m
- Average freeboard: 8.58 ft / 2.61 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 77.3%
- Above water (accommodation/working, high = better): 128.3%
Waterplane Area: 1,447 Square feet or 134 Square metres
Displacement factor (Displacement / loading): 176%
Structure weight / hull surface area: 22 lbs/sq ft or 109 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.79
- Longitudinal: 7.85
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

It certainly wasn't deliberate.

I had found a drawing of a Soviet T.301 class motor minesweeper that I was able to clean up and tried doing a backsim from the T.301 class dimensions.

Please accept my apologies for my ignorance.

no problem ....

May be i can use your picture ??!?!?! So your work wasn't for the Dustbin

Quoted

Originally posted by parador
no problem ....

May be i can use your picture ??!?!?! So your work wasn't for the Dustbin

Please feel free to do so!

And the work is not in vain; I've been doing these projects to better learn to Springsharp, and to generate some comments on design theory. It has been enlightening.