Sequence of Events
The pilot reported that during the takeoff, the ground run was longer than usual, prompting consideration of aborting the departure. The aircraft became airborne but began to sink at an altitude of 30 to 40 feet above ground level. It subsequently struck a fence post and touched down in a plowed field. The impact caused the nose gear to collapse, and the aircraft nosed over.
Pilot Actions
Prior to the accident, the pilot had aborted one takeoff because of an extended ground run. During the accident takeoff, he was prepared to abort again but the aircraft lifted off before he could do so.
Environmental Conditions
The airstrip being used was reported to be softer than normal. The pilot indicated that a large grove of trees and buildings located directly east of the southern portion of the runway could, under the right conditions with an east wind, create a downdraft or low lift condition. Local winds during the takeoff were from the east.
Post-Accident Examination
An engine test run conducted after the accident found no mechanical failures or malfunctions.