As you´ve seen the RSAN is going to get some new toys.
I´ve carefully read whenever designs of small combatants were posted but I´d be curious to hear what you guys think about the one below. The decision is made, the ships are on the slips so feel free to fire away.
These ships are meant to act as escorts. Their speed should allow them to keep pace with the fast majority of all submarines known once those are surfaced. Second they can be used as patrol crafts (smuggle, fishing etc.) and thus are a modern version of my old and somewhat outdated sloops.
What do you think?
River-class, laid down 1925
Displacement:
597 t light; 628 t standard; 856 t normal; 1.039 t full load
Dimensions: Length overall / water x beam x draught
258,98 ft / 255,91 ft x 27,89 ft x 10,50 ft (normal load)
78,94 m / 78,00 m x 8,50 m x 3,20 m
Armament:
4 - 4,13" / 105 mm guns in single mounts, 35,32lbs / 16,02kg shells, 1925 Model
Breech loading guns in deck mounts
on centreline ends, evenly spread
8 - 1,57" / 40,0 mm guns (2x4 guns), 1,95lbs / 0,88kg shells, 1924 Model
Anti-aircraft guns in deck mounts
on side, all amidships
6 - 0,79" / 20,0 mm guns (3x2 guns), 0,24lbs / 0,11kg shells, 1923 Model
Anti-aircraft guns in deck mounts
on centreline, all aft
Weight of broadside 158 lbs / 72 kg
Shells per gun, main battery: 150
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 1,18" / 30 mm 121,88 ft / 37,15 m 7,87 ft / 2,40 m
Ends: Unarmoured
Main Belt covers 73% of normal length
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1,38" / 35 mm 0,79" / 20 mm -
3rd: 0,59" / 15 mm - -
4th: 0,39" / 10 mm - -
- Armour deck: 0,39" / 10 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 4.021 shp / 3.000 Kw = 20,29 kts
Range 7.200nm at 15,00 kts (Bunkerage = 410 tons)
Complement:
78 - 102
Cost:
£0,183 million / $0,731 million
Distribution of weights at normal displacement:
Armament: 20 tons, 2,3%
Armour: 95 tons, 11,1%
- Belts: 50 tons, 5,8%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 13 tons, 1,6%
- Armour Deck: 32 tons, 3,7%
- Conning Tower: 0 tons, 0,0%
Machinery: 131 tons, 15,2%
Hull, fittings & equipment: 316 tons, 36,9%
Fuel, ammunition & stores: 259 tons, 30,3%
Miscellaneous weights: 35 tons, 4,1%
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1.667 lbs / 756 Kg = 47,2 x 4,1 " / 105 mm shells or 0,9 torpedoes
Stability (Unstable if below 1.00): 1,39
Metacentric height 1,3 ft / 0,4 m
Roll period: 10,2 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0,19
Seaboat quality (Average = 1.00): 1,56
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0,400
Length to Beam Ratio: 9,18 : 1
'Natural speed' for length: 16,00 kts
Power going to wave formation at top speed: 50 %
Trim (Max stability = 0, Max steadiness = 100): 45
Bow angle (Positive = bow angles forward): 15,00 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%): 9,51 ft / 2,90 m
- Mid (50%): 9,51 ft / 2,90 m
- Quarterdeck (15%): 9,51 ft / 2,90 m
- Stern: 9,51 ft / 2,90 m
- Average freeboard: 9,67 ft / 2,95 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 72,6%
- Above water (accommodation/working, high = better): 102,1%
Waterplane Area: 4.393 Square feet or 408 Square metres
Displacement factor (Displacement / loading): 156%
Structure weight / hull surface area: 42 lbs/sq ft or 204 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,92
- Longitudinal: 2,03
- Overall: 1,00
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