WesWorld

Bres-class Tugs
- LÉ Bres (YTB-1) - 1937
- LÉ Nuada (YTB-2) - 1937

Meath-class Fleet Tender
- LÉ Meath (FT-01) - 1937

Carrauntoohil-class Net-Layers/Boom Defense Vessel
- LÉ Carrauntoohil - 1937

Banba-class Replenishment Ship
- LÉ Banba (FT-02) - 1942

Slieve League-class Utility Ship
- LÉ Slieve League - 1942

Summary
The Irish Naval Service currently operates two 150-ton tugs, a fleet tender, and a boom defense vessel, one fleet resupply ship, and one utility landing craft as armed auxiliaries.

The Bres and Nuada are designed primarily as military tugboats suitable for open-sea work. During times of crisis, they may also serve as impromptu harbor-defense vessels and minesweepers.

Bres-class, Irish Naval Tugboat/AA Defense laid down 1937

Displacement:
150 t light; 155 t standard; 186 t normal; 211 t full load

Dimensions: Length overall / water x beam x draught
90.25 ft / 90.25 ft x 20.00 ft x 8.75 ft (normal load)
27.51 m / 27.51 m x 6.10 m x 2.67 m

Armament:
2 - 1.57" / 40.0 mm guns (1x2 guns), 1.95lbs / 0.88kg shells, 1937 Model
Anti-aircraft guns in deck mount
on centreline forward
2 - 0.79" / 20.0 mm guns (1x2 guns), 0.24lbs / 0.11kg shells, 1937 Model
Anti-aircraft guns in deck mount
on centreline aft
Weight of broadside 4 lbs / 2 kg
Shells per gun, main battery: 500

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.79" / 20 mm 0.39" / 10 mm -

Machinery:
Diesel Internal combustion generators,
Electric motors, 2 shafts, 250 shp / 187 Kw = 12.00 kts
Range 4,500nm at 12.00 kts
Bunker at max displacement = 55 tons

Complement:
24 - 32

Cost:
£0.036 million / $0.146 million

Distribution of weights at normal displacement:
Armament: 1 tons, 0.3 %
Armour: 1 tons, 0.5 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 1 tons, 0.5 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 7 tons, 3.7 %
Hull, fittings & equipment: 122 tons, 65.5 %
Fuel, ammunition & stores: 36 tons, 19.3 %
Miscellaneous weights: 20 tons, 10.8 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
860 lbs / 390 Kg = 440.4 x 1.6 " / 40 mm shells or 1.5 torpedoes
Stability (Unstable if below 1.00): 1.09
Metacentric height 0.5 ft / 0.2 m
Roll period: 11.6 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.02
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.412
Length to Beam Ratio: 4.51 : 1
'Natural speed' for length: 11.89 kts
Power going to wave formation at top speed: 60 %
Trim (Max stability = 0, Max steadiness = 100): 25
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: 12.00 ft / 3.66 m
- Forecastle (20 %): 10.00 ft / 3.05 m
- Mid (50 %): 8.00 ft / 2.44 m
- Quarterdeck (15 %): 8.00 ft / 2.44 m
- Stern: 8.00 ft / 2.44 m
- Average freeboard: 8.86 ft / 2.70 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 28.3 %
- Above water (accommodation/working, high = better): 78.0 %
Waterplane Area: 1,162 Square feet or 108 Square metres
Displacement factor (Displacement / loading): 475 %
Structure weight / hull surface area: 51 lbs/sq ft or 248 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.60
- Longitudinal: 28.73
- Overall: 2.13
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is cramped
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Ships in Class:
- LÉ Bres (YTB-1)
- LÉ Nuada (YTB-2)

Drawing originally by thesmilingassassin and modified heavily by me.

