WesWorld

Overview
The Irish Naval Service will continue its growth into a regional coast-patrol, minesweeping, and ASW-centric force. Per the current design philosophy, the INS commissions one to two lead ships in each class, building them to completion and analyzing the design for several quarters before ordering further improved sister ships.

Currently, the INS consists of two fisheries protection vessels or Frigates, four light minesweepers, and two motor torpedo boats. A new destroyer is nearing completion, and will be finished in Q1 of 1937.

New Construction
The INS will be laying down two more Deirdre-class fisheries patrol vessels (given the hull number "F" for Frigate) in 1937. These two vessels will be named LÉ Grainne and LÉ Niamh, and assigned hull numbers F-3 and F-4. Further examples of this class are uncertain at present, as these vessels are not intended as warships, and the four Deirdres meet the needs of the Fisheries Service. It is possible that a further frigate design will be built in the future, but this will almost certainly be built to a new design.

The completion of the LÉ Connacht in 1937 will be followed by a period of working-up, while the INS evaluates ordering a further three examples of the class. When ordered, these vessels will be known as the Cúige or "Provinces" class, named after the four current provinces of Ireland: Ulster, Munster, Leinster, and Connacht. If Connacht shows no fatal flaws upon completion, her three sister ships will be ordered in late 1937, bearing the hull numbers S2. S3, and S4.

Development of the coastal minesweeper and motor torpedo boat flotillas will continue. Seven further examples of the Aisling-class minesweeper will be produced, as the vessels are small, inexpensive, easy to crew, and can be manned easily by fresh recruits familiar with trawler operations. In April 1937, more M1-class MTBs will be ordered, to the tune of six vessels in 1937.

To accompany the arrival of destroyers and frigates, the INS will also order the LÉ Meath, a Flotilla tender of approximately 2,000 tons. The Meath, despite it's noncombat role, will be the heaviest vessel in the Irish Naval Service. It will provide tender services, light repair, extra crew accommodations, and command, communications, and control capabilities to the fleet.

Finally, with the expected arrival of more large ships in the INS, two dedicated military tugs will be built to aid in ship operations. These tugs will have seagoing capabilities, and as they will be operated by the INS, will feature light armament suitable for driving off hostile aircraft or motor torpedo boats. (In practice, this armament will most likely be left at the dock.)

New Purchases
The INS will purchase four S-class destroyers from Great Britain early in 1937, and refit them heavily into modern oceanic escorts. These acquisitions will be dubbed Contae-class Destroyer Escorts and assigned the hull numbers S-5 through S-8, being named after four of the counties of Ireland. These refitted vessels are expected to have a useful further service life of between eight to ten years, after which their roles will be reevaluated. One of the vessels will probably be assigned as a schoolship for the INS.

[SIZE=1]Drawing originally by thesmilingassassin and modified heavily by me.[/SIZE]

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

I like that tender a lot. Is she based on a historical design?

Her BC might be a little low for a tender ship which will be more like a merchant, I think, but I may be wrong. It´s not really an issue, though.

Grainne, Ireland Fisheries Protection Sloop laid down 1937

Displacement:
473 t light; 492 t standard; 580 t normal; 650 t full load

Dimensions: Length overall / water x beam x draught
230.00 ft / 223.81 ft x 35.00 ft x 8.00 ft (normal load)
70.10 m / 68.22 m x 10.67 m x 2.44 m

Armament:
2 - 3.70" / 94.0 mm guns (1x2 guns), 25.33lbs / 11.49kg shells, 1937 Model
Dual purpose guns in deck mount
on centreline forward
4 - 0.79" / 20.0 mm guns (2x2 guns), 0.24lbs / 0.11kg shells, 1937 Model
Anti-aircraft guns in deck mounts
on centreline, evenly spread, all raised mounts
4 - 0.50" / 12.7 mm guns (2x2 guns), 0.06lbs / 0.03kg shells, 1937 Model
Anti-aircraft guns in deck mounts
on centreline, evenly spread, all raised mounts
Weight of broadside 52 lbs / 24 kg
Shells per gun, main battery: 250

