Preliminary ATSB report with some further images and descriptions.
Examination of the Cub indicated that contact damage was limited to the right wing structure consistent with the R44 main rotor blades impacting the right wing support struts. Following that contact, the wing fractured at the inboard attachment fittings and detached from the fuselage. The aircraft then impacted the ground inverted in a steep, nose-down attitude. Following the initial impact, the aircraft rotated to the right before coming to rest, inverted, a short distance from the initial impact point
Examination of the R44 revealed substantial damage to one of the main rotor blades consistent with the mid-air collision (Figure 6). A section of the blade’s skin and honeycomb structure was forced upwards between the leading edge spar and the trim tab, with part of the Cub’s wing skin fabric retained within the blade. In addition, the blade tip had a section of the skin and honeycomb missing at the trailing edge. Both main rotor blades showed paint transfer along the majority of their length, in addition to creases on the lower surface of the blades’ skin.