8 units of two different sub-classes will be laid down during 1925. The only difference between both is their main armament. While one of the classes has a somewhat classic 4,7in (3x2) /4in (1x2) AA layout, the other version introduces a new 4,5in DP gun.
The ships are named after ancient british kingdoms.
[SIZE=3]Type A[/SIZE]
HMS Powys
HMS Cerin
HMS Dyfed
HMS Dummonia
HMS Deira
Powys Class Tipe A, British Destroyer Leader laid down 1925
Displacement:
1.921 t light; 2.000 t standard; 2.231 t normal; 2.407 t full load
Dimensions: Length overall / water x beam x draught
359,19 ft / 348,00 ft x 34,00 ft x 15,00 ft (normal load)
109,48 m / 106,07 m x 10,36 m x 4,57 m
Armament:
6 - 4,70" / 119 mm guns (3x2 guns), 51,91lbs / 23,55kg shells, 1925 Model
Breech loading guns in deck mounts
on centreline ends, majority forward, 1 raised mount - superfiring
2 - 4,00" / 102 mm guns (1x2 guns), 32,00lbs / 14,51kg shells, 1925 Model
Anti-aircraft guns in deck mount
on centreline aft, all raised guns - superfiring
8 - 1,57" / 40,0 mm guns (2x4 guns), 1,95lbs / 0,88kg shells, 1925 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
12 - 0,79" / 20,0 mm guns (6x2 guns), 0,24lbs / 0,11kg shells, 1925 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 394 lbs / 179 kg
Shells per gun, main battery: 145
8 - 21,0" / 533,4 mm above water torpedoes
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1,00" / 25 mm - -
2nd: 1,00" / 25 mm - -
3rd: 0,50" / 13 mm - -
4th: 0,50" / 13 mm - -
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 53.852 shp / 40.173 Kw = 34,00 kts
Range 4.090nm at 15,00 kts (Bunkerage = 416 tons)
Complement:
162 - 211
Cost:
£0,941 million / $3,765 million
Distribution of weights at normal displacement:
Armament: 49 tons, 2,2 %
Armour: 16 tons, 0,7 %
- Belts: 0 tons, 0,0 %
- Torpedo bulkhead: 0 tons, 0,0 %
- Armament: 16 tons, 0,7 %
- Armour Deck: 0 tons, 0,0 %
- Conning Tower: 0 tons, 0,0 %
Machinery: 1.278 tons, 57,3 %
Hull, fittings & equipment: 557 tons, 25,0 %
Fuel, ammunition & stores: 310 tons, 13,9 %
Miscellaneous weights: 20 tons, 0,9 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
415 lbs / 188 Kg = 8,0 x 4,7 " / 119 mm shells or 0,2 torpedoes
Stability (Unstable if below 1.00): 1,46
Metacentric height 1,9 ft / 0,6 m
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0,24
Seaboat quality (Average = 1.00): 1,01
Hull form characteristics:
Hull has raised forecastle
Block coefficient: 0,440
Length to Beam Ratio: 10,24 : 1
'Natural speed' for length: 18,65 kts
Power going to wave formation at top speed: 69 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 25,00 degrees
Stern overhang: 0,00 ft / 0,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24,00 ft / 7,32 m
- Forecastle (30 %): 21,00 ft / 6,40 m (13,00 ft / 3,96 m aft of break)
- Mid (50 %): 13,00 ft / 3,96 m
- Quarterdeck (15 %): 13,00 ft / 3,96 m
- Stern: 13,00 ft / 3,96 m
- Average freeboard: 15,76 ft / 4,80 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 202,6 %
- Above water (accommodation/working, high = better): 58,1 %
Waterplane Area: 7.121 Square feet or 662 Square metres
Displacement factor (Displacement / loading): 57 %
Structure weight / hull surface area: 34 lbs/sq ft or 167 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,50
- Longitudinal: 2,36
- Overall: 0,58
Hull space for machinery, storage, compartmentation is extremely poor
Room for accommodation and workspaces is cramped
[SIZE=3]Type B[/SIZE]
(Same as above)
HMS Gwynedd
HMS Luitcoyt
HMS Rheged
Powys Class Type B, British Destroyer Leader laid down 1925
Displacement:
1.925 t light; 2.000 t standard; 2.231 t normal; 2.407 t full load
Dimensions: Length overall / water x beam x draught
359,19 ft / 348,00 ft x 34,00 ft x 15,00 ft (normal load)
109,48 m / 106,07 m x 10,36 m x 4,57 m
Armament:
8 - 4,50" / 114 mm guns (4x2 guns), 45,56lbs / 20,67kg shells, 1925 Model
Breech loading guns in deck mounts
on centreline ends, evenly spread, 2 raised mounts - superfiring
8 - 1,57" / 40,0 mm guns (2x4 guns), 1,95lbs / 0,88kg shells, 1925 Model
Anti-aircraft guns in deck mounts
on side, all amidships
12 - 0,79" / 20,0 mm guns (6x2 guns), 0,24lbs / 0,11kg shells, 1925 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 383 lbs / 174 kg
Shells per gun, main battery: 140
8 - 21,0" / 533,4 mm above water torpedoes
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1,00" / 25 mm - -
2nd: 0,50" / 13 mm - -
3rd: 0,50" / 13 mm - -
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 53.852 shp / 40.173 Kw = 34,00 kts
Range 4.090nm at 15,00 kts (Bunkerage = 416 tons)
Complement:
162 - 211
Cost:
£0,939 million / $3,754 million
Distribution of weights at normal displacement:
Armament: 48 tons, 2,1 %
Armour: 18 tons, 0,8 %
- Belts: 0 tons, 0,0 %
- Torpedo bulkhead: 0 tons, 0,0 %
- Armament: 18 tons, 0,8 %
- Armour Deck: 0 tons, 0,0 %
- Conning Tower: 0 tons, 0,0 %
Machinery: 1.280 tons, 57,4 %
Hull, fittings & equipment: 558 tons, 25,0 %
Fuel, ammunition & stores: 307 tons, 13,7 %
Miscellaneous weights: 20 tons, 0,9 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
416 lbs / 189 Kg = 9,1 x 4,5 " / 114 mm shells or 0,2 torpedoes
Stability (Unstable if below 1.00): 1,45
Metacentric height 1,9 ft / 0,6 m
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0,24
Seaboat quality (Average = 1.00): 1,01
Hull form characteristics:
Hull has raised forecastle
Block coefficient: 0,440
Length to Beam Ratio: 10,24 : 1
'Natural speed' for length: 18,65 kts
Power going to wave formation at top speed: 69 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 25,00 degrees
Stern overhang: 0,00 ft / 0,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24,00 ft / 7,32 m
- Forecastle (30 %): 21,00 ft / 6,40 m (13,00 ft / 3,96 m aft of break)
- Mid (50 %): 13,00 ft / 3,96 m
- Quarterdeck (15 %): 13,00 ft / 3,96 m
- Stern: 13,00 ft / 3,96 m
- Average freeboard: 15,76 ft / 4,80 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 202,3 %
- Above water (accommodation/working, high = better): 58,1 %
Waterplane Area: 7.121 Square feet or 662 Square metres
Displacement factor (Displacement / loading): 57 %
Structure weight / hull surface area: 34 lbs/sq ft or 168 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,50
- Longitudinal: 2,35
- Overall: 0,58
Hull space for machinery, storage, compartmentation is extremely poor
Room for accommodation and workspaces is cramped