WesWorld

Australia will be exchanging HMS Iron Duke for the turrets from the I's. The turrets will be used in a pair of battlecruisers which will replace Tiger and Princess Royal.

HMAS Wombat, Australian Battlecruiser laid down 1944

Displacement:
27,601 t light; 29,018 t standard; 31,693 t normal; 33,833 t full load

Dimensions: Length overall / water x beam x draught
720.00 ft / 720.00 ft x 90.00 ft x 31.70 ft (normal load)
219.46 m / 219.46 m x 27.43 m x 9.66 m

Armament:
6 - 15.00" / 381 mm guns (2x3 guns), 1,687.50lbs / 765.44kg shells, 1928 Model
Breech loading guns in turrets (on barbettes)
on centreline, all forward, 1 raised mount - superfiring
24 - 4.70" / 119 mm guns (12x2 guns), 51.91lbs / 23.55kg shells, 1944 Model
Breech loading guns in deck mounts with hoists
on side, evenly spread, 4 raised mounts
28 - 1.57" / 40.0 mm guns (7x4 guns), 1.95lbs / 0.89kg shells, 1944 Model
Breech loading guns in deck mounts
on side, evenly spread, all raised mounts
20 - 0.79" / 20.0 mm guns (10x2 guns), 0.24lbs / 0.11kg shells, 1944 Model
Breech loading guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 11,430 lbs / 5,185 kg
Shells per gun, main battery: 120

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 12.0" / 305 mm 420.00 ft / 128.02 m 12.00 ft / 3.66 m
Ends: Unarmoured
Main Belt covers 90 % of normal length

- Torpedo Bulkhead:
1.00" / 25 mm 420.00 ft / 128.02 m 21.00 ft / 6.40 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 12.0" / 305 mm 7.00" / 178 mm 12.0" / 305 mm
2nd: 1.20" / 30 mm - -

- Armour deck: 5.00" / 127 mm, Conning tower: 9.00" / 229 mm

Machinery:
Oil fired boilers, steam turbines,
Electric motors, 4 shafts, 126,453 shp / 94,334 Kw = 31.00 kts
Range 12,500nm at 15.00 kts
Bunker at max displacement = 4,815 tons

Complement:
1,186 - 1,543

Cost:
£17.614 million / $70.457 million

Distribution of weights at normal displacement:
Armament: 1,429 tons, 4.5 %
Armour: 9,577 tons, 30.2 %
- Belts: 2,629 tons, 8.3 %
- Torpedo bulkhead: 326 tons, 1.0 %
- Armament: 2,113 tons, 6.7 %
- Armour Deck: 4,313 tons, 13.6 %
- Conning Tower: 194 tons, 0.6 %
Machinery: 3,229 tons, 10.2 %
Hull, fittings & equipment: 13,217 tons, 41.7 %
Fuel, ammunition & stores: 4,091 tons, 12.9 %
Miscellaneous weights: 220 tons, 0.5 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
50,784 lbs / 23,035 Kg = 30.1 x 15.0 " / 381 mm shells or 6.4 torpedoes
Stability (Unstable if below 1.00): 1.09
Metacentric height 5.0 ft / 1.5 m
Roll period: 16.9 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.87
Seaboat quality (Average = 1.00): 1.26

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.540
Length to Beam Ratio: 8.00 : 1
'Natural speed' for length: 31.03 kts
Power going to wave formation at top speed: 55 %
Trim (Max stability = 0, Max steadiness = 100): 40
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: 35.00 ft / 10.67 m
- Forecastle (22 %): 27.00 ft / 8.23 m
- Mid (40 %): 27.00 ft / 8.23 m
- Quarterdeck (22 %): 25.00 ft / 7.62 m
- Stern: 25.00 ft / 7.62 m
- Average freeboard: 26.88 ft / 8.19 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 88.0 %
- Above water (accommodation/working, high = better): 197.1 %
Waterplane Area: 46,632 Square feet or 4,332 Square metres
Displacement factor (Displacement / loading): 115 %
Structure weight / hull surface area: 186 lbs/sq ft or 908 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.93
- Longitudinal: 1.99
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Good seaboat, rides out heavy weather easily

I would presume that you really mean to fit a dual purpose secondary battery and antiaircraft guns in the tertiary battery, and not straight breechloaders... but I hate to make assumptions.

I kinda get the sense this would be more impressive with a bit more belt armor and another knot of speed. But I also sense that this would require S3.5 or D3.5 infrastructure Australia probably doesn't have.

