WesWorld

New ships this year are;




(Only kidding..)


G Class Destroyer, Great Britain Destroyer laid down 1936

Displacement:
1,665 t light; 1,743 t standard; 1,946 t normal; 2,108 t full load

Dimensions: Length overall / water x beam x draught
369.10 ft / 360.00 ft x 33.00 ft x 13.00 ft (normal load)
112.50 m / 109.73 m x 10.06 m x 3.96 m

Armament:
6 - 4.50" / 114 mm guns (3x2 guns), 45.00lbs / 20.41kg shells, 1935 Model
Quick firing guns in deck mounts with hoists
on centreline ends, majority forward, 2 raised mounts - superfiring
4 - 1.57" / 40.0 mm guns (1x4 guns), 2.00lbs / 0.91kg shells, 1922 Model
Anti-aircraft guns in deck mount
on centreline amidships, all raised guns - superfiring
12 - 0.66" / 16.8 mm guns (2x6 guns), 0.14lbs / 0.06kg shells, 1935 Model
Machine guns in deck mounts
on side, all forward, all raised mounts - superfiring
Weight of broadside 280 lbs / 127 kg
Shells per gun, main battery: 250
8 - 24.5" / 622.3 mm above water torpedoes

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

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 40,500 shp / 30,213 Kw = 34.06 kts
Range 4,000nm at 16.00 kts
Bunker at max displacement = 364 tons

Complement:
146 - 190

Cost:
£1.159 million / $4.635 million

Distribution of weights at normal displacement:
Armament: 35 tons, 1.8 %
Armour: 13 tons, 0.7 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 13 tons, 0.7 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 941 tons, 48.4 %
Hull, fittings & equipment: 595 tons, 30.6 %
Fuel, ammunition & stores: 281 tons, 14.5 %
Miscellaneous weights: 80 tons, 4.1 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
535 lbs / 243 Kg = 11.8 x 4.5 " / 114 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.18
Metacentric height 1.3 ft / 0.4 m
Roll period: 12.2 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.57
Seaboat quality (Average = 1.00): 1.02

Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.441
Length to Beam Ratio: 10.91 : 1
'Natural speed' for length: 21.66 kts
Power going to wave formation at top speed: 68 %
Trim (Max stability = 0, Max steadiness = 100): 50
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: 25.00 ft / 7.62 m
- Forecastle (20 %): 21.50 ft / 6.55 m
- Mid (42 %): 21.50 ft / 6.55 m (11.00 ft / 3.35 m aft of break)
- Quarterdeck (15 %): 11.00 ft / 3.35 m
- Stern: 11.00 ft / 3.35 m
- Average freeboard: 15.69 ft / 4.78 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 175.4 %
- Above water (accommodation/working, high = better): 54.7 %
Waterplane Area: 7,813 Square feet or 726 Square metres
Displacement factor (Displacement / loading): 73 %
Structure weight / hull surface area: 36 lbs/sq ft or 175 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 2.24
- Overall: 0.58
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped

Class Names
Class Names: HMS Garland, Greyhound, Griffin, Grenade, Grafton, Gipsy, Guernsey, and Guinivere

Misc weight includes:

ASDIC
Full load DCs (two racks and four throwers)
4 reload torpedoes and handling gear



In late 1935 the Commander in Chief China and Far East, Admiral Charles Morton Forbes, called for a new type of mini-destroyer to supplement the fleet destroyers and be built in large numbers at a low cost. The DNC asked his destroyer teams to come up with a small 600 ton design suitable for general escort and attacking roles. Admiral of the Fleet Roger Backhouse, Commander in Chief Home Fleet, also had similar ideas and he gave his full weight to the development of the 600 tons design. The first design had two single 4in guns for AA defence, multiple machine guns and a top speed of 32kts to match the latest cruisers and carriers it would escort. Range was kept at 2000nm at 12kts due to weight issues and the realisation they would not operate too far from a British base. Admiral Backhouse demanded two twin 4in mounts for AA defence of the fleet and speed had to be dropped to 30kts, he then decided that the planned 'Standard Type Destroyer' armed with single 4.7in or 4.5in guns would suffice and be better ships all round. Thus the new design became the 600 Ton Colonial Torpedo Boat focused on torpedo attack with a secondary escort function with a basic HACS. In effect these were modern S Class types, lightweight attacking ships rather than the heavy multi-purpose destroyers built since the Great War. Vice Admiral Andrew Cunningham, Commander in Chief Western Approaches, with extensive destroyer experience in the Mediterranean argued a single gun forward would suffice, the torpedo boat would have more need of a twin mount astern to cover the retreat and it was raised atop the deckhouse for better arcs and dryness. Seaworthiness was an important aspect in the design from the start. The weight saved by having a single 4in forward was used to provide a lightweight Asdic Type 141 intended for sloops and one depth-charge rack and two throwers. Torpedo armament remained three 21in tubes, 24.5in torpedoes being too heavy. The final designs featured a 0.661in multiple HMG mount amidships but this was altered to a quadruple 2pdr mount for the anti-MTB role and as an AA weapon. Two twin HMG mounts are also fitted.

