Columbiad Republic Fleet

[Carthaginian]

Hmmm... looking at your liner, the rules MIGHT need to be adjusted a bit- might.
Let me follow that IMMEDIATELY by saying I like her; she is as realistic as the rules can make her and she isn't overdone in any way... she seems very much in line with a mid-size trans-Atlantic liner of the early 1900's.

Your ship jives nicely with the size and passenger capacity of the earlier (comparatively) Deutschland, and also in speed. The problem is that said ship had the nickname 'The Cocktail Shaker' because her massively over-sized engines caused the entire ship to vibrate at cruise speed!
A more adequate comparison might be the R.M.S. Lusitania, which- on 1/3 again the displacement- was able to carry the same bunker and relative engine power, but 411 more passengers. After all, Deutschland had her steerage passengers in dormitories while R.M.S. Lusitania gave them (crowded) 'staterooms.'

We might have to tweak the liner rules a touch- my primary concern lies in allowing too much 'passenger weight' to be placed deep in the hull. While I realize that such weight represents food, water, and other sundry necessities that don't require portholes... well, we aren't really taking those into great account in the liner figures. Well, that or we're possibly not taking the furniture, carpet, wood paneling, etc into enough account.

Might actually start a poll on this one, guys... give me a few nights (our census is still low and I might wind up with yet another unpaid day off) to run some numbers on real liners. I'll try to come up with something- either by limiting 'low weight,' increasing per-passenger weight, or adding another class of passenger.

[KWorld]

High speed reciprocating engines ARE a problem for a smooth cruise, but the 1905 design seemed too early to switch over to turbines, given that historically the switch took place somewhat later (RMS Titanic, for instance, had both triple-expansion engines and a turbine).

A quick check says that, AT LEAST ON THIS DESIGN, changing the rules to put passengers above the waterline has no real effect:

Unk-Liner 11, Unknown Unk-Liner laid down 1911

Displacement:
   19,941 t light; 20,421 t standard; 24,036 t normal; 26,928 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (693.89 ft / 688.98 ft) x 82.02 ft x (27.07 / 29.63 ft)
   (211.50 m / 210.00 m) x 25.00 m  x (8.25 / 9.03 m)

Machinery:
   Coal fired boilers, steam turbines,
   Direct drive, 2 shafts, 54,390 shp / 40,575 Kw = 25.00 kts
   Range 3,000nm at 22.00 kts
   Bunker at max displacement = 6,506 tons (100% coal)

Complement:
   964 - 1,254

Cost:
   £1.038 million / $4.151 million

Distribution of weights at normal displacement:
   Armament: 0 tons, 0.0 %
   Machinery: 2,428 tons, 10.1 %
   Hull, fittings & equipment: 6,113 tons, 25.4 %
   Fuel, ammunition & stores: 4,095 tons, 17.0 %
   Miscellaneous weights: 11,400 tons, 47.4 %
      - Hull below water: 300 tons
      - Hull above water: 5,000 tons
      - On freeboard deck: 4,100 tons
      - Above deck: 2,000 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     39,491 lbs / 17,913 Kg = 383.5 x 6 " / 152 mm shells or 4.3 torpedoes
   Stability (Unstable if below 1.00): 1.00
   Metacentric height 3.7 ft / 1.1 m
   Roll period: 17.9 seconds
   Steadiness   - As gun platform (Average = 50 %): 81 %
         - Recoil effect (Restricted arc if above 1.00): 0.00
   Seaboat quality  (Average = 1.00): 1.63

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.550 / 0.563
   Length to Beam Ratio: 8.40 : 1
   'Natural speed' for length: 26.25 kts
   Power going to wave formation at top speed: 43 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 10.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  27.89 ft / 8.50 m,  22.97 ft / 7.00 m
      - Forward deck:   30.00 %,  22.97 ft / 7.00 m,  18.04 ft / 5.50 m
      - Aft deck:   35.00 %,  18.04 ft / 5.50 m,  18.04 ft / 5.50 m
      - Quarter deck:   15.00 %,  18.04 ft / 5.50 m,  18.04 ft / 5.50 m
      - Average freeboard:      20.16 ft / 6.15 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 57.8 %
      - Above water (accommodation/working, high = better): 149.3 %
   Waterplane Area: 39,438 Square feet or 3,664 Square metres
   Displacement factor (Displacement / loading): 148 %
   Structure weight / hull surface area: 105 lbs/sq ft or 514 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 1.00
      - Longitudinal: 1.02
      - 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, rides out heavy weather easily

Carries 200 first-class passengers, 400 second-class passengers, and 1200 third-class passengers.  Also carries 50 50-person lifeboats.