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.57" / 40 mm 0.79" / 20 mm -
2nd: 0.79" / 20 mm 0.39" / 10 mm -
3rd: 0.59" / 15 mm 0.39" / 10 mm -

- Conning tower: 0.79" / 20 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 3,693 shp / 2,755 Kw = 22.00 kts
Range 4,400nm at 15.00 kts
Bunker at max displacement = 158 tons

Complement:
58 - 76

Cost:
£0.198 million / $0.793 million

Distribution of weights at normal displacement:
Armament: 6 tons, 1.1 %
Armour: 7 tons, 1.3 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 6 tons, 1.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 1 tons, 0.2 %
Machinery: 102 tons, 17.6 %
Hull, fittings & equipment: 327 tons, 56.4 %
Fuel, ammunition & stores: 107 tons, 18.4 %
Miscellaneous weights: 30 tons, 5.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,845 lbs / 837 Kg = 72.8 x 3.7 " / 94 mm shells or 0.9 torpedoes
Stability (Unstable if below 1.00): 1.22
Metacentric height 1.5 ft / 0.5 m
Roll period: 12.1 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.06
Seaboat quality (Average = 1.00): 1.55

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.324
Length to Beam Ratio: 6.39 : 1
'Natural speed' for length: 18.36 kts
Power going to wave formation at top speed: 58 %
Trim (Max stability = 0, Max steadiness = 100): 45
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: 17.00 ft / 5.18 m
- Forecastle (20 %): 13.00 ft / 3.96 m
- Mid (50 %): 13.00 ft / 3.96 m
- Quarterdeck (15 %): 13.00 ft / 3.96 m
- Stern: 13.00 ft / 3.96 m
- Average freeboard: 13.32 ft / 4.06 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 72.9 %
- Above water (accommodation/working, high = better): 213.6 %
Waterplane Area: 5,004 Square feet or 465 Square metres
Displacement factor (Displacement / loading): 197 %
Structure weight / hull surface area: 42 lbs/sq ft or 206 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.84
- Longitudinal: 5.15
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Breakdown of Weights:
20 tons for Depth Charges (war load)
10 tons for Hydrophones

Notes:
Very light upgrade of Deirdre-class Fisheries Protection Vessels/Frigates.

Quoted

Originally posted by HoOmAn
I like that tender a lot. Is she based on a historical design?

Her BC might be a little low for a tender ship which will be more like a merchant, I think, but I may be wrong. It´s not really an issue, though.

I drew her up based on the bare-bones specs of the German Hela Fleet Tender from OTL Kriegsmarine. The drawing got shifted about a bit due to my parts list, but I called it close enough.

Meath has a bit different dimensions and a lighter weight than the Hela... I had some difficulties achieving my usual design goals on Hela's hull and specs, so I'm pretty open to making changes at this point.

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.

[SIZE=3]Bres-class, Irish Naval Tugboat/AA Defense laid down 1937[/SIZE]

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

[SIZE=3]Ships in Class:[/SIZE]
- LÉ Bres (YTB-1)
- LÉ Nuada (YTB-2)

You realise that in a filipino design, the misc weight is either TNT or Aviation fuel with a couple of smoking penguins for good measure

[SIZE=1]Drawing originally by thesmilingassassin and modified heavily by me.[/SIZE]

This is my sim of the "original" S-class destroyer - there is no SS file that I know of for an S-class; it breaks some of the gentleman's rules but it was the only way I could get the stats to fit the known starting tonnage.

Quoted

S-class Destroyer, British Destroyer laid down 1917

Displacement:
964 t light; 993 t standard; 1,075 t normal; 1,141 t full load

Dimensions: Length overall / water x beam x draught
280.06 ft / 276.00 ft x 26.75 ft x 10.80 ft (normal load)
85.36 m / 84.12 m x 8.15 m x 3.29 m