600 Ton Colonial Torpedo Boat, Great Britain Torpedo Boat laid down 1936

Displacement:
596 t light; 618 t standard; 664 t normal; 702 t full load

Dimensions: Length overall / water x beam x draught
270.36 ft / 265.00 ft x 29.00 ft x 7.70 ft (normal load)
82.41 m / 80.77 m x 8.84 m x 2.35 m

Armament:
3 - 4.00" / 102 mm guns (2 mounts), 31.00lbs / 14.06kg shells, 1931 Model
Quick firing guns in deck mounts
on centreline ends, evenly spread, 2 raised mounts
4 - 1.57" / 40.0 mm guns (1x4 guns), 2.00lbs / 0.91kg shells, 1922 Model
Anti-aircraft guns in deck mount
on centreline amidships, all raised guns - superfiring
4 - 0.66" / 16.8 mm guns (2x2 guns), 0.14lbs / 0.06kg shells, 1935 Model
Machine guns in deck mounts
on side, all forward, all raised mounts - superfiring
Weight of broadside 102 lbs / 46 kg
Shells per gun, main battery: 150
3 - 21.0" / 533.4 mm above water torpedoes

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 - -

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 14,000 shp / 10,444 Kw = 30.13 kts
Range 2,000nm at 15.00 kts
Bunker at max displacement = 84 tons

Complement:
65 - 85

Cost:
£0.388 million / $1.554 million

Distribution of weights at normal displacement:
Armament: 13 tons, 2.0 %
Armour: 5 tons, 0.7 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 5 tons, 0.7 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 299 tons, 45.0 %
Hull, fittings & equipment: 263 tons, 39.6 %
Fuel, ammunition & stores: 69 tons, 10.4 %
Miscellaneous weights: 15 tons, 2.3 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
329 lbs / 149 Kg = 10.3 x 4.0 " / 102 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.32
Metacentric height 1.3 ft / 0.4 m
Roll period: 10.8 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.18
Seaboat quality (Average = 1.00): 1.14

Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.393
Length to Beam Ratio: 9.14 : 1
'Natural speed' for length: 19.00 kts
Power going to wave formation at top speed: 68 %
Trim (Max stability = 0, Max steadiness = 100): 44
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 (40 %): 18.00 ft / 5.49 m (11.00 ft / 3.35 m aft of break)
- Quarterdeck (15 %): 11.00 ft / 3.35 m
- Stern: 11.00 ft / 3.35 m
- Average freeboard: 13.96 ft / 4.26 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 163.0 %
- Above water (accommodation/working, high = better): 137.8 %
Waterplane Area: 4,890 Square feet or 454 Square metres
Displacement factor (Displacement / loading): 73 %
Structure weight / hull surface area: 27 lbs/sq ft or 131 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 3.66
- Overall: 0.61
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent

Aircraft Carriers
Commander in Chief Fleet Air Aim Admiral R. G. H. Henderson at the end of 1935 decided which types he wanted to be built from 1936. The next five planned carriers were Carriers F, G, H, I and J.

The Swiftsure Class repeat with the new 4.5in and 57mm weapons had morphed, with the Sea Lords insistence on greater capacity, to a much larger ship. Some 800 feet long and 104 feet wide it was to carry around 96 aircraft and weighed some 10,000 tons more than HMS Swiftsure. The DNC was not satisfied with the cost and the resulting design was far larger than Admiral Henderson wanted. He had wanted armoured carriers and the DNC had overruled this, although the larger Swiftsure had 3in deck, 4.5in belt and 1.75in torpedo bulkhead armour. The design shrunk to 750 feet in length but still carried some 5000 tons of supplies, parts and fuel for its aircraft and was intended to be largely self-sufficient. The DNC then made further pruning of weights, but not armour, reduced the beam and got the design down to around 29,000 tons normal displacement. In this form the final design was approved by the DNC and Admiral Henderson as Carrier F (HMS Eagle) as the sixth fleet carrier to allow every major fleet to have two main carriers.

Carriers G, H, I and J could not be sister ships, the cost was too high. Admiral R. G. H. Henderson had been instrumental in the design of a class of new Trade Protection Carriers. These light carriers will be built to serve as carriers for the smaller Stations. In the event of a major war another eight of this class would be built as an Emergency War Standard Carrier. During 1936 the DNC and his main carrier designers worked on this proposal. The proposed 4in guns gave way to standard 4.5in twins, the new 57mm AA weapon was fitted but two octuple 2pr mounts were retained for anti-aircraft defence but also as anti-MTB guns. Belt armour was restricted to the magazines but calls for torpedo defence by the Sea Lords were abandoned as this added 2,000 tons to the ship and robbed internal space. The 3in armoured thick deck was reduced to 2in on the hangar deck to cover the vitals only. Splinter protection to the bridge was also sacrificed to save weight. 48 aircraft are to be carried in a single-storey hangar served by two lifts; the design can accommodate aircraft up to 15,000lbs in weight giving excellent growth characteristics.

Very nice pictures (even of the future designs).


G-class looks solid, perhaps a little light on the 2-lbrs and a touch slower than I'd prefer, but on the smallish displacement a very solid design. The smallish displacement DOES allow for more to be built for the same cost.

The Coastal Torpedo Boat manages a better speed with better behavior than I've commonly seen in that size range, but only 3 torpedoes will make it's job difficult. The 30 knot speed is also a limitation, but it IS small.


HMS Eagle sounds not too different from the two German carriers being built in Nordmark, should be a powerful vessel.

The trade protection carriers sound like they're well-equipped with planes but pretty vulnerable to battle damage. However, that comes with the territory, so shouldn't be a surprise. Looking forward to seeing SS's of the carrier designs.

I think the G class quite nice, the only aspect that concerns me is the shortish range, otherwise quite decent.

Carriers G, H, I and J sound like they will be 10-12,000 tons.
Only a bit smaller than the Dutch 'Fleet' carriers. Eagle sounds good.

