The pilot of the departing airplane’s failure to see and avoid the landing airplane before takeoff, resulting in a collision with the landing airplane. Contributing was the airport’s failure to encourage pilots to use radios for traffic deconfliction when equipped.

CLIMB NOT POSSIBLE BECAUSE OF A DOWNDRAFT WHICH EXCEEDED THE PERFORMANCE CAPABILITIES OF THE AIRPLANE. FACTORS RELATED TO THE ACCIDENT WERE: INADEQUATE LOCATION OF THE WIND SOCK, THE ADVERSE WIND CONDITIONS, AND THE TREES.