Armament:
3 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1917 Model
Breech loading guns in deck mounts
on centreline, evenly spread
Aft Main mounts separated by engine room
1 - 1.57" / 40.0 mm guns in single mounts, 1.95lbs / 0.88kg shells, 1917 Model
Quick firing gun in deck mount
on side amidships
4 - 0.30" / 7.7 mm guns in single mounts, 0.01lbs / 0.00kg shells, 1917 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 98 lbs / 44 kg
Shells per gun, main battery: 150
4 - 21.0" / 533.4 mm above water torpedoes

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 32,896 shp / 24,540 Kw = 34.00 kts
Range 5,000nm at 10.00 kts
Bunker at max displacement = 147 tons

Complement:
93 - 122

Cost:
£0.238 million / $0.951 million

Distribution of weights at normal displacement:
Armament: 12 tons, 1.1 %
Machinery: 620 tons, 57.7 %
Hull, fittings & equipment: 331 tons, 30.8 %
Fuel, ammunition & stores: 112 tons, 10.4 %
Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
243 lbs / 110 Kg = 7.6 x 4.0 " / 102 mm shells or 0.2 torpedoes
Stability (Unstable if below 1.00): 1.13
Metacentric height 0.9 ft / 0.3 m
Roll period: 12.0 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.21
Seaboat quality (Average = 1.00): 0.92

Hull form characteristics:
Hull has raised forecastle
and transom stern
Block coefficient: 0.472
Length to Beam Ratio: 10.32 : 1
'Natural speed' for length: 18.98 kts
Power going to wave formation at top speed: 75 %
Trim (Max stability = 0, Max steadiness = 100): 76
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 23.00 ft / 7.01 m
- Forecastle (25 %): 20.00 ft / 6.10 m (13.00 ft / 3.96 m aft of break)
- Mid (50 %): 13.00 ft / 3.96 m
- Quarterdeck (15 %): 13.00 ft / 3.96 m
- Stern: 13.00 ft / 3.96 m
- Average freeboard: 15.05 ft / 4.59 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 194.7 %
- Above water (accommodation/working, high = better): 83.2 %
Waterplane Area: 4,986 Square feet or 463 Square metres
Displacement factor (Displacement / loading): 43 %
Structure weight / hull surface area: 27 lbs/sq ft or 132 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.47
- Longitudinal: 4.41
- Overall: 0.59
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform
Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

And now my conversion schemes, first with the 29-knot diesel option:

Quoted

Contae-class Conversion, Irish Destroyer Escort laid down 1917 (Engine 1937)

Displacement:
878 t light; 925 t standard; 1,075 t normal; 1,196 t full load

Dimensions: Length overall / water x beam x draught
280.06 ft / 276.00 ft x 26.75 ft x 10.80 ft (normal load)
85.36 m / 84.12 m x 8.15 m x 3.29 m

Armament:
6 - 3.70" / 94.0 mm guns (3x2 guns), 25.33lbs / 11.49kg shells, 1937 Model
Dual purpose guns in deck mounts
on centreline, evenly spread
Aft Main mounts separated by engine room
8 - 1.57" / 40.0 mm guns (4x2 guns), 1.95lbs / 0.88kg shells, 1937 Model
Quick firing guns in deck mounts
on side, all amidships, all raised mounts - superfiring
4 - 0.30" / 7.7 mm guns in single mounts, 0.01lbs / 0.00kg shells, 1917 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 168 lbs / 76 kg
Shells per gun, main battery: 250
4 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.97" / 50 mm 0.79" / 20 mm -

- Conning tower: 0.79" / 20 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 16,715 shp / 12,470 Kw = 29.00 kts
Range 5,000nm at 15.00 kts
Bunker at max displacement = 271 tons

Complement:
93 - 122

Cost:
£0.198 million / $0.792 million

Distribution of weights at normal displacement:
Armament: 21 tons, 1.9 %
Armour: 18 tons, 1.7 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 16 tons, 1.5 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 2 tons, 0.2 %
Machinery: 433 tons, 40.3 %
Hull, fittings & equipment: 346 tons, 32.2 %
Fuel, ammunition & stores: 197 tons, 18.3 %
Miscellaneous weights: 60 tons, 5.6 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
461 lbs / 209 Kg = 18.2 x 3.7 " / 94 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.21
Metacentric height 1.0 ft / 0.3 m
Roll period: 11.4 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.34
Seaboat quality (Average = 1.00): 1.44

