Imperial Roman Navy: 1920-1924 Designs

[snip]

Finalization of the LBS-21 class. Three ships planned, two beginning 1921 and the third in 1922.
--IRS Empress Amelia
--IRS Intrepidus
--IRS Consilium

LBS-21, Imperial Roman Republic Fast Battleship laid down 1921

Displacement:
   46,000 t light; 48,266 t standard; 51,006 t normal; 53,198 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (869.41 ft / 853.02 ft) x 104.99 ft x (31.17 / 32.30 ft)
   (265.00 m / 260.00 m) x 32.00 m  x (9.50 / 9.84 m)

Armament:
      8 - 16.14" / 410 mm 45.0 cal guns - 2,120.85lbs / 962.00kg shells, 110 per gun
     Breech loading guns in turret on barbette mounts, 1915 Model
     4 x 2-gun mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      20 - 5.51" / 140 mm 55.0 cal guns - 85.98lbs / 39.00kg shells, 200 per gun
     Quick firing guns in casemate mounts, 1909 Model
     20 x Single mounts on sides, evenly spread
      10 raised mounts
      4 - 3.94" / 100 mm 45.0 cal guns - 30.86lbs / 14.00kg shells, 200 per gun
     Anti-air guns in deck and hoist mounts, 1915 Model
     4 x Single mounts on sides, evenly spread
      4 raised mounts
      4 - 1.77" / 45.0 mm 50.0 cal guns - 3.31lbs / 1.50kg shells, 350 per gun
     Anti-air guns in deck mounts, 1911 Model
     4 x Single mounts on sides, evenly spread
      4 raised mounts
      10 - 0.26" / 6.5 mm 110.0 cal guns - 0.01lbs / 0.00kg shells, 15,000 per gun
     Machine guns in deck mounts, 1911 Model
     10 x Single mounts on sides, evenly spread
      10 raised mounts
      Weight of broadside 18,823 lbs / 8,538 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   13.4" / 340 mm   513.35 ft / 156.47 m   18.68 ft / 5.69 m
   Ends:   1.97" / 50 mm   339.67 ft / 103.53 m   13.12 ft / 4.00 m
     Main Belt covers 93 % of normal length
     Main Belt inclined 15.00 degrees (positive = in)

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      2.56" / 65 mm   513.35 ft / 156.47 m   34.45 ft / 10.50 m
   Beam between torpedo bulkheads 85.30 ft / 26.00 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   17.3" / 440 mm   7.09" / 180 mm      11.8" / 300 mm
   2nd:   3.94" / 100 mm   1.97" / 50 mm      3.94" / 100 mm
   3rd:   0.20" / 5 mm         -         0.98" / 25 mm
   4th:   0.20" / 5 mm         -               -

   - Armoured deck - multiple decks:
   For and Aft decks: 4.13" / 105 mm
   Forecastle: 1.38" / 35 mm  Quarter deck: 1.38" / 35 mm

   - Conning towers: Forward 13.39" / 340 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Electric motors, 4 shafts, 180,000 shp / 134,280 Kw = 30.46 kts
   Range 8,000nm at 14.00 kts
   Bunker at max displacement = 4,933 tons

Complement:
   1,696 - 2,206

Cost:
   £10.632 million / $42.527 million

Distribution of weights at normal displacement:
   Armament: 3,760 tons, 7.4 %
      - Guns: 3,760 tons, 7.4 %
   Armour: 15,838 tons, 31.1 %
      - Belts: 5,852 tons, 11.5 %
      - Torpedo bulkhead: 1,674 tons, 3.3 %
      - Armament: 3,468 tons, 6.8 %
      - Armour Deck: 4,447 tons, 8.7 %
      - Conning Tower: 397 tons, 0.8 %
   Machinery: 6,198 tons, 12.2 %
   Hull, fittings & equipment: 17,179 tons, 33.7 %
   Fuel, ammunition & stores: 5,006 tons, 9.8 %
   Miscellaneous weights: 3,025 tons, 5.9 %
      - Hull below water: 2,000 tons
      - Hull above water: 250 tons
      - On freeboard deck: 675 tons
      - Above deck: 100 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     70,452 lbs / 31,957 Kg = 33.5 x 16.1 " / 410 mm shells or 10.1 torpedoes
   Stability (Unstable if below 1.00): 1.19
   Metacentric height 7.4 ft / 2.2 m
   Roll period: 16.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.65
   Seaboat quality  (Average = 1.00): 1.10

