On December 15, 1996, about 1030 eastern standard time, a Cessna 152, N714YW, operated by Free Flight Aviation Inc., was substantially damaged when it impacted trees during the initial takeoff climb from the Baltimore Airpark (1W2), Baltimore, Maryland. The certificated flight instructor and student pilot were not injured. Visual meteorological conditions prevailed for the flight destined for Martin State Airport (MTN), Baltimore, Maryland. No flight plan was filed for the flight conducted under 14 CFR Part 91. In a statement submitted by the flight instructor, he stated that the flight originated earlier that morning at the Martin State Airport (MTN), Baltimore, Maryland. Prior to landing at 1W2, the flight involved a series of maneuvers during which no problems were encountered. He then intended to depart runway 27, a 2,200 foot long, 49 foot wide, runway from 1W2. A short field takeoff was performed with the use of 10 degrees of flaps and brake application while applying full power. The instructor stated, "We did pre-takeoff check, set 10 degrees flap, taxied out to position [and] held the brakes. Applied full power, checked for RPM and released brakes. . . .We lifted out past midfield down runway, the plane did not want to climb out and more back pressure caused a stall chirp. When we got out of ground effect, we got another stall chirp. . . ." The airplane impacted trees at the departure end of the runway. The pilot stated that he then elected to continue to MTN, located about 5 miles south. When the flight arrived at MTN, a low approach was performed for ground personnel to check for landing gear damage, followed by a full stop landing. The Federal Aviation Administration Inspector conducted an engine test run. During the engine run, a static run-up was performed satisfactorily.