WesWorld

A proposed refit for the "Big Six". The ships get a new extended bow, new engines, bulges, heavier deck armor, and (at long last) the triple 14" mounts are replaced with twin 16" mountings as was planned for the Colorados.


USS Tennessee, United States Battleship laid down 1917 (Engine 1936)

Displacement:
31,138 t light; 32,891 t standard; 34,544 t normal; 35,867 t full load

Dimensions: Length overall / water x beam x draught
655.17 ft / 630.00 ft x 97.40 ft (Bulges 108.00 ft) x 28.80 ft (normal load)
199.70 m / 192.02 m x 29.69 m (Bulges 32.92 m) x 8.78 m

Armament:
8 - 16.00" / 406 mm guns (4x2 guns), 2,250.00lbs / 1,020.58kg shells, 1936 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread, 2 raised mounts - superfiring
16 - 5.00" / 127 mm guns (8x2 guns), 55.18lbs / 25.03kg shells, 1936 Model
Dual purpose guns in deck mounts with hoists
on side, all amidships, 4 raised mounts - superfiring
48 - 1.10" / 27.9 mm guns (12x4 guns), 0.67lbs / 0.30kg shells, 1936 Model
Anti-aircraft guns in deck mounts
on side, all amidships, 4 raised mounts - superfiring
16 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1936 Model
Machine guns in deck mounts
on side, evenly spread, 12 raised mounts
Weight of broadside 18,916 lbs / 8,580 kg
Shells per gun, main battery: 100

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 13.5" / 343 mm 409.50 ft / 124.82 m 11.84 ft / 3.61 m
Ends: Unarmoured
Main Belt covers 100 % of normal length

- Torpedo Bulkhead and Bulges:
3.50" / 89 mm 409.50 ft / 124.82 m 26.70 ft / 8.14 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 18.0" / 457 mm 6.00" / 152 mm 13.0" / 330 mm
2nd: 2.00" / 51 mm 1.00" / 25 mm 2.00" / 51 mm
3rd: 0.50" / 13 mm - -
4th: 0.50" / 13 mm - -

- Armour deck: 5.50" / 140 mm, Conning tower: 16.00" / 406 mm

Machinery:
Oil fired boilers, steam turbines,
Electric motors, 4 shafts, 87,716 shp / 65,436 Kw = 26.00 kts
Range 15,000nm at 10.00 kts
Bunker at max displacement = 2,975 tons

Complement:
1,266 - 1,647

Cost:
£5.933 million / $23.732 million

Distribution of weights at normal displacement:
Armament: 2,177 tons, 6.3 %
Armour: 12,519 tons, 36.2 %
- Belts: 2,865 tons, 8.3 %
- Torpedo bulkhead: 1,416 tons, 4.1 %
- Armament: 3,234 tons, 9.4 %
- Armour Deck: 4,639 tons, 13.4 %
- Conning Tower: 366 tons, 1.1 %
Machinery: 2,461 tons, 7.1 %
Hull, fittings & equipment: 13,730 tons, 39.7 %
Fuel, ammunition & stores: 3,406 tons, 9.9 %
Miscellaneous weights: 250 tons, 0.7 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
44,617 lbs / 20,238 Kg = 21.8 x 16.0 " / 406 mm shells or 8.3 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 5.8 ft / 1.8 m
Roll period: 18.8 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.62
Seaboat quality (Average = 1.00): 1.00

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.617
Length to Beam Ratio: 5.83 : 1
'Natural speed' for length: 25.10 kts
Power going to wave formation at top speed: 54 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 40.00 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 %): 24.00 ft / 7.32 m
- Mid (57 %): 24.00 ft / 7.32 m (16.00 ft / 4.88 m aft of break)
- Quarterdeck (15 %): 16.00 ft / 4.88 m
- Stern: 16.00 ft / 4.88 m
- Average freeboard: 21.04 ft / 6.41 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 90.4 %
- Above water (accommodation/working, high = better): 141.0 %
Waterplane Area: 45,596 Square feet or 4,236 Square metres
Displacement factor (Displacement / loading): 98 %
Structure weight / hull surface area: 212 lbs/sq ft or 1,036 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.95
- Longitudinal: 1.55
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent

50 tons for aircraft
50 tons for radar
150 tons for growth

26 knots? Impressive!

The bow got lengthened, and newer engines. Not to mention there's enough of this class to consider a different fleet speed than the preceding 21 knots, though they wouldn't be able to use it unless they were operating without any of the older classes.

Does the replacement of the triple 14" turrets require barbet alterations?

For the historical ships, 26knts would give them the seakeeping abilities of a submarine. Even 21knts was pushing things. The new bow will do some to compensate, but not much.

'cause Springsharp sez so... no "wet forward" warning, seakeeping of 1.00

Now, its not up to Russian seakeeping standards, but then I've got the North Cape and the North Pacific as my most likely area of operations.

The US dosen't.

Quoted

Does the replacement of the triple 14" turrets require barbet alterations?