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a round stern
   Block coefficient (normal/deep): 0.640 / 0.644
   Length to Beam Ratio: 8.13 : 1
   'Natural speed' for length: 29.21 kts
   Power going to wave formation at top speed: 51 %
   Trim (Max stability = 0, Max steadiness = 100): 45
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 5.64 ft / 1.72 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.82 %,  29.53 ft / 9.00 m,  27.07 ft / 8.25 m
      - Forward deck:   40.00 %,  27.07 ft / 8.25 m,  27.07 ft / 8.25 m
      - Aft deck:   20.18 %,  18.04 ft / 5.50 m,  18.04 ft / 5.50 m
      - Quarter deck:   19.00 %,  18.04 ft / 5.50 m,  18.04 ft / 5.50 m
      - Average freeboard:      23.74 ft / 7.24 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 92.6 %
      - Above water (accommodation/working, high = better): 183.5 %
   Waterplane Area: 67,950 Square feet or 6,313 Square metres
   Displacement factor (Displacement / loading): 108 %
   Structure weight / hull surface area: 201 lbs/sq ft or 981 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.99
      - Longitudinal: 1.02
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room

Misc Weight Distribution
-Below Water (2000t)
--1550t Electric Drives
--200t Additional Pumps
--200t Additional Damage Control Equipment
--50t Improved Food & Drink storage
-Above Water (250t)
--40t Improved Officer Accommodations
--40t Improved Crew Accommodations
--70t Additional Damage Control Equipment
--20t Enhanced Ventilation and Crew Comfort
--50t Long Range Wireless (2x)
--30t Construction Reserve
-On Deck (675t)
--375t 1918 Fire Control
--50t Reserved for Future Aviation Facilities (2x Recon Plane & 2x Catapults)
--50t Flag Facilities
--50t Enhanced Ventilation and Crew Comfort
--80t Power Assist for Caesemate guns
--10t Short Range Wireless
--35t Construction Reserve
-Above Deck (100t)
--15t Additional Optical Spotting Equipment
--70t Night Fighting Equipment
--15t Improved Signaling Equipment

[The Rock Doctor]

The belt is just a tad short but otherwise nice.

[snip]

What I get for last-second tinkering with Misc Weight. I'll fix and update.

[snip]

Since Mayan butts must be kicked, its time to catch up. The second to last ship of the 1921 program which I need to sim, the general fleet destroyer.

GFD-1921, Imperial Roman Republic Destroyer laid down 1921

Displacement:
   1,280 t light; 1,324 t standard; 1,542 t normal; 1,717 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (334.64 ft / 328.08 ft) x 29.53 ft x (10.66 / 11.59 ft)
   (102.00 m / 100.00 m) x 9.00 m  x (3.25 / 3.53 m)

Armament:
      4 - 3.94" / 100 mm 45.0 cal guns - 30.86lbs / 14.00kg shells, 175 per gun
     Breech loading guns in deck mounts, 1909 Model
     2 x Twin mounts on centreline ends, evenly spread
      4 - 0.26" / 6.5 mm 110.0 cal guns - 0.01lbs / 0.00kg shells, 10,000 per gun
     Breech loading guns in deck mounts, 1911 Model
     4 x Single mounts on sides, evenly spread
      4 raised mounts
      Weight of broadside 123 lbs / 56 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.39" / 10 mm   0.20" / 5 mm            -
   2nd:   0.20" / 5 mm         -               -

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 28,000 shp / 20,888 Kw = 30.37 kts
   Range 5,500nm at 14.00 kts
   Bunker at max displacement = 393 tons

Complement:
   122 - 159

Cost:
   £0.407 million / $1.629 million

Distribution of weights at normal displacement:
   Armament: 17 tons, 1.1 %
      - Guns: 17 tons, 1.1 %
   Armour: 11 tons, 0.7 %
      - Armament: 11 tons, 0.7 %
   Machinery: 780 tons, 50.6 %
   Hull, fittings & equipment: 374 tons, 24.2 %
   Fuel, ammunition & stores: 262 tons, 17.0 %
   Miscellaneous weights: 100 tons, 6.5 %
      - Hull below water: 25 tons
      - On freeboard deck: 75 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     470 lbs / 213 Kg = 15.4 x 3.9 " / 100 mm shells or 0.3 torpedoes
   Stability (Unstable if below 1.00): 1.27
   Metacentric height 1.2 ft / 0.4 m
   Roll period: 11.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.19
   Seaboat quality  (Average = 1.00): 1.15