Hull form characteristics:
Hull has raised forecastle
and transom stern
Block coefficient: 0.472
Length to Beam Ratio: 10.32 : 1
'Natural speed' for length: 18.98 kts
Power going to wave formation at top speed: 68 %
Trim (Max stability = 0, Max steadiness = 100): 49
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 23.00 ft / 7.01 m
- Forecastle (25 %): 20.00 ft / 6.10 m (13.00 ft / 3.96 m aft of break)
- Mid (50 %): 13.00 ft / 3.96 m
- Quarterdeck (15 %): 13.00 ft / 3.96 m
- Stern: 13.00 ft / 3.96 m
- Average freeboard: 15.05 ft / 4.59 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 152.2 %
- Above water (accommodation/working, high = better): 83.2 %
Waterplane Area: 4,986 Square feet or 463 Square metres
Displacement factor (Displacement / loading): 92 %
Structure weight / hull surface area: 28 lbs/sq ft or 137 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.54
- Longitudinal: 4.47
- Overall: 0.67
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

And with the 30-knot turbine option:

Quoted

Contae-class Conversion, Irish Destroyer Escort laid down 1917 (Engine 1937)

Displacement:
885 t light; 931 t standard; 1,082 t normal; 1,203 t full load

Dimensions: Length overall / water x beam x draught
280.06 ft / 276.00 ft x 26.75 ft x 10.80 ft (normal load)
85.36 m / 84.12 m x 8.15 m x 3.29 m

Armament:
6 - 3.70" / 94.0 mm guns (3x2 guns), 25.33lbs / 11.49kg shells, 1937 Model
Dual purpose guns in deck mounts
on centreline, evenly spread
Aft Main mounts separated by engine room
8 - 1.57" / 40.0 mm guns (4x2 guns), 1.95lbs / 0.88kg shells, 1937 Model
Quick firing guns in deck mounts
on side, all amidships, all raised mounts - superfiring
4 - 0.30" / 7.7 mm guns in single mounts, 0.01lbs / 0.00kg shells, 1917 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 168 lbs / 76 kg
Shells per gun, main battery: 250
4 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.97" / 50 mm 0.79" / 20 mm -

- Conning tower: 0.79" / 20 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 19,384 shp / 14,461 Kw = 30.00 kts
Range 5,000nm at 15.00 kts
Bunker at max displacement = 272 tons

Complement:
93 - 122

Cost:
£0.205 million / $0.821 million

Distribution of weights at normal displacement:
Armament: 21 tons, 1.9 %
Armour: 18 tons, 1.7 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 16 tons, 1.5 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 2 tons, 0.2 %
Machinery: 460 tons, 42.5 %
Hull, fittings & equipment: 326 tons, 30.1 %
Fuel, ammunition & stores: 198 tons, 18.3 %
Miscellaneous weights: 60 tons, 5.5 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
390 lbs / 177 Kg = 15.4 x 3.7 " / 94 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.20
Metacentric height 1.0 ft / 0.3 m
Roll period: 11.4 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.34
Seaboat quality (Average = 1.00): 1.30

Hull form characteristics:
Hull has raised forecastle
and transom stern
Block coefficient: 0.475
Length to Beam Ratio: 10.32 : 1
'Natural speed' for length: 18.97 kts
Power going to wave formation at top speed: 70 %
Trim (Max stability = 0, Max steadiness = 100): 54
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 23.00 ft / 7.01 m
- Forecastle (25 %): 20.00 ft / 6.10 m (13.00 ft / 3.96 m aft of break)
- Mid (50 %): 13.00 ft / 3.96 m
- Quarterdeck (15 %): 13.00 ft / 3.96 m
- Stern: 13.00 ft / 3.96 m
- Average freeboard: 15.05 ft / 4.59 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 159.2 %
- Above water (accommodation/working, high = better): 83.4 %
Waterplane Area: 5,000 Square feet or 464 Square metres
Displacement factor (Displacement / loading): 82 %
Structure weight / hull surface area: 26 lbs/sq ft or 129 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 4.17
- Overall: 0.61
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

Quoted

Originally posted by Earl822
You realise that in a filipino design, the misc weight is either TNT or Aviation fuel with a couple of smoking penguins for good measure

Probably.

