Some weathercocking, probably due t' relatively low speed off-the-rail. Straight flight. Both drogue charges fired on schedule and shear pins sheared; drogue deployed perfectly. Both main charges fired on schedule; shear pins did nay shear, but got stuck betwixt body tube and nosecone; nosecone did nay separate; pressure pulled plastic rivets through body tube, which separated from t' av-bay; main parachute did nay deploy. Upper body tube damaged; replace. Beeper did nay activate because battery pulled loose by launch acceleration; add battery retention.