At about 1230 mountain time, a Beech A36 struck a fence and terrain during a takeoff attempt from runway 21 at Sedona. The flight instructor, the pilot taking instruction and a passenger were killed. Several witnesses said the airplane did not seem to accelerate and was rolling very slowly with partial flaps deployed as it passed the midfield point. The airplane was still on the ground about 4,000 feet down the 5,132-foot runway. The airplane reached an altitude of only a few feet before crashing off the departure end.