I struggled to get a stable version of the "Super-Fast Light Battlecruiser"

One of the ships that I kepted working and reworking (with Rick Robinson's "Spring Style" ship design program) was the "Super-Fast Light Battlecruiser". What I finally ended up with was not so "Super-Fast", although 35 knots is pretty fast. This is what was produced, although it is not pretty:

fastcbl, laid down 1920

     Length, 804 ft x Beam, 87.0 ft x Depth, 29.5 ft
          34312 tons normal displacement (31571 tons standard)

     Main battery:       4 x 17.0-inch (2 x 2)
     Secondary battery: 16 x  4.0-inch

          Weight of broadside: 10338 lbs

     Main belt, 4.0 inches; ends unarmored
     Upper belt, 4.0 inches
     Torpedo bulkhead, 1.0 inches
     Armor deck, average 2.0 inches
     C.T., 4.0 inches

     Battery armor:
          Main, 4.0"
          

     Maximum speed for 225027 shp = 34.43 knots
          Approximate cruising radius, 14500 nm / 12 kts

     Typical complement: 1261-1639


                    Estimated cost, $30.612 million (£7.653 million)

          Remarks:

     Relative extent of belt armor, 55 percent of 'typical' coverage.

     Main belt does not fully protect magazines and
     engineering spaces.

     Magazines and engineering spaces are cramped, with poor
     watertight subdivision.

     Roomy upper decks; superior accommodation and working space.


          Distribution of weights:
                                                       Percent
                                                       normal
                                                    displacement:

          Armament .........................   1292 tons =   4 pct
          Armor, total .....................   4014 tons =  12 pct

               Belt                             912 tons =   3 pct
               Torpedo bulkhead                 570 tons =   2 pct
               Deck                            1801 tons =   5 pct
               C.T.                              91 tons =   0 pct
               Armament                         640 tons =   2 pct

          Machinery ........................   7868 tons =  23 pct
          Hull and fittings; equipment .....  14289 tons =  42 pct
          Fuel, ammunition, stores .........   4289 tons =  13 pct
          Miscellaneous weights ............   2560 tons =   7 pct
                                              -----
                                              34312 tons = 100 pct

          Estimated metacentric height, 5.6 ft

     Displacement summary:

          Light ship:             30023 tons
          Standard displacement:  31571 tons
          Normal service:         34312 tons
          Full load:              36368 tons

          Loading submergence 1391 tons/foot

     +++++++++++++++++++++++++


     Estimated overall survivability and seakeeping ability:

          Relative margin of stability: 1.19

          Shellfire needed to sink: 18353 lbs = 7.5 x 17.0-inch shells
               (Approximates weight of penetrating
               shell hits needed to sink ship,
               not counting critical hits)

          Torpedoes needed to sink: 2.1
               (Approximates number of 'typical'
               torpedo hits needed to sink ship)

          Relative steadiness as gun platform, 48 percent
               (50 percent is 'average')

          Relative rocking effect from firing to beam, 0.65

          Relative quality as a seaboat: 1.02

     +++++++++++++++++++++++++


     Hull form characteristics:

          Block coefficient: 0.58
          Sharpness coefficient: 0.37
          Hull speed coefficient 'M' = 7.57
          'Natural speed' for length = 28.4 knots
          Power going to wave formation
               at top speed: 56 percent


     Estimated hull characteristics and strength:

          Relative underwater volume absorbed by
               magazines and engineering spaces: 145 percent

          Relative accommodation and working space: 191 percent


          Displacement factor: 106 percent
               (Displacement relative to loading factors)


          Relative cross-sectional hull strength: 1.08
               (Structure weight per square
               foot of hull surface: 187 lbs)

          Relative longitudinal hull strength: 1.45
               (for 26.0 ft average freeboard;
               freeboard adjustment +6.6 ft)

          Relative composite hull strength: 1.11