Cargo capacity is 300 tons.

[Carthaginian]

We're talking abstract, and there isn't a ruling on things (yet)... but my argument is logical, so follow me:

Your initial design says the weights are divided as follows:
   Miscellaneous weights: 11,400 tons, 47.4 %
      - Hull below water: 3,400 tons
      - Hull above water: 3,000 tons
      - On freeboard deck: 3,000 tons
      - Above deck: 2,000 tons

Your revised design has the weights divided as follows:
   Miscellaneous weights: 11,400 tons, 47.4 %
      - Hull below water: 300 tons
      - Hull above water: 5,000 tons
      - On freeboard deck: 4,100 tons
      - Above deck: 2,000 tons

Not to offend, but how will you manage to cram 2000 more tons of passengers into the same space in the hull, and 1000 more tons worth of passengers into the same space on the freeboard deck level?

The answer is you cannot. You would have to allot that weight above the deck.
Now, changing the distribution of your weights has lowered the stability of the ship from 83% to 81%... yet the majority of the weight is still relatively close to the water!

If you would be so kind, please do this for me to assist in the overall study- resim the ship with the passenger weight redistributed according to these layouts:
LAYOUT #1
50% above Freeboard - representing a Liner's extensive superstructure
10% on Freeboard deck - representing the limited area of the freeboard deck
40% Hull Above Waterline - representing the large hull capacity
LAYOUT #2
30% above Freeboard - representing a Liner's extensive superstructure
10% on Freeboard deck - representing the limited area of the freeboard deck
60% Hull Above Waterline - representing the large hull capacity

Since we are trying for simple, I don't want things to get out of hand- but we can't have 80,000 ton liners trying to cram 40,000 tons of passengers into hammocks on the freeboard deck.
Thanks for your help in this and in the troop weight situation!

[KWorld]

The how depends totally on details of design that SS doesn't force you to care about.  The original design had lots of cabins below the waterline, causing coal and other supplies that might normally be there to be moved higher up in the ship.  Moving the below-waterline passenger space upwards lets you put the majority of the coal bunkers down where the passenger space had been.

If you look closely at ocean liners, vs modern cruise ships, they don't have a high superstructure.  RMS Titanic, for instance, looks to have 1 deck above the freeboard deck (bridge atop that), Aquitania about the same, the much later Queen Mary appears to have 2, perhaps 3 passenger decks above the freeboard deck, same with Vaterland.  Take a look at this Cunard poster for Aquatania: http://en.wikipedia.org/wiki/File:Aquitaniaposter.PNG, the vast majority of the living spaces are below deck (though above the waterline).

Anyway: design to parameters #1 (NOTE: UNSTABLE!!!)

Unk-Liner 11, Unknown Unk-Liner laid down 1911

Displacement:
   19,941 t light; 20,421 t standard; 24,036 t normal; 26,928 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (693.89 ft / 688.98 ft) x 82.02 ft x (27.07 / 29.63 ft)
   (211.50 m / 210.00 m) x 25.00 m  x (8.25 / 9.03 m)

Machinery:
   Coal fired boilers, steam turbines,
   Direct drive, 2 shafts, 54,390 shp / 40,575 Kw = 25.00 kts
   Range 3,000nm at 22.00 kts
   Bunker at max displacement = 6,506 tons (100% coal)

Complement:
   964 - 1,254

Cost:
   £1.038 million / $4.151 million

Distribution of weights at normal displacement:
   Armament: 0 tons, 0.0 %
   Machinery: 2,428 tons, 10.1 %
   Hull, fittings & equipment: 6,113 tons, 25.4 %
   Fuel, ammunition & stores: 4,095 tons, 17.0 %
   Miscellaneous weights: 11,400 tons, 47.4 %
      - Hull below water: 300 tons
      - Hull above water: 4,400 tons
      - On freeboard deck: 1,100 tons
      - Above deck: 5,600 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     33,528 lbs / 15,208 Kg = 325.6 x 6 " / 152 mm shells or 3.5 torpedoes
   Stability (Unstable if below 1.00): 0.95
   Metacentric height 3.3 ft / 1.0 m
   Roll period: 18.9 seconds
   Steadiness   - As gun platform (Average = 50 %): 80 %
         - Recoil effect (Restricted arc if above 1.00): 0.00
   Seaboat quality  (Average = 1.00): 1.61

