My 54 mm rocket on an H54, fins of five spans, in calm air and a 5 m/s west wind
Not yet validated: see the Accuracy page before trusting these numbers.

fin span  liftoff  margin   apogee (m)       in the wind: drift (m)
    (mm)     (kg)   (cal)   calm   wind   apogee upwind  landing downwind
      25    0.666   -2.11   too little margin to fly
      35    0.671    0.33   too little margin to fly
      45    0.675    1.92   1145   1135             119              1068
      55    0.680    2.97   1126   1110             156              1001
      65    0.684    3.67   1107   1088             176               954
