Got more than I bargained for on this flight. The B4 was WAY too much motor and I think everyone thought I'd lost my second rocket of the day when it boosted. Flight topped out at 311', ejected the spent motor and began heading toward the river/end of the field. It began circling back left a little, then more, and just as it looked like it was going to settle in for a landing, it caught a thermal. The thermal was short-lived, and it landed deep on the practice field out near the maintenance buildings.