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.550 / 0.563
   Length to Beam Ratio: 8.40 : 1
   'Natural speed' for length: 26.25 kts
   Power going to wave formation at top speed: 43 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 10.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  27.89 ft / 8.50 m,  22.97 ft / 7.00 m
      - Forward deck:   30.00 %,  22.97 ft / 7.00 m,  18.04 ft / 5.50 m
      - Aft deck:   35.00 %,  18.04 ft / 5.50 m,  18.04 ft / 5.50 m
      - Quarter deck:   15.00 %,  18.04 ft / 5.50 m,  18.04 ft / 5.50 m
      - Average freeboard:      20.16 ft / 6.15 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 55.2 %
      - Above water (accommodation/working, high = better): 149.3 %
   Waterplane Area: 39,438 Square feet or 3,664 Square metres
   Displacement factor (Displacement / loading): 148 %
   Structure weight / hull surface area: 105 lbs/sq ft or 514 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 1.00
      - Longitudinal: 1.02
      - Overall: 1.00
   Caution: Poor stability - excessive risk of capsizing
   Excellent machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, rides out heavy weather easily

Carries 200 first-class passengers, 400 second-class passengers, and 1200 third-class passengers.  Also carries 50 50-person lifeboats.

Cargo capacity is 300 tons.


Design to parameters #2 (very poor stability: 1.01)

Unk-Liner 11, Unknown Unk-Liner laid down 1911

Displacement:
   19,941 t light; 20,421 t standard; 24,036 t normal; 26,928 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (693.89 ft / 688.98 ft) x 82.02 ft x (27.07 / 29.63 ft)
   (211.50 m / 210.00 m) x 25.00 m  x (8.25 / 9.03 m)

Machinery:
   Coal fired boilers, steam turbines,
   Direct drive, 2 shafts, 54,390 shp / 40,575 Kw = 25.00 kts
   Range 3,000nm at 22.00 kts
   Bunker at max displacement = 6,506 tons (100% coal)

Complement:
   964 - 1,254

Cost:
   £1.038 million / $4.151 million

Distribution of weights at normal displacement:
   Armament: 0 tons, 0.0 %
   Machinery: 2,428 tons, 10.1 %
   Hull, fittings & equipment: 6,213 tons, 25.8 %
   Fuel, ammunition & stores: 4,095 tons, 17.0 %
   Miscellaneous weights: 11,300 tons, 47.0 %
      - Hull below water: 300 tons
      - Hull above water: 6,600 tons
      - On freeboard deck: 1,100 tons
      - Above deck: 3,300 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     35,299 lbs / 16,012 Kg = 342.8 x 6 " / 152 mm shells or 3.7 torpedoes
   Stability (Unstable if below 1.00): 1.01
   Metacentric height 3.8 ft / 1.1 m
   Roll period: 17.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 81 %
         - Recoil effect (Restricted arc if above 1.00): 0.00
   Seaboat quality  (Average = 1.00): 1.63

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.550 / 0.563
   Length to Beam Ratio: 8.40 : 1
   'Natural speed' for length: 26.25 kts
   Power going to wave formation at top speed: 43 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 10.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  27.89 ft / 8.50 m,  22.97 ft / 7.00 m
      - Forward deck:   30.00 %,  22.97 ft / 7.00 m,  18.04 ft / 5.50 m
      - Aft deck:   35.00 %,  18.04 ft / 5.50 m,  18.04 ft / 5.50 m
      - Quarter deck:   15.00 %,  18.04 ft / 5.50 m,  18.04 ft / 5.50 m
      - Average freeboard:      20.16 ft / 6.15 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 64.9 %
      - Above water (accommodation/working, high = better): 149.3 %
   Waterplane Area: 39,438 Square feet or 3,664 Square metres
   Displacement factor (Displacement / loading): 149 %
   Structure weight / hull surface area: 107 lbs/sq ft or 523 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 1.02
      - Longitudinal: 1.03
      - Overall: 1.02
   Excellent machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, rides out heavy weather easily

Carries 200 first-class passengers, 400 second-class passengers, and 1200 third-class passengers.  Also carries 50 50-person lifeboats.

Cargo capacity is 300 tons.

[Carthaginian]

Your Sims represent the problems inherent in liner construction!

These ships have MASSIVE topweight!
They do rapidly become unstable.