I just called the miscellaneous weight on my tugs "extra bracing" and "rubber bumpers" and "mission-sensitive equipment".

I like the tender. Its a good design and looks pretty neat too.

One of the former S Class to be transferred will be HMS Shamrock! I'd never intended it as a pun but I noticed it as I wrote out my Q1/37 report.

......But.......

Quoted

Originally posted by Brockpaine
Grainne, Ireland Fisheries Protection Sloop laid down 1937

Block coefficient: 0.324

...seems VERY low!

Whups!

Maybe I got the wrong SS file posted... :/

*Edit* Yup, that's what I did. When my computer started dying a few weeks ago, I saved all of my SS files to my website... but when I restored to the new computer and futzed about with my organization. The original design got substituted for the final, which I posted in the Irish encyclopedia...

This one should be correct:


[SIZE=1]Image originally by thesmilingassassin and creatively edited by me.[/SIZE]

Quoted

Grainne, Ireland Fisheries Protection Sloop laid down 1937

Displacement:
478 t light; 498 t standard; 625 t normal; 727 t full load

Dimensions: Length overall / water x beam x draught
229.19 ft / 223.00 ft x 32.00 ft x 8.00 ft (normal load)
69.86 m / 67.97 m x 9.75 m x 2.44 m

Armament:
2 - 3.70" / 94.0 mm guns (1x2 guns), 25.33lbs / 11.49kg shells, 1937 Model
Dual purpose guns in deck mount
on centreline forward
4 - 0.79" / 20.0 mm guns (2x2 guns), 0.24lbs / 0.11kg shells, 1937 Model
Anti-aircraft guns in deck mounts
on centreline, evenly spread, all raised mounts
4 - 0.50" / 12.7 mm guns (2x2 guns), 0.06lbs / 0.03kg shells, 1937 Model
Anti-aircraft guns in deck mounts
on centreline, evenly spread, all raised mounts
Weight of broadside 52 lbs / 24 kg
Shells per gun, main battery: 250

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.57" / 40 mm 0.79" / 20 mm -
2nd: 0.79" / 20 mm 0.39" / 10 mm -
3rd: 0.59" / 15 mm 0.39" / 10 mm -

- Conning tower: 0.79" / 20 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 4,053 shp / 3,024 Kw = 22.00 kts
Range 6,000nm at 15.00 kts
Bunker at max displacement = 228 tons

Complement:
62 - 81

Cost:
£0.207 million / $0.827 million

Distribution of weights at normal displacement:
Armament: 6 tons, 1.0 %
Armour: 7 tons, 1.2 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 6 tons, 1.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 1 tons, 0.2 %
Machinery: 112 tons, 18.0 %
Hull, fittings & equipment: 317 tons, 50.7 %
Fuel, ammunition & stores: 147 tons, 23.5 %
Miscellaneous weights: 35 tons, 5.6 %

Overall survivability and seakeeping ability:[/B]
Survivability (Non-critical penetrating hits needed to sink ship):
1,721 lbs / 781 Kg = 67.9 x 3.7 " / 94 mm shells or 0.9 torpedoes
Stability (Unstable if below 1.00): 1.21
Metacentric height 1.3 ft / 0.4 m
Roll period: 11.8 seconds
Steadiness - As gun platform (Average = 50 %): 72 %
- Recoil effect (Restricted arc if above 1.00): 0.08
Seaboat quality (Average = 1.00): 1.61

