On March 3, 2001, at 1430 Eastern Standard Time, a homebuilt Rotorway Exec 162F helicopter, N929BL, was substantially damaged when it struck trees after lifting to a hover in an open field in Wallingford, Connecticut. The certificated flight instructor and student pilot/builder were not injured. Visual meteorological conditions prevailed and no flight plan was filed for the instructional flight conducted under 14 CFR Part 91. In a written statement, the flight instructor stated: "I [name] was preparing for a training flight with student [name] in a Rotorway helicopter. The plan was for me to depart [student's] residence (Wallingford, CT) solo (left seat) and fly across the street to an open field. [The student] was to meet me there and move the ballast weight from the right front skid tube (fwd) to the tail cone (aft). I took off from [student's] yard about 14:30 EST and landed in the field across the street, about 40 ft from the road facing the tree line. [Student] approached the left door and expressed his concern about the skids on the dirt surface. I assured him that the surface was quite firm and safe. I slid across to the right seat and [student] got into the left seat and we buckled in. We had both forgotten about repositioning the ballast weight. I had the controls and I ran the engine up readying for a lift to hover. I did not use the pre take-off checklist, which would have reminded me about the ballast weight position. With 2 pilots onboard and the ballast in the forward position the helicopter was out of C.G. limits (nose heavy). When I lifted the helicopter to hover the nose pitched down and the helicopter accelerated forward. I applied full aft cyclic stick but the helicopter went between 2 trees and the main rotor blades struck the trees. The forward motion stopped-the helicopter yawed left-then fell to rest on the left side. I climbed out of the right door and [student] followed me out." A Federal Aviation Administration (FAA) inspector performed an on-scene examination on March 3, 2001. According to the inspector, the helicopter sustained substantial damage to the main rotor system, both rotor blades, the tail boom, left side of the fuselage, and skids. Examination of the Rotorway International Exec 162F flight manual revealed that item four on the Start Up/Run Up and Take-off checklist stated, "Check ballast weight location." Further examination of the flight manual revealed that in the weight and balance section, it stated: "SOLO flight is performed ONLY FROM THE LEFT SEAT, and must have the ballast weight placed on the front passenger skid. DUAL flight requires the ballast weight be placed on the rear mount tube under the tail boom." The flight instructor reported 3,725 total flight hours in helicopters; 8 hours in make and model, of which 3 hours were logged as instructor. The flight instructor also reported there were no mechanical malfunctions.