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.522 / 0.535
   Length to Beam Ratio: 11.11 : 1
   'Natural speed' for length: 18.11 kts
   Power going to wave formation at top speed: 67 %
   Trim (Max stability = 0, Max steadiness = 100): 61
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 0.89 ft / 0.27 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  15.58 ft / 4.75 m,  13.94 ft / 4.25 m
      - Forward deck:   30.00 %,  13.94 ft / 4.25 m,  13.94 ft / 4.25 m
      - Aft deck:   35.00 %,  13.94 ft / 4.25 m,  13.94 ft / 4.25 m
      - Quarter deck:   15.00 %,  13.94 ft / 4.25 m,  13.94 ft / 4.25 m
      - Average freeboard:      14.07 ft / 4.29 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 169.2 %
      - Above water (accommodation/working, high = better): 143.5 %
   Waterplane Area: 6,589 Square feet or 612 Square metres
   Displacement factor (Displacement / loading): 74 %
   Structure weight / hull surface area: 28 lbs/sq ft or 136 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.85
      - Overall: 0.57
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

Misc Weight
--24t 6x530mm (1913) Torpedo Tubes (2x3 mounts centerline)
--2t 1912 FC
--25t LR Wireless
--3t Night Fighting Equipment
--10t Construction Reserve
--15t 1915 Hydrophone
--16t Depth Charges
--4t DC Throwers
--1t ASW Paravane

[snip]

And lastly, a Seaplane Carrier, two planned.

SOS-1921, Imperial Roman Republic Seaplane Operation Ship laid down 1921

Displacement:
   3,400 t light; 3,525 t standard; 4,013 t normal; 4,403 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (380.59 ft / 374.02 ft) x 45.93 ft x (16.40 / 17.60 ft)
   (116.00 m / 114.00 m) x 14.00 m  x (5.00 / 5.36 m)

Armament:
      4 - 5.51" / 140 mm 45.0 cal guns - 85.98lbs / 39.00kg shells, 200 per gun
     Quick firing guns in deck and hoist mounts, 1909 Model
     2 x Twin mounts on centreline, forward deck forward
      1 raised mount - superfiring
      1 - 3.94" / 100 mm 45.0 cal gun - 30.86lbs / 14.00kg shells, 350 per gun
     Anti-air gun in deck and hoist mount, 1915 Model
     1 x Single mount on centreline, forward deck aft
      1 raised mount
      4 - 0.26" / 6.5 mm 110.0 cal guns - 0.01lbs / 0.00kg shells, 15,000 per gun
     Machine guns in deck mounts, 1911 Model
     4 x Single mounts on sides, evenly spread
      4 raised mounts
      Weight of broadside 375 lbs / 170 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.57" / 40 mm   0.39" / 10 mm      1.57" / 40 mm
   2nd:   0.59" / 15 mm         -         0.98" / 25 mm
   3rd:   0.20" / 5 mm         -               -

   - Protected deck - single deck:
   For and Aft decks: 1.57" / 40 mm
   Forecastle: 1.57" / 40 mm  Quarter deck: 1.57" / 40 mm

   - Conning towers: Forward 2.95" / 75 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Electric motors, 2 shafts, 20,000 shp / 14,920 Kw = 24.43 kts
   Range 7,000nm at 14.00 kts
   Bunker at max displacement = 879 tons

Complement:
   251 - 327

Cost:
   £0.638 million / $2.551 million

Distribution of weights at normal displacement:
   Armament: 81 tons, 2.0 %
      - Guns: 81 tons, 2.0 %
   Armour: 365 tons, 9.1 %
      - Armament: 13 tons, 0.3 %
      - Armour Deck: 336 tons, 8.4 %
      - Conning Tower: 16 tons, 0.4 %
   Machinery: 689 tons, 17.2 %
   Hull, fittings & equipment: 1,331 tons, 33.2 %
   Fuel, ammunition & stores: 613 tons, 15.3 %
   Miscellaneous weights: 935 tons, 23.3 %
      - Hull below water: 225 tons
      - Hull above water: 225 tons
      - On freeboard deck: 465 tons
      - Above deck: 20 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     6,561 lbs / 2,976 Kg = 78.4 x 5.5 " / 140 mm shells or 1.4 torpedoes
   Stability (Unstable if below 1.00): 1.22
   Metacentric height 2.2 ft / 0.7 m
   Roll period: 12.9 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.23
   Seaboat quality  (Average = 1.00): 1.43

