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

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

As for the DL question, the Dianas can act as DLs, but also in a more traditional role as cruisers. And if you take a look at the RN organization as it´s right now you´ll see that some of the flotilllas are composed of 15 DDs and a leader, they´re way too big, my idea is to have more practical flotillas (1DL and 6-10 DDs), and for that I need more DLs, as I don´t want to use CLs as leaders if posible.

I know she depicts a Type B, anyway Type A is almost identical, the only difference is the aft superfiring mount (I was getting tired of messing around with the drawing and just didn´t wanted to draw another different mount, sometimes I´m lazy...)

If the 'A' type uses "

The SS data suggests something like a

Looking at the data for both types, it looks like you created the 'B' type first and then the 'A' type.

I assume that the 2pdrs on the 'A' type should be in two mounts of four rather than 6 mounts and that the 20mm guns should be in six mounts of 2 rather than 12 single ones.

Could be wrong. You know the designs better than me.

They only had 4TTs, and for a DD that´s not really too much, and they lacked an adequate AA defense. I´ve tried to design a ship type similar to the Tribal´s but avoiding those weaknesses.

*Thursday, July 19th 2018, 1:14pm*- Go to the top of the page

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