WesWorld

List of Tenders

Coastal forces Tender

Amazon,
Putamayo
Caqueta
Magdalena

Amazon, Colombian(Atlantean design) Coastal forces tender laid down 1945

Displacement:
689 t light; 718 t standard; 817 t normal; 896 t full load

Dimensions: Length overall / water x beam x draught
221.55 ft / 215.00 ft x 32.50 ft x 6.75 ft (normal load)
67.53 m / 65.53 m x 9.91 m x 2.06 m

Armament:
2 - 2.95" / 74.9 mm guns (1x2 guns), 12.84lbs / 5.82kg shells, 1945 Model
Automatic rapid fire guns in a deck mount with hoist
on centreline forward
4 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1945 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
4 - 0.50" / 12.7 mm guns (2x2 guns), 0.06lbs / 0.03kg shells, 1945 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 27 lbs / 12 kg
Shells per gun, main battery: 800

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 3,041 shp / 2,269 Kw = 18.00 kts
Range 6,000nm at 12.00 kts
Bunker at max displacement = 178 tons

Complement:
76 - 99

Cost:
£0.264 million / $1.056 million

Distribution of weights at normal displacement:
Armament: 4 tons, 0.5 %
Machinery: 77 tons, 9.4 %
Hull, fittings & equipment: 508 tons, 62.2 %
Fuel, ammunition & stores: 128 tons, 15.7 %
Miscellaneous weights: 100 tons, 12.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
2,647 lbs / 1,201 Kg = 206.3 x 3.0 " / 75 mm shells or 1.4 torpedoes
Stability (Unstable if below 1.00): 1.06
Metacentric height 1.0 ft / 0.3 m
Roll period: 13.4 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.07
Seaboat quality (Average = 1.00): 1.39

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.606
Length to Beam Ratio: 6.62 : 1
'Natural speed' for length: 14.66 kts
Power going to wave formation at top speed: 57 %
Trim (Max stability = 0, Max steadiness = 100): 51
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 18.00 ft / 5.49 m
- Forecastle (20 %): 12.00 ft / 3.66 m
- Mid (50 %): 12.00 ft / 3.66 m
- Quarterdeck (15 %): 12.00 ft / 3.66 m
- Stern: 12.00 ft / 3.66 m
- Average freeboard: 12.48 ft / 3.80 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 50.2 %
- Above water (accommodation/working, high = better): 154.6 %
Waterplane Area: 5,139 Square feet or 477 Square metres
Displacement factor (Displacement / loading): 286 %
Structure weight / hull surface area: 63 lbs/sq ft or 308 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.41
- Longitudinal: 5.08
- Overall: 1.60
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

Notes: based on the Boa Vista design these ships have improved capabilities over the preveous named class. Ships miscellaneous loadout may vary depending on area of deployment.
Misc. tonnage breakdown:
32 tons for 20x21" type 15 torpedos
15 tons for 40 type 5 depth charges
5 tons for 1 crane
2 tons for 8,000x20mm ammo
1 ton for 1,000x40mm ammo
1 ton for 30,300x 50 cal ammo
44 tons for fuel and supplies
Ships in class: Amazon, Putamayo, Caqueta, Magdalena