On March 11, 1995, at 0730 eastern standard time, N2346P, a Robinson R-22B helicopter, owned and operated by Advanced Helicopter Concepts Inc. of Frederick, Maryland, crashed during takeoff at Frederick Municipal Airport, Frederick, Maryland. Visual meteorological conditions prevailed and a flight plan was not filed. The certificated private pilot, the sole occupant, was not injured. The helicopter sustained substantial damage. The local, personal flight was conducted under 14 CFR 91. According to an FAA Aviation Safety Inspector, the pilot was attempting to liftoff from a dolly when the left skid hooked onto the dolly and rolled over. The pilot reported to the FAA that he completed his preflight inspection and engine run-up check successfully. The pilot stated the helicopter lifted off once, but there was a loss of rotor RPM and the helicopter settled back onto the platform. When the pilot added power to attempt a second takeoff, the helicopter skid was hooked on the dolly and the helicopter rolled onto the asphalt field. An FAA Aviation Safety Inspector examined the helicopter at the accident site. The examination revealed that the main rotor blades contacted the asphalt field separating sections of the blades. The examination did not reveal evidence of preimpact mechanical malfunction.