WesWorld

Selendon, Peruvian Harbor Tug laid down 1949

Displacement: 436 t light; 446 t standard; 491 t normal; 527 t full load

Dimensions: Length overall / water x beam x draught

180.34 ft / 174.87 ft x 30.02 ft x 6.23 ft (normal load) [54.97 m / 53.30 m x 9.15 m x 1.90 m]

Armament:

2 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1949 Model Anti-aircraft guns in deck mounts on side, evenly spread
Weight of broadside 0 lbs / 0 kg
Shells per gun, main battery: 500

Machinery:

Diesel Internal combustion motors, Geared drive, 2 shafts, 647 shp / 482 Kw = 13.00 kts
Range 6,000nm at 10.00 kts
Bunker at max displacement = 81 tons

Complement: 51 - 67

Cost: £0.134 million / $0.535 million

Distribution of weights at normal displacement:

Armament: 0 tons, 0.0 %
Machinery: 16 tons, 3.2 %
Hull, fittings & equipment: 340 tons, 69.3 %
Fuel, ammunition & stores: 55 tons, 11.2 %
Miscellaneous weights: 80 tons, 16.3 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 3,723 lbs / 1,689 Kg = 15,250.8 x 0.8 " / 20 mm shells or 2.5 torpedoes
Stability (Unstable if below 1.00): 1.15
Metacentric height 1.1 ft / 0.3 m
Roll period: 12.2 seconds
Steadiness - As gun platform (Average = 50 %): 68 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:

Hull has low quarterdeck
Block coefficient: 0.525
Length to Beam Ratio: 5.83: 1
'Natural speed' for length: 13.22 kts
Power going to wave formation at top speed: 45 %
Trim (Max stability = 0, Max steadiness = 100): 34
Bow angle (Positive = bow angles forward): 12.00 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 (15 %): 18.04 ft / 5.50 m
- Mid (25 %): 14.76 ft / 4.50 m
- Quarterdeck (60 %): 6.56 ft / 2.00 m (14.76 ft / 4.50 m before break)
- Stern: 6.56 ft / 2.00 m
- Average freeboard: 10.50 ft / 3.20 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 29.7 %
- Above water (accommodation/working, high = better): 206.1 %
Waterplane Area: 3,579 Square feet or 333 Square meters
Displacement factor (Displacement / loading): 439 %
Structure weight / hull surface area: 63 lbs/sq ft or 309 Kg/sq meter
Hull strength (Relative):
- Cross-sectional: 1.47
- Longitudinal: 5.73
- Overall: 1.68
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

Breakdown of Miscellaneous Weight

Two auxiliary diesel-electric generating sets - 20 tons each - total 40 tons
Provision for stowed towing cables and winch aft - 30 tons
Navigation and communications equipment - 10 tons

Peru, like all Andean countries, is vulnerable to earthquakes and the tsunamis that may accompany them. To provide a means of responding quickly to such disasters the Peruvian Navy proposed construction of a class of small vessels that can make use of small harbors in the immediate vicinity of an earthquake to provide immediate response to such disasters.

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Caloyeras, Peruvian Civil Support Ship laid down 1949

Displacement: 419 t light; 432 t standard; 686 t normal; 889 t full load

Dimensions: Length overall / water x beam x draught

150.22 ft / 144.36 ft x 24.61 ft x 9.02 ft (normal load) [45.79 m / 44.00 m x 7.50 m x 2.75 m]

Armament:

1 - 0.79" / 20.0 mm gun in single mounts, 0.24lbs / 0.11kg shells, 1949 Model Anti-aircraft gun in deck mount on centerline forward
4 - 0.31" / 7.9 mm guns (2x2 guns), 0.02lbs / 0.01kg shells, 1949 Model Machine guns in deck mounts on side, evenly spread, all raised mounts
Weight of broadside 0 lbs / 0 kg
Shells per gun, main battery: 300

Armor:

Gun armor: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: - 0.39" / 10 mm -

Machinery:

Diesel Internal combustion motors, Geared drive, 2 shafts, 2,160 shp / 1,612 Kw = 16.00 kts
Range 10,000nm at 14.00 kts
Bunker at max displacement = 456 tons

Complement: 66 - 87

Cost: £0.168 million / $0.672 million

Distribution of weights at normal displacement:

Armament: 0 tons, 0.0 %
Armor: 0 tons, 0.0 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 0 tons, 0.0 %
- Armor Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 52 tons, 7.6 %
Hull, fittings & equipment: 246 tons, 35.9 %
Fuel, ammunition & stores: 267 tons, 39.0 %
Miscellaneous weights: 120 tons, 17.5 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 2,132 lbs / 967 Kg = 8,732.3 x 0.8 " / 20 mm shells or 1.3 torpedoes
Stability (Unstable if below 1.00): 1.08
Metacentric height 0.7 ft / 0.2 m
Roll period: 12.3 seconds
Steadiness - As gun platform (Average = 50 %): 72 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:

Hull has raised quarterdeck
Block coefficient: 0.749
Length to Beam Ratio: 5.87: 1
'Natural speed' for length: 12.01 kts
Power going to wave formation at top speed: 69 %
Trim (Max stability = 0, Max steadiness = 100): 36
Bow angle (Positive = bow angles forward): 18.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 18.04 ft / 5.50 m
- Forecastle (20 %): 15.58 ft / 4.75 m
- Mid (50 %): 13.12 ft / 4.00 m
- Quarterdeck (15 %): 15.58 ft / 4.75 m (13.12 ft / 4.00 m before break)
- Stern: 15.58 ft / 4.75 m
- Average freeboard: 14.55 ft / 4.44 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 45.1 %
- Above water (accommodation/working, high = better): 117.4 %
Waterplane Area: 2,972 Square feet or 276 Square meters
Displacement factor (Displacement / loading): 305 %
Structure weight / hull surface area: 36 lbs/sq ft or 176 Kg/sq meter
Hull strength (Relative):
- Cross-sectional: 0.89
- Longitudinal: 17.77
- Overall: 1.20
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

Cargo simmed as bunkers - Actual radius 2,200 nm at 14 knots - 200 tons cargo.
Cargo represents 70 tons POL storage for distribution, 70 tons dry stores for distribution, 40 tons medical supplies for use or distribution, 20 tons fresh water in tanks with pumps

Breakdown of miscellaneous weight:

Accommodation for disaster response team - 30 tons
Expanded dispensary and medical facilities - 60 tons
Evaporators, generators and necessary shore connections - 30 tons