I don't like more armor, but another knot is pretty doable, and fixing the secondaries:

HMAS Wombat, Australia Battlecruiser laid down 1944

Displacement:
28,406 t light; 29,840 t standard; 32,493 t normal; 34,615 t full load

Dimensions: Length overall / water x beam x draught
720.00 ft / 720.00 ft x 90.00 ft x 32.50 ft (normal load)
219.46 m / 219.46 m x 27.43 m x 9.91 m

Armament:
6 - 15.00" / 381 mm guns (2x3 guns), 1,690.00lbs / 766.57kg shells, 1928 Model
Breech loading guns in turrets (on barbettes)
on centreline, all forward, 1 raised mount - superfiring
24 - 4.70" / 119 mm guns (12x2 guns), 52.00lbs / 23.59kg shells, 1944 Model
Dual purpose guns in deck mounts with hoists
on side, evenly spread, 4 raised mounts
28 - 1.57" / 40.0 mm guns (7x4 guns), 1.95lbs / 0.89kg shells, 1944 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
20 - 0.79" / 20.0 mm guns (10x2 guns), 0.24lbs / 0.11kg shells, 1944 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 11,448 lbs / 5,193 kg
Shells per gun, main battery: 120

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 12.0" / 305 mm 440.00 ft / 134.11 m 12.00 ft / 3.66 m
Ends: Unarmoured
Main Belt covers 94 % of normal length

- Torpedo Bulkhead:
1.00" / 25 mm 440.00 ft / 134.11 m 21.00 ft / 6.40 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 12.0" / 305 mm 7.00" / 178 mm 12.0" / 305 mm
2nd: 1.20" / 30 mm - -

- Armour deck: 5.00" / 127 mm, Conning tower: 9.00" / 229 mm

Machinery:
Oil fired boilers, steam turbines,
Electric motors, 4 shafts, 145,154 shp / 108,285 Kw = 32.00 kts
Range 12,200nm at 15.00 kts
Bunker at max displacement = 4,775 tons

Complement:
1,209 - 1,573

Cost:
£18.254 million / $73.014 million

Distribution of weights at normal displacement:
Armament: 1,429 tons, 4.4 %
Armour: 9,696 tons, 29.8 %
- Belts: 2,730 tons, 8.4 %
- Torpedo bulkhead: 342 tons, 1.1 %
- Armament: 2,113 tons, 6.5 %
- Armour Deck: 4,313 tons, 13.3 %
- Conning Tower: 197 tons, 0.6 %
Machinery: 3,707 tons, 11.4 %
Hull, fittings & equipment: 13,235 tons, 40.7 %
Fuel, ammunition & stores: 4,086 tons, 12.6 %
Miscellaneous weights: 340 tons, 1.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
48,022 lbs / 21,783 Kg = 28.5 x 15.0 " / 381 mm shells or 5.9 torpedoes
Stability (Unstable if below 1.00): 1.06
Metacentric height 4.8 ft / 1.5 m
Roll period: 17.3 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.88
Seaboat quality (Average = 1.00): 1.15

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.540
Length to Beam Ratio: 8.00 : 1
'Natural speed' for length: 31.03 kts
Power going to wave formation at top speed: 56 %
Trim (Max stability = 0, Max steadiness = 100): 43
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: 35.00 ft / 10.67 m
- Forecastle (22 %): 27.00 ft / 8.23 m
- Mid (40 %): 27.00 ft / 8.23 m
- Quarterdeck (22 %): 25.00 ft / 7.62 m
- Stern: 25.00 ft / 7.62 m
- Average freeboard: 26.88 ft / 8.19 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 92.8 %
- Above water (accommodation/working, high = better): 193.4 %
Waterplane Area: 46,632 Square feet or 4,332 Square metres
Displacement factor (Displacement / loading): 113 %
Structure weight / hull surface area: 185 lbs/sq ft or 904 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.92
- Longitudinal: 1.99
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent

I assume these ships are to supplement the RN Eastern Fleet, I am surprised they aren't using the new British 15in shells.

Not a bad ship for 28,000 tons, has decent speed and range, pretty powerful secondary armament and the deck armour is ok, a thin belt of 12in might not pose too many problems given the greater air-threat these days.
What will be aft given the all-forward main battery layout?

Good point Jason, actually looking back the original SS report Gravina made for the Invincible and Inflexible the guns are 1921 model simmed for 1,687lb shells which was probably a oversight he made, since this is the default setting. I'm supposing they would have been normal 1,938lb shells.

