What was found
THE START UP WAS UNEVENTFUL, AND THE RUN UP CHECKS WERE COMPLETED WITHOUT ANY DISCREPANCIES. CLEARED FOR TAKEOFF, TAXIED OUT, AND CAME TO A FULL STOP. PERFORMED A STATIC TAKEOFF WITH POWER SET AT 85% TORQUE AND V SPEEDS OF (97,102,107) WITH FLAPS APPROACH. THE TAKEOFF ROLE STARTED OUT NORMAL AND HEARD CREW CALL AIRSPEED ALIVE, AND THEN 80 KNOTS CROSS CHECK. BETWEEN THE 80 KNOTS CALL OUT AND HIS V1 CALL THE AIRPLANE YAWED SIGNIFICANTLY TO THE LEFT, WITHOUT PILOT INPUT, AND AFTER THE CHANGE IN DIRECTIONAL CONTROL, IMMEDIATELY WENT TO GROUND FINE AND ABORTED THE TAKEOFF. TAXIED OFF THE RUNWAY, AND RETURNED TO THE RAMP. IT SEEMED LIKE THE LEFT PROP WENT INTO LOW PITCH SETTING.