WesWorld

Irish Light Combatants
(Merged from two previous categories.)

Image originally by thesmilingassassin and modified by me.

M-1-class Motor Torpedo Boat (Mótar-Bád Toirpéad)
Length: 110 feet (33.53m)
Beam: 17 feet (5.18m)
Draft: 5 feet (1.52m)
Tonnage: 75 tons light
Speed: 40 knots
Range: 750 miles at speed
Engines: 3 B+W Marine Diesels (Danish), running 3 shafts
Weapons: 20mm Oerlikon in mount aft; 4x .50 cal Vickers .50cal in twin mounts (gun tubs) abaft bridge; 2x 533cm torpedo tubes
Crew: 20 men
Vessels: M-1, M-2, M-3, M-4, M-5, M-6, M-7, M-8, M-9, M-10, M-11, M-12, M-13, M-14, M-15, M-16

Drawing originally by Wes/thesmilingassassin and modified by me.

BGM1-class Fast Gunboat (Bád Gunnaí Móra)
Length: 118.1 feet (36m)
Beam: 19.7 feet (6m)
Draft: 5.74 feet (1.75m)
Tonnage: 90 tons light
Speed: 36 knots light, 33 knots full load
Range: 650 miles at speed
Engines: 3 B+W Marine Diesels (Danish), running 3 shafts
Weapons:
-- Three 40mm Bofors;
-- 4x .30cal or .50cal Vickers amidships
-- 2x 533cm (21") torpedo tubes
Crew: 32 men
Vessels: BGM-1, BGM-2, BGM-3, BGM-4, BGM-5, BGM-6, BGM-7, BGM-8, BGM-9, BGM-10, BGM-11, BGM-12, BGM-13, BGM-14, BGM-15, BGM-16

Image originally by thesmilingassassin and modified by me.

SF/LF-164t, Irish Subchaser/Light Minesweeper laid down 1936

Displacement:
148 t light; 153 t standard; 164 t normal; 173 t full load

Dimensions: Length overall / water x beam x draught
145.53 ft / 134.51 ft x 19.36 ft x 5.58 ft (normal load)
44.36 m / 41.00 m x 5.90 m x 1.70 m

Armament:
1 - 1.57" / 40.0 mm guns in single mounts, 1.95lbs / 0.88kg shells, 1936 Model
Anti-aircraft gun in deck mount
on centreline forward
2 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1936 Model
Anti-aircraft guns in deck mounts
on side, all amidships
1 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1936 Model
Anti-aircraft gun in deck mount
on centreline aft
Weight of broadside 3 lbs / 1 kg
Shells per gun, main battery: 650

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.50" / 13 mm 0.50" / 13 mm -
2nd: 0.50" / 13 mm - -

- Conning tower: 0.50" / 13 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 1,514 shp / 1,129 Kw = 19.00 kts
Range 2,500nm at 10.00 kts
Bunker at max displacement = 19 tons

Complement:
22 - 29

Cost:
£0.060 million / $0.241 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.2 %
Armour: 1 tons, 0.6 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 1 tons, 0.4 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.2 %
Machinery: 42 tons, 25.9 %
Hull, fittings & equipment: 85 tons, 51.7 %
Fuel, ammunition & stores: 15 tons, 9.4 %
Miscellaneous weights: 20 tons, 12.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
310 lbs / 141 Kg = 158.8 x 1.6 " / 40 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 0.5 ft / 0.2 m
Roll period: 11.3 seconds
Steadiness - As gun platform (Average = 50 %): 55 %
- Recoil effect (Restricted arc if above 1.00): 0.02
Seaboat quality (Average = 1.00): 1.63

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.395
Length to Beam Ratio: 6.95 : 1
'Natural speed' for length: 11.60 kts
Power going to wave formation at top speed: 66 %
Trim (Max stability = 0, Max steadiness = 100): 34
Bow angle (Positive = bow angles forward): 40.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 13.12 ft / 4.00 m
- Forecastle (20 %): 11.48 ft / 3.50 m
- Mid (50 %): 9.02 ft / 2.75 m
- Quarterdeck (15 %): 8.20 ft / 2.50 m
- Stern: 8.20 ft / 2.50 m
- Average freeboard: 9.75 ft / 2.97 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 100.1 %
- Above water (accommodation/working, high = better): 129.7 %
Waterplane Area: 1,598 Square feet or 148 Square metres
Displacement factor (Displacement / loading): 151 %
Structure weight / hull surface area: 24 lbs/sq ft or 118 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.77
- Longitudinal: 10.01
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Breakdown of Weights:
-20t for depth charges (LF-class)
-20t for minesweeping gear (SF-class)

