THIS WAS THE FIRST FLIGHT FOR THE 156 HOUR PRIVATE PILOT IN THIS MAKE AND MODEL AIRPLANE, HOWEVER, HE HAD PREVIOUSLY MADE SEVERAL HIGH SPEED TAXI RUNS IN IT. ACCORDING TO WITNESSES, THE PILOT USED ONLY ABOUT HALF THROTTLE FOR THE ATTEMPTED TAKEOFF. THE AIRCRAFT REPORTEDLY SHOULD HAVE LIFTED OFF WITHIN 300 FEET, BUT INSTEAD, IT FAILED TO BREAK GROUND UNTIL IT WAS ABOUT 2,000 FEET DOWN THE RUNWAY. IT CLIMBED TO ABOUT 50 FEET AGL AND THEN THE NOSE PITCHED UP TO ABOUT A 20 DEGREE ATTITUDE AND THE AIRSPEED DROPPED TO ABOUT 30 MPH OR LESS. IT THEN STALLED AND ROLLED SHARPLY LEFT AND WENT INVERTED. THE AIRCRAFT THEN ENTERED A NEAR VERTICAL NOSE DOWN ATTITUDE WHICH WAS MAINTAINED UNTIL GROUND IMPACT OCCURRED. POSTACCIDENT EXAMINATION OF THE WRECKAGE REVEALED NO EVIDENCE OF AIRCRAFT, ENGINE, OR SYSTEM FAILURE OR MALFUNCTION. LIKEWISE, THE PATHOLOGICAL AND TOXICOLOGICAL EXAMINATION OF THE PILOT REVEALED NO SIGNIFICANT FINDINGS.