WesWorld

From what I have found the Peruvian Navy may be the proud owner of two depot ships - the Alpamayo and the "Fernando"? The name of the second vessel is unclear - but The Rock Doctor advises that the vessels in question were freighter conversions of 4,000 tons light, based upon the 1,000 tons allocated to each of them for cost of conversion. Alas, there is no record of a Springsharp for them. I have tried to sim a vessel as close to these characteristics and invite your comments before proceeding.

Alpamayo, Peruvian Depot Ship laid down 1943

Displacement: 3,956 t light; 4,128 t standard; 7,322 t normal; 9,877 t full load

Dimensions: Length overall / water x beam x draught

362.53 ft / 360.89 ft x 49.21 ft x 19.69 ft (normal load) [110.50 m / 110.00 m x 15.00 m x 6.00 m]

Armament:

2 - 4.13" / 105 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1943 Model Anti-aircraft guns in deck mounts on centerline ends, evenly spread
8 - 1.46" / 37.0 mm guns (4x2 guns), 1.55lbs / 0.70kg shells, 1943 Model Anti-aircraft guns in deck mounts on side, evenly spread
Weight of broadside 83 lbs / 38 kg
Shells per gun, main battery: 500

Machinery:

Diesel Internal combustion motors, Geared drive, 1 shaft, 3,743 shp / 2,792 Kw = 14.00 kts
Range 58,000nm at 12.00 kts
Bunker at max displacement = 5,750 tons

Complement: 395 - 514

Cost: £1.052 million / $4.207 million

Distribution of weights at normal displacement:

Armament: 10 tons, 0.1 %
Machinery: 97 tons, 1.3 %
Hull, fittings & equipment: 2,049 tons, 28.0 %
Fuel, ammunition & stores: 3,366 tons, 46.0 %
Miscellaneous weights: 1,800 tons, 24.6 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 22,416 lbs / 10,168 Kg = 634.6 x 4.1 " / 105 mm shells or 4.5 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 2.1 ft / 0.6 m
Roll period: 14.3 seconds
Steadiness - As gun platform (Average = 50 %): 86 %
- Recoil effect (Restricted arc if above 1.00): 0.02
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:

Hull has a flush deck
Block coefficient: 0.733
Length to Beam Ratio: 7.33: 1
'Natural speed' for length: 19.00 kts
Power going to wave formation at top speed: 36 %
Trim (Max stability = 0, Max steadiness = 100): 43
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: 1.64 ft / 0.50 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21.33 ft / 6.50 m
- Forecastle (20 %): 19.69 ft / 6.00 m
- Mid (40 %): 16.40 ft / 5.00 m
- Quarterdeck (20 %): 16.40 ft / 5.00 m
- Stern: 18.04 ft / 5.50 m
- Average freeboard: 17.68 ft / 5.39 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 33.8 %
- Above water (accommodation/working, high = better): 119.5 %
Waterplane Area: 14,625 Square feet or 1,359 Square meters
Displacement factor (Displacement / loading): 353 %
Structure weight / hull surface area: 86 lbs/sq ft or 419 Kg/sq meter
Hull strength (Relative):
- Cross-sectional: 1.20
- Longitudinal: 2.74
- Overall: 1.30
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Low stowed cargo simmed as bunkers.

True radius 8,000 nm on bunkers of 472 tons

Additional bunkers used to sim low-stowed cargo of 2,700 tons - Fuel oil 800 tons; Diesel oil 800 tons; Fresh water 500 tons; Dry stores 600 tons; total 2,700 tons

Breakdown of miscellaneous weight:

Cranes and heavy handling equipment: 200 tons
Accommodation for service personnel: 800 tons
Electrical shop: 200 tons
Metalsmithing shop: 200 tons
Engine maintenance shop: 200 tons
Boat maintenance shop: 200 tons

Seems okay.

Quoted from "Brockpaine"

Seems okay.

The light tonnage is close to but not quite the 4,000 - but designing a ship to a specific light tonnage is a bit difficult. To a specific normal tonnage is far easier.

Looks ok to me.