R.M.S. Titanic had three decks above the main deck, and then a boat deck with additional superstructure atop these. Queen Mary has no less than 4 and possibly 5, and then the additional boat deck superstructure.
These are roughly consistent with the smaller cruiser ships- Carnival's 70,000t Fantasy class has 5 decks and possibly 6 on similar tonnage to the Queen Mary, and the Destiy has 6 decks without additional structures on the boat deck on 100,000 tons.
You must also remember that though there were a smaller number of rooms on the upper decks, they were more heavily furnished and possessed heavier fittings (Heavy = Expensive). This means that the rooms had more weight in them than might be apparent.

So, the smaller cruise ships and large liners are adequate in comparison... though even monsters like the Dream class Carnival Magic only have 6 decks above their main deck.

[snip]

Might I also note that the trim on these designs has been left at 50, so adjusting that could yield some improvement to the ships handling.

[KWorld]

I disagree: look here for Titanic's plans - http://www.titanic-plan.de/start_e.html - she has 2 decks above the main deck (the bridge doesn't count, and doesn't extend aft of her second funnel).  The same is true of the SS United States (see here: http://united-states-lines.org/Big%20U%20deck%20plans.htm) - again, 2 cabin decks above the main deck (there are a few cabins on the Sports deck but not many).  Don't look at modern cruise ships, they're designed totally differently from ocean liners (other than QM2, but she's so big she can get away with that pile of superstructure).

[KWorld]

Might I also note that the trim on these designs has been left at 50, so adjusting that could yield some improvement to the ships handling.

Trimming could help a bit, but stability and steadiness move in opposite directions: if you trim for stability, you lose steadiness (which if I remember correctly would be something your passengers would not thank you for).

[Carthaginian]

 First off, I will have to be at home to look at the pics, and I will. Second, modern cruise ships are becoming quite 'hollow,' with only a ring of cabins surrounding large open spaces two and even three decks high. The old liners were rather solidly built compared to this. I am starting to think that a 65%/10%/25% split might be about where we need things.

[KWorld]

If anything, you're going the wrong way (if you;re thinking 65% above the waterline).  Look at the picture for Aquatania I posted: most of the cabins and passenger spaces are above the waterline but below the main deck.


The designs I posted are flawed in a different way: they don't have ENOUGH freeboard.  I'm thinking liners should be designed to a seaworthiness of 2.0 minimum, to get the high-sided hulls these ships had, and to give room for all the accommodations and common spaces that were below the main deck.  Once that's done, if we require all 1st-3rd class accommodations be above the waterline, limit the weight on the main deck to 20-25% and weight above that to no more than double the weight on the main deck, IMO we should be good.

[Carthaginian]

NO!!!!! No, no, no, no! :) I meant 65/10/25 (hull above water/main deck/above deck)! That will put it more in line with your suggestion, but still require a portion of the weight to be high up. We might also require that lifeboat weight be above the main deck as well, since they generally were.

[KWorld]

OK, better.  Requiring the boat weight to be high is fine, but it's not going to be enough to matter at 2 tons per 50 people.  Also, keep in mind that while the fittings in the highest rooms are probably heavier than those in the cabins on the main deck, most period designs have a lot of promenade space on the upper decks, while the main deck accommodations stop closer (or at) the ships beam.  Ie, I still think you're over-estimating the amount of weight carried in the upper superstructure, and not allowing the carriage of weight lower down where it looks to have been.

I'll try re-simming with these ideas later today.

[KWorld]

Here's the design with 65% in the hull (above water), 15% on the freeboard deck, and 20% (plus the lifeboats) above the freeboard deck.  I'm leaving the trim at 50, for better comparisons with the previous designs.

Unk-Liner 11, Unknown Unk-Liner laid down 1911

Displacement:
   19,941 t light; 20,421 t standard; 24,036 t normal; 26,928 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (693.89 ft / 688.98 ft) x 82.02 ft x (27.07 / 29.63 ft)
   (211.50 m / 210.00 m) x 25.00 m  x (8.25 / 9.03 m)

Machinery:
   Coal fired boilers, steam turbines,
   Direct drive, 2 shafts, 54,390 shp / 40,575 Kw = 25.00 kts
   Range 3,000nm at 22.00 kts
   Bunker at max displacement = 6,506 tons (100% coal)