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a round stern
   Block coefficient (normal/deep): 0.498 / 0.510
   Length to Beam Ratio: 8.14 : 1
   'Natural speed' for length: 19.34 kts
   Power going to wave formation at top speed: 56 %
   Trim (Max stability = 0, Max steadiness = 100): 35
   Bow angle (Positive = bow angles forward): 8.00 degrees
   Stern overhang: 3.58 ft / 1.09 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  21.33 ft / 6.50 m,  21.33 ft / 6.50 m
      - Forward deck:   25.00 %,  21.33 ft / 6.50 m,  21.33 ft / 6.50 m
      - Aft deck:   40.00 %,  12.30 ft / 3.75 m,  12.30 ft / 3.75 m
      - Quarter deck:   15.00 %,  12.30 ft / 3.75 m,  12.30 ft / 3.75 m
      - Average freeboard:      16.36 ft / 4.99 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 77.1 %
      - Above water (accommodation/working, high = better): 136.8 %
   Waterplane Area: 11,428 Square feet or 1,062 Square metres
   Displacement factor (Displacement / loading): 133 %
   Structure weight / hull surface area: 71 lbs/sq ft or 344 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.91
      - Longitudinal: 2.34
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Good seaboat, rides out heavy weather easily

Misc Weight Distrubution
-Below Water (225t)
--175t Electric Drive
--25t Additional Damage Control Equipment
--25t AVGAS Safety Equipment
-Above Water (225t)
--100t Additional Support Equpment for Seaplanes and crew
--25t LR Wireless
--25t Improved Officer Accommodations
--25t Improved Crew Accommodations
--25t Additional Damage Control Equipment
--25t Enhanced Ventilation and Crew Comfort
-On Deck (465t)
--440t 4x Multi-Engine Seaplanes
--11t Fire Control
--10t SR Wireless
--4t Construction Reserve
-Above Deck (20t)
--15t Improved Signaling Equipment
--5t Night Fighting Equipment

[The Rock Doctor]

THE ROMAN BEAST AWAKENS

*Flees*

[Kaiser Kirk]

THE ROMAN BEAST AWAKENS

*Flees*

..it's a good thing.... I think...

[snip]

Finalization of the GPC-21 class, named the Messana Class. Given its intented use as a trade protection cruiser, the class draws its name from major trade ports past and present. Five ships planned.

--IRS Messana
--IRS Havre-de-Grâce
--IRS Montpelhièr
--IRS Dubris
--IRS Santa Rochelle

GPC-21A-3, Imperial Roman Republic Cruiser laid down 1921

Displacement:
   9,000 t light; 9,343 t standard; 10,581 t normal; 11,571 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (569.23 ft / 557.74 ft) x 63.98 ft x (21.33 / 22.80 ft)
   (173.50 m / 170.00 m) x 19.50 m  x (6.50 / 6.95 m)

Armament:
      8 - 7.09" / 180 mm 50.0 cal guns - 187.39lbs / 85.00kg shells, 150 per gun
     Breech loading guns in turret on barbette mounts, 1915 Model
     4 x 2-gun mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      2 - 3.94" / 100 mm 45.0 cal guns - 30.86lbs / 14.00kg shells, 175 per gun
     Anti-air guns in deck mounts, 1917 Model
     2 x Single mounts on sides, forward deck aft
      2 raised mounts
      6 - 0.26" / 6.5 mm 110.0 cal guns - 0.01lbs / 0.00kg shells, 15,000 per gun
     Machine guns in deck mounts, 1911 Model
     6 x Single mounts on sides, forward evenly spread
      6 raised mounts
      Weight of broadside 1,561 lbs / 708 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   3.15" / 80 mm   376.15 ft / 114.65 m   16.40 ft / 5.00 m
   Ends:   Unarmoured
     Main Belt covers 104 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   2.36" / 60 mm   1.18" / 30 mm      2.36" / 60 mm
   2nd:   0.20" / 5 mm         -               -
   3rd:   0.20" / 5 mm         -               -

   - Armoured deck - single deck:
   For and Aft decks: 1.38" / 35 mm
   Forecastle: 0.00" / 0 mm  Quarter deck: 1.38" / 35 mm

   - Conning towers: Forward 3.94" / 100 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 4 shafts, 80,000 shp / 59,680 Kw = 31.02 kts
   Range 10,000nm at 14.00 kts
   Bunker at max displacement = 2,228 tons