LÉ Meath, Irish Fleet Tender laid down 1937

Displacement:
1,800 t light; 1,858 t standard; 2,061 t normal; 2,224 t full load

Dimensions: Length overall / water x beam x draught
308.75 ft / 303.48 ft x 42.65 ft x 13.12 ft (normal load)
94.11 m / 92.50 m x 13.00 m x 4.00 m

Armament:
4 - 3.70" / 94.0 mm guns (2x2 guns), 25.33lbs / 11.49kg shells, 1937 Model
Dual purpose guns in deck mounts
on centreline ends, evenly spread
4 - 1.57" / 40.0 mm guns (2x2 guns), 1.95lbs / 0.89kg shells, 1937 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
4 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1937 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 110 lbs / 50 kg
Shells per gun, main battery: 250

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.79" / 20 mm 0.59" / 15 mm -
2nd: 0.39" / 10 mm - -
3rd: 0.39" / 10 mm - -

- Conning tower: 0.79" / 20 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 6,540 shp / 4,878 Kw = 21.00 kts
Range 6,000nm at 13.50 kts
Bunker at max displacement = 366 tons

Complement:
152 - 198

Cost:
£0.545 million / $2.181 million

Distribution of weights at normal displacement:
Armament: 14 tons, 0.7 %
Armour: 10 tons, 0.5 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 7 tons, 0.3 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 3 tons, 0.1 %
Machinery: 181 tons, 8.8 %
Hull, fittings & equipment: 796 tons, 38.6 %
Fuel, ammunition & stores: 261 tons, 12.7 %
Miscellaneous weights: 800 tons, 38.8 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
3,511 lbs / 1,592 Kg = 138.6 x 3.7 " / 94 mm shells or 1.2 torpedoes
Stability (Unstable if below 1.00): 1.07
Metacentric height 1.6 ft / 0.5 m
Roll period: 14.2 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.04
Seaboat quality (Average = 1.00): 1.51

Hull form characteristics:
Hull has low quarterdeck
and transom stern
Block coefficient: 0.425
Length to Beam Ratio: 7.12 : 1
'Natural speed' for length: 20.70 kts
Power going to wave formation at top speed: 52 %
Trim (Max stability = 0, Max steadiness = 100): 33
Bow angle (Positive = bow angles forward): 15.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 19.69 ft / 6.00 m
- Forecastle (20 %): 13.12 ft / 4.00 m
- Mid (50 %): 13.12 ft / 4.00 m
- Quarterdeck (15 %): 9.84 ft / 3.00 m (13.12 ft / 4.00 m before break)
- Stern: 9.84 ft / 3.00 m
- Average freeboard: 13.16 ft / 4.01 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 76.9 %
- Above water (accommodation/working, high = better): 138.2 %
Waterplane Area: 8,406 Square feet or 781 Square metres
Displacement factor (Displacement / loading): 161 %
Structure weight / hull surface area: 62 lbs/sq ft or 304 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.05
- Longitudinal: 2.46
- Overall: 1.14
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:
- 50 tons for spare DC
- 50 tons for torpedo reloads
- 150 tons for extra other ammo
- 50 tons for machine shop
- 400 tons for parts and supplies (consumables)
- 100 tons for extra crew bunks and liveability

Ships in Class:
- LE Meath - 1937

Notes:

Carrauntoohil, Irish Net-laying Ship/Boom Defense Vessel laid down 1937

Displacement:
400 t light; 418 t standard; 565 t normal; 682 t full load

Dimensions: Length overall / water x beam x draught
157.00 ft / 151.00 ft x 30.50 ft x 10.50 ft (normal load)
47.85 m / 46.02 m x 9.30 m x 3.20 m

Armament:
1 - 3.70" / 94.0 mm guns in single mounts, 25.34lbs / 11.50kg shells, 1937 Model
Dual purpose gun in deck mount
on centreline aft
4 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1937 Model
Machine guns in deck mounts
on side, all amidships
Weight of broadside 26 lbs / 12 kg
Shells per gun, main battery: 425

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.18" / 30 mm 0.39" / 10 mm -
2nd: 0.79" / 20 mm - -

- Conning tower: 0.79" / 20 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 1,235 shp / 922 Kw = 15.00 kts
Range 5,500nm at 15.00 kts
Bunker at max displacement = 264 tons

Complement:
57 - 75

Cost:
£0.118 million / $0.471 million

Distribution of weights at normal displacement:
Armament: 3 tons, 0.6 %
Armour: 3 tons, 0.6 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 2 tons, 0.4 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 1 tons, 0.2 %
Machinery: 34 tons, 6.1 %
Hull, fittings & equipment: 250 tons, 44.2 %
Fuel, ammunition & stores: 165 tons, 29.1 %
Miscellaneous weights: 110 tons, 19.5 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,421 lbs / 645 Kg = 56.1 x 3.7 " / 94 mm shells or 1.2 torpedoes
Stability (Unstable if below 1.00): 1.13
Metacentric height 1.1 ft / 0.3 m
Roll period: 12.4 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.03
Seaboat quality (Average = 1.00): 1.47