Complement:
   964 - 1,254

Cost:
   £1.038 million / $4.151 million

Distribution of weights at normal displacement:
   Armament: 0 tons, 0.0 %
   Machinery: 2,428 tons, 10.1 %
   Hull, fittings & equipment: 6,113 tons, 25.4 %
   Fuel, ammunition & stores: 4,095 tons, 17.0 %
   Miscellaneous weights: 11,400 tons, 47.4 %
      - Hull below water: 300 tons
      - Hull above water: 7,150 tons
      - On freeboard deck: 1,650 tons
      - Above deck: 2,300 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     34,347 lbs / 15,580 Kg = 333.5 x 6 " / 152 mm shells or 3.6 torpedoes
   Stability (Unstable if below 1.00): 1.03
   Metacentric height 3.9 ft / 1.2 m
   Roll period: 17.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 82 %
         - Recoil effect (Restricted arc if above 1.00): 0.00
   Seaboat quality  (Average = 1.00): 1.63

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.550 / 0.563
   Length to Beam Ratio: 8.40 : 1
   'Natural speed' for length: 26.25 kts
   Power going to wave formation at top speed: 43 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 10.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  27.89 ft / 8.50 m,  22.97 ft / 7.00 m
      - Forward deck:   30.00 %,  22.97 ft / 7.00 m,  18.04 ft / 5.50 m
      - Aft deck:   35.00 %,  18.04 ft / 5.50 m,  18.04 ft / 5.50 m
      - Quarter deck:   15.00 %,  18.04 ft / 5.50 m,  18.04 ft / 5.50 m
      - Average freeboard:      20.16 ft / 6.15 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 67.3 %
      - Above water (accommodation/working, high = better): 149.3 %
   Waterplane Area: 39,438 Square feet or 3,664 Square metres
   Displacement factor (Displacement / loading): 148 %
   Structure weight / hull surface area: 105 lbs/sq ft or 514 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 1.00
      - Longitudinal: 1.02
      - 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, rides out heavy weather easily

Carries 200 first-class passengers, 400 second-class passengers, and 1200 third-class passengers.  Also carries 50 50-person lifeboats.

Cargo capacity is 300 tons.

Here's the same design with 65% below the freeboard deck, 10% on the freeboard deck, and 25% (plus lifeboats) above the freeboard deck.

Unk-Liner 11, Unknown Unk-Liner laid down 1911

Displacement:
   19,941 t light; 20,421 t standard; 24,036 t normal; 26,928 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (693.89 ft / 688.98 ft) x 82.02 ft x (27.07 / 29.63 ft)
   (211.50 m / 210.00 m) x 25.00 m  x (8.25 / 9.03 m)

Machinery:
   Coal fired boilers, steam turbines,
   Direct drive, 2 shafts, 54,390 shp / 40,575 Kw = 25.00 kts
   Range 3,000nm at 22.00 kts
   Bunker at max displacement = 6,506 tons (100% coal)

Complement:
   964 - 1,254

Cost:
   £1.038 million / $4.151 million

Distribution of weights at normal displacement:
   Armament: 0 tons, 0.0 %
   Machinery: 2,428 tons, 10.1 %
   Hull, fittings & equipment: 6,113 tons, 25.4 %
   Fuel, ammunition & stores: 4,095 tons, 17.0 %
   Miscellaneous weights: 11,400 tons, 47.4 %
      - Hull below water: 300 tons
      - Hull above water: 7,150 tons
      - On freeboard deck: 1,100 tons
      - Above deck: 2,850 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     34,214 lbs / 15,519 Kg = 332.3 x 6 " / 152 mm shells or 3.6 torpedoes
   Stability (Unstable if below 1.00): 1.02
   Metacentric height 3.9 ft / 1.2 m
   Roll period: 17.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 82 %
         - Recoil effect (Restricted arc if above 1.00): 0.00
   Seaboat quality  (Average = 1.00): 1.63

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.550 / 0.563
   Length to Beam Ratio: 8.40 : 1
   'Natural speed' for length: 26.25 kts
   Power going to wave formation at top speed: 43 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 10.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  27.89 ft / 8.50 m,  22.97 ft / 7.00 m
      - Forward deck:   30.00 %,  22.97 ft / 7.00 m,  18.04 ft / 5.50 m
      - Aft deck:   35.00 %,  18.04 ft / 5.50 m,  18.04 ft / 5.50 m
      - Quarter deck:   15.00 %,  18.04 ft / 5.50 m,  18.04 ft / 5.50 m
      - Average freeboard:      20.16 ft / 6.15 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 67.3 %
      - Above water (accommodation/working, high = better): 149.3 %
   Waterplane Area: 39,438 Square feet or 3,664 Square metres
   Displacement factor (Displacement / loading): 148 %
   Structure weight / hull surface area: 105 lbs/sq ft or 514 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 1.00
      - Longitudinal: 1.02
      - 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, rides out heavy weather easily

Carries 200 first-class passengers, 400 second-class passengers, and 1200 third-class passengers.  Also carries 50 50-person lifeboats.