Complement:
   521 - 678

Cost:
   £2.192 million / $8.769 million

Distribution of weights at normal displacement:
   Armament: 484 tons, 4.6 %
      - Guns: 484 tons, 4.6 %
   Armour: 1,613 tons, 15.2 %
      - Belts: 802 tons, 7.6 %
      - Armament: 212 tons, 2.0 %
      - Armour Deck: 558 tons, 5.3 %
      - Conning Tower: 41 tons, 0.4 %
   Machinery: 2,755 tons, 26.0 %
   Hull, fittings & equipment: 3,773 tons, 35.7 %
   Fuel, ammunition & stores: 1,581 tons, 14.9 %
   Miscellaneous weights: 375 tons, 3.5 %
      - Hull below water: 80 tons
      - Hull above water: 100 tons
      - On freeboard deck: 170 tons
      - Above deck: 25 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     13,964 lbs / 6,334 Kg = 78.5 x 7.1 " / 180 mm shells or 1.6 torpedoes
   Stability (Unstable if below 1.00): 1.26
   Metacentric height 3.9 ft / 1.2 m
   Roll period: 13.6 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.34
   Seaboat quality  (Average = 1.00): 1.22

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.487 / 0.498
   Length to Beam Ratio: 8.72 : 1
   'Natural speed' for length: 23.62 kts
   Power going to wave formation at top speed: 58 %
   Trim (Max stability = 0, Max steadiness = 100): 41
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 1.64 ft / 0.50 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   18.00 %,  27.07 ft / 8.25 m,  25.43 ft / 7.75 m
      - Forward deck:   40.00 %,  25.43 ft / 7.75 m,  25.43 ft / 7.75 m
      - Aft deck:   27.44 %,  16.40 ft / 5.00 m,  16.40 ft / 5.00 m
      - Quarter deck:   14.56 %,  16.40 ft / 5.00 m,  16.40 ft / 5.00 m
      - Average freeboard:      21.76 ft / 6.63 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 100.7 %
      - Above water (accommodation/working, high = better): 186.8 %
   Waterplane Area: 23,489 Square feet or 2,182 Square metres
   Displacement factor (Displacement / loading): 117 %
   Structure weight / hull surface area: 106 lbs/sq ft or 518 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.94
      - Longitudinal: 1.80
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Good seaboat, rides out heavy weather easily

Misc Weight Distribution
-Below Water (80t)
--30t Additional Pumps
--30t Additional Damage Control Equipment
--10t Improved Food & Drink storage
-Above Water (100t)
--30t Additional Damage Control Equipment
--20t Enhanced Ventilation and Crew Comfort
--50t Long Range Wireless (2x)
-On Deck (170t)
--50t 1918 Fire Control
--50t Reserved for Future Aviation Facilities (2x Recon Plane & 2x Catapults)
--32t 8x530mm (1913) Torpedo Tubes (2x4 mounts Aft Deck Forward)
--25t Enhanced Ventilation and Crew Comfort
--10t Short Range Wireless
--3t Construction Reserve
-Above Deck (25t)
--10t Additional Optical Spotting Equipment
--10t Night Fighting Equipment
--5t Improved Signaling Equipment

[snip]

Finalization of the Heavy Fleet Destroyer 21 class. 10 planned, still working on names.

HFD-21, Imperial Roman Republic Heavy Destroyer laid down 1921

Displacement:
   2,000 t light; 2,074 t standard; 2,354 t normal; 2,578 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (405.20 ft / 393.70 ft) x 37.07 ft x (13.45 / 14.31 ft)
   (123.50 m / 120.00 m) x 11.30 m  x (4.10 / 4.36 m)

Armament:
      4 - 5.51" / 140 mm 40.0 cal guns - 85.98lbs / 39.00kg shells, 130 per gun
     Quick firing guns in deck mounts, 1917 Model
     4 x Single mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      1 - 3.94" / 100 mm 45.0 cal gun - 30.86lbs / 14.00kg shells, 100 per gun
     Anti-air gun in deck mount, 1915 Model
     1 x Single mount on centreline, aft deck forward
      1 raised mount
      4 - 0.26" / 6.5 mm 110.0 cal guns - 0.01lbs / 0.00kg shells, 10,000 per gun
     Machine guns in deck mounts, 1911 Model
     4 x Single mounts on sides, evenly spread
      4 raised mounts
      Weight of broadside 375 lbs / 170 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.39" / 10 mm   0.20" / 5 mm            -
   2nd:   0.20" / 5 mm         -               -

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 4 shafts, 45,987 shp / 34,307 Kw = 33.23 kts
   Range 5,500nm at 14.00 kts
   Bunker at max displacement = 505 tons

