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Quoted
Originally posted by BruceDuncan
My first reaction is that the vessel seems very large for the proposed armament. I would think that the gun and torpedo outfit could be carried in a smaller ship. Are there particular reasons for choosing a hull of such dimensions?
Quoted
[SIZE=3]Deirdre, Irish Destroyer laid down 1944[/SIZE]
Displacement:
2,463 t light; 2,657 t standard; 3,274 t normal; 3,768 t full load
Dimensions: Length overall / water x beam x draught
447.55 ft / 436.35 ft x 44.62 ft x 12.80 ft (normal load)
136.41 m / 133.00 m x 13.60 m x 3.90 m
Armament:
6 - 4.50" / 114 mm guns (3x2 guns), 45.00lbs / 20.41kg shells, 1944 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, majority forward, 1 raised mount - superfiring
8 - 1.57" / 40.0 mm guns (4x2 guns), 1.95lbs / 0.89kg shells, 1944 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
4 - 1.57" / 40.0 mm guns (1x4 guns), 1.95lbs / 0.89kg shells, 1944 Model
Anti-aircraft guns in deck mount
on centreline aft, all raised guns - superfiring
4 - 0.66" / 16.8 mm guns in single mounts, 0.14lbs / 0.07kg shells, 1944 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 294 lbs / 133 kg
Shells per gun, main battery: 750
5 - 21.0" / 533.4 mm above water torpedoes
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.18" / 30 mm 0.79" / 20 mm 0.79" / 20 mm
2nd: 0.79" / 20 mm 0.39" / 10 mm -
3rd: 0.79" / 20 mm 0.39" / 10 mm -
4th: 0.59" / 15 mm - -
- Conning tower: 1.18" / 30 mm
Machinery:
Oil fired boilers, steam turbines plus diesel motors,
Geared drive, 2 shafts, 51,813 shp / 38,652 Kw = 34.00 kts
Range 7,500nm at 18.00 kts
Bunker at max displacement = 1,110 tons
Complement:
216 - 281
Cost:
£2.036 million / $8.144 million
Distribution of weights at normal displacement:
Armament: 37 tons, 1.1 %
Armour: 28 tons, 0.9 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 22 tons, 0.7 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 6 tons, 0.2 %
Machinery: 1,323 tons, 40.4 %
Hull, fittings & equipment: 915 tons, 27.9 %
Fuel, ammunition & stores: 811 tons, 24.8 %
Miscellaneous weights: 160 tons, 4.9 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,447 lbs / 656 Kg = 31.8 x 4.5 " / 114 mm shells or 0.5 torpedoes
Stability (Unstable if below 1.00): 1.34
Metacentric height 2.5 ft / 0.8 m
Roll period: 11.8 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.22
Seaboat quality (Average = 1.00): 1.17
Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.460
Length to Beam Ratio: 9.78 : 1
'Natural speed' for length: 24.00 kts
Power going to wave formation at top speed: 65 %
Trim (Max stability = 0, Max steadiness = 100): 60
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 1.64 ft / 0.50 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 26.25 ft / 8.00 m
- Forecastle (25 %): 23.79 ft / 7.25 m
- Mid (50 %): 21.33 ft / 6.50 m (13.78 ft / 4.20 m aft of break)
- Quarterdeck (15 %): 13.78 ft / 4.20 m
- Stern: 13.78 ft / 4.20 m
- Average freeboard: 18.72 ft / 5.71 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 148.2 %
- Above water (accommodation/working, high = better): 164.7 %
Waterplane Area: 13,011 Square feet or 1,209 Square metres
Displacement factor (Displacement / loading): 105 %
Structure weight / hull surface area: 39 lbs/sq ft or 192 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 1.56
- Overall: 0.56
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Quoted
[SIZE=3]Morrigan, Irish Minesweeper laid down 1942[/SIZE]
Displacement:
798 t light; 833 t standard; 1,040 t normal; 1,205 t full load
Dimensions: Length overall / water x beam x draught
232.78 ft / 229.66 ft x 31.82 ft x 10.83 ft (normal load)
70.95 m / 70.00 m x 9.70 m x 3.30 m
Armament:
1 - 3.70" / 94.0 mm guns in single mounts, 25.33lbs / 11.49kg shells, 1942 Model
Dual purpose gun in a deck mount with hoist
on centreline forward
2 - 1.57" / 40.0 mm guns (1x2 guns), 1.95lbs / 0.88kg shells, 1942 Model
Anti-aircraft guns in deck mount
on centreline aft
8 - 0.79" / 20.0 mm guns (4x2 guns), 0.24lbs / 0.11kg shells, 1942 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 31 lbs / 14 kg
Shells per gun, main battery: 750
Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 3,093 shp / 2,307 Kw = 18.00 kts
Range 6,500nm at 15.00 kts
Bunker at max displacement = 372 tons
Complement:
91 - 119
Cost:
£0.270 million / $1.082 million
Distribution of weights at normal displacement:
Armament: 4 tons, 0.4 %
Machinery: 81 tons, 7.8 %
Hull, fittings & equipment: 533 tons, 51.2 %
Fuel, ammunition & stores: 242 tons, 23.3 %
Miscellaneous weights: 180 tons, 17.3 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
2,795 lbs / 1,268 Kg = 110.3 x 3.7 " / 94 mm shells or 1.5 torpedoes
Stability (Unstable if below 1.00): 1.12
Metacentric height 1.1 ft / 0.3 m
Roll period: 12.7 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.07
Seaboat quality (Average = 1.00): 2.00
Hull form characteristics:
Hull has raised forecastle, rise forward of midbreak
Block coefficient: 0.460
Length to Beam Ratio: 7.22 : 1
'Natural speed' for length: 15.15 kts
Power going to wave formation at top speed: 52 %
Trim (Max stability = 0, Max steadiness = 100): 35
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: 17.72 ft / 5.40 m
- Forecastle (20 %): 18.04 ft / 5.50 m (17.06 ft / 5.20 m aft of break)
- Mid (45 %): 16.40 ft / 5.00 m (8.53 ft / 2.60 m aft of break)
- Quarterdeck (15 %): 8.53 ft / 2.60 m
- Stern: 8.53 ft / 2.60 m
- Average freeboard: 12.46 ft / 3.80 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 49.4 %
- Above water (accommodation/working, high = better): 115.0 %
Waterplane Area: 4,701 Square feet or 437 Square metres
Displacement factor (Displacement / loading): 279 %
Structure weight / hull surface area: 63 lbs/sq ft or 307 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.32
- Longitudinal: 5.34
- Overall: 1.51
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
Quoted
Originally posted by Desertfox
An idea with all the extra cash lying around is to build extra frigates but then place them immediately in reserve. Therefore, creating a force that is cheap to maintain in peacetime but can be immediately put to use in wartime.-
Quoted
[SIZE=3]Flidais, Irish Underway Replenishment Ship laid down 1942[/SIZE]
Displacement:
4,477 t light; 4,800 t standard; 11,535 t normal; 16,922 t full load
Dimensions: Length overall / water x beam x draught
475.72 ft / 475.72 ft x 59.06 ft x 23.95 ft (normal load)
145.00 m / 145.00 m x 18.00 m x 7.30 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
24 - 1.57" / 40.0 mm guns (2x12 guns), 1.95lbs / 0.89kg shells, 1942 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
12 - 0.79" / 20.0 mm guns (6x2 guns), 0.24lbs / 0.11kg shells, 1942 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 151 lbs / 69 kg
Shells per gun, main battery: 900
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Ends: Unarmoured
- Torpedo Bulkhead:
0.79" / 20 mm 360.89 ft / 110.00 m 23.95 ft / 7.30 m
- 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 -
- Conning tower: 0.98" / 25 mm
Machinery:
Oil fired boilers, steam turbines plus diesel motors,
Electric motors, 2 shafts, 11,306 shp / 8,435 Kw = 18.00 kts
Range 35,000nm at 18.00 kts
Bunker at max displacement = 12,122 tons
Complement:
556 - 723
Cost:
£1.361 million / $5.445 million
Distribution of weights at normal displacement:
Armament: 19 tons, 0.2 %
Armour: 274 tons, 2.4 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 252 tons, 2.2 %
- Armament: 11 tons, 0.1 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 11 tons, 0.1 %
Machinery: 295 tons, 2.6 %
Hull, fittings & equipment: 2,644 tons, 22.9 %
Fuel, ammunition & stores: 7,057 tons, 61.2 %
Miscellaneous weights: 1,245 tons, 10.8 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
55,373 lbs / 25,117 Kg = 2,186.4 x 3.7 " / 94 mm shells or 14.4 torpedoes
Stability (Unstable if below 1.00): 1.56
Metacentric height 4.8 ft / 1.5 m
Roll period: 11.3 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.02
Seaboat quality (Average = 1.00): 2.00
Hull form characteristics:
Hull has raised forecastle, raised quarterdeck
Block coefficient: 0.600
Length to Beam Ratio: 8.06 : 1
'Natural speed' for length: 21.81 kts
Power going to wave formation at top speed: 38 %
Trim (Max stability = 0, Max steadiness = 100): 35
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: 26.25 ft / 8.00 m
- Forecastle (15 %): 23.79 ft / 7.25 m (16.40 ft / 5.00 m aft of break)
- Mid (50 %): 16.40 ft / 5.00 m
- Quarterdeck (20 %): 23.79 ft / 7.25 m (16.40 ft / 5.00 m before break)
- Stern: 26.25 ft / 8.00 m
- Average freeboard: 19.38 ft / 5.91 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 35.9 %
- Above water (accommodation/working, high = better): 115.5 %
Waterplane Area: 20,547 Square feet or 1,909 Square metres
Displacement factor (Displacement / loading): 510 %
Structure weight / hull surface area: 79 lbs/sq ft or 384 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.94
- Longitudinal: 1.61
- Overall: 1.00
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
Notes:
The TDS is simmed to simulate the ship having a double bottom hull to survive wave action or damage, etc.
Quoted
Originally posted by Hood
It depends if the INS is going to field one large ASW force or a couple of smaller task forces. I would say one tanker would suffice to support a large group, two small ships would cost more to operate and would be a luxury in peacetime.
The 40mm problem could be solved by using qaud mounts.
Quoted
[SIZE=3]Deichtine, Irish Tiny Tanker laid down 1942[/SIZE]
Displacement:
3,730 t light; 3,976 t standard; 8,373 t normal; 11,890 t full load
Dimensions: Length overall / water x beam x draught
424.58 ft / 410.11 ft x 55.77 ft x 23.29 ft (normal load)
129.41 m / 125.00 m x 17.00 m x 7.10 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
16 - 1.57" / 40.0 mm guns (4x4 guns), 1.95lbs / 0.89kg shells, 1942 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
8 - 0.79" / 20.0 mm guns (4x2 guns), 0.24lbs / 0.11kg shells, 1942 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 135 lbs / 61 kg
Shells per gun, main battery: 900
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Ends: Unarmoured
- Torpedo Bulkhead:
0.79" / 20 mm 393.70 ft / 120.00 m 29.53 ft / 9.00 m
Machinery:
Oil fired boilers, steam turbines plus diesel motors,
Electric motors, 1 shaft, 6,931 shp / 5,171 Kw = 16.50 kts
Range 37,000nm at 16.00 kts
Bunker at max displacement = 7,915 tons
Complement:
436 - 568
Cost:
£1.082 million / $4.328 million
Distribution of weights at normal displacement:
Armament: 17 tons, 0.2 %
Armour: 339 tons, 4.0 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 339 tons, 4.0 %
- Armament: 0 tons, 0.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 181 tons, 2.2 %
Hull, fittings & equipment: 1,943 tons, 23.2 %
Fuel, ammunition & stores: 4,643 tons, 55.5 %
Miscellaneous weights: 1,250 tons, 14.9 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
32,968 lbs / 14,954 Kg = 1,301.7 x 3.7 " / 94 mm shells or 9.7 torpedoes
Stability (Unstable if below 1.00): 1.41
Metacentric height 3.8 ft / 1.2 m
Roll period: 12.0 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: 0.550
Length to Beam Ratio: 7.35 : 1
'Natural speed' for length: 20.25 kts
Power going to wave formation at top speed: 37 %
Trim (Max stability = 0, Max steadiness = 100): 35
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 9.84 ft / 3.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 26.25 ft / 8.00 m
- Forecastle (20 %): 22.97 ft / 7.00 m (15.42 ft / 4.70 m aft of break)
- Mid (50 %): 15.42 ft / 4.70 m
- Quarterdeck (15 %): 22.97 ft / 7.00 m (15.42 ft / 4.70 m before break)
- Stern: 24.61 ft / 7.50 m
- Average freeboard: 18.45 ft / 5.62 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 42.5 %
- Above water (accommodation/working, high = better): 104.3 %
Waterplane Area: 15,482 Square feet or 1,438 Square metres
Displacement factor (Displacement / loading): 402 %
Structure weight / hull surface area: 73 lbs/sq ft or 358 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.92
- Longitudinal: 2.04
- Overall: 1.00
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
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