My 54 mm rocket (Cesaroni 168H54-10A): 1.120 m long, 56.3 mm across
Not yet validated: see the Accuracy page before trusting these numbers.

                                   liftoff   burnout
mass (kg)                            0.675     0.579
center of gravity (m from nose)      0.671     0.610
center of pressure (m from nose)     0.779     0.779
stability margin (calibres)           1.92      2.99

Normal-force slope (per radian) and center of pressure, at Mach 0.3:
nose        2.00 at 0.102 m
fins        4.82 at 1.060 m
rocket      6.82 at 0.779 m

From a 1.8 m vertical rail, with no wind:
Rail exit:  21.7 m/s
Apogee:     1144.5 m above the pad, at 13.92 s
Top speed:  187 m/s (Mach 0.56)
Ejection:   at 13.50 s, at 5.5 m/s

The fin set, as the design file stores it:
{
  "id": "fins",
  "name": "",
  "part": {
    "fin_set": {
      "count": 3,
      "planform": {
        "kind": "trapezoidal",
        "root_chord_m": 0.1,
        "tip_chord_m": 0.04,
        "span_m": 0.045,
        "sweep_m": 0.05
      },
      "thickness_m": 0.003175,
      "cross_section": "rounded",
      "tab": null,
      "cant_rad": 0.0,
      "base_angle_rad": 0.0,
      "material": {
        "name": "Birch plywood",
        "density": {
          "kind": "bulk",
          "kg_m3": 680.0
        }
      }
    }
  },
  "position": {
    "from": "bottom",
    "aft_offset_m": 0.0
  }
}