Complement:
   168 - 219

Cost:
   £0.680 million / $2.720 million

Distribution of weights at normal displacement:
   Armament: 55 tons, 2.3 %
      - Guns: 55 tons, 2.3 %
   Armour: 7 tons, 0.3 %
      - Armament: 7 tons, 0.3 %
   Machinery: 1,300 tons, 55.2 %
   Hull, fittings & equipment: 538 tons, 22.9 %
   Fuel, ammunition & stores: 354 tons, 15.0 %
   Miscellaneous weights: 100 tons, 4.2 %
      - Hull below water: 25 tons
      - On freeboard deck: 75 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     580 lbs / 263 Kg = 6.9 x 5.5 " / 140 mm shells or 0.3 torpedoes
   Stability (Unstable if below 1.00): 1.56
   Metacentric height 2.4 ft / 0.7 m
   Roll period: 10.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.19
   Seaboat quality  (Average = 1.00): 1.05

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.420 / 0.432
   Length to Beam Ratio: 10.62 : 1
   'Natural speed' for length: 19.84 kts
   Power going to wave formation at top speed: 64 %
   Trim (Max stability = 0, Max steadiness = 100): 48
   Bow angle (Positive = bow angles forward): 25.00 degrees
   Stern overhang: 1.94 ft / 0.59 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  20.51 ft / 6.25 m,  20.51 ft / 6.25 m
      - Forward deck:   15.00 %,  20.51 ft / 6.25 m,  20.51 ft / 6.25 m
      - Aft deck:   50.00 %,  11.48 ft / 3.50 m,  11.48 ft / 3.50 m
      - Quarter deck:   15.00 %,  11.48 ft / 3.50 m,  11.48 ft / 3.50 m
      - Average freeboard:      14.64 ft / 4.46 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 185.9 %
      - Above water (accommodation/working, high = better): 139.9 %
   Waterplane Area: 9,097 Square feet or 845 Square metres
   Displacement factor (Displacement / loading): 69 %
   Structure weight / hull surface area: 34 lbs/sq ft or 166 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.26
      - Overall: 0.55
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room

Misc Weight Distribution
--32t 6x530mm (1913) Torpedo Tubes (2x4 mounts centerline)
--6t 1918 FC
--25t LR Wireless
--15t 1915 Hydrophone
--12t Depth Charges
--3t DC Throwers
--3t Night Fighting Equipment
--5t Construction Reserve

[Jefgte]

Fast & powerful DD
;)

[Kaiser Kirk]

Interesting,
while years off from the Parthians knowing details,
they won't be keen on the 46000 ton behemoth.
They've been trying not to exceed 40,000 tons...

The 2000 DD is simply beyond their tech right now,
but the bigger hull gives more options.

The 9000 ton cruiser fits with both the Iberian effort
and the Japanese, and the 8000 ton Royal Neissan,
Seems to be collective concept that something less
than a BC can be used to fight cruisers.

The 25000 AC ... I'm not keen on.
Not sure what role it's supposed to do.
Hunting the Aztec Razees?
Seems a high investment for that.

There are a bunch of potential roles,
it would be a useful ship for,
just wondering if it's a bit hefty for them.

Compared to Parthia's recent AC,
It's ~1/3 larger, and has more guns than my Zemaka, but lighter shells
and less belt armor.

I presume it's meant for long range combat,
and some of that Misc wt is spotting aircraft.

Overall an interesting clutch of ships to consider matching up to.

[snip]

Ya, AC-22 is in a little bit of a strange spot. I need something which can gunfight one of the Aztec Razees, but I only have a 235mm and a 340mm gun to use. If Im going to go up to a 340, I'm building another Tullius Leofric, which may as well turn into a 4th Empress Amelia. That cant happen without a lack of other things. At the same time, while I could do a repeat Dux Antony, 8x235 is probly not enough to overwhelm a Razee quickly enough to not take cripling damage in return. In an ideal universe, I'd have an 280-305mm gun of my own and be able to bring heavier shell weight on about the same tonnage.

[snip]

A conversion under consideration for practical study of flying off decks. The old scout cruiser IRS Marathona, the rest of her class headed to the breakers, may have some usefulness here.

