DURING A FLIGHT TO TEST THE EFFECTIVENESS OF THE PROPELLER, JUST AFTER TAKEOFF, ONE PROPELLER BLADE SEPARATED FROM THE HUB. THE PILOT MADE AN EMERGENCY OFF FIELD LANDING IN A SOFT FIELD, WHERE DURING THE LANDING ROLL THE AIRCRAFT COLLIDED WITH THE TERRAIN. THE INVESTIGATION REVEALED THAT THE THREE BLADED PROP HAD NOT BEEN USED ON THIS ACFT/ENGINE BEFORE AND THE COMPOSITE CONSTRUCTED PROPELLER HAD BEEN MODIFIED BY THE PILOT BUILDER.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

Contributing Factors

TERRAIN CONDITION..SOFT

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