Cargo capacity is 300 tons.

[KWorld]

And here's the same hull with 2.00 seakeeping.  This cuts into the accommodations, but less than you might expect.  The good thing is there's lots of steadiness to use to trim for stability.

Unk-Liner 11, Unknown Unk-Liner laid down 1911

Displacement:
   19,941 t light; 20,421 t standard; 24,036 t normal; 26,928 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (694.18 ft / 688.98 ft) x 82.02 ft x (27.07 / 29.63 ft)
   (211.59 m / 210.00 m) x 25.00 m  x (8.25 / 9.03 m)

Machinery:
   Coal fired boilers, steam turbines,
   Direct drive, 2 shafts, 54,390 shp / 40,575 Kw = 25.00 kts
   Range 3,000nm at 22.00 kts
   Bunker at max displacement = 6,506 tons (100% coal)

Complement:
   964 - 1,254

Cost:
   £1.038 million / $4.151 million

Distribution of weights at normal displacement:
   Armament: 0 tons, 0.0 %
   Machinery: 2,428 tons, 10.1 %
   Hull, fittings & equipment: 6,613 tons, 27.5 %
   Fuel, ammunition & stores: 4,095 tons, 17.0 %
   Miscellaneous weights: 10,900 tons, 45.3 %
      - Hull below water: 300 tons
      - Hull above water: 6,825 tons
      - On freeboard deck: 1,575 tons
      - Above deck: 2,200 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     39,505 lbs / 17,919 Kg = 383.6 x 6 " / 152 mm shells or 3.8 torpedoes
   Stability (Unstable if below 1.00): 1.01
   Metacentric height 3.8 ft / 1.2 m
   Roll period: 17.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 100 %
         - Recoil effect (Restricted arc if above 1.00): 0.00
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.550 / 0.563
   Length to Beam Ratio: 8.40 : 1
   'Natural speed' for length: 26.25 kts
   Power going to wave formation at top speed: 43 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 10.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  29.53 ft / 9.00 m,  24.61 ft / 7.50 m
      - Forward deck:   30.00 %,  24.61 ft / 7.50 m,  24.61 ft / 7.50 m
      - Aft deck:   35.00 %,  24.61 ft / 7.50 m,  24.61 ft / 7.50 m
      - Quarter deck:   15.00 %,  24.61 ft / 7.50 m,  24.61 ft / 7.50 m
      - Average freeboard:      25.00 ft / 7.62 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 65.9 %
      - Above water (accommodation/working, high = better): 191.5 %
   Waterplane Area: 39,438 Square feet or 3,664 Square metres
   Displacement factor (Displacement / loading): 153 %
   Structure weight / hull surface area: 108 lbs/sq ft or 529 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.98
      - Longitudinal: 1.34
      - Overall: 1.01
   Excellent machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, rides out heavy weather easily

Carries 120 first-class passengers, 330 second-class passengers, and 1375 third-class passengers.  Also carries 50 50-person lifeboats.

Cargo capacity is 300 tons.

[Carthaginian]

There seems to be marginal differences between the 65%/10%/25% I suggest and the 65%/15%/20% you suggest.

65%/10%/25%

Stability (Unstable if below 1.00): 1.02
   Metacentric height 3.9 ft / 1.2 m
   Roll period: 17.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 82 %
         - Recoil effect (Restricted arc if above 1.00): 0.00
   Seaboat quality  (Average = 1.00): 1.63

65%/15%/20%

Stability (Unstable if below 1.00): 1.03
   Metacentric height 3.9 ft / 1.2 m
   Roll period: 17.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 82 %
         - Recoil effect (Restricted arc if above 1.00): 0.00
   Seaboat quality  (Average = 1.00): 1.63

This tells me that we are getting close. Liners are not particularly 'steady' ships as they do tend to be more likely to roll over if flooded than warships. I think we're about where we need to be on these... if you run up on anything which might change the setup drastically, please let me know, but this might be it.