Marathona, Roman Imperial Republic Flying Off Deck Conversion (OG Engines) laid down 1908

Displacement:
   3,036 t light; 3,109 t standard; 3,292 t normal; 3,438 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (423.22 ft / 410.11 ft) x 42.65 ft x (13.94 / 14.39 ft)
   (129.00 m / 125.00 m) x 13.00 m  x (4.25 / 4.39 m)

Armament:
      2 - 3.94" / 100 mm 45.0 cal guns - 30.86lbs / 14.00kg shells, 200 per gun
     Quick firing guns in deck mount, 1909 Model
     1 x Twin mount on centreline, aft deck aft
      4 - 0.26" / 6.5 mm 110.0 cal guns - 0.01lbs / 0.00kg shells, 10,000 per gun
     Machine guns in deck mounts, 1911 Model
     4 x Single mounts on sides, aft evenly spread
      4 raised mounts
      Weight of broadside 62 lbs / 28 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.39" / 10 mm         -               -
   2nd:   0.20" / 5 mm         -               -

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 34,000 shp / 25,364 Kw = 29.21 kts
   Range 3,500nm at 10.00 kts
   Bunker at max displacement = 329 tons

Complement:
   216 - 282

Cost:
   £0.337 million / $1.349 million

Distribution of weights at normal displacement:
   Armament: 9 tons, 0.3 %
      - Guns: 9 tons, 0.3 %
   Armour: 4 tons, 0.1 %
      - Armament: 4 tons, 0.1 %
   Machinery: 1,628 tons, 49.5 %
   Hull, fittings & equipment: 1,015 tons, 30.8 %
   Fuel, ammunition & stores: 256 tons, 7.8 %
   Miscellaneous weights: 380 tons, 11.5 %
      - Hull below water: 160 tons
      - Hull above water: 160 tons
      - On freeboard deck: 45 tons
      - Above deck: 15 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,445 lbs / 655 Kg = 47.4 x 3.9 " / 100 mm shells or 0.4 torpedoes
   Stability (Unstable if below 1.00): 1.51
   Metacentric height 2.8 ft / 0.9 m
   Roll period: 10.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 53 %
         - Recoil effect (Restricted arc if above 1.00): 0.02
   Seaboat quality  (Average = 1.00): 1.09

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.472 / 0.478
   Length to Beam Ratio: 9.62 : 1
   'Natural speed' for length: 20.25 kts
   Power going to wave formation at top speed: 60 %
   Trim (Max stability = 0, Max steadiness = 100): 49
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 5.05 ft / 1.54 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  22.15 ft / 6.75 m,  22.15 ft / 6.75 m
      - Forward deck:   20.00 %,  22.15 ft / 6.75 m,  22.15 ft / 6.75 m
      - Aft deck:   45.00 %,  9.84 ft / 3.00 m,  9.84 ft / 3.00 m
      - Quarter deck:   15.00 %,  9.84 ft / 3.00 m,  9.84 ft / 3.00 m
      - Average freeboard:      14.76 ft / 4.50 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 171.3 %
      - Above water (accommodation/working, high = better): 136.7 %
   Waterplane Area: 11,371 Square feet or 1,056 Square metres
   Displacement factor (Displacement / loading): 86 %
   Structure weight / hull surface area: 55 lbs/sq ft or 266 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.86
      - Longitudinal: 1.34
      - Overall: 0.90
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room

Removed following items:
--4x140L50 guns
--2x75L50 guns
--All MISC items

Add following (Both)
--One twin 100mm gun mount
--Four single 6.5mm MG mounts
--Add 300t MISC Weight

Airgroup Calc
Waterplane: 1670.81
Max Airgroup: 25
Reduced for Flightdeck Cruiser status: 12

Max Weight 960
Adjusted for Conversion 1440
Avalible MISC Wieght : 320
Max Airgroup: 2 (320t)

Misc Weight Distribution
-Below Water (160t)
--160t Airgroup
-Above Water (160t)
--160t Airgroup
-On Deck (45t)
--30t Flying Off Deck Reinforcement
--1t 1912 Fire Control
--10t Short Range Wireless
--4t Construction Reserve
-Above Deck (15t)
--5t Additional Optical Spotting Equipment
--5t Flying Off Deck Managment Equipment
--5t Improved Signaling Equipment

The OOC intent here by choosing a short ship is that the flying off deck will take up enough of the length to make the jump to "If we just deck over the whole thing maybe we can land them to" something of practical experence.

[snip]

A slight diversion from the catchup, Rome's first Flattop. I'll have the 1922 Carrier tech done in 1923H2 so can start work on this guy in 1924H1 if things fit. IC the testing with the converted Marathona will have given enough umph to push a cruiser-sized purpose-built ship though. Something to start testing practical ideas with once completed, but actual construction and design experience to see where it lands come the 1926 program if additional carriers are built. The plan is for one.

