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Laid down in 1943, the USS Tangier was the first of its class. This ship was designed to bolster the US's defenses in the Pacific.

USS Tangier laid down Q3/43.

Tangier, United States Seaplane Tender laid down 1943

Displacement:
6,350 t light; 6,572 t standard; 9,049 t normal; 11,030 t full load

Dimensions: Length overall / water x beam x draught
492.00 ft / 492.00 ft x 69.50 ft x 22.00 ft (normal load)
149.96 m / 149.96 m x 21.18 m x 6.71 m

Armament:
4 - 5.00" / 127 mm guns (2x2 guns), 55.17lbs / 25.02kg shells, 1943 Model
Dual purpose guns in deck mounts with hoists
on centreline, all forward
8 - 1.50" / 38.1 mm guns (4x2 guns), 1.69lbs / 0.77kg shells, 1943 Model
Anti-aircraft guns in deck mounts
on side, all amidships
4 - 0.75" / 19.1 mm guns in single mounts, 0.21lbs / 0.10kg shells, 1943 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 235 lbs / 107 kg
Shells per gun, main battery: 300

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 7,723 shp / 5,761 Kw = 17.00 kts
Range 40,000nm at 12.00 kts
Bunker at max displacement = 4,458 tons

Complement:
463 - 603

Cost:
£1.819 million / $7.277 million

Distribution of weights at normal displacement:
Armament: 33 tons, 0.4 %
Machinery: 199 tons, 2.2 %
Hull, fittings & equipment: 2,643 tons, 29.2 %
Fuel, ammunition & stores: 2,698 tons, 29.8 %
Miscellaneous weights: 3,475 tons, 38.4 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
18,488 lbs / 8,386 Kg = 295.8 x 5.0 " / 127 mm shells or 3.4 torpedoes
Stability (Unstable if below 1.00): 1.15
Metacentric height 3.8 ft / 1.1 m
Roll period: 15.1 seconds
Steadiness - As gun platform (Average = 50 %): 57 %
- Recoil effect (Restricted arc if above 1.00): 0.03
Seaboat quality (Average = 1.00): 1.73

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.421
Length to Beam Ratio: 7.08 : 1
'Natural speed' for length: 22.18 kts
Power going to wave formation at top speed: 30 %
Trim (Max stability = 0, Max steadiness = 100): 33
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: 24.40 ft / 7.44 m
- Forecastle (20 %): 18.00 ft / 5.49 m
- Mid (50 %): 15.53 ft / 4.73 m
- Quarterdeck (15 %): 12.00 ft / 3.66 m
- Stern: 15.53 ft / 4.73 m
- Average freeboard: 16.02 ft / 4.88 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 53.0 %
- Above water (accommodation/working, high = better): 133.0 %
Waterplane Area: 21,333 Square feet or 1,982 Square metres
Displacement factor (Displacement / loading): 219 %
Structure weight / hull surface area: 85 lbs/sq ft or 414 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.96
- Longitudinal: 1.48
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Excellent seaboat, comfortable, can fire her guns in the heaviest weather