The Admiralty is now able to give specifications for Carriers F, G-J;


HMS Eagle Carrier F, Great Britain Aircraft Carrier laid down 1937

Displacement:
25,210 t light; 26,068 t standard; 29,222 t normal; 31,745 t full load

Dimensions: Length overall / water x beam x draught
757.65 ft / 750.00 ft x 94.75 ft x 28.50 ft (normal load)
230.93 m / 228.60 m x 28.88 m x 8.69 m

Armament:
16 - 4.50" / 114 mm guns (8x2 guns), 45.00lbs / 20.41kg shells, 1935 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, evenly spread, all raised mounts - superfiring
16 - 2.24" / 57.0 mm guns (8x2 guns), 6.00lbs / 2.72kg shells, 1935 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
32 - 1.57" / 40.0 mm guns (4x8 guns), 2.00lbs / 0.91kg shells, 1922 Model
Anti-aircraft guns in deck mounts
on side ends, evenly spread, all raised mounts - superfiring
60 - 0.66" / 16.8 mm guns (10x6 guns), 0.14lbs / 0.06kg shells, 1935 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 888 lbs / 403 kg
Shells per gun, main battery: 500

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 4.50" / 114 mm 485.00 ft / 147.83 m 16.00 ft / 4.88 m
Ends: Unarmoured
Main Belt covers 99 % of normal length

- Torpedo Bulkhead:
1.75" / 44 mm 485.00 ft / 147.83 m 26.50 ft / 8.08 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.00" / 25 mm 0.50" / 13 mm 2.00" / 51 mm
2nd: 0.50" / 13 mm - -
3rd: 0.50" / 13 mm - -
4th: 0.50" / 13 mm - -

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

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 154,500 shp / 115,257 Kw = 32.02 kts
Range 12,000nm at 16.00 kts
Bunker at max displacement = 5,676 tons

Complement:
1,116 - 1,452

Cost:
£8.593 million / $34.372 million

Distribution of weights at normal displacement:
Armament: 111 tons, 0.4 %
Armour: 5,045 tons, 17.3 %
- Belts: 1,487 tons, 5.1 %
- Torpedo bulkhead: 832 tons, 2.8 %
- Armament: 46 tons, 0.2 %
- Armour Deck: 2,640 tons, 9.0 %
- Conning Tower: 41 tons, 0.1 %
Machinery: 4,282 tons, 14.7 %
Hull, fittings & equipment: 8,772 tons, 30.0 %
Fuel, ammunition & stores: 4,012 tons, 13.7 %
Miscellaneous weights: 7,000 tons, 24.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
41,961 lbs / 19,033 Kg = 921.0 x 4.5 " / 114 mm shells or 6.1 torpedoes
Stability (Unstable if below 1.00): 1.12
Metacentric height 5.7 ft / 1.7 m
Roll period: 16.6 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.06
Seaboat quality (Average = 1.00): 1.36

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.505
Length to Beam Ratio: 7.92 : 1
'Natural speed' for length: 27.39 kts
Power going to wave formation at top speed: 54 %
Trim (Max stability = 0, Max steadiness = 100): 52
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: 36.00 ft / 10.97 m
- Forecastle (20 %): 24.00 ft / 7.32 m
- Mid (50 %): 24.00 ft / 7.32 m
- Quarterdeck (15 %): 24.00 ft / 7.32 m
- Stern: 24.00 ft / 7.32 m
- Average freeboard: 24.96 ft / 7.61 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 98.8 %
- Above water (accommodation/working, high = better): 194.8 %
Waterplane Area: 47,564 Square feet or 4,419 Square metres
Displacement factor (Displacement / loading): 136 %
Structure weight / hull surface area: 125 lbs/sq ft or 610 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.97
- Longitudinal: 1.28
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

Upper hangar deck: 668 x 60 x 17.5ft
Lower hangar deck : 668 x 60 x 17.5ft
Served by two 40 x 33ft lifts with capacity for 20,000lbs
Two hydralic accelerators with capacity for 18,000lbs aircraft
Arrestor gear of 8 wires, 1 trickle wire, 2 forward wires and two safety barriers

96 aircraft usually carried (8 x 12 aircraft squadrons)
10 crated spare aircraft carried for attrition replacement

Electric equipment
Homing Beacon Type 290
Radar Types 270, 271, 282 and 285



Carriers G, H, I and J, Great Britain Aircraft Carrier laid down 1937

Displacement:
13,290 t light; 13,682 t standard; 15,942 t normal; 17,749 t full load

Dimensions: Length overall / water x beam x draught
661.04 ft / 650.00 ft x 80.00 ft x 18.50 ft (normal load)
201.48 m / 198.12 m x 24.38 m x 5.64 m

Armament:
8 - 4.50" / 114 mm guns (4x2 guns), 45.00lbs / 20.41kg shells, 1935 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, evenly spread, all raised mounts - superfiring
12 - 2.24" / 57.0 mm guns (6x2 guns), 6.00lbs / 2.72kg shells, 1935 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
16 - 1.57" / 40.0 mm guns (2x8 guns), 2.00lbs / 0.91kg shells, 1922 Model
Anti-aircraft guns in deck mounts
on side ends, evenly spread, all raised mounts
36 - 0.66" / 16.8 mm guns (6x6 guns), 0.14lbs / 0.06kg shells, 1935 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 469 lbs / 213 kg
Shells per gun, main battery: 250

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3.00" / 76 mm 160.00 ft / 48.77 m 9.00 ft / 2.74 m
Ends: Unarmoured
Main Belt covers 38 % of normal length
Main belt does not fully cover magazines and engineering spaces

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

- Armour deck: 2.00" / 51 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 92,000 shp / 68,632 Kw = 30.11 kts
Range 12,000nm at 16.00 kts
Bunker at max displacement = 4,067 tons

Complement:
709 - 922

Cost:
£4.753 million / $19.011 million

Distribution of weights at normal displacement:
Armament: 59 tons, 0.4 %
Armour: 1,638 tons, 10.3 %
- Belts: 235 tons, 1.5 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 21 tons, 0.1 %
- Armour Deck: 1,381 tons, 8.7 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 2,550 tons, 16.0 %
Hull, fittings & equipment: 5,494 tons, 34.5 %
Fuel, ammunition & stores: 2,652 tons, 16.6 %
Miscellaneous weights: 3,550 tons, 22.3 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
23,160 lbs / 10,505 Kg = 508.3 x 4.5 " / 114 mm shells or 2.7 torpedoes
Stability (Unstable if below 1.00): 1.12
Metacentric height 4.4 ft / 1.3 m
Roll period: 16.0 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.05
Seaboat quality (Average = 1.00): 1.02

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.580
Length to Beam Ratio: 8.13 : 1
'Natural speed' for length: 25.50 kts
Power going to wave formation at top speed: 54 %
Trim (Max stability = 0, Max steadiness = 100): 69
Bow angle (Positive = bow angles forward): 15.00 degrees
Stern overhang: 3.00 ft / 0.91 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 30.00 ft / 9.14 m
- Forecastle (20 %): 18.00 ft / 5.49 m
- Mid (50 %): 18.00 ft / 5.49 m
- Quarterdeck (15 %): 18.00 ft / 5.49 m
- Stern: 18.00 ft / 5.49 m
- Average freeboard: 18.96 ft / 5.78 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 79.9 %
- Above water (accommodation/working, high = better): 180.5 %
Waterplane Area: 37,326 Square feet or 3,468 Square metres
Displacement factor (Displacement / loading): 148 %
Structure weight / hull surface area: 109 lbs/sq ft or 534 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.11
- Longitudinal: 0.96
- 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

Class Names: HMS Ocean, Theseus, Hercules and Triumph

Belt is box armour around magazines

Hangar deck: 545 x 60 x 17.5ft
Served by two 40 x 33ft lifts with capacity for 15,000lbs
One hydralic accelerator with capacity for 15,000lbs aircraft
Arrestor gear of 8 wires, 1 trickle wire, 2 forward wires and two safety barriers

48 aircraft usually carried (4x 12 aircraft squadrons)
6 crated spare aircraft carried for attrition replacement

Electric equipment
Homing Beacon Type 290
Radar Type 271

The Ocean Class looks perfect for smaller navies like mine

Regarding the Eagle...

9216t at least needed for the 96 planes, 250t for the 10 spare planes, something like 200-300t for the other gear (at least). Total needed would be at least 9700 tons but you only have 7000 tons assigned to the miscellaneous weights. That's good for a maximum of 83 planes without anything else.
Also the maximum this carrier can carry is 94.75 planes so it is not even possible to "usually carry" 96 planes. (750x94.75)/750 = 94.75 planes.

For Eagle I think you'll have problems fitting the entire double hangars onto the design, especially with the increased height. Eagle/Ark IV had 568x60x16 + 452x60x16 on a larger ship than this Eagle. Number of aircraft carried varies with type up to a maximum of 133 x Seafire XVs

Planes are Barracudas and Gloster F.5/34 Gannets?

Well it's not a final design, just seeing where things are going, originally it had a 104 foot beam, probably 72 aircraft will be enough anyway for RN doctrine, I don't really want to build a carrier nearer 35,000 tons. The idea mainly is to improve self-suffiency over the Swiftsure Class until a carrier tender enters service rather than airgroup power. Its clear I've underestiamted weights somewhere...

Yes the aircraft are Gloster Gannets and Fairey Barracudas with a Vickers-Supermarine Sea Otter.

No doubt the small carrier will lend itself to export versions (to the right allies)

Quoted

Originally posted by Hood
Well it's not a final design, just seeing where things are going, originally it had a 104 foot beam, probably 72 aircraft will be enough anyway for RN doctrine, I don't really want to build a carrier nearer 35,000 tons. The idea mainly is to improve self-suffiency over the Swiftsure Class until a carrier tender enters service rather than airgroup power. Its clear I've underestiamted weights somewhere...

Most likely the problem was forgetting that aircraft tonnage is the square of the number of aircraft, or number of aircraft * 25, whichever is greater. That's gotten me a few times. Still a powerful vessel, just not quite as powerful as previously thought.

I do have one question: why no transom stern?

After recognising the Naval Constructors had failed to allow enough growth in the design and that the aircraft complement was overstated the DNC and Admiral Henderson worked together at an improved version. Only six sqaudrons would now be embarked but more tonnage was deveoted to fuel and stores for the aircraft and the hangars were smaller to provide more working spaces in the hull. Although stability suffered along with displacement the addition of a transom stern, at the suggestion of the DNC, compensated.

HMS Eagle Carrier F, Great Britain Aircraft Carrier laid down 1937

Displacement:
26,905 t light; 27,796 t standard; 30,900 t normal; 33,383 t full load

Dimensions: Length overall / water x beam x draught
757.65 ft / 750.00 ft x 94.75 ft x 28.50 ft (normal load)
230.93 m / 228.60 m x 28.88 m x 8.69 m

Armament:
16 - 4.50" / 114 mm guns (8x2 guns), 45.00lbs / 20.41kg shells, 1935 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, evenly spread, all raised mounts - superfiring
16 - 2.24" / 57.0 mm guns (8x2 guns), 6.00lbs / 2.72kg shells, 1935 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
32 - 1.57" / 40.0 mm guns (4x8 guns), 2.00lbs / 0.91kg shells, 1922 Model
Anti-aircraft guns in deck mounts
on side ends, evenly spread, all raised mounts - superfiring
60 - 0.66" / 16.8 mm guns (10x6 guns), 0.14lbs / 0.06kg shells, 1935 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 888 lbs / 403 kg
Shells per gun, main battery: 500

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 4.50" / 114 mm 475.00 ft / 144.78 m 16.00 ft / 4.88 m
Ends: Unarmoured
Main Belt covers 97 % of normal length

- Torpedo Bulkhead:
1.75" / 44 mm 475.00 ft / 144.78 m 26.50 ft / 8.08 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.00" / 25 mm 0.50" / 13 mm 2.00" / 51 mm
2nd: 0.50" / 13 mm - -
3rd: 0.50" / 13 mm - -
4th: 0.50" / 13 mm - -

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

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 140,000 shp / 104,440 Kw = 32.05 kts
Range 12,000nm at 16.00 kts
Bunker at max displacement = 5,587 tons

Complement:
1,164 - 1,514

Cost:
£8.609 million / $34.438 million

Distribution of weights at normal displacement:
Armament: 111 tons, 0.4 %
Armour: 5,190 tons, 16.8 %
- Belts: 1,464 tons, 4.7 %
- Torpedo bulkhead: 815 tons, 2.6 %
- Armament: 46 tons, 0.1 %
- Armour Deck: 2,822 tons, 9.1 %
- Conning Tower: 42 tons, 0.1 %
Machinery: 3,880 tons, 12.6 %
Hull, fittings & equipment: 8,973 tons, 29.0 %
Fuel, ammunition & stores: 3,995 tons, 12.9 %
Miscellaneous weights: 8,750 tons, 28.3 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
44,537 lbs / 20,202 Kg = 977.5 x 4.5 " / 114 mm shells or 6.4 torpedoes
Stability (Unstable if below 1.00): 1.06
Metacentric height 5.2 ft / 1.6 m
Roll period: 17.5 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.07
Seaboat quality (Average = 1.00): 1.29

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.534
Length to Beam Ratio: 7.92 : 1
'Natural speed' for length: 31.72 kts
Power going to wave formation at top speed: 55 %
Trim (Max stability = 0, Max steadiness = 100): 54
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: 36.00 ft / 10.97 m
- Forecastle (20 %): 24.00 ft / 7.32 m
- Mid (50 %): 24.00 ft / 7.32 m
- Quarterdeck (15 %): 24.00 ft / 7.32 m
- Stern: 24.00 ft / 7.32 m
- Average freeboard: 24.96 ft / 7.61 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 96.0 %
- Above water (accommodation/working, high = better): 199.7 %
Waterplane Area: 50,847 Square feet or 4,724 Square metres
Displacement factor (Displacement / loading): 137 %
Structure weight / hull surface area: 124 lbs/sq ft or 604 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.97
- Longitudinal: 1.24
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

Upper hangar deck: 558 x 60 x 17.5ft
Lower hangar deck : 558 x 60 x 17.5ft
Served by two 40 x 33ft lifts with capacity for 20,000lbs
Two hydralic accelerators with capacity for 18,000lbs aircraft
Arrestor gear of 8 wires, 1 trickle wire, 2 forward wires and two safety barriers

72 aircraft usually carried (6 x 12 aircraft squadrons)
10 crated spare aircraft carried for attrition replacement

Electric equipment
Homing Beacon Type 290
Radar Types 270, 271, 282 and 285

Hmmmm. Now I think you've got more tonnage than you need for your airgroup: 72 aircraft need 5184 tons, but that leaves you over 3500 tons of miscellaneous weight. Going to 7 12-plane squadrons would require 7056 tons, which would still leave you almost 1700 tons......

After consulting with his German counterpart the DNC draws up yet another design, this time with some misc weght reduced and put towards another 1in thick armoured deck below the main armour deck as a splinter barrier.

HMS Eagle Carrier F, Great Britain Aircraft Carrier laid down 1937

Displacement:
24,630 t light; 25,472 t standard; 28,412 t normal; 30,764 t full load

Dimensions: Length overall / water x beam x draught
757.65 ft / 750.00 ft x 94.75 ft x 28.50 ft (normal load)
230.93 m / 228.60 m x 28.88 m x 8.69 m

Armament:
16 - 4.50" / 114 mm guns (8x2 guns), 45.00lbs / 20.41kg shells, 1935 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, evenly spread, all raised mounts - superfiring
16 - 2.24" / 57.0 mm guns (8x2 guns), 6.00lbs / 2.72kg shells, 1935 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
32 - 1.57" / 40.0 mm guns (4x8 guns), 2.00lbs / 0.91kg shells, 1922 Model
Anti-aircraft guns in deck mounts
on side ends, evenly spread, all raised mounts - superfiring
60 - 0.66" / 16.8 mm guns (10x6 guns), 0.14lbs / 0.06kg shells, 1935 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 888 lbs / 403 kg
Shells per gun, main battery: 500

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 4.50" / 114 mm 480.00 ft / 146.30 m 16.00 ft / 4.88 m
Ends: Unarmoured
Main Belt covers 98 % of normal length

- Torpedo Bulkhead:
1.75" / 44 mm 480.00 ft / 146.30 m 26.50 ft / 8.08 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.00" / 25 mm 0.50" / 13 mm 2.00" / 51 mm
2nd: 0.50" / 13 mm - -
3rd: 0.50" / 13 mm - -
4th: 0.50" / 13 mm - -

- Armour deck: 4.00" / 102 mm, Conning tower: 2.00" / 51 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 130,000 shp / 96,980 Kw = 32.04 kts
Range 12,000nm at 16.00 kts
Bunker at max displacement = 5,292 tons

Complement:
1,093 - 1,422

Cost:
£7.964 million / $31.855 million

Distribution of weights at normal displacement:
Armament: 111 tons, 0.4 %
Armour: 5,996 tons, 21.1 %
- Belts: 1,473 tons, 5.2 %
- Torpedo bulkhead: 824 tons, 2.9 %
- Armament: 46 tons, 0.2 %
- Armour Deck: 3,613 tons, 12.7 %
- Conning Tower: 40 tons, 0.1 %
Machinery: 3,603 tons, 12.7 %
Hull, fittings & equipment: 8,670 tons, 30.5 %
Fuel, ammunition & stores: 3,781 tons, 13.3 %
Miscellaneous weights: 6,250 tons, 22.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
47,096 lbs / 21,362 Kg = 1,033.7 x 4.5 " / 114 mm shells or 7.2 torpedoes
Stability (Unstable if below 1.00): 1.13
Metacentric height 5.8 ft / 1.8 m
Roll period: 16.5 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.06
Seaboat quality (Average = 1.00): 1.39

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.491
Length to Beam Ratio: 7.92 : 1
'Natural speed' for length: 31.90 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: 36.00 ft / 10.97 m
- Forecastle (20 %): 24.00 ft / 7.32 m
- Mid (50 %): 24.00 ft / 7.32 m
- Quarterdeck (15 %): 24.00 ft / 7.32 m
- Stern: 24.00 ft / 7.32 m
- Average freeboard: 24.96 ft / 7.61 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 88.3 %
- Above water (accommodation/working, high = better): 204.2 %
Waterplane Area: 48,828 Square feet or 4,536 Square metres
Displacement factor (Displacement / loading): 140 %
Structure weight / hull surface area: 123 lbs/sq ft or 602 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.97
- Longitudinal: 1.30
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

Upper hangar deck: 558 x 60 x 17.5ft
Lower hangar deck : 558 x 60 x 17.5ft
Served by two 40 x 33ft lifts with capacity for 20,000lbs
Two hydralic accelerators with capacity for 18,000lbs aircraft
Arrestor gear of 8 wires, 1 trickle wire, 2 forward wires and two safety barriers

72 aircraft usually carried (6 x 12 aircraft squadrons)
10 crated spare aircraft carried for attrition replacement

Electric equipment
Homing Beacon Type 290
Radar Types 270, 271, 282 and 285

Quoted

Originally posted by Hood
After consulting with his German counterpart the DNC draws up yet another design, this time with some misc weght reduced and put towards another 1in thick armoured deck below the main armour deck as a splinter barrier.

Heh, the German designers spent a lot of time consulting with others more experienced than themselves on carrier construction before they tried to design their own.


This one's solid: the extra splinter barrier's no bad thing, the smaller size will make her cheaper to produce, and there's not so much unused tonnage.

Quoted

Armament:
16 - 4.50" / 114 mm guns (8x2 guns), 45.00lbs / 20.41kg shells, 1935 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, evenly spread, all raised mounts - superfiring

Judging by the picture, I doubt these mountings are on the centerline.

I still have concerns about the hangar size given the comparison with Ark IV/Eagle. There would probably be three lifts as well given the aircraft complement. I think argument for taller arguments has been overstated, it just means that your can't carry Corsairs or Wyverns, both of which might not be used in this scenario. Then again I went for a tall hangar on Garibaldi to future-proof for some aircraft on the drawing board.

Why was Henderson overruled with regards to armoured carrier development? With the increased threat level in WW, the argument for an armoured carrier with enclosed hangar makes even more sense.

The figures for the TPC are hugely optimistic compared to the RN's own studies;

F (with armoured flight deck)
600ft 80.5ft 21.4
14,600 tons std
16,900 deep
53,000 shp
2 shafts 27kts
Endurance 7500 nm at 12kts
2*twin 5.25in
4*8 barrel pom poms
15 TSR (hanger capacity)
600 by 81 flight deck
290*40*16 hanger
Lifts 45*22
20000 gallons of petrol
90*500lb bombs
75*250lb bombs
£2.8million

G (without armoured flight deck)
600ft 75ft 21.8
13,500 tons std
15,800 deep
53,000 shp
2 shafts 27.25kts
Endurance 7500 nm at 12kts
2*twin 5.25in
4*8 barrel pom poms
15 TSR (hanger capacity)
600 by 81 flight deck
290*40*16 hanger
Lifts 45*22
20000 gallons of petrol
90*500lb bombs
75*250lb bombs
£2.7 million

J (with armoured flight deck)
600ft 84ft 22
17,000 tons std
20.000 deep
66,000 shp
3 shafts 28kts
Endurance 10000 nm at 12kts
2*twin 5.25in
4*8 barrel pom poms
24 TSR (hanger capacity)
660 by 84 flight deck
436*60*16 hanger
Lifts 45*22
40000 gallons of petrol
180*500lb bombs
150*250lb bombs
£3 million

Armour notes;
Designs f and J had 2.5in NC steel flight deck covering full width of Flight deck and 400/480ft respectively in length (covering full hangers in both and then extending aft beyond). Both had 2in forward bulkhead. For an extra 600 tons design J could have a 3in flightdeck. All NC.
For F and J Belt 4.5in C armour covering Mags and machinery which ran from HD to 3.5 ft below waterline. Reducing this belt to 3in would save 220 tons and £45000.
Design G had similar protection to Ark Royal with 3.5 in belt.

The Admiralty looked at the aircraft it used in 1916 and the ones in use today (1936) and noted the massive increase in capability, engine power, speed, weight and size and then thought what would an aircraft in 1956 look like if these trends continue. Thais drove the size of the carrrier needed since it has a life of 20-25 years.

The armoured carrier is a curious thing. If you believe the carrier is a floating airbase then it makes sense to protect it. The question is which is better at keeping a carrier operational, one with 4in thick flight decks with a handful of fighters and strike aircraft or one that can carry 30-40 fighters for self-protection and another 20-40 strike aircraft? Armour is passive, it costs weight and only is useful in defence, better to spend the weight in aircraft which can shoot down enemy bombers and bombers which can cripple the enemy. Ilustrious et al were good at absorbing damage but so were the Essex Class, yet they only had 30 or so aircraft (the Implacables carried more but their airgroups were still were dwarfed by most other carriers of similar size).