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.383
Length to Beam Ratio: 6.97 : 1
'Natural speed' for length: 17.92 kts
Power going to wave formation at top speed: 60 %
Trim (Max stability = 0, Max steadiness = 100): 45
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: 17.00 ft / 5.18 m
- Forecastle (20 %): 13.00 ft / 3.96 m
- Mid (50 %): 13.00 ft / 3.96 m
- Quarterdeck (15 %): 13.00 ft / 3.96 m
- Stern: 13.00 ft / 3.96 m
- Average freeboard: 13.32 ft / 4.06 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 73.8 %
- Above water (accommodation/working, high = better): 180.5 %
Waterplane Area: 4,520 Square feet or 420 Square metres
Displacement factor (Displacement / loading): 196 %
Structure weight / hull surface area: 40 lbs/sq ft or 196 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.83
- Longitudinal: 5.26
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Breakdown of Weights:
20 tons for Depth Charges (war load)
10 tons for Hydrophones
5 tons Extra Gear

I added a hair extra miscellaneous weight, causing a slight rise in light tonnage; the changes are not significant enough to merit new class designations.

Ireland is going to build one of these in Q3/37 as a test boat for future orders. I was looking for something akin to the Fairmile-D "Dog Boat", but a higher top speed. It's intended to be heavily-enough armed that it can solidly defeat other MTBs, while still carrying it's own antiship torpedoes. This is a supplementary design to the smaller existing M1-type MTBs, which will remain the dominant MTB in Irish service. The BGM1 is basically taking the design a few steps further.

(Basically, I'm thinking of building one squadron of these for every three squadrons I build of the M1-type MTBs.)


[SIZE=1]Drawing originally by Wes/thesmilingassassin and modified by me.[/SIZE]

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

(I am willing to add tonnage if this boat is too light.)

I'm going to build the first of these starting in Q4/1937 as a trials ship. Yes... it's a blatant Black Swan knockoff, and that was in fact the role I'm looking to fill. The main traits I sought were excellent range to handle possible convoy operations, and high miscellaneous weight to handle ASW loadouts and equipment growth. Gunnery complement was mainly selected to provide AA coverage and is deemed sufficient enough to sink surfaced submarines - it's not really intended for antiship work.

The remaining seven vessels I plan to build will be authorized once Shannon has completed her trials period and is pronounced either a success or failure. Vessels will be named after Irish rivers. Come the 1940s, I might build more if the situation requires it.


[SIZE=1]Drawing originally by Wes/thesmilingassassin and modified by me.[/SIZE]

[SIZE=3]Shannon, Irish Sloop laid down 1937[/SIZE]

Displacement:
1,100 t light; 1,162 t standard; 1,343 t normal; 1,487 t full load

Dimensions: Length overall / water x beam x draught
304.36 ft / 299.00 ft x 37.50 ft x 11.00 ft (normal load)
92.77 m / 91.14 m x 11.43 m x 3.35 m

Armament:
6 - 3.70" / 94.0 mm guns (3x2 guns), 25.33lbs / 11.49kg shells, 1937 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, majority forward, 1 raised mount - superfiring
4 - 1.57" / 40.0 mm guns (1x4 guns), 1.95lbs / 0.88kg shells, 1937 Model
Anti-aircraft guns in deck mount
on centreline aft, all raised guns - superfiring
12 - 0.79" / 20.0 mm guns (6x2 guns), 0.24lbs / 0.11kg shells, 1937 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
4 - 0.50" / 12.7 mm guns (2x2 guns), 0.06lbs / 0.03kg shells, 1937 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 163 lbs / 74 kg
Shells per gun, main battery: 365

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.59" / 15 mm 0.59" / 15 mm
2nd: 0.59" / 15 mm 0.39" / 10 mm -
3rd: 0.39" / 10 mm - -
4th: 0.39" / 10 mm - -

- Conning tower: 0.98" / 25 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 6,982 shp / 5,209 Kw = 23.00 kts
Range 9,000nm at 12.00 kts
Bunker at max displacement = 325 tons

Complement:
110 - 144

Cost:
£0.451 million / $1.805 million

Distribution of weights at normal displacement:
Armament: 20 tons, 1.5 %
Armour: 17 tons, 1.2 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 14 tons, 1.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 3 tons, 0.2 %
Machinery: 194 tons, 14.4 %
Hull, fittings & equipment: 720 tons, 53.6 %
Fuel, ammunition & stores: 242 tons, 18.0 %
Miscellaneous weights: 150 tons, 11.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
3,524 lbs / 1,598 Kg = 139.1 x 3.7 " / 94 mm shells or 1.2 torpedoes
Stability (Unstable if below 1.00): 1.13
Metacentric height 1.4 ft / 0.4 m
Roll period: 13.1 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.33
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has low quarterdeck
and transom stern
Block coefficient: 0.381
Length to Beam Ratio: 7.97 : 1
'Natural speed' for length: 20.48 kts
Power going to wave formation at top speed: 54 %
Trim (Max stability = 0, Max steadiness = 100): 35
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: 20.00 ft / 6.10 m
- Forecastle (20 %): 18.00 ft / 5.49 m
- Mid (50 %): 17.00 ft / 5.18 m
- Quarterdeck (25 %): 10.00 ft / 3.05 m (17.00 ft / 5.18 m before break)
- Stern: 10.00 ft / 3.05 m
- Average freeboard: 15.76 ft / 4.80 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 73.1 %
- Above water (accommodation/working, high = better): 212.2 %
Waterplane Area: 7,096 Square feet or 659 Square metres
Displacement factor (Displacement / loading): 187 %
Structure weight / hull surface area: 56 lbs/sq ft or 273 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.86
- Longitudinal: 4.66
- Overall: 1.02
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
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:
- 10 tons for hydrophones
- 40 tons for extra depth charges, etc. (190x420lbs depth charges)
- 10 tons for K-guns
- 25 tons for Classified-1
- 5 tons for Classified-2
- 50 tons for crew comfort or growth

Quoted

Originally posted by Brockpaine
Engines: 3 B+W Marine Diesels (Danish), running 3 shafts

Nice to see you went with the BEST Marine Diesels in the World, no PROBABLY about it!!

Quoted

Originally posted by Commodore Green

Quoted

Originally posted by Brockpaine
Engines: 3 B+W Marine Diesels (Danish), running 3 shafts

Nice to see you went with the BEST Marine Diesels in the World, no PROBABLY about it!!

I'm already using them on my M1-class MTBs; no need to throw the Supply Office for a loop when you've got a good thing going.

It looks like a very nice little ship though I think 190 depth charges might be overkill.

Quoted

Originally posted by Red Admiral
It looks like a very nice little ship though I think 190 depth charges might be overkill.

Maybe. I'd rather have the space and weight for that many from the design stage, and leave some ashore if it proves too much, rather than attempting to retrofit them with extra DCs in the middle of a war.

How many do you think would be sufficient?

On the BGM-1, it seems a touch early for such a vessel, as I recall the Fairmile D's were mostly a reaction to the difficulties encountered by British MTBs in fighting German S-boats. Unless Ireland is facing some reasonable number of larger MTBs, it seems a bit of a stretch to go here.

Also, while I don't think it would be a problem, has Ireland checked with Nordmark about the 40mm Bofors? Or would it make more sense to, at least for now, use the 2 lbr?

Quoted

Originally posted by Hrolf Hakonson
On the BGM-1, it seems a touch early for such a vessel, as I recall the Fairmile D's were mostly a reaction to the difficulties encountered by British MTBs in fighting German S-boats. Unless Ireland is facing some reasonable number of larger MTBs, it seems a bit of a stretch to go here.

Not entirely sure I agree. The BGM1's armament is calculated mainly to serve as a gunboat - whether as an AA harbor launch, an anti-MTB vessel, or even as an ASW craft. While I think it would make a good anti-MTB, the three 40mm guns should provide heavy AA for the size, and let these boats shoot up submarine decks and force the subs to dive. The size is important for seakeeping, and that was what allows the boats to be well-armed.

The alternative is to build a faster, better-armed Aisling class, which is... not really any different from what I've got here. The Aislings are merely longer-legged and have a few weeks of endurance.

Quoted

Originally posted by Hrolf Hakonson
Also, while I don't think it would be a problem, has Ireland checked with Nordmark about the 40mm Bofors? Or would it make more sense to, at least for now, use the 2 lbr?

No, but the 2-pounder could be used as well, I suppose. I only looked up the weight for the Bofors because it's the best known.