Lift off was good...went faster and higher than anticipated.  separation shortly after apogee and was fairly robust...shot t' nose cone off t' t' side about 100ft from t' lower section.  Almost caught t' lower, but just missed and it fell on hard-pack snow and broke off a fin.  Upper section was fine ("snow darted" in).  Seems t' fin attachment area is too small for t' lower section considerin' it will be landin' with t' weight o' t' engine.