The local parachuting flight was to depart from the airport owned and maintained by the pilot. During the initial climb after takeoff from runway 09, the airplane drifted right and struck trees about 500 feet down the runway. The pilot stated that he did not see the trees before hitting them. A passenger stated that the pilot did not make any changes to the airplane's flight path prior to impact with the trees. The pilot and passenger both reported that the airplane's engine was operating normally.