What happened
The flight began with the pilot performing an off-airport landing because an onboard observer had become ill. Once the observer recovered, the pilot attempted to initiate a takeoff from the same location.
Positioning the helicopter into the wind, the pilot increased the collective. During this maneuver, the left skid lifted from the ground first. In response, the pilot applied what he believed was an appropriate correction by using more left cyclic. As the maneuver continued, the pilot felt the left skid continue to rise and perceived that the right skid had become hooked on the ground.
In an attempt to stabilize the aircraft, the pilot applied full left cyclic deflection and lowered the collective. At that moment, a wind shift accompanied by a gust blew under the rotor system, pushing the aircraft over. The main rotor blades struck the ground, causing the helicopter to come to rest on its right side. The pilot was not injured.