WesWorld

Atlantis has decided to purchase 4 trawlers and convert them to coastal forces depot ships. With the simple addition of a twin 40mm mount and light AA weapons.

Boa vista , Atlantean Coastal forces depot ship laid down 1926

Displacement:
579 t light; 596 t standard; 768 t normal; 906 t full load

Dimensions: Length overall / water x beam x draught
216.55 ft / 210.00 ft x 32.50 ft x 6.50 ft (normal load)
66.00 m / 64.01 m x 9.91 m x 1.98 m

Armament:
2 - 1.57" / 39.9 mm guns (1x2 guns), 1.93lbs / 0.88kg shells, 1926 Model
Anti-aircraft guns in deck mount
on centreline forward
2 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1926 Model
Anti-aircraft guns in deck mounts
on side, all amidships
2 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1926 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 4 lbs / 2 kg
Shells per gun, main battery: 500

Machinery:
Oil fired boilers, complex reciprocating steam engines,
Geared drive, 2 shafts, 1,854 ihp / 1,383 Kw = 16.00 kts
Range 7,000nm at 12.00 kts
Bunker at max displacement = 309 tons

Complement:
72 - 94

Cost:
£0.123 million / $0.493 million

Distribution of weights at normal displacement:
Armament: 1 tons, 0.1 %
Machinery: 107 tons, 13.9 %
Hull, fittings & equipment: 412 tons, 53.7 %
Fuel, ammunition & stores: 189 tons, 24.6 %
Miscellaneous weights: 60 tons, 7.8 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
2,539 lbs / 1,151 Kg = 1,312.0 x 1.6 " / 40 mm shells or 1.3 torpedoes
Stability (Unstable if below 1.00): 1.28
Metacentric height 1.4 ft / 0.4 m
Roll period: 11.4 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 1.88

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.606
Length to Beam Ratio: 6.46 : 1
'Natural speed' for length: 14.49 kts
Power going to wave formation at top speed: 52 %
Trim (Max stability = 0, Max steadiness = 100): 38
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): 55.5 %
- Above water (accommodation/working, high = better): 159.4 %
Waterplane Area: 5,020 Square feet or 466 Square metres
Displacement factor (Displacement / loading): 276 %
Structure weight / hull surface area: 53 lbs/sq ft or 257 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.26
- Longitudinal: 4.51
- Overall: 1.43
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
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

20 tons for 20 torpedos
20 tons for 20mm and 50 cal ammo for MTB's
10 tons for 40 Depth charges
10 tons for 40mm mount

I think they´re a bit small as depot ships....

Considering the british converted a small 623 ton trawler, the HMS Vulcan to a depot ship for MTB's and motorlaunches I'd disagree.

She was able to carry 15x18" torpedos and 58 depth charges.

How much will these cost? Just the thing for my Coastal Forces.

Well these particular ships are convertions so the cost is cheap.