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.409
Length to Beam Ratio: 4.95 : 1
'Natural speed' for length: 12.29 kts
Power going to wave formation at top speed: 57 %
Trim (Max stability = 0, Max steadiness = 100): 48
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: 13.52 ft / 4.12 m
- Forecastle (20 %): 8.60 ft / 2.62 m
- Mid (50 %): 8.60 ft / 2.62 m
- Quarterdeck (15 %): 8.60 ft / 2.62 m
- Stern: 8.60 ft / 2.62 m
- Average freeboard: 8.99 ft / 2.74 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 47.4 %
- Above water (accommodation/working, high = better): 81.9 %
Waterplane Area: 2,850 Square feet or 265 Square metres
Displacement factor (Displacement / loading): 271 %
Structure weight / hull surface area: 55 lbs/sq ft or 269 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.31
- Longitudinal: 6.23
- Overall: 1.53
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

Breakdown of Miscellaneous Weights:
- 100 tons for netlaying equipment
- 10 tons for hydrophones and associated ASW fit

Ships in Class:
- LE Carrauntoohil - 1937

Notes:

Banba, Irish Underway Replenishment Oiler laid down 1942

Displacement:
2,536 t light; 2,702 t standard; 5,587 t normal; 7,895 t full load

Dimensions: Length overall / water x beam x draught
400.54 ft / 393.70 ft x 50.20 ft x 17.06 ft (normal load)
122.08 m / 120.00 m x 15.30 m x 5.20 m

Armament:
4 - 3.70" / 94.0 mm guns (2x2 guns), 25.33lbs / 11.49kg shells, 1942 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, evenly spread
12 - 0.79" / 20.0 mm guns (6x2 guns), 0.24lbs / 0.11kg shells, 1942 Model
Machine guns in deck mounts
on side, all amidships
Weight of broadside 104 lbs / 47 kg
Shells per gun, main battery: 900

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.59" / 15 mm -
2nd: 0.59" / 15 mm 0.39" / 10 mm -

Machinery:
Diesel Internal combustion generators,
Electric motors, 1 shaft, 3,920 shp / 2,924 Kw = 15.00 kts
Range 36,000nm at 15.00 kts
Bunker at max displacement = 5,193 tons

Complement:
323 - 420

Cost:
£0.726 million / $2.903 million

Distribution of weights at normal displacement:
Armament: 13 tons, 0.2 %
Armour: 9 tons, 0.2 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 9 tons, 0.2 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 102 tons, 1.8 %
Hull, fittings & equipment: 1,412 tons, 25.3 %
Fuel, ammunition & stores: 3,051 tons, 54.6 %
Miscellaneous weights: 1,000 tons, 17.9 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
21,033 lbs / 9,540 Kg = 830.5 x 3.7 " / 94 mm shells or 5.2 torpedoes
Stability (Unstable if below 1.00): 1.41
Metacentric height 3.2 ft / 1.0 m
Roll period: 11.7 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.03
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has raised forecastle, raised quarterdeck
Block coefficient: 0.580
Length to Beam Ratio: 7.84 : 1
'Natural speed' for length: 19.84 kts
Power going to wave formation at top speed: 33 %
Trim (Max stability = 0, Max steadiness = 100): 35
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 2.50 ft / 0.76 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24.61 ft / 7.50 m
- Forecastle (20 %): 19.69 ft / 6.00 m (12.47 ft / 3.80 m aft of break)
- Mid (50 %): 12.47 ft / 3.80 m
- Quarterdeck (20 %): 19.69 ft / 6.00 m (12.47 ft / 3.80 m before break)
- Stern: 19.69 ft / 6.00 m
- Average freeboard: 15.75 ft / 4.80 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 29.6 %
- Above water (accommodation/working, high = better): 101.7 %
Waterplane Area: 13,830 Square feet or 1,285 Square metres
Displacement factor (Displacement / loading): 424 %
Structure weight / hull surface area: 64 lbs/sq ft or 314 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.97
- Longitudinal: 1.49
- Overall: 1.01
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Breakdown of Miscellaneous Weights:
- 100 tons for refueling gear
- 900 tons for supplies

Ships in Class:
- LÉ Banba

Slieve League, Irish Utility Ship laid down 1942

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