USS Iowa
Sketchup done by
@Migrant_Coconut for Reach For the Skies
Iowa's home timeline
Completed just in time for the War of 1897, Iowa (BB-3) was a one-off ship that gave her name to an entire generation of battleships. At first glance, it bore some resemblance to SMS Brandenburg, with 6 big guns as well as its 6 8" guns, but unlike the German ship, one 12" and 1 8" turret were superimposed over the other 12" turrets, and all of the 12" guns were the same length. She was expensive, and the navy had to give up the third "Indiana" class in budget negotiations, and came close to losing an armored cruiser.
The oil fired boilers were another innovation, but unlike the guns, were not visible to the general public. The raw firepower and 17 knot speed speed elicited some concern from the Royal Navy, and the British public, but it was portrayed publicly as one expensive experimental ship, and of no threat to Britania ruling the waves. In the halls of the men who design and build the ships, however, there was mild consternation. That mild consternation turned to near panic when the ship first engaged an enemy.
The firepower was what everyone saw, and the fire control system was nicely hidden, budget-wise, in Skywatch's programs, so no one knew about the new gadgets that were the heart of the ship. It incorporated the fruits of "Skywatch," the program developed to discover threatening asteroids and assess their orbits. Using advanced gyroscopic systems to stabilize the main and secondary guns, and a simplified version of the sophisticated
analytikí michaní used for computing orbits, Iowa could hit with reasonable accuracy at ranges up to 5 miles with both the 12" and 8" guns. Under good conditions, hits could be achieved at ranges reported up to 8 miles.
In the first naval battle in the war of 1897, Iowa engaged at a range of 5 miles, the 12" guns firing at 1 target and the 8" guns at another, as the difficulty of distinguishing between 8 and 12" shell splashes had been discovered in exercises. One enemy battleship was crippled, and later forced to strike, and an armored cruiser blew up and sunk from plunging fire from the secondary turrets.
One ship blown up at what could be seen as a ridiculous range could be attributed to a crack crew and good luck, but Iowa shifted targets, sinking two more armored cruisers before the enemy forces rang up full speed and retreated. None of the other American ships even opened fire. The rapid destruction of four enemy warships at unheard-of ranges by unknown means changed the paradigm of naval warfare.
As an odd appendix to the history of Iowas, the two esoteric Kearsage class ships and the two Illinois class battleships were already under construction. The Kearsage class was completed as designed, and USS Illinois was as well, both effectively obsolete before they were completed. Alabama was modified on the ways to replace the twin 8" guns with single 13" guns. None of the four were entirely satisfactory, and Maine was a clean sheet of paper design--but her specs are a tale for another day.
USS Iowa 1895, American Semi-dreadnought laid down 1895 (Engine 1905)
Displacement:
12,699 t light; 13,385 t standard; 13,980 t normal; 14,455 t full load
Dimensions: Length overall / water x beam x draught
391.00 ft / 390.00 ft x 74.00 ft x 24.50 ft (normal load)
119.18 m / 118.87 m x 22.56 m x 7.47 m
Armament:
6 - 12.00" / 305 mm guns (3x2 guns), 864.00lbs / 391.90kg shells, 1895 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority aft, 1 raised mount aft - superfiring
6 - 8.00" / 203 mm guns (3x2 guns), 256.00lbs / 116.12kg shells, 1895 Model
Breech loading guns in turrets (on barbettes)
on side ends, majority forward, all raised mounts - superfiring
10 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1895 Model
Breech loading guns in casemate mounts
on side, evenly spread
8 guns in hull casemates - Limited use in all but light seas
Weight of broadside 7,040 lbs / 3,193 kg
Shells per gun, main battery: 100
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 13.0" / 330 mm 253.50 ft / 77.27 m 12.00 ft / 3.66 m
Ends: 4.00" / 102 mm 136.48 ft / 41.60 m 12.00 ft / 3.66 m
Upper: 4.00" / 102 mm 253.50 ft / 77.27 m 8.00 ft / 2.44 m
Main Belt covers 100 % of normal length
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 17.0" / 432 mm 5.00" / 127 mm 12.5" / 318 mm
2nd: 6.00" / 152 mm 3.00" / 76 mm 9.00" / 229 mm
- Armour deck: 2.10" / 53 mm, Conning tower: 10.00" / 254 mm
Machinery:
Oil fired boilers, complex reciprocating steam engines,
Direct drive, 2 shafts, 11,496 ihp / 8,576 Kw = 17.00 kts
Range 5,000nm at 10.00 kts
Bunker at max displacement = 1,070 tons
Complement:
642 - 835
Cost:
£1.396 million / $5.583 million
Distribution of weights at normal displacement:
Armament: 880 tons, 6.3 %
Armour: 5,170 tons, 37.0 %
- Belts: 2,392 tons, 17.1 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 1,761 tons, 12.6 %
- Armour Deck: 892 tons, 6.4 %
- Conning Tower: 125 tons, 0.9 %
Machinery: 1,515 tons, 10.8 %
Hull, fittings & equipment: 5,125 tons, 36.7 %
Fuel, ammunition & stores: 1,280 tons, 9.2 %
Miscellaneous weights: 10 tons, 0.1 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
14,249 lbs / 6,463 Kg = 16.5 x 12.0 " / 305 mm shells or 2.1 torpedoes
Stability (Unstable if below 1.00): 1.02
Metacentric height 3.3 ft / 1.0 m
Roll period: 17.0 seconds
Steadiness - As gun platform (Average = 50 %): 52 %
- Recoil effect (Restricted arc if above 1.00): 0.73
Seaboat quality (Average = 1.00): 1.25
Hull form characteristics:
Hull has low quarterdeck
Block coefficient: 0.692
Length to Beam Ratio: 5.27 : 1
'Natural speed' for length: 19.75 kts
Power going to wave formation at top speed: 48 %
Trim (Max stability = 0, Max steadiness = 100): 42
Bow angle (Positive = bow angles forward): -10.00 degrees
Stern overhang: 1.00 ft / 0.30 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 20.87 ft / 6.36 m
- Forecastle (20 %): 15.00 ft / 4.57 m
- Mid (50 %): 14.00 ft / 4.27 m
- Quarterdeck (15 %): 10.00 ft / 3.05 m (14.00 ft / 4.27 m before break)
- Stern: 12.00 ft / 3.66 m
- Average freeboard: 14.37 ft / 4.38 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 82.7 %
- Above water (accommodation/working, high = better): 97.0 %
Waterplane Area: 22,967 Square feet or 2,134 Square metres
Displacement factor (Displacement / loading): 92 %
Structure weight / hull surface area: 163 lbs/sq ft or 796 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.93
- Longitudinal: 2.02
- Overall: 1.01
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Good seaboat, rides out heavy weather easily
I had to put a "1905" engine in to account for some of the changes in the timeline, as Vertical Triple Expansion engines are better than in OTL, and my version of Springsharp didn't allow them, or oil firing, with 1985 engines.