Quoted

6 - 15,00" / 381 mm guns (2x3 guns), 1.687,50lbs / 765,44kg shells, 1921 Model
Breech loading guns in turrets (on barbettes)

Also, although your using the turrets, I notice the armour is different. Are you just using the mechanism and replacing the armoured turret?

Quoted

Main: 14,0" / 356 mm 8,00" / 203 mm 7,00" / 178 mm

Oversight on my part, now fixed with correct turrets and shells.

Aft will have expanded seaplane and gyro/helo facilities.

HMAS Wombat, Australia Battlecruiser laid down 1944

Displacement:
28,201 t light; 29,881 t standard; 32,493 t normal; 34,582 t full load

Dimensions: Length overall / water x beam x draught
720.00 ft / 720.00 ft x 90.00 ft x 32.50 ft (normal load)
219.46 m / 219.46 m x 27.43 m x 9.91 m

Armament:
6 - 15.00" / 381 mm guns (2x3 guns), 1,938.00lbs / 879.06kg shells, 1921 Model
Breech loading guns in turrets (on barbettes)
on centreline, all forward, 1 raised mount - superfiring
24 - 4.70" / 119 mm guns (12x2 guns), 52.00lbs / 23.59kg shells, 1944 Model
Dual purpose guns in deck mounts with hoists
on side, evenly spread, 4 raised mounts
28 - 1.57" / 40.0 mm guns (7x4 guns), 1.95lbs / 0.89kg shells, 1944 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
20 - 0.79" / 20.0 mm guns (10x2 guns), 0.24lbs / 0.11kg shells, 1944 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 12,936 lbs / 5,867 kg
Shells per gun, main battery: 140

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 12.0" / 305 mm 441.00 ft / 134.42 m 12.00 ft / 3.66 m
Ends: Unarmoured
Main Belt covers 94 % of normal length

- Torpedo Bulkhead:
1.00" / 25 mm 441.00 ft / 134.42 m 21.00 ft / 6.40 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 14.0" / 356 mm 8.00" / 203 mm 7.00" / 178 mm
2nd: 1.20" / 30 mm - -

- Armour deck: 5.00" / 127 mm, Conning tower: 9.00" / 229 mm

Machinery:
Oil fired boilers, steam turbines,
Electric motors, 4 shafts, 145,154 shp / 108,285 Kw = 32.00 kts
Range 12,000nm at 15.00 kts
Bunker at max displacement = 4,701 tons

Complement:
1,209 - 1,573

Cost:
£18.205 million / $72.820 million

Distribution of weights at normal displacement:
Armament: 1,429 tons, 4.4 %
Armour: 9,160 tons, 28.2 %
- Belts: 2,735 tons, 8.4 %
- Torpedo bulkhead: 343 tons, 1.1 %
- Armament: 1,572 tons, 4.8 %
- Armour Deck: 4,313 tons, 13.3 %
- Conning Tower: 197 tons, 0.6 %
Machinery: 3,707 tons, 11.4 %
Hull, fittings & equipment: 13,495 tons, 41.5 %
Fuel, ammunition & stores: 4,292 tons, 13.2 %
Miscellaneous weights: 410 tons, 1.3 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
47,970 lbs / 21,759 Kg = 28.4 x 15.0 " / 381 mm shells or 5.8 torpedoes
Stability (Unstable if below 1.00): 1.09
Metacentric height 5.0 ft / 1.5 m
Roll period: 16.8 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.97
Seaboat quality (Average = 1.00): 1.17

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.540
Length to Beam Ratio: 8.00 : 1
'Natural speed' for length: 31.03 kts
Power going to wave formation at top speed: 56 %
Trim (Max stability = 0, Max steadiness = 100): 43
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: 35.00 ft / 10.67 m
- Forecastle (22 %): 27.00 ft / 8.23 m
- Mid (40 %): 27.00 ft / 8.23 m
- Quarterdeck (22 %): 25.00 ft / 7.62 m
- Stern: 25.00 ft / 7.62 m
- Average freeboard: 26.88 ft / 8.19 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 94.1 %
- Above water (accommodation/working, high = better): 193.4 %
Waterplane Area: 46,632 Square feet or 4,332 Square metres
Displacement factor (Displacement / loading): 114 %
Structure weight / hull surface area: 189 lbs/sq ft or 922 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.92
- Longitudinal: 2.07
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent