Irish Frigate 1920

[maddox]

Not a bad corvette.  Maybe upping it to 500 ton (2 for 1 BP) and increase the speed to 27 kts.

[snip]

Cathryn Class, Irish Frigate laid down 1920 (Engine 1912)

Displacement:
   500 t light; 528 t standard; 596 t normal; 651 t full load

Dimensions: Length overall / water x beam x draught
   230.20 ft / 225.00 ft x 20.00 ft x 10.00 ft (normal load)
   70.17 m / 68.58 m x 6.10 m  x 3.05 m

Armament:
      3 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1920 Model
     Quick firing guns in deck mounts
     on centreline ends, majority aft, 1 raised mount aft
      6 - 0.98" / 25.0 mm guns (3x2 guns), 0.48lbs / 0.22kg shells, 1920 Model
     Machine guns in deck mounts
     on centreline, all amidships
      4 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1920 Model
     Machine guns in deck mounts
     on side ends, evenly spread
   Weight of broadside 99 lbs / 45 kg
   Shells per gun, main battery: 275
   3 - 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         -               -

   - Conning tower: 1.00" / 25 mm

Machinery:
   Coal and oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 11,119 shp / 8,294 Kw = 27.00 kts
   Range 3,500nm at 10.00 kts
   Bunker at max displacement = 123 tons (90% coal)

Complement:
   59 - 78

Cost:
   £0.158 million / $0.631 million

Distribution of weights at normal displacement:
   Armament: 12 tons, 2.1 %
   Armour: 8 tons, 1.4 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 7 tons, 1.2 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 2 tons, 0.3 %
   Machinery: 278 tons, 46.6 %
   Hull, fittings & equipment: 157 tons, 26.3 %
   Fuel, ammunition & stores: 96 tons, 16.1 %
   Miscellaneous weights: 45 tons, 7.6 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     153 lbs / 69 Kg = 4.8 x 4.0 " / 102 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.18
   Metacentric height 0.6 ft / 0.2 m
   Roll period: 10.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 51 %
         - Recoil effect (Restricted arc if above 1.00): 0.45
   Seaboat quality  (Average = 1.00): 1.14

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0.464
   Length to Beam Ratio: 11.25 : 1
   'Natural speed' for length: 15.00 kts
   Power going to wave formation at top speed: 68 %
   Trim (Max stability = 0, Max steadiness = 100): 45
   Bow angle (Positive = bow angles forward): 18.45 degrees
   Stern overhang: 0.20 ft / 0.06 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      15.00 ft / 4.57 m
      - Forecastle (10 %):   14.00 ft / 4.27 m
      - Mid (30 %):      14.00 ft / 4.27 m (9.00 ft / 2.74 m aft of break)
      - Quarterdeck (15 %):   9.00 ft / 2.74 m
      - Stern:      9.00 ft / 2.74 m
      - Average freeboard:   10.54 ft / 3.21 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 175.7 %
      - Above water (accommodation/working, high = better): 52.4 %
   Waterplane Area: 2,903 Square feet or 270 Square meters
   Displacement factor (Displacement / loading): 53 %
   Structure weight / hull surface area: 22 lbs/sq ft or 105 Kg/sq meter
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 3.10
      - Overall: 0.60
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is cramped

25 tons long range wireless
10 tons for mines (or depth charges once I have the tech)
6 tons 21inch torpedoes
4 tons construction reserve and expansion room (will most likely vary by individual ship as to use)
Trial speed: 29 knts

how does this look?

[snip]

For anyone interested, here is the drawing im basing this off of. Red dots are the gun mounts, Blue is the torp tubes, and Green is the mineracks.

[maddox]

Change the 102mm guns to 105's, the 21" torps to 24" and I buy the licence.

[snip]

Done

Cathryn Class (Export-France), Irish Frigate laid down 1920 (Engine 1912)

Displacement:
   499 t light; 528 t standard; 597 t normal; 651 t full load

Dimensions: Length overall / water x beam x draught
   230.20 ft / 225.00 ft x 20.00 ft x 10.00 ft (normal load)
   70.17 m / 68.58 m x 6.10 m  x 3.05 m

Armament:
      3 - 4.13" / 105 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1920 Model
     Quick firing guns in deck mounts
     on centreline ends, majority aft, 1 raised mount aft
      6 - 0.98" / 25.0 mm guns (3x2 guns), 0.48lbs / 0.22kg shells, 1920 Model
     Machine guns in deck mounts
     on centreline, all amidships
      4 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1920 Model
     Machine guns in deck mounts
     on side ends, evenly spread
   Weight of broadside 109 lbs / 49 kg
   Shells per gun, main battery: 275
   3 - 24.0" / 609.6 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         -               -

   - Conning tower: 1.00" / 25 mm

Machinery:
   Coal and oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 11,128 shp / 8,302 Kw = 27.00 kts
   Range 3,500nm at 10.00 kts
   Bunker at max displacement = 123 tons (90% coal)

Complement:
   59 - 78

Cost:
   £0.160 million / $0.639 million

Distribution of weights at normal displacement:
   Armament: 14 tons, 2.3 %
   Armour: 9 tons, 1.5 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 7 tons, 1.2 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 2 tons, 0.3 %
   Machinery: 276 tons, 46.3 %
   Hull, fittings & equipment: 159 tons, 26.7 %
   Fuel, ammunition & stores: 98 tons, 16.3 %
   Miscellaneous weights: 41 tons, 6.9 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     151 lbs / 68 Kg = 4.3 x 4.1 " / 105 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.14
   Metacentric height 0.6 ft / 0.2 m
   Roll period: 11.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 51 %
         - Recoil effect (Restricted arc if above 1.00): 0.51
   Seaboat quality  (Average = 1.00): 1.13

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0.464
   Length to Beam Ratio: 11.25 : 1
   'Natural speed' for length: 15.00 kts
   Power going to wave formation at top speed: 68 %
   Trim (Max stability = 0, Max steadiness = 100): 45
   Bow angle (Positive = bow angles forward): 18.45 degrees
   Stern overhang: 0.20 ft / 0.06 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      15.00 ft / 4.57 m
      - Forecastle (10 %):   14.00 ft / 4.27 m
      - Mid (30 %):      14.00 ft / 4.27 m (9.00 ft / 2.74 m aft of break)
      - Quarterdeck (15 %):   9.00 ft / 2.74 m
      - Stern:      9.00 ft / 2.74 m
      - Average freeboard:   10.54 ft / 3.21 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 176.0 %
      - Above water (accommodation/working, high = better): 38.8 %
   Waterplane Area: 2,904 Square feet or 270 Square metres
   Displacement factor (Displacement / loading): 53 %
   Structure weight / hull surface area: 22 lbs/sq ft or 107 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 3.15
      - Overall: 0.60
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is extremely poor

25 tons long range wireless
10 tons for mines (or depth charges once I have the tech)
6 tons 21inch torpedos
Trial speed: 29 knts

Or did you want the boilers pure oil?

[maddox]

Close, real close. The oil firing remark is valid. france is using oil firing everywere now, for ease of logistics. Romania and Egypt are the suppliers.

But you forgot 1 thing.
The increased weight of the 24" torps.

And now I can nitpick on details.

The details. 
France uses a 1914 37mm QF gun for AA purposes. Replace the 25mm and .5" machine guns  with 3 37mm's. 1 superfiring over the  forward 105, the 2 others  on the wings.

Gun armor ; 1" shield .5" other above deck for the main guns  , .5" shield for the 37mm's

Forget the long range wireless. These ships will be ment to operate together with the coast guard blimps. A short range one will do nicely.  Those 25 tons can go to ASW and/or more mines.

[snip]

Cathryn Class (Export-France), Irish Frigate laid down 1920 (Engine 1912)

Displacement:
   498 t light; 527 t standard; 590 t normal; 640 t full load

Dimensions: Length overall / water x beam x draught
   230.20 ft / 225.00 ft x 20.00 ft x 10.00 ft (normal load)
   70.17 m / 68.58 m x 6.10 m  x 3.05 m

Armament:
      3 - 4.13" / 105 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1920 Model
     Quick firing guns in deck mounts
     on centreline ends, majority aft, 1 raised mount aft
      1 - 1.46" / 37.0 mm guns in single mounts, 1.55lbs / 0.70kg shells, 1914 Model
     Quick firing gun in deck mount
     on centreline amidships, 1 raised gun
      2 - 1.46" / 37.0 mm guns in single mounts, 1.55lbs / 0.70kg shells, 1914 Model
     Quick firing guns in deck mounts
     on side, all forward
   Weight of broadside 111 lbs / 50 kg
   Shells per gun, main battery: 275
   3 - 24.0" / 609.6 mm above water torpedoes

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.00" / 25 mm   0.50" / 13 mm            -
   2nd:   0.50" / 13 mm         -               -

   - Conning tower: 1.00" / 25 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 11,018 shp / 8,219 Kw = 27.00 kts
   Range 3,500nm at 11.00 kts
   Bunker at max displacement = 113 tons

Complement:
   59 - 77

Cost:
   £0.156 million / $0.625 million

Distribution of weights at normal displacement:
   Armament: 14 tons, 2.3 %
   Armour: 8 tons, 1.4 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 7 tons, 1.1 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 2 tons, 0.3 %
   Machinery: 265 tons, 44.9 %
   Hull, fittings & equipment: 159 tons, 27.0 %
   Fuel, ammunition & stores: 92 tons, 15.6 %
   Miscellaneous weights: 52 tons, 8.8 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     151 lbs / 69 Kg = 4.3 x 4.1 " / 105 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.10
   Metacentric height 0.5 ft / 0.2 m
   Roll period: 11.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 51 %
         - Recoil effect (Restricted arc if above 1.00): 0.54
   Seaboat quality  (Average = 1.00): 1.13

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0.459
   Length to Beam Ratio: 11.25 : 1
   'Natural speed' for length: 15.00 kts
   Power going to wave formation at top speed: 67 %
   Trim (Max stability = 0, Max steadiness = 100): 45
   Bow angle (Positive = bow angles forward): 18.45 degrees
   Stern overhang: 0.20 ft / 0.06 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      15.00 ft / 4.57 m
      - Forecastle (10 %):   14.00 ft / 4.27 m
      - Mid (30 %):      14.00 ft / 4.27 m (9.00 ft / 2.74 m aft of break)
      - Quarterdeck (15 %):   9.00 ft / 2.74 m
      - Stern:      9.00 ft / 2.74 m
      - Average freeboard:   10.54 ft / 3.21 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 173.8 %
      - Above water (accommodation/working, high = better): 38.6 %
   Waterplane Area: 2,892 Square feet or 269 Square metres
   Displacement factor (Displacement / loading): 56 %
   Structure weight / hull surface area: 22 lbs/sq ft or 107 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 3.18
      - Overall: 0.60
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is extremely poor

9 tons 24inch torpedos
10 tons mines
8 tons depth charges
25 tons hydrophones
Trial speed: 29 knts

I think I got everything

[maddox]

Remove conning tower armor, add those 2 tons to the combined mine/DC/Hydrophone weight - 35 tons then.
And lets agree on a pricetag by diplomatic means on the licence.