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1

Saturday, February 2nd 2019, 5:36pm

Royal Navy Ships for 1950

The Admiralty after a few years of building specialised destroyers are thinking of reverting to a general purpose type based on the Battle class built a few years ago but modernised and slightly lengthened.
It has improved armament with modernised 6pdr AA guns, fixed torpedo tubes in a deckhouse and Limbo mortar.
The machinery is almost identical but with electric rather than geared drive.
EDITED: updated file

Battle Batch II Class Destroyers, Great Britain Destroyer laid down 1950

Displacement:
2,191 t light; 2,332 t standard; 2,648 t normal; 2,901 t full load

Dimensions: Length overall / water x beam x draught
402.59 ft / 390.00 ft x 41.00 ft x 13.90 ft (normal load)
122.71 m / 118.87 m x 12.50 m x 4.24 m

Armament:
6 - 4.50" / 114 mm guns (3x2 guns), 45.00lbs / 20.41kg shells, 1945 Model
Automatic rapid fire guns in deck mounts with hoists
on centreline ends, majority forward, 2 raised mounts - superfiring
4 - 2.24" / 57.0 mm guns (1x4 guns), 6.00lbs / 2.72kg shells, 1947 Model
Anti-aircraft guns in deck mount
on centreline aft, all raised guns - superfiring
4 - 2.24" / 57.0 mm guns (2x2 guns), 6.00lbs / 2.72kg shells, 1947 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
4 - 1.57" / 40.0 mm guns (2x2 guns), 2.00lbs / 0.91kg shells, 1945 Model
Anti-aircraft guns in deck mounts
on side, all forward
Weight of broadside 326 lbs / 148 kg
Shells per gun, main battery: 450
8 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.00" / 25 mm 1.00" / 25 mm 1.00" / 25 mm
2nd: 1.00" / 25 mm 1.00" / 25 mm -
3rd: 0.50" / 13 mm 0.50" / 13 mm -
4th: 0.50" / 13 mm 0.50" / 13 mm -

- Conning tower: 0.50" / 13 mm

Machinery:
Oil fired boilers, steam turbines,
Electric motors, 2 shafts, 45,000 shp / 33,570 Kw = 33.76 kts
Range 6,000nm at 16.00 kts
Bunker at max displacement = 568 tons

Complement:
183 - 239

Cost:
£2.058 million / $8.231 million

Distribution of weights at normal displacement:
Armament: 48 tons, 1.8 %
Armour: 29 tons, 1.1 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 27 tons, 1.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 2 tons, 0.1 %
Machinery: 1,046 tons, 39.5 %
Hull, fittings & equipment: 818 tons, 30.9 %
Fuel, ammunition & stores: 457 tons, 17.2 %
Miscellaneous weights: 250 tons, 9.4 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,072 lbs / 486 Kg = 23.5 x 4.5 " / 114 mm shells or 0.5 torpedoes
Stability (Unstable if below 1.00): 1.25
Metacentric height 2.0 ft / 0.6 m
Roll period: 12.3 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.32
Seaboat quality (Average = 1.00): 1.16

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.417
Length to Beam Ratio: 9.51 : 1
'Natural speed' for length: 22.88 kts
Power going to wave formation at top speed: 66 %
Trim (Max stability = 0, Max steadiness = 100): 44
Bow angle (Positive = bow angles forward): 25.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 27.00 ft / 8.23 m
- Forecastle (20 %): 20.00 ft / 6.10 m
- Mid (45 %): 16.50 ft / 5.03 m
- Quarterdeck (15 %): 16.50 ft / 5.03 m
- Stern: 16.50 ft / 5.03 m
- Average freeboard: 18.20 ft / 5.55 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 154.1 %
- Above water (accommodation/working, high = better): 121.0 %
Waterplane Area: 10,327 Square feet or 959 Square metres
Displacement factor (Displacement / loading): 94 %
Structure weight / hull surface area: 41 lbs/sq ft or 198 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.51
- Longitudinal: 2.28
- Overall: 0.59
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent

Class Names:

Torpedo tubes are fixed at an angle of 55 degrees outboard with one reload for each tube, a mix of anti-ship and Mk.20 'Bidder' acoustic-homing anti-submarine torpedoes
One Limbo A/S motar fitted aft

Misc weight includes:
ASDIC Type 940
Passive ASDIC Type 147
Passive Torpedo Warning ASDIC Type 941
One Height-Finder Type 972 set
One Target-Indication Type 975 set
One Surface Search Type 970 set
One MRS7 fire-control system using Mk.6M Gunnery Director with twin Type 288 RDF sets, Simple Electric Deflection Calculator and Flyplane table
Two MRS8 fire-control systems using CRBF director with Type 262 RDF set
HF/DF Type 292
VHF Direction Finder Type 295Q
Passive Intercept Type UA1
Two RU-series jammers
1 Limbo A/S Mortar with 30x projectiles
50 tons growth

2

Sunday, February 3rd 2019, 11:04am

1950 will be cruiser time too for the Royal Navy.
The Acheron class will be what was termed an 'AACL' in the 1940s, but the Acheron carries a full range of anti-aircraft, anti-ship and anti-submarine weapons to revisit the 1920s RN concept of the Escort Cruiser. Designed to form part of a carrier force escort, they carry all the neccessary weapons and sensors for their role, they can unleash a deadly barrage.

