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Ayachuco, Peruvian Training Ship laid down 1945

Displacement: 1,279 t light; 1,360 t standard; 1,698 t normal; 1,968 t full load

Dimensions: Length overall / water x beam x draught

319.18 ft / 311.68 ft x 36.09 ft x 11.48 ft (normal load) [97.29 m / 95.00 m x 11.00 m x 3.50 m]

Armament:

4 - 4.72" / 120 mm guns (2x2 guns), 52.72lbs / 23.92kg shells, 1945 Model Dual purpose guns in deck mounts with hoists on centreline ends, evenly spread
2 - 3.46" / 88.0 mm guns in single mounts, 20.79lbs / 9.43kg shells, 1945 Model Anti-aircraft guns in deck mounts on side, all amidships, all raised mounts - superfiring
4 - 1.46" / 37.0 mm guns (2x2 guns), 1.55lbs / 0.70kg shells, 1945 Model Anti-aircraft guns in deck mounts on centreline ends, evenly spread, all raised mounts
8 - 0.79" / 20.0 mm guns (4x2 guns), 0.24lbs / 0.11kg shells, 1945 Model Anti-aircraft guns in deck mounts on side, evenly spread, all raised mounts
Weight of broadside 261 lbs / 118 kg
Shells per gun, main battery: 300

Armour:

Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.59" / 15 mm 0.98" / 25 mm
2nd: 0.59" / 15 mm 0.59" / 15 mm -
3rd: 0.39" / 10 mm - -

Conning tower: 1.97" / 50 mm

Machinery:

Diesel Internal combustion motors, Geared drive, 2 shafts, 12,455 shp / 9,291 Kw = 25.50 kts
Range 6,000nm at 18.00 kts
Bunker at max displacement = 608 tons

Complement: 131 - 171

Cost: £0.803 million / $3.211 million

Distribution of weights at normal displacement:

Armament: 33 tons, 1.9 %
Armour: 19 tons, 1.1 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 13 tons, 0.8 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 6 tons, 0.4 %
Machinery: 315 tons, 18.5 %
Hull, fittings & equipment: 773 tons, 45.5 %
Fuel, ammunition & stores: 418 tons, 24.6 %
Miscellaneous weights: 140 tons, 8.2 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 3,015 lbs / 1,368 Kg = 57.2 x 4.7 " / 120 mm shells or 0.9 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 1.3 ft / 0.4 m
Roll period: 13.3 seconds
Steadiness - As gun platform (Average = 50 %): 74 %
- Recoil effect (Restricted arc if above 1.00): 0.44
Seaboat quality (Average = 1.00): 1.37

Hull form characteristics:

Hull has low quarterdeck and transom stern
Block coefficient: 0.460
Length to Beam Ratio: 8.64: 1
'Natural speed' for length: 20.49 kts
Power going to wave formation at top speed: 60 %
Trim (Max stability = 0, Max steadiness = 100): 54
Bow angle (Positive = bow angles forward): 18.00 degrees
Stern overhang: 1.64 ft / 0.50 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 18.04 ft / 5.50 m
- Forecastle (20 %): 16.40 ft / 5.00 m
- Mid (50 %): 14.76 ft / 4.50 m
- Quarterdeck (10 %): 6.56 ft / 2.00 m (14.76 ft / 4.50 m before break)
- Stern: 6.56 ft / 2.00 m
- Average freeboard: 14.65 ft / 4.47 m
Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 86.0 %
- Above water (accommodation/working, high = better): 165.2 %
Waterplane Area: 7,517 Square feet or 698 Square metres
Displacement factor (Displacement / loading): 162 %
Structure weight / hull surface area: 58 lbs/sq ft or 283 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.89
- Longitudinal: 3.30
- Overall: 1.01
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

Breakdown of Miscellaneous Weight

Provision for accommodation for cadets - 100 tons
Navigation, sea-search, and air-search radars - 40 tons

Training Ship Ayachuco – Laid down 1 January 1945, launched 30 June 1945, completed 6 November 1945