Don't think so. Hazegray.org says the Colorado class, with 8x16", was virtually identical with the Tennesee class, with 12x14". Their hull dimensions are the same, if that's an indication.

http://www.hazegray.org/navhist/battleships/us_dr.htm#bb43

As Adm K. said, switching back to the originally planned twin 16" shouldn't require any modifications of the barbettes. After all, 4 of the ships were designed to have the twin 16" mountings from the start (like the Lexingtons) and were changed over to the triple 14" mounts when the Cleito Treaty said no 16" guns.

No, the seakeeping is not the best, but historically that wasn't as much a priority for the USN as it was (or should have been) for some other fleets.

And a possible rebuild for the Lexingtons:

USS Lexington, United States Battlecruiser laid down 1919 (Engine 1936)

Displacement:
42,607 t light; 44,843 t standard; 48,061 t normal; 50,635 t full load

Dimensions: Length overall / water x beam x draught
873.11 ft / 850.00 ft x 100.00 ft (Bulges 118.00 ft) x 31.00 ft (normal load)
266.12 m / 259.08 m x 30.48 m (Bulges 35.97 m) x 9.45 m

Armament:
8 - 16.00" / 406 mm guns (4x2 guns), 2,250.00lbs / 1,020.58kg shells, 1936 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread, 2 raised mounts - superfiring
16 - 5.00" / 127 mm guns (8x2 guns), 55.18lbs / 25.03kg shells, 1938 Model
Dual purpose guns in deck mounts with hoists
on side, all amidships, 4 raised mounts - superfiring
56 - 1.10" / 27.9 mm guns (14x4 guns), 0.67lbs / 0.30kg shells, 1938 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 6 raised mounts - superfiring
12 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1919 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 18,921 lbs / 8,582 kg
Shells per gun, main battery: 120

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 12.0" / 305 mm 624.00 ft / 190.20 m 12.00 ft / 3.66 m
Ends: Unarmoured
Main Belt covers 113 % of normal length

- Torpedo Bulkhead and Bulges:
3.00" / 76 mm 550.00 ft / 167.64 m 28.74 ft / 8.76 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 13.0" / 330 mm 6.00" / 152 mm 12.0" / 305 mm
2nd: 2.50" / 64 mm 2.50" / 64 mm 2.50" / 64 mm
3rd: 1.00" / 25 mm - -
4th: 0.50" / 13 mm - -

- Armour deck: 4.50" / 114 mm, Conning tower: 12.00" / 305 mm

Machinery:
Oil fired boilers, steam turbines,
Electric motors, 4 shafts, 219,703 shp / 163,899 Kw = 32.50 kts
Range 10,000nm at 15.00 kts
Bunker at max displacement = 5,791 tons

Complement:
1,622 - 2,109

Cost:
£9.128 million / $36.511 million

Distribution of weights at normal displacement:
Armament: 2,178 tons, 4.5 %
Armour: 14,315 tons, 29.8 %
- Belts: 3,724 tons, 7.7 %
- Torpedo bulkhead: 1,755 tons, 3.7 %
- Armament: 3,598 tons, 7.5 %
- Armour Deck: 4,897 tons, 10.2 %
- Conning Tower: 342 tons, 0.7 %
Machinery: 6,165 tons, 12.8 %
Hull, fittings & equipment: 19,699 tons, 41.0 %
Fuel, ammunition & stores: 5,454 tons, 11.3 %
Miscellaneous weights: 250 tons, 0.5 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
64,450 lbs / 29,234 Kg = 31.5 x 16.0 " / 406 mm shells or 10.4 torpedoes
Stability (Unstable if below 1.00): 1.18
Metacentric height 6.8 ft / 2.1 m
Roll period: 19.0 seconds
Steadiness - As gun platform (Average = 50 %): 52 %
- Recoil effect (Restricted arc if above 1.00): 0.52
Seaboat quality (Average = 1.00): 1.04

Hull form characteristics:
Hull has low quarterdeck
Block coefficient: 0.541
Length to Beam Ratio: 7.20 : 1
'Natural speed' for length: 29.15 kts
Power going to wave formation at top speed: 53 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 34.20 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 34.00 ft / 10.36 m
- Forecastle (20 %): 27.70 ft / 8.44 m
- Mid (50 %): 25.70 ft / 7.83 m
- Quarterdeck (18 %): 18.70 ft / 5.70 m (25.70 ft / 7.83 m before break)
- Stern: 18.70 ft / 5.70 m
- Average freeboard: 25.60 ft / 7.80 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 96.6 %
- Above water (accommodation/working, high = better): 180.9 %
Waterplane Area: 58,823 Square feet or 5,465 Square metres
Displacement factor (Displacement / loading): 108 %
Structure weight / hull surface area: 219 lbs/sq ft or 1,070 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.98
- Longitudinal: 1.19
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent

100 tons reserved for aircraft
50 tons reserved for radar
100 tons reserved for growth