The 5.5in guns are those of the Town class cruiser-destroyers but in a new twin mounting. The 3in is a new L/70 AA mount and is backed up by new quad 57mm mounts which is the sextuple 40mm mount but reworked for four 57mm guns. Plenty of fire-control as well. Four will be laid down in 1950 but more will be built during the early 1950s.


Acheron Class, Great Britain Escort Cruiser laid down 1950

Displacement:
8,921 t light; 9,411 t standard; 10,868 t normal; 12,034 t full load

Dimensions: Length overall / water x beam x draught
656.80 ft / 650.00 ft x 56.00 ft x 19.00 ft (normal load)
200.19 m / 198.12 m x 17.07 m x 5.79 m

Armament:
10 - 5.50" / 140 mm guns (5x2 guns), 80.00lbs / 36.29kg shells, 1950 Model
Automatic rapid fire guns in turrets (on barbettes)
on centreline ends, majority forward, 3 raised mounts - superfiring
8 - 3.00" / 76.2 mm guns (4x2 guns), 12.50lbs / 5.67kg shells, 1950 Model
Automatic rapid fire guns in deck mounts with hoists
on side ends, evenly spread
16 - 2.24" / 57.0 mm guns (4x4 guns), 5.65lbs / 2.56kg shells, 1945 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
8 - 1.57" / 40.0 mm guns (4x2 guns), 1.95lbs / 0.88kg shells, 1945 Model
Anti-aircraft guns in deck mounts
on side ends, evenly spread, all raised mounts - superfiring
Weight of broadside 1,006 lbs / 456 kg
Shells per gun, main battery: 450
8 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 4.50" / 114 mm 350.00 ft / 106.68 m 13.00 ft / 3.96 m
Ends: Unarmoured
Main Belt covers 83 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.50" / 38 mm 1.00" / 25 mm 3.00" / 76 mm
2nd: 1.00" / 25 mm 1.00" / 25 mm 3.00" / 76 mm
3rd: 1.00" / 25 mm 1.00" / 25 mm -
4th: 0.50" / 13 mm 0.50" / 13 mm -

- Armour deck: 3.00" / 76 mm, Conning tower: 2.00" / 51 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 75,000 shp / 55,950 Kw = 31.84 kts
Range 7,000nm at 20.00 kts
Bunker at max displacement = 2,623 tons

Complement:
531 - 691

Cost:
£5.418 million / $21.672 million

Distribution of weights at normal displacement:
Armament: 154 tons, 1.4 %
Armour: 2,602 tons, 23.9 %
- Belts: 865 tons, 8.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 248 tons, 2.3 %
- Armour Deck: 1,468 tons, 13.5 %
- Conning Tower: 21 tons, 0.2 %
Machinery: 1,794 tons, 16.5 %
Hull, fittings & equipment: 3,955 tons, 36.4 %
Fuel, ammunition & stores: 1,947 tons, 17.9 %
Miscellaneous weights: 415 tons, 3.8 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
19,045 lbs / 8,639 Kg = 228.9 x 5.5 " / 140 mm shells or 2.3 torpedoes
Stability (Unstable if below 1.00): 1.14
Metacentric height 2.7 ft / 0.8 m
Roll period: 14.4 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.36
Seaboat quality (Average = 1.00): 1.39

Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.550
Length to Beam Ratio: 11.61 : 1
'Natural speed' for length: 28.63 kts
Power going to wave formation at top speed: 53 %
Trim (Max stability = 0, Max steadiness = 100): 51
Bow angle (Positive = bow angles forward): 12.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 32.00 ft / 9.75 m
- Forecastle (20 %): 26.00 ft / 7.92 m
- Mid (43 %): 23.50 ft / 7.16 m (16.00 ft / 4.88 m aft of break)
- Quarterdeck (20 %): 16.00 ft / 4.88 m
- Stern: 18.00 ft / 5.49 m
- Average freeboard: 20.69 ft / 6.31 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 71.2 %
- Above water (accommodation/working, high = better): 155.8 %
Waterplane Area: 26,447 Square feet or 2,457 Square metres
Displacement factor (Displacement / loading): 139 %
Structure weight / hull surface area: 91 lbs/sq ft or 445 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.98
- Longitudinal: 1.21
- 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
Good seaboat, rides out heavy weather easily

Class Names: HMS Acheron, Acasta, Achates, Ardent, Arrow

5.5in automatic mounts simmed with 10 tons per mount
3in automatic mounts simmed with 7 tons per mount

21in torpedo tubes fixed, angled outboard for anti-ship and Mk.20 'Bidder' acoustic-homing anti-submarine torpedoes, 1x reload per tube
2x Squid A/S mortars (30x rounds each)

Electronic Equipment:
One Type 971 aerial search set
One Type 976 height-finding set
One Type 975 target indication set
One Type 276 high-definition surface set
Two MRS7 fire-control systems using Mk.6M directors with twin Type 288 RDF and Simple Electric Deflection Calculator and Flyplane table
Eight MRS8 fire-control systems using CRBF directors with Type 262 RDF
HF/DF Type 292
Passive Intercept Type UA-1
Four RU-series RDF jammers
Radio-Location Jammer Type 298 'Spooky'
VHF Direction Finder Type 295Q
Asdic Type 146M
Asdic Type 147 passive
Asdic Type 941 Passive Torpedo Warning

3

Wednesday, February 6th 2019, 8:13pm

The frigate programme continues, this design is more of less the OTL Type 12 but with heavier AA armament and heavier torpedo tubes.

Loch Class, Great Britain Frigate laid down 1950

Displacement:
1,464 t light; 1,544 t standard; 1,721 t normal; 1,862 t full load

Dimensions: Length overall / water x beam x draught
370.00 ft / 360.00 ft x 41.00 ft x 10.20 ft (normal load)
112.78 m / 109.73 m x 12.50 m x 3.11 m

Armament:
4 - 4.50" / 114 mm guns (2x2 guns), 45.00lbs / 20.41kg shells, 1945 Model
Automatic rapid fire guns in deck mounts with hoists
on centreline ends, evenly spread
8 - 1.57" / 40.0 mm guns (4x2 guns), 2.00lbs / 0.91kg shells, 1945 Model
Anti-aircraft guns in deck mounts
on side ends, evenly spread, all raised mounts - superfiring
Weight of broadside 196 lbs / 89 kg
Shells per gun, main battery: 400
8 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.50" / 38 mm 1.00" / 25 mm 1.00" / 25 mm
2nd: 0.50" / 13 mm 0.50" / 13 mm -

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 15,000 shp / 11,190 Kw = 27.27 kts
Range 5,000nm at 15.00 kts
Bunker at max displacement = 318 tons

Complement:
133 - 173

Cost:
£0.986 million / $3.943 million

Distribution of weights at normal displacement:
Armament: 29 tons, 1.7 %
Armour: 18 tons, 1.0 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 18 tons, 1.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 359 tons, 20.9 %
Hull, fittings & equipment: 618 tons, 35.9 %
Fuel, ammunition & stores: 257 tons, 14.9 %
Miscellaneous weights: 440 tons, 25.6 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,702 lbs / 772 Kg = 37.4 x 4.5 " / 114 mm shells or 0.7 torpedoes
Stability (Unstable if below 1.00): 1.20
Metacentric height 1.9 ft / 0.6 m
Roll period: 12.7 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.20
Seaboat quality (Average = 1.00): 1.90

Hull form characteristics:
Hull has raised forecastle
and transom stern
Block coefficient: 0.400
Length to Beam Ratio: 8.78 : 1
'Natural speed' for length: 22.20 kts
Power going to wave formation at top speed: 57 %
Trim (Max stability = 0, Max steadiness = 100): 27
Bow angle (Positive = bow angles forward): 18.80 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 23.50 ft / 7.16 m
- Forecastle (22 %): 23.50 ft / 7.16 m (17.00 ft / 5.18 m aft of break)
- Mid (50 %): 17.00 ft / 5.18 m
- Quarterdeck (12 %): 17.00 ft / 5.18 m
- Stern: 17.00 ft / 5.18 m
- Average freeboard: 18.43 ft / 5.62 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 110.3 %
- Above water (accommodation/working, high = better): 143.8 %
Waterplane Area: 9,429 Square feet or 876 Square metres
Displacement factor (Displacement / loading): 122 %
Structure weight / hull surface area: 35 lbs/sq ft or 171 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.51
- Longitudinal: 2.74
- Overall: 0.60
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

Class Names:

The 21in torpedo tubes are fixed and angled outboard, carry a mix of anti-ship and Mk.20 'Bidder' acoustic-homing anti-submarine torpedoes, one reload for each tube

Misc Weight includes:
ASDIC Type 940a
Passive ASDIC Type 147
Passive Torpedo Warning ASDIC Type 941
Surface Search Type 970
Target Indication Type 975
One MRS7 fire-control system using Mk.6M Gunnery Director with twin Type 288 RDF sets, Simple Electric Deflection Calculator and Flyplane table
One MRS8 fire-control system using CRBF director with Type 262 RDF set
HF/DF Type 292
Passive Intercept Type UA1
Two RU-series jammers
2x Limbo A/S Mortar with 30x projectiles per mortar
100 tons growth