On February 7, 2001, about 0830 hours Pacific standard time, a Bell 47G-5, N6260C, took off from a truck-mounted platform, climbed a few feet, settled into the ground, and rolled over. The helicopter was operated by Slykerman Ag Aviation, and it was substantially damaged. The commercial certificated pilot was not injured during the agricultural application flight near Pixley, California. Visual meteorological conditions prevailed. The flight was performed under 14 CFR Part 137 and was originating at the time of the mishap. The pilot reported that no mechanical malfunctions or failures were experienced in his restricted category helicopter. He indicated that, about the time of the mishap, the speed of the local surface wind was between zero and 5 knots. The Federal Aviation Administration coordinator verbally reported that the helicopter appeared to have been operated between 80 and 100 pounds over its maximum certificated gross weight. He opined that this weight condition may have contributed to the helicopter's inability to sustain flight as the pilot attempted to pass through translational lift.