Cardinal Richelieu, Imperial Roman Republic Aircraft Carrier laid down 1924

Displacement:
   11,000 t light; 11,324 t standard; 12,692 t normal; 13,786 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (623.36 ft / 606.96 ft) x 70.54 ft x (18.86 / 20.15 ft)
   (190.00 m / 185.00 m) x 21.50 m  x (5.75 / 6.14 m)

Armament:
      8 - 5.51" / 140 mm 40.0 cal guns - 85.98lbs / 39.00kg shells, 175 per gun
     Quick firing guns in deck and hoist mounts, 1917 Model
     8 x Single mounts on side ends, evenly spread
      2 - 3.94" / 100 mm 45.0 cal guns - 30.86lbs / 14.00kg shells, 100 per gun
     Anti-air guns in deck mounts, 1915 Model
     2 x Single mounts on sides, forward deck aft
      2 raised mounts
      Weight of broadside 750 lbs / 340 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   3.15" / 80 mm   394.52 ft / 120.25 m   16.40 ft / 5.00 m
   Ends:   Unarmoured
     Main Belt covers 100 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.39" / 10 mm   0.20" / 5 mm      0.39" / 10 mm
   2nd:   0.20" / 5 mm   0.20" / 5 mm            -

   - Armoured deck - single deck:
   For and Aft decks: 1.18" / 30 mm
   Forecastle: 0.00" / 0 mm  Quarter deck: 1.18" / 30 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 40,000 shp / 29,840 Kw = 25.26 kts
   Range 10,000nm at 14.00 kts
   Bunker at max displacement = 2,462 tons

Complement:
   597 - 777

Cost:
   £1.937 million / $7.746 million

Distribution of weights at normal displacement:
   Armament: 164 tons, 1.3 %
      - Guns: 164 tons, 1.3 %
   Armour: 1,468 tons, 11.6 %
      - Belts: 852 tons, 6.7 %
      - Armament: 16 tons, 0.1 %
      - Armour Deck: 600 tons, 4.7 %
   Machinery: 1,318 tons, 10.4 %
   Hull, fittings & equipment: 4,870 tons, 38.4 %
   Fuel, ammunition & stores: 1,692 tons, 13.3 %
   Miscellaneous weights: 3,180 tons, 25.1 %
      - Hull below water: 1,500 tons
      - Hull above water: 1,550 tons
      - On freeboard deck: 100 tons
      - Above deck: 30 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     32,692 lbs / 14,829 Kg = 390.5 x 5.5 " / 140 mm shells or 3.3 torpedoes
   Stability (Unstable if below 1.00): 1.26
   Metacentric height 4.5 ft / 1.4 m
   Roll period: 14.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 80 %
         - Recoil effect (Restricted arc if above 1.00): 0.16
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a round stern
   Block coefficient (normal/deep): 0.550 / 0.559
   Length to Beam Ratio: 8.60 : 1
   'Natural speed' for length: 24.64 kts
   Power going to wave formation at top speed: 46 %
   Trim (Max stability = 0, Max steadiness = 100): 40
   Bow angle (Positive = bow angles forward): 15.00 degrees
   Stern overhang: 8.50 ft / 2.59 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  29.53 ft / 9.00 m,  29.53 ft / 9.00 m
      - Forward deck:   30.00 %,  29.53 ft / 9.00 m,  29.53 ft / 9.00 m
      - Aft deck:   35.00 %,  29.53 ft / 9.00 m,  29.53 ft / 9.00 m
      - Quarter deck:   15.00 %,  29.53 ft / 9.00 m,  29.53 ft / 9.00 m
      - Average freeboard:      29.53 ft / 9.00 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 65.1 %
      - Above water (accommodation/working, high = better): 281.5 %
   Waterplane Area: 29,879 Square feet or 2,776 Square metres
   Displacement factor (Displacement / loading): 162 %
   Structure weight / hull surface area: 94 lbs/sq ft or 461 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.89
      - Longitudinal: 2.80
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Airgroup of 36 Planes (Pre 1933 tech)

Misc Weight Distribution
-Below Water (1500t)
--1440t Airgroup
--30t Additional Pumps
--30t Improved Damage Control Equipment
-Above Water (1550t)
--1440t Airgroup
--25t LR Wireless
--50t Improved Damage Control Equipment
--30t Enhanced Ventilation and Crew Comfort
--5t Construction Reserve
-On Deck (100t)
--17t 1918 Fire Control
--50t Enhanced Ventilation and Crew Comfort
--20t Improved Damage Control Equipment
--10t Short Range Wireless
--3t Construction Reserve
-Above Deck (30t)
--10t Additional Optical Spotting Equipment
--10t Night Fighting Equipment
--5t Improved Signaling Equipment
--5t Smoke Diversion Equipment