Only one carrier is desired so it makes sense not to introduce a totally new type of carrier. The next two tentative carriers for 1939 might be armoured carriers of some form.

The TPC is not an armoured carrier, it is a Colossus clone with some deck armour over the engines and magazines and box armour around the magazines. Still the figures you quote amply show the limitations of armoured carriers...

Most of the aircraft complement difference comes from conservative practise in the FAA. The Essex Class (considerably bigger than Illustrious) could manage up to 100 aircraft, but no way of effectively operating that number. ~100 was the limit for effective operations on the 1.5x Midways. The effective operations number is about 80 aircraft. For Illustrious, the figure was 36 ac,all in the hangar. This was relaxed with the deck park being used (standard USN practice) and the aircraft complement increased to a still conservative 60 planes. And this is on a smaller ship than an Essex so the difference is probably only around 15-20% at most. Note also that ARK III was a 72ac ship but in practice only 48ac could be operated effectively.

Quoted

The TPC is not an armoured carrier, it is a Colossus clone with some deck armour over the engines and magazines and box armour around the magazines. Still the figures you quote amply show the limitations of armoured carriers...

The point is more that the specs you can get in SS are massively more than what was acheived in practice. For a simple Colossus clone she's massively more capable.

I agree with regards to aircraft development. Another argument for larger carriers. My favourite is simply "Small Ships Sink Soon"

I like the choice of AA weapons on the carriers.
The real UK did have 57mm QF guns (aka 6pdr's) and 40mm's (aka 2pdr's).

Which brings up a slightly OT question -
If a country refers to it's armament by pounds (2 pdr's, etc) how can that be shown in springsharp?
There was a difference in the 2pdr vs. the 40mm.
The UK used 2pdr pom-poms which weren't exactly the same in weight/performance as a comparable 40mm multi barrel mount.

In mid 1936 the Admiralty asked the DNC to go over the plans for the partial reconstruction of the QE Class battleships and a few minor improvements were made to the drawings and from July one of the class will begin her reconstruction.

HMS Queen Elizabeth, Royal Navy Battleship laid down 1912 (Engine 1936)

Displacement:
31,417 t light; 33,522 t standard; 35,165 t normal; 36,480 t full load

Dimensions: Length overall / water x beam x draught
654.22 ft / 643.30 ft x 90.00 ft (Bulges 102.00 ft) x 30.80 ft (normal load)
199.41 m / 196.08 m x 27.43 m (Bulges 31.09 m) x 9.39 m

Armament:
8 - 15.00" / 381 mm guns (4x2 guns), 1,938.00lbs / 879.06kg shells, 1912 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread, 2 raised mounts - superfiring
20 - 4.50" / 114 mm guns (10x2 guns), 45.00lbs / 20.41kg shells, 1935 Model
Dual purpose guns in deck mounts with hoists
on side ends, evenly spread
12 - 2.24" / 57.0 mm guns (6x2 guns), 6.00lbs / 2.72kg shells, 1935 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 4 raised mounts
32 - 1.57" / 40.0 mm guns (4x8 guns), 2.00lbs / 0.91kg shells, 1922 Model
Anti-aircraft guns in deck mounts
on side ends, evenly spread, all raised mounts - superfiring
24 - 0.66" / 16.8 mm guns (4x6 guns), 0.14lbs / 0.06kg shells, 1935 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 16,543 lbs / 7,504 kg
Shells per gun, main battery: 150

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 15.0" / 381 mm 440.00 ft / 134.11 m 12.00 ft / 3.66 m
Ends: Unarmoured
Upper: 6.00" / 152 mm 410.00 ft / 124.97 m 8.00 ft / 2.44 m
Main Belt covers 105 % of normal length

- Torpedo Bulkhead and Bulges:
3.50" / 89 mm 410.00 ft / 124.97 m 27.00 ft / 8.23 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 13.0" / 330 mm 8.00" / 203 mm 8.00" / 203 mm
2nd: 2.00" / 51 mm 1.00" / 25 mm 4.00" / 102 mm
3rd: 0.50" / 13 mm - -
4th: 0.50" / 13 mm - -
5th: 0.50" / 13 mm - -

- Armour deck: 6.50" / 165 mm, Conning tower: 13.00" / 330 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 100,000 shp / 74,600 Kw = 26.98 kts
Range 10,000nm at 12.00 kts
Bunker at max displacement = 2,958 tons

Complement:
1,283 - 1,669

Cost:
£3.020 million / $12.079 million

Distribution of weights at normal displacement:
Armament: 1,818 tons, 5.2 %
Armour: 13,474 tons, 38.3 %
- Belts: 4,245 tons, 12.1 %
- Torpedo bulkhead: 1,434 tons, 4.1 %
- Armament: 2,359 tons, 6.7 %
- Armour Deck: 5,135 tons, 14.6 %
- Conning Tower: 301 tons, 0.9 %
Machinery: 2,806 tons, 8.0 %
Hull, fittings & equipment: 13,069 tons, 37.2 %
Fuel, ammunition & stores: 3,749 tons, 10.7 %
Miscellaneous weights: 250 tons, 0.7 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
48,934 lbs / 22,196 Kg = 29.0 x 15.0 " / 381 mm shells or 8.7 torpedoes
Stability (Unstable if below 1.00): 1.08
Metacentric height 4.9 ft / 1.5 m
Roll period: 19.3 seconds
Steadiness - As gun platform (Average = 50 %): 60 %
- Recoil effect (Restricted arc if above 1.00): 0.80
Seaboat quality (Average = 1.00): 1.16

