You are not logged in.

1

Monday, July 5th 2010, 8:52pm

Patrol Vessels

Herons Class
- Herons
- Patrula
- Patrulkugia
- Dargais
- Slavana

SC-1 Class
- SC-1 to SC-25

2

Monday, July 5th 2010, 8:52pm

Herons, Latvian Patrol Boat laid down 1932

Displacement:
393 t light; 408 t standard; 454 t normal; 491 t full load

Dimensions: Length overall / water x beam x draught
204.02 ft / 196.85 ft x 24.61 ft x 6.56 ft (normal load)
62.18 m / 60.00 m x 7.50 m x 2.00 m

Armament:
2 - 2.99" / 76.0 mm guns (1x2 guns), 15.43lbs / 7.00kg shells, 1932 Model
Quick firing guns in a deck mount with hoist
on centreline forward
2 - 1.46" / 37.0 mm guns in single mounts, 1.55lbs / 0.70kg shells, 1932 Model
Anti-aircraft guns in deck mounts with hoists
on centreline, all aft, all raised mounts - superfiring
4 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1932 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 34 lbs / 16 kg
Shells per gun, main battery: 300

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.20" / 5 mm -
2nd: 0.98" / 25 mm 0.20" / 5 mm -

- Conning tower: 1.97" / 50 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 1,992 shp / 1,486 Kw = 18.00 kts
Range 2,000nm at 15.00 kts
Bunker at max displacement = 82 tons

Complement:
48 - 63

Cost:
£0.114 million / $0.457 million

Distribution of weights at normal displacement:
Armament: 4 tons, 0.8 %
Armour: 5 tons, 1.1 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 2 tons, 0.5 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 3 tons, 0.6 %
Machinery: 59 tons, 12.9 %
Hull, fittings & equipment: 276 tons, 60.7 %
Fuel, ammunition & stores: 61 tons, 13.4 %
Miscellaneous weights: 50 tons, 11.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,261 lbs / 572 Kg = 94.2 x 3.0 " / 76 mm shells or 0.9 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 0.7 ft / 0.2 m
Roll period: 12.0 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.20
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.500
Length to Beam Ratio: 8.00 : 1
'Natural speed' for length: 14.03 kts
Power going to wave formation at top speed: 55 %
Trim (Max stability = 0, Max steadiness = 100): 25
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: 19.69 ft / 6.00 m
- Forecastle (20 %): 14.76 ft / 4.50 m
- Mid (50 %): 14.76 ft / 4.50 m (8.20 ft / 2.50 m aft of break)
- Quarterdeck (15 %): 8.20 ft / 2.50 m
- Stern: 8.20 ft / 2.50 m
- Average freeboard: 11.88 ft / 3.62 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 62.3 %
- Above water (accommodation/working, high = better): 143.8 %
Waterplane Area: 3,227 Square feet or 300 Square metres
Displacement factor (Displacement / loading): 224 %
Structure weight / hull surface area: 42 lbs/sq ft or 206 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.02
- Longitudinal: 7.38
- Overall: 1.25
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

3

Monday, July 5th 2010, 8:53pm

SC-1, Latvia Subchaser/Minesweeper laid down 1932

SC-1 to SC-25 OR SM to SM-25

Displacement:
100 t light; 106 t standard; 120 t normal; 131 t full load

Dimensions: Length overall / water x beam x draught
131.23 ft / 131.23 ft x 14.76 ft x 4.92 ft (normal load)
40.00 m / 40.00 m x 4.50 m x 1.50 m

Armament:
1 - 2.99" / 76.0 mm guns in single mounts, 15.43lbs / 7.00kg shells, 1932 Model
Quick firing gun in deck mount
on centreline forward
2 - 1.46" / 37.0 mm guns (1x2 guns), 1.55lbs / 0.70kg shells, 1932 Model
Anti-aircraft guns in deck mount
on centreline aft
2 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1932 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 19 lbs / 8 kg
Shells per gun, main battery: 300

Machinery:
Diesel Internal combustion motors,
Geared drive, 1 shaft, 782 shp / 584 Kw = 17.00 kts
Range 2,400nm at 12.00 kts
Bunker at max displacement = 25 tons

Complement:
17 - 23

Cost:
£0.039 million / $0.154 million

Distribution of weights at normal displacement:
Armament: 2 tons, 1.7 %
Machinery: 23 tons, 19.3 %
Hull, fittings & equipment: 60 tons, 49.9 %
Fuel, ammunition & stores: 20 tons, 16.6 %
Miscellaneous weights: 15 tons, 12.5 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
214 lbs / 97 Kg = 16.0 x 3.0 " / 76 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.12
Metacentric height 0.4 ft / 0.1 m
Roll period: 10.4 seconds
Steadiness - As gun platform (Average = 50 %): 54 %
- Recoil effect (Restricted arc if above 1.00): 0.25
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.440
Length to Beam Ratio: 8.89 : 1
'Natural speed' for length: 11.46 kts
Power going to wave formation at top speed: 59 %
Trim (Max stability = 0, Max steadiness = 100): 27
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 11.48 ft / 3.50 m
- Forecastle (20 %): 7.87 ft / 2.40 m
- Mid (50 %): 7.55 ft / 2.30 m
- Quarterdeck (15 %): 7.22 ft / 2.20 m
- Stern: 8.20 ft / 2.50 m
- Average freeboard: 7.92 ft / 2.41 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 91.8 %
- Above water (accommodation/working, high = better): 98.4 %
Waterplane Area: 1,166 Square feet or 108 Square metres
Displacement factor (Displacement / loading): 154 %
Structure weight / hull surface area: 21 lbs/sq ft or 101 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.80
- Longitudinal: 7.68
- Overall: 1.01
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is adequate
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Miscellaneous Weight Breakdown:

Minesweeper Configuration:

-15 tons paravanes and cables

Subchaser Configuration:
-5 tons hydrophones
-10 tons depth charges (30 depth charges)

SC-1 to SC-12 equipped as subchasers

SM-13 to SM-25 equipped as minesweepers