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

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

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