Vessels in class:
In Minesweeper configuration
- LÉ Aisling (SF-1) (sold to Britain 1941)
- LÉ Emer (SF-2) (sold to Britain 1941)
- LÉ Fola (SF-3) (sold to Britain 1941)
- LÉ Banba (SF-4) (sold to Britain 1941)
- LÉ Maeve (SF-5) (sold to Britain 1941)
- LÉ Cliona (SF-6) (sold to Britain 1941)
- LÉ Fand (SF-7) (sold to Britain 1941)
- LÉ Ness (SF-8) (sold to Britain 1941)

In Subchaser configuration
- LÉ Orla (LF-1)
- LÉ Etain (LF-2)
- LÉ Macha (LF-3)
- LÉ Achall (LF-4)
- LÉ Roisin (LF-5)
- LÉ Scathach (LF-6)
- LÉ Uathach (LF-7)
- LÉ Ciara (LF-8)

Notes and Comments:
The Aisling-class minesweepers are small minesweepers designed for use in shallow coastal conditions. The ships are designed to be easily converted to serve as submarine chasers, depending upon the needs of the Naval Service.

Dublin-class, Irish Subchaser laid down 1943
The Dublin-class subchasers were designed to improve upon and replace the lightweight Aisling/Orla class minesweeper-subchaser class.

Displacement:
250 t light; 260 t standard; 306 t normal; 343 t full load

Dimensions: Length overall / water x beam x draught
176.93 ft / 171.42 ft x 21.33 ft x 7.22 ft (normal load)
53.93 m / 52.25 m x 6.50 m x 2.20 m

Armament:
1 - 3.70" / 94.0 mm guns in single mounts, 25.33lbs / 11.49kg shells, 1943 Model
Dual purpose gun in deck mount
on centreline forward
2 - 1.57" / 40.0 mm guns in single mounts, 1.95lbs / 0.89kg shells, 1943 Model
Anti-aircraft guns in deck mounts
on centreline, all aft
6 - 0.50" / 12.7 mm guns (2x3 guns), 0.06lbs / 0.03kg shells, 1943 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 30 lbs / 13 kg
Shells per gun, main battery: 220

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 2,899 shp / 2,163 Kw = 20.90 kts
Range 3,500nm at 14.00 kts
Bunker at max displacement = 83 tons

Complement:
36 - 47

Cost:
£0.146 million / $0.585 million

Distribution of weights at normal displacement:
Armament: 4 tons, 1.2 %
Machinery: 75 tons, 24.5 %
Hull, fittings & equipment: 136 tons, 44.6 %
Fuel, ammunition & stores: 56 tons, 18.3 %
Miscellaneous weights: 35 tons, 11.4 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
451 lbs / 205 Kg = 17.8 x 3.7 " / 94 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.09
Metacentric height 0.6 ft / 0.2 m
Roll period: 11.7 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.14
Seaboat quality (Average = 1.00): 1.39

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.406
Length to Beam Ratio: 8.04 : 1
'Natural speed' for length: 13.09 kts
Power going to wave formation at top speed: 63 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 15.00 degrees
Stern overhang: 1.64 ft / 0.50 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 14.44 ft / 4.40 m
- Forecastle (20 %): 9.15 ft / 2.79 m
- Mid (50 %): 9.19 ft / 2.80 m
- Quarterdeck (15 %): 9.19 ft / 2.80 m
- Stern: 9.19 ft / 2.80 m
- Average freeboard: 9.60 ft / 2.93 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 102.0 %
- Above water (accommodation/working, high = better): 109.7 %
Waterplane Area: 2,258 Square feet or 210 Square metres
Displacement factor (Displacement / loading): 143 %
Structure weight / hull surface area: 30 lbs/sq ft or 145 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.83
- Longitudinal: 5.25
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

Breakdown of Miscellaneous Weights:
- 5 tons for surface-search radar
- 5 tons for 32x 340lb depth charges
- 5 tons for paravanes and minesweeping gear
- 20 tons for growth

Ships in Class:
- LÉ Dublin (LF-09): Laid down October 1943.
- LÉ Cork (LF-10): Laid down January 1944.
- LÉ Limerick (LF-11): Laid down April 1944.
- LÉ Galway (LF-12): Laid down July 1944.
- LÉ Waterford (LF-13): Laid down October 1944.
- LÉ Drogheda (LF-14): Laid down January 1945.
- LÉ Dundalk (LF-15): Laid down April 1945.
- LÉ Swords (LF-16): Laid down July 1945.