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1

Wednesday, July 25th 2012, 4:28am

Slieve League

Proposed vessel for moving cargo and men by sea.

Quoted

[SIZE=3]Slieve League, Irish Utility Ship laid down 1942[/SIZE]

Displacement:
523 t light; 540 t standard; 682 t normal; 796 t full load

Dimensions: Length overall / water x beam x draught
197.82 ft / 190.00 ft x 34.00 ft x 6.95 ft (normal load)
60.30 m / 57.91 m x 10.36 m x 2.12 m

Armament:
6 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1942 Model
Machine guns in deck mounts
on centreline ends, evenly spread, all raised mounts - superfiring
Weight of broadside 1 lbs / 1 kg
Shells per gun, main battery: 4,000

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 1,144 shp / 853 Kw = 15.00 kts
Range 6,000nm at 15.00 kts
Bunker at max displacement = 256 tons

Complement:
66 - 86

Cost:
£0.144 million / $0.576 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Machinery: 30 tons, 4.4 %
Hull, fittings & equipment: 243 tons, 35.6 %
Fuel, ammunition & stores: 159 tons, 23.3 %
Miscellaneous weights: 250 tons, 36.6 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
2,094 lbs / 950 Kg = 8,580.4 x 0.8 " / 20 mm shells or 1.2 torpedoes
Stability (Unstable if below 1.00): 1.21
Metacentric height 1.4 ft / 0.4 m
Roll period: 12.0 seconds
Steadiness - As gun platform (Average = 50 %): 64 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 1.74

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.532
Length to Beam Ratio: 5.59 : 1
'Natural speed' for length: 16.49 kts
Power going to wave formation at top speed: 51 %
Trim (Max stability = 0, Max steadiness = 100): 37
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 16.00 ft / 4.88 m
- Forecastle (20 %): 11.00 ft / 3.35 m
- Mid (50 %): 11.00 ft / 3.35 m
- Quarterdeck (15 %): 11.00 ft / 3.35 m
- Stern: 11.00 ft / 3.35 m
- Average freeboard: 11.40 ft / 3.47 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 55.8 %
- Above water (accommodation/working, high = better): 146.5 %
Waterplane Area: 4,613 Square feet or 429 Square metres
Displacement factor (Displacement / loading): 219 %
Structure weight / hull surface area: 37 lbs/sq ft or 181 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.89
- Longitudinal: 2.84
- 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

Breakdown of Miscellaneous Weights:
- 250 tons for cargo, tanks, infantry, mines, etc.

2

Wednesday, July 25th 2012, 4:34am

An interesting and handy-looking design. Certainly capable of handling the sea states likely to be encountred in Irish waters. Bow doors I presume?

3

Wednesday, July 25th 2012, 7:19am

Yes, I think I'd prefer bow doors, but most ships I've spotted in this size category actually just have a ramp.

4

Wednesday, July 25th 2012, 10:17pm

An interesting little ship, one that the INS will find very useful.

The AA layout is odd, all six on the centreline.

5

Wednesday, July 25th 2012, 10:19pm

Quoted

Originally posted by Hood
The AA layout is odd, all six on the centreline.

Oops...

6

Wednesday, July 25th 2012, 11:00pm

Fixed the armament.

Quoted

[SIZE=3]Slieve League, Irish Utility Ship laid down 1942[/SIZE]

Displacement:
525 t light; 545 t standard; 688 t normal; 803 t full load

Dimensions: Length overall / water x beam x draught
197.82 ft / 190.00 ft x 34.00 ft x 6.95 ft (normal load)
60.30 m / 57.91 m x 10.36 m x 2.12 m

Armament:
2 - 0.79" / 20.0 mm guns (1x2 guns), 0.24lbs / 0.11kg shells, 1942 Model
Machine guns in deck mount
on centreline forward, all raised guns
4 - 0.79" / 20.0 mm guns (2x2 guns), 0.24lbs / 0.11kg shells, 1942 Model
Machine guns in deck mounts
on side, all aft, all raised mounts - superfiring
Weight of broadside 1 lbs / 1 kg
Shells per gun, main battery: 4,000

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 1,153 shp / 860 Kw = 15.00 kts
Range 6,000nm at 15.00 kts
Bunker at max displacement = 258 tons

Complement:
66 - 87

Cost:
£0.145 million / $0.579 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Machinery: 30 tons, 4.4 %
Hull, fittings & equipment: 245 tons, 35.6 %
Fuel, ammunition & stores: 163 tons, 23.7 %
Miscellaneous weights: 250 tons, 36.3 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
2,112 lbs / 958 Kg = 8,651.8 x 0.8 " / 20 mm shells or 1.2 torpedoes
Stability (Unstable if below 1.00): 1.21
Metacentric height 1.4 ft / 0.4 m
Roll period: 12.0 seconds
Steadiness - As gun platform (Average = 50 %): 64 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 1.73

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.537
Length to Beam Ratio: 5.59 : 1
'Natural speed' for length: 16.48 kts
Power going to wave formation at top speed: 52 %
Trim (Max stability = 0, Max steadiness = 100): 37
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 16.00 ft / 4.88 m
- Forecastle (20 %): 11.00 ft / 3.35 m
- Mid (50 %): 11.00 ft / 3.35 m
- Quarterdeck (15 %): 11.00 ft / 3.35 m
- Stern: 11.00 ft / 3.35 m
- Average freeboard: 11.40 ft / 3.47 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 55.8 %
- Above water (accommodation/working, high = better): 147.1 %
Waterplane Area: 4,633 Square feet or 430 Square metres
Displacement factor (Displacement / loading): 221 %
Structure weight / hull surface area: 37 lbs/sq ft or 182 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.89
- Longitudinal: 2.84
- 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

7

Wednesday, July 25th 2012, 11:07pm

Much better layout. ;)