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.609
Length to Beam Ratio: 6.31 : 1
'Natural speed' for length: 25.36 kts
Power going to wave formation at top speed: 55 %
Trim (Max stability = 0, Max steadiness = 100): 52
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: 30.00 ft / 9.14 m
- Forecastle (20 %): 28.00 ft / 8.53 m
- Mid (66 %): 25.00 ft / 7.62 m (16.00 ft / 4.88 m aft of break)
- Quarterdeck (16 %): 16.00 ft / 4.88 m
- Stern: 16.00 ft / 4.88 m
- Average freeboard: 23.39 ft / 7.13 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 87.2 %
- Above water (accommodation/working, high = better): 149.3 %
Waterplane Area: 42,702 Square feet or 3,967 Square metres
Displacement factor (Displacement / loading): 104 %
Structure weight / hull surface area: 200 lbs/sq ft or 976 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.95
- Longitudinal: 1.77
- Overall: 1.01
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent

Refit Changes 1935:

Replacement of casemates with ten twin 4.5in DP mounts
Six twin 6pdr AA mounts (two on quarterdeck, rest on after superstructure)
Four octuple 2pdr AA fitted
Four sextuple MG mounts fitted (two on bridge and one on each B and X turret)
Two new main directors and four new HACS fitted
Type 281 and Type 79 RDF fitted
New 15in external belt
Removal of end belts
Extra 1.5in torpedo bulkhead fitted inside new bulge
Extra 1in added to main deck armour and new 1.5in burster deack added along full length of ship
New bows fitted
New boilers and turbines fitted, speed increased to 27kts
Extra bunkerage fitted inside bulges


Also the shocking poor state of the AA defences of the Resolution Class will be addressed by a 5% refit which will add two 2pdr octuple mounts and four .661in HMG sextuple mounts. The existing HA fire control system will be used, HACS will not be installed as the remaining lifespan of the class does not justify the costs.


The plan to build the 600 Ton Colonial boat has been put back as the First Sea Lord felt the submarine situation had to be improved in order to retire older Great War era boats still in service.

The DNC and his submarine team has modernised the P Class design with a stronger and larger hull for increased range and a more potent 4in gun for anti-merchant shelling. Many older officers have objected to the U name and pennents but the Admiralty has insisted on the numbers. No rear tube was fitted owing to the single shaft design and the lack of space in the stern. Tactically it is not thought to pose a serious problem. At least two flotillas (10 boats) will be built this year.

U Class , Great Britain Coastal Submarine laid down 1936

Displacement:
665 t light; 683 t standard; 746 t normal; 797 t full load

Dimensions: Length overall / water x beam x draught
170.00 ft / 170.00 ft x 21.00 ft x 13.30 ft (normal load)
51.82 m / 51.82 m x 6.40 m x 4.05 m

Armament:
1 - 4.00" / 102 mm guns in single mounts, 31.00lbs / 14.06kg shells, 1930 Model
Quick firing gun in deck mount
on centreline forward
2 - 0.66" / 16.8 mm guns (1x2 guns), 0.14lbs / 0.06kg shells, 1935 Model
Machine guns in deck mount
on centreline amidships
Weight of broadside 31 lbs / 14 kg
Shells per gun, main battery: 150
4 - 21.0" / 533.4 mm submerged torpedo tubes

Machinery:
Diesel Internal combustion generators plus batteries,
Electric motors, 1 shaft, 1,850 shp / 1,380 Kw = 16.04 kts
Range 6,000nm at 10.00 kts
Bunker at max displacement = 114 tons

Complement:
70 - 92

Cost:
£0.179 million / $0.716 million

Distribution of weights at normal displacement:
Armament: 4 tons, 0.5 %
Machinery: 52 tons, 7.0 %
Hull, fittings & equipment: 429 tons, 57.5 %
Fuel, ammunition & stores: 81 tons, 10.9 %
Miscellaneous weights: 180 tons, 24.1 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
354 lbs / 161 Kg = 11.1 x 4.0 " / 102 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.00
Metacentric height 0.5 ft / 0.1 m
Roll period: 12.7 seconds
Steadiness - As gun platform (Average = 50 %): 0 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 0.00

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.550
Length to Beam Ratio: 8.10 : 1
'Natural speed' for length: 13.04 kts
Power going to wave formation at top speed: 56 %
Trim (Max stability = 0, Max steadiness = 100): 50
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: 0.00 ft / 0.00 m
- Forecastle (20 %): 0.00 ft / 0.00 m
- Mid (50 %): 0.00 ft / 0.00 m
- Quarterdeck (15 %): 0.00 ft / 0.00 m
- Stern: 0.00 ft / 0.00 m
- Average freeboard: 0.00 ft / 0.00 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 102.1 %
- Above water (accommodation/working, high = better): 0.0 %
Waterplane Area: 2,416 Square feet or 224 Square metres
Displacement factor (Displacement / loading): 236 %
Structure weight / hull surface area: 117 lbs/sq ft or 571 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 4.01
- Longitudinal: 2.98
- Overall: 3.21
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is extremely poor
Ship has quick, lively roll, not a steady gun platform
Caution: Lacks seaworthiness - very limited seakeeping ability

Operational diving depth 321 feet
Emergency diving depth 513 feet
Crush depth 802 feet

As always, I have problems with replacing the main belt armour. Really you're limited to the historical incremental scheme, it would be too difficult and expensive to do much else. Thicker deck armour is easier as you add an extra laminate over the top. I'm pretty sure that the historical refit was the maximum that could be done with the ships as well - different secondary and tertiary batteries might be the only real changes that could be made. I doubt that there's room for 25% more power.