While attempting to takeoff from a 1,865′ turf runway on an 85 degree day with four sky divers/passengers on board, the pilot was unable to attain sufficient airspeed for lift-off and elected to abort the takeoff. The pilot estimated that he had used about 60 – 70% of the runway before initiating the remedial action, and could not stop the aircraft before the end of the runway. It ran off the departure end of the runway, across a road, into a ditch, and then nosed over.
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