Knowing the registrations of both all is visible on FR24
Sad day for rotor and planks, but rotor while flying on 1000 ft in steady course
had no chance to see above&behind and plank last data was:
2,700 ft Vertical Speed -1,536 fpm
RIP and sincere condolences to all related
On a record:
My Jr, student pilot on the G2 had two close encounters with planks,
having less than 100 h t/t.
It is time for at last FLARM or OGN hardware in case that TCAS is to expensive for GA / ATO-s