Vilnius Union Ships, 1911 - 1919

[The Rock Doctor]

5 Guys and the Mayans both have designs that are modestly better, although I don't know how many of either type exist.  If any, in the Mayan case.

NPC neighbours in Africa lack coastline.

All PC powers have better stuff in their inventory, of course, except for the Incans as I recall, but that's a strategic decision on their part.

[The Rock Doctor]

Suppose I should look at refurbing the Grenadjar class once more.  In theory, the AC offers more utility than the old BB - greater range, greater speed, reasonable primary/secondary armament.

But

-As with the PD refit from a page or two back, I'd add 8x1 100mm and 4x1 50mm to the armament.

-Install new electric turbine machinery for 26 knots.

-Add a fair bit of misc. weight for CIC, damage control, electric drive bits, etc.

-Switch the bunkerage over to all-oil, and with a greater radius.

A non-precise costing puts this refurbishment at $9.70 and 3.578 BP. 

The glaring problem with the refurb is that the freeboard won't permit a higher speed.  But the 45,000 kw turbine package going in takes up less than half the tonnage of the enormous 24,000 kw VTE drive coming out.  More than half of the original machinery space in the ships is now empty, leaving the hull strength at 1.49, and I have no particularly productive way to utilize it.  Add armor?  I've got to pay to replace the entire belt or deck.  Can't add more guns, really.  Raising the freeboard adds cost and also requires me to increased the height of the main belt.  Tis a conundrum.

Enter ship name, Enter country Enter ship type laid down 1902 (Engine 1919)

Displacement:
   14,402 t light; 14,993 t standard; 16,182 t normal; 17,133 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (492.13 ft / 492.13 ft) x 72.18 ft x (26.57 / 27.86 ft)
   (150.00 m / 150.00 m) x 22.00 m  x (8.10 / 8.49 m)

Armament:
      8 - 7.87" / 200 mm 45.0 cal guns - 246.19lbs / 111.67kg shells, 150 per gun
     Breech loading guns in turret on barbette mounts, 1902 Model
     2 x Twin mounts on centreline ends, evenly spread
     4 x Single mounts on sides, evenly spread
      12 - 5.12" / 130 mm 45.0 cal guns - 67.62lbs / 30.67kg shells, 150 per gun
     Breech loading guns in casemate mounts, 1902 Model
     12 x Single mounts on sides, evenly spread
      12 hull mounts in casemates- Limited use in heavy seas
      8 - 3.94" / 100 mm 45.0 cal guns - 30.77lbs / 13.96kg shells, 250 per gun
     Quick firing guns in deck mounts, 1902 Model
     8 x Single mounts on sides, evenly spread
      8 raised mounts
      4 - 1.97" / 50.0 mm 45.0 cal guns - 3.85lbs / 1.74kg shells, 150 per gun
     Anti-air guns in deck mounts, 1902 Model
     4 x Single mounts on sides, evenly spread
      4 double raised mounts
      6 - 0.39" / 10.0 mm 45.0 cal guns - 0.03lbs / 0.01kg shells, 4,000 per gun
     Breech loading guns in deck mounts, 1902 Model
     6 x Single mounts on sides, evenly spread
      6 double raised mounts
      Weight of broadside 3,043 lbs / 1,380 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   5.91" / 150 mm   360.89 ft / 110.00 m   11.81 ft / 3.60 m
   Ends:   1.97" / 50 mm   131.20 ft / 39.99 m   11.81 ft / 3.60 m
   Upper:   3.94" / 100 mm   319.88 ft / 97.50 m   11.81 ft / 3.60 m
     Main Belt covers 113 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   9.84" / 250 mm   5.12" / 130 mm      7.87" / 200 mm
   2nd:   1.97" / 50 mm   0.79" / 20 mm      3.94" / 100 mm
   3rd:   0.79" / 20 mm   0.39" / 10 mm            -
   4th:   0.79" / 20 mm   0.39" / 10 mm            -

   - Armoured deck - multiple decks:
   For and Aft decks: 2.36" / 60 mm
   Forecastle: 1.18" / 30 mm  Quarter deck: 2.36" / 60 mm

   - Conning towers: Forward 7.87" / 200 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Electric motors, 4 shafts, 60,321 shp / 45,000 Kw = 26.20 kts
   Range 15,000nm at 10.00 kts
   Bunker at max displacement = 2,140 tons

Complement:
   716 - 932

Cost:
   £1.040 million / $4.161 million

Distribution of weights at normal displacement:
   Armament: 687 tons, 4.2 %
      - Guns: 687 tons, 4.2 %
   Armour: 3,976 tons, 24.6 %
      - Belts: 1,815 tons, 11.2 %
      - Armament: 959 tons, 5.9 %
      - Armour Deck: 1,094 tons, 6.8 %
      - Conning Tower: 109 tons, 0.7 %
   Machinery: 2,142 tons, 13.2 %
   Hull, fittings & equipment: 6,261 tons, 38.7 %
   Fuel, ammunition & stores: 1,780 tons, 11.0 %
   Miscellaneous weights: 1,336 tons, 8.3 %
      - Hull below water: 692 tons
      - Hull above water: 144 tons
      - On freeboard deck: 200 tons
      - Above deck: 300 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     26,456 lbs / 12,000 Kg = 108.4 x 7.9 " / 200 mm shells or 3.2 torpedoes
   Stability (Unstable if below 1.00): 1.19
   Metacentric height 4.2 ft / 1.3 m
   Roll period: 14.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.30
   Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.600 / 0.606
   Length to Beam Ratio: 6.82 : 1
   'Natural speed' for length: 22.18 kts
   Power going to wave formation at top speed: 60 %
   Trim (Max stability = 0, Max steadiness = 100): 48
   Bow angle (Positive = bow angles forward): -10.00 degrees
   Stern overhang: -3.28 ft / -1.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
      - Forward deck:   30.00 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
      - Aft deck:   35.00 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
      - Quarter deck:   15.00 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
      - Average freeboard:      19.69 ft / 6.00 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 63.5 %
      - Above water (accommodation/working, high = better): 136.0 %
   Waterplane Area: 25,979 Square feet or 2,414 Square metres
   Displacement factor (Displacement / loading): 137 %
   Structure weight / hull surface area: 168 lbs/sq ft or 820 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 1.38
      - Longitudinal: 2.81
      - Overall: 1.49
   Excellent machinery, storage, compartmentation space
   Excellent accommodation and workspace room

Warning: Date too early for anti-air gun - 4th battery

[TacCovert4]

Well, using my own navy as a rubric.

This ship is enough to shy away the Weapon class 9000t cruisers, so it works as a convoy escort quite well.  My R-class Razees can beat them, with their 6 x 280mm armament, but the 250s can penetrate the Rs, so it's a fair fight except in speed.  Functionally, a convoy escorted by one of these would be sufficient to fend off an R class by itself.  The Sultan Ali class has the combination of armor and guns to make it a comfortable 'beat down', but that's a full up battlecruiser of well over 20,000t. 

[The Rock Doctor]

Well, using my own navy as a rubric.

This ship is enough to shy away the Weapon class 9000t cruisers, so it works as a convoy escort quite well.  My R-class Razees can beat them, with their 6 x 280mm armament, but the 250s can penetrate the Rs, so it's a fair fight except in speed.  Functionally, a convoy escorted by one of these would be sufficient to fend off an R class by itself.  The Sultan Ali class has the combination of armor and guns to make it a comfortable 'beat down', but that's a full up battlecruiser of well over 20,000t. 

Does this assessment change if you're confronting her with her original armament and modern fire control?

[Jefgte]

Electric motors, 4 shafts, 60,321 shp / 45,000 Kw = 26.20 kts

26.2kts is not really useful.

If you choose 25.6Kts, equal to Lucznik class speed, Grenadjar class & Lucznik class could work together.
The weight saved makes it possible to increase the height of the belt.

[The Rock Doctor]

That would save about $0.4 and 0.2 BP.  With that price I'd probably just take the extra 0.6 knots.

[TacCovert4]

Well, using my own navy as a rubric.

This ship is enough to shy away the Weapon class 9000t cruisers, so it works as a convoy escort quite well.  My R-class Razees can beat them, with their 6 x 280mm armament, but the 250s can penetrate the Rs, so it's a fair fight except in speed.  Functionally, a convoy escorted by one of these would be sufficient to fend off an R class by itself.  The Sultan Ali class has the combination of armor and guns to make it a comfortable 'beat down', but that's a full up battlecruiser of well over 20,000t. 

Does this assessment change if you're confronting her with her original armament and modern fire control?

I'd say that you run into some issues.  The guns themselves, yes.  But the fire control, no. 

If you have a 6 gun broadside of 250s, then you're going to be able to fire consistent half-salvos with some utility out to 25km.  That means you're just inside the 'bubble' of effective fire control for ladder shooting.  Once on target you'll be firing 6 gun full broadsides, which is inside the bubble for effective fire control.  250 is also going to be effective against most cruisers and even super cruisers all the way out to 20km plus.

Contrast that to your original armament.  But with modern FC

You'll be firing 2 gun half-salvos, but more likely 4 gun full salvos for long-range FC.  That means that at 25km (for consistency), you're only effectively targeting with 4 of the 8 available guns (due to the 200mm guns not having the spotting range), and firing at a slowed rate as you need full salvos to get inside the bubble for ladder shooting.  Your 280s are also not going to be substantially more effective per shell. 

Your 200mm guns get into the fight at 20km.  Now you're firing 8 gun full salvos, but you have to fire full salvos because you need different firing solutions for the different guns and you have 4 of each.  The 200mm guns are also marginal against cruisers and super-cruisers at 20km.  And now you have to stagger your fires as well because 200mm shell splashes and 280mm shell splashes may not be different enough.

When the range closes to under 14km or so, now you get the benefits of the 'hail of fire' from your 200mm guns.  But your ship has been on the back foot for a substantial amount of the engagement (in daylight, at night, not so much) and there's no guarantee that all your guns are functional at this point.

In conclusion, the Main-Intermediate-Secondary arrangement works at shorter ranges against peer pre-dreads, cruisers, and super cruisers/battlecruisers (but not the big fast-BB battlecruisers).  So at night, or in other situations, you're not at a disadvantage horrifically.  In daylight, any good crew with a ship mounting at least 6 guns greater than 10in caliber can take you on and you'll be severely disadvantaged.  While it might not be the most advisable for something like the R class with its 170mm of armor to take on this ship, it Can do it with an expectation of victory (and the R's are sort of lightly armored). 

I think that you'll see two net benefits from the 250mm conversion:

1)  A 3 gun half-salvo, and a 6 gun salvo.  Your FC will also be consistent rather than split 3 ways.

2)  You actually will gain in effective RoF.  Putting 250s into a 280mm space means there's plenty of working room, they're not cramped, so you're minimizing the effects of a twin turret.  While the 200s are faster firing than 250s, a single turret is the most spacious of all, so that'll probably even out for RoF. 

Plus, a side benefit is more tonnage for AA and anti DD/TB armaments.

[The Rock Doctor]

Tac suggested adding a fourth twin 400mm turret to the battlecruiser.  Kirk suggested a bit of weight on the bulges.  So I played around.

Depending on how my question about twin/2-gun turret research is answered, I may be stuck with twin mountings for the main battery for now - but I can put out 4-gun half-salvos anyway.

Enter ship name, Enter country Enter ship type laid down 1919

Displacement:
   38,487 t light; 40,384 t standard; 42,301 t normal; 43,835 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (818.81 ft / 803.81 ft) x 91.86 ft (Bulges 101.71 ft) x (30.18 / 31.18 ft)
   (249.57 m / 245.00 m) x 28.00 m (Bulges 31.00 m)  x (9.20 / 9.50 m)

Armament:
      8 - 15.75" / 400 mm 45.0 cal guns - 1,984.16lbs / 900.00kg shells, 100 per gun
     Breech loading guns in turret on barbette mounts, 1919 Model
     4 x Twin mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      16 - 5.12" / 130 mm 45.0 cal guns - 67.62lbs / 30.67kg shells, 250 per gun
     Quick firing guns in deck and hoist mounts, 1919 Model
     8 x Twin mounts on sides, evenly spread
      4 - 3.94" / 100 mm 45.0 cal guns - 30.78lbs / 13.96kg shells, 250 per gun
     Quick firing guns in deck mounts, 1919 Model
     4 x Single mounts on sides, evenly spread
      4 raised mounts
      4 - 1.97" / 50.0 mm 45.0 cal guns - 3.86lbs / 1.75kg shells, 150 per gun
     Anti-air guns in deck mounts, 1919 Model
     4 x Single mounts on sides, evenly spread
      4 raised mounts
      8 - 0.39" / 10.0 mm 45.0 cal guns - 0.02lbs / 0.01kg shells, 4,000 per gun
     Machine guns in deck mounts, 1919 Model
     8 x Single mounts on sides, evenly spread
      8 raised mounts
      Weight of broadside 17,094 lbs / 7,754 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   13.0" / 330 mm   522.47 ft / 159.25 m   16.11 ft / 4.91 m
   Ends:   Unarmoured
     Main Belt covers 100 % of normal length
     Main Belt inclined 12.00 degrees (positive = in)

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      1.97" / 50 mm   522.47 ft / 159.25 m   28.48 ft / 8.68 m
   Beam between torpedo bulkheads 82.02 ft / 25.00 m

   - Hull Bulges:
      0.59" / 15 mm   522.47 ft / 159.25 m   28.48 ft / 8.68 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   15.7" / 400 mm   7.87" / 200 mm      13.0" / 330 mm
   2nd:   1.97" / 50 mm   0.98" / 25 mm      3.94" / 100 mm
   3rd:   0.79" / 20 mm   0.20" / 5 mm            -
   4th:   0.39" / 10 mm   0.20" / 5 mm            -
   5th:   0.20" / 5 mm         -               -

   - Armoured deck - single deck:
   For and Aft decks: 3.94" / 100 mm
   Forecastle: 2.95" / 75 mm  Quarter deck: 3.94" / 100 mm

   - Conning towers: Forward 12.99" / 330 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 4 shafts, 152,815 shp / 114,000 Kw = 30.02 kts
   Range 12,000nm at 10.00 kts
   Bunker at max displacement = 3,451 tons

Complement:
   1,474 - 1,917

Cost:
   £8.040 million / $32.161 million

Distribution of weights at normal displacement:
   Armament: 2,829 tons, 6.7 %
      - Guns: 2,829 tons, 6.7 %
   Armour: 13,716 tons, 32.4 %
      - Belts: 4,582 tons, 10.8 %
      - Torpedo bulkhead: 1,084 tons, 2.6 %
      - Bulges: 325 tons, 0.8 %
      - Armament: 3,508 tons, 8.3 %
      - Armour Deck: 3,878 tons, 9.2 %
      - Conning Tower: 340 tons, 0.8 %
   Machinery: 5,427 tons, 12.8 %
   Hull, fittings & equipment: 15,616 tons, 36.9 %
   Fuel, ammunition & stores: 3,814 tons, 9.0 %
   Miscellaneous weights: 899 tons, 2.1 %
      - Hull below water: 6 tons
      - On freeboard deck: 453 tons
      - Above deck: 440 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     54,298 lbs / 24,629 Kg = 27.8 x 15.7 " / 400 mm shells or 7.8 torpedoes
   Stability (Unstable if below 1.00): 1.08
   Metacentric height 5.1 ft / 1.6 m
   Roll period: 18.9 seconds
   Steadiness   - As gun platform (Average = 50 %): 60 %
         - Recoil effect (Restricted arc if above 1.00): 0.83
   Seaboat quality  (Average = 1.00): 1.19

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.600 / 0.602
   Length to Beam Ratio: 7.90 : 1
   'Natural speed' for length: 28.35 kts
   Power going to wave formation at top speed: 51 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 15.00 degrees
   Stern overhang: 6.56 ft / 2.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  31.50 ft / 9.60 m,  24.28 ft / 7.40 m
      - Forward deck:   36.00 %,  24.28 ft / 7.40 m,  24.28 ft / 7.40 m
      - Aft deck:   29.00 %,  24.28 ft / 7.40 m,  24.28 ft / 7.40 m
      - Quarter deck:   15.00 %,  24.28 ft / 7.40 m,  24.28 ft / 7.40 m
      - Average freeboard:      24.86 ft / 7.58 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 85.1 %
      - Above water (accommodation/working, high = better): 169.4 %
   Waterplane Area: 54,006 Square feet or 5,017 Square metres
   Displacement factor (Displacement / loading): 104 %
   Structure weight / hull surface area: 201 lbs/sq ft or 983 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.97
      - Longitudinal: 1.20
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room

[Desertfox]

HMS Hood lives!

[The Rock Doctor]

Don't jinx her!

[The Rock Doctor]

I'm going to build her to these specs.  Won't change my 1/19 spreadsheet, but 2/19 onward will reflect the higher overall cost.

Enter ship name, Enter country Enter ship type laid down 1919

Displacement:
   38,939 t light; 40,864 t standard; 43,681 t normal; 45,934 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (818.81 ft / 803.81 ft) x 95.14 ft (Bulges 101.71 ft) x (31.17 / 32.58 ft)
   (249.57 m / 245.00 m) x 29.00 m (Bulges 31.00 m)  x (9.50 / 9.93 m)

Armament:
      8 - 15.75" / 400 mm 45.0 cal guns - 1,984.16lbs / 900.00kg shells, 100 per gun
     Breech loading guns in turret on barbette mounts, 1919 Model
     4 x Twin mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      16 - 5.12" / 130 mm 45.0 cal guns - 67.62lbs / 30.67kg shells, 250 per gun
     Quick firing guns in deck and hoist mounts, 1919 Model
     8 x Twin mounts on sides, evenly spread
      4 - 3.94" / 100 mm 45.0 cal guns - 30.78lbs / 13.96kg shells, 250 per gun
     Quick firing guns in deck mounts, 1919 Model
     4 x Single mounts on sides, evenly spread
      4 raised mounts
      4 - 1.97" / 50.0 mm 45.0 cal guns - 3.86lbs / 1.75kg shells, 150 per gun
     Anti-air guns in deck mounts, 1919 Model
     4 x Single mounts on sides, evenly spread
      4 raised mounts
      8 - 0.39" / 10.0 mm 45.0 cal guns - 0.02lbs / 0.01kg shells, 4,000 per gun
     Machine guns in deck mounts, 1919 Model
     8 x Single mounts on sides, evenly spread
      8 raised mounts
      Weight of broadside 17,094 lbs / 7,754 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   13.0" / 330 mm   522.47 ft / 159.25 m   16.11 ft / 4.91 m
   Ends:   Unarmoured
     Main Belt covers 100 % of normal length
     Main Belt inclined 12.00 degrees (positive = in)

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      1.97" / 50 mm   522.47 ft / 159.25 m   29.40 ft / 8.96 m
   Beam between torpedo bulkheads 82.02 ft / 25.00 m

   - Hull Bulges:
      0.59" / 15 mm   522.47 ft / 159.25 m   29.40 ft / 8.96 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   15.7" / 400 mm   7.87" / 200 mm      13.0" / 330 mm
   2nd:   1.97" / 50 mm   0.98" / 25 mm      3.94" / 100 mm
   3rd:   0.79" / 20 mm   0.20" / 5 mm            -
   4th:   0.39" / 10 mm   0.20" / 5 mm            -
   5th:   0.20" / 5 mm         -               -

   - Armoured deck - single deck:
   For and Aft decks: 3.94" / 100 mm
   Forecastle: 2.95" / 75 mm  Quarter deck: 3.94" / 100 mm

   - Conning towers: Forward 12.99" / 330 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 4 shafts, 155,495 shp / 116,000 Kw = 30.02 kts
   Range 18,000nm at 10.00 kts
   Bunker at max displacement = 5,071 tons

Complement:
   1,509 - 1,963

Cost:
   £8.104 million / $32.416 million

Distribution of weights at normal displacement:
   Armament: 2,829 tons, 6.5 %
      - Guns: 2,829 tons, 6.5 %
   Armour: 13,927 tons, 31.9 %
      - Belts: 4,602 tons, 10.5 %
      - Torpedo bulkhead: 1,119 tons, 2.6 %
      - Bulges: 336 tons, 0.8 %
      - Armament: 3,508 tons, 8.0 %
      - Armour Deck: 4,016 tons, 9.2 %
      - Conning Tower: 347 tons, 0.8 %
   Machinery: 5,522 tons, 12.6 %
   Hull, fittings & equipment: 15,819 tons, 36.2 %
   Fuel, ammunition & stores: 4,741 tons, 10.9 %
   Miscellaneous weights: 843 tons, 1.9 %
      - Hull below water: 4 tons
      - On freeboard deck: 399 tons
      - Above deck: 440 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     57,480 lbs / 26,072 Kg = 29.4 x 15.7 " / 400 mm shells or 8.2 torpedoes
   Stability (Unstable if below 1.00): 1.08
   Metacentric height 5.4 ft / 1.7 m
   Roll period: 18.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 60 %
         - Recoil effect (Restricted arc if above 1.00): 0.82
   Seaboat quality  (Average = 1.00): 1.19

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.600 / 0.604
   Length to Beam Ratio: 7.90 : 1
   'Natural speed' for length: 28.35 kts
   Power going to wave formation at top speed: 51 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 15.00 degrees
   Stern overhang: 6.56 ft / 2.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  31.50 ft / 9.60 m,  24.28 ft / 7.40 m
      - Forward deck:   36.00 %,  24.28 ft / 7.40 m,  24.28 ft / 7.40 m
      - Aft deck:   29.00 %,  24.28 ft / 7.40 m,  24.28 ft / 7.40 m
      - Quarter deck:   15.00 %,  24.28 ft / 7.40 m,  24.28 ft / 7.40 m
      - Average freeboard:      24.86 ft / 7.58 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 86.2 %
      - Above water (accommodation/working, high = better): 171.4 %
   Waterplane Area: 55,934 Square feet or 5,196 Square metres
   Displacement factor (Displacement / loading): 107 %
   Structure weight / hull surface area: 200 lbs/sq ft or 978 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.97
      - Longitudinal: 1.23
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room

8000@15 knots
4000@20 knots
2200@25 knots
1300@30 knots

[TacCovert4]

I approve.  Really a much better vessel than your previous 6 gun design.

[The Rock Doctor]

If we take the armament and protection of a protected cruiser, but give it the speed of a patrol vessel, do we end up with a useful trade protection ship?  Notionally, it's capable of commanding an escort group, hunting submarines, and giving anything smaller than an armored cruiser a fair stiff time of things.

If I forego the deck armor, I can shave 400 t off the ship.  Curiously, a single armored deck is less weight-intensive than a box over the magazines and machinery, so maybe I'm not understanding how the math works.

Slooper-dooper, Union trade protection unit, laid down 1919

Displacement:
   2,119 t light; 2,245 t standard; 2,499 t normal; 2,702 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (326.72 ft / 314.96 ft) x 39.37 ft x (14.11 / 14.97 ft)
   (99.58 m / 96.00 m) x 12.00 m  x (4.30 / 4.56 m)

Armament:
      8 - 5.12" / 130 mm 45.0 cal guns - 67.62lbs / 30.67kg shells, 250 per gun
     Quick firing guns in deck and hoist mounts, 1919 Model
     4 x Twin mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      2 - 1.97" / 50.0 mm 45.0 cal guns - 3.86lbs / 1.75kg shells, 250 per gun
     Anti-air guns in deck mounts, 1919 Model
     2 x Single mounts on sides amidships
      4 - 0.39" / 10.0 mm 45.0 cal guns - 0.02lbs / 0.01kg shells, 4,000 per gun
     Breech loading guns in deck mounts, 1919 Model
     4 x Single mounts on sides, evenly spread
      4 double raised mounts
      Weight of broadside 549 lbs / 249 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   2.95" / 75 mm   204.72 ft / 62.40 m   11.81 ft / 3.60 m
   Ends:   Unarmoured
     Main Belt covers 100 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.97" / 50 mm   0.79" / 20 mm      1.97" / 50 mm
   2nd:   0.79" / 20 mm   0.39" / 10 mm            -

   - Armoured deck - single deck:
   For and Aft decks: 0.98" / 25 mm
   Forecastle: 0.98" / 25 mm  Quarter deck: 0.98" / 25 mm

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

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 14,745 shp / 11,000 Kw = 23.89 kts
   Range 10,000nm at 10.00 kts
   Bunker at max displacement = 457 tons

Complement:
   176 - 229

Cost:
   £0.435 million / $1.740 million

Distribution of weights at normal displacement:
   Armament: 119 tons, 4.7 %
      - Guns: 119 tons, 4.7 %
   Armour: 495 tons, 19.8 %
      - Belts: 299 tons, 12.0 %
      - Armament: 33 tons, 1.3 %
      - Armour Deck: 152 tons, 6.1 %
      - Conning Tower: 12 tons, 0.5 %
   Machinery: 524 tons, 21.0 %
   Hull, fittings & equipment: 830 tons, 33.2 %
   Fuel, ammunition & stores: 381 tons, 15.2 %
   Miscellaneous weights: 151 tons, 6.0 %
      - Hull below water: 15 tons
      - On freeboard deck: 46 tons
      - Above deck: 90 tons

Fittings:
-12 t:  1912 fire control (AD)
-50 t:  Command facilities (AD)
-25 t:  L/R wireless (AD)
-12 t:  1x3 530mm torpedo carriage, if there's deck space
-10 t:  Night-fighting doodads
-10 t:  ASW munitions
-15 t:  Enhanced hydrophone package (BW)
-17 t:  Weight reserve

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     3,077 lbs / 1,396 Kg = 45.9 x 5.1 " / 130 mm shells or 0.9 torpedoes
   Stability (Unstable if below 1.00): 1.12
   Metacentric height 1.5 ft / 0.5 m
   Roll period: 13.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 60 %
         - Recoil effect (Restricted arc if above 1.00): 0.70
   Seaboat quality  (Average = 1.00): 1.28

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.500 / 0.510
   Length to Beam Ratio: 8.00 : 1
   'Natural speed' for length: 17.75 kts
   Power going to wave formation at top speed: 60 %
   Trim (Max stability = 0, Max steadiness = 100): 47
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 3.28 ft / 1.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  23.29 ft / 7.10 m,  18.37 ft / 5.60 m
      - Forward deck:   30.00 %,  18.37 ft / 5.60 m,  18.37 ft / 5.60 m
      - Aft deck:   35.00 %,  10.50 ft / 3.20 m,  10.50 ft / 3.20 m
      - Quarter deck:   15.00 %,  10.50 ft / 3.20 m,  10.50 ft / 3.20 m
      - Average freeboard:      14.83 ft / 4.52 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 89.7 %
      - Above water (accommodation/working, high = better): 126.4 %
   Waterplane Area: 8,262 Square feet or 768 Square metres
   Displacement factor (Displacement / loading): 114 %
   Structure weight / hull surface area: 61 lbs/sq ft or 298 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.79
      - Longitudinal: 2.63
      - Overall: 0.90
   Caution: Hull subject to strain in open-sea
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Good seaboat, rides out heavy weather easily

[Desertfox]

That's a very solid ship. I'd dump the armor and save the 400t.

[Kaiser Kirk]

From my point of view the real question is - what is the opposing vessel that's doing the raiding?

If it's Roman or Norse, well they are Wilno's neighbors and so the most likely belligerent.
As I recall, the Roman 140mm is comparable, but the Norse had 6".

Meanwhile, Byzantine runs 191mm, Parthia 180 & 165mm.
So the 130mm would at best hope for an inconvenient wound.

Now on a 2000t vessel, maybe that's worth it.
But things to consider.