What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
privacy data omitted Was operating an experinmental helicopter (mosquito)that was amuertuer built in his backyard without prior experience in the mosquito.
This helicopter was not certificated by the FAA nor did it have an "n" number
Upon lift off from his backyard, an excessive rate of yaw developed with an increase in altitude to about 80 feet. The helicopter ascended rapidly and descended rapidly. The helicopter landed un an uneven surface and rolled left, coming to rest destroying the aircraft.
As the FAA filed it
^PRIVACY DATA OMITTED^ WAS OPERATING AN EXPERINMENTAL HELICOPTER (MOSQUITO)THAT WAS AMUERTUER BUILT IN HIS BACKYARD WITHOUT PRIOR EXPERIENCE IN THE MOSQUITO.
THIS HELICOPTER WAS NOT CERTIFICATED BY THE FAA NOR DID IT HAVE AN "N" NUMBER
UPON LIFT OFF FROM HIS BACKYARD, AN EXCESSIVE RATE OF YAW DEVELOPED WITH AN INCREASE IN ALTITUDE TO ABOUT 80 FEET. THE HELICOPTER ASCENDED RAPIDLY AND DESCENDED RAPIDLY. THE HELICOPTER LANDED UN AN UNEVEN SURFACE AND ROLLED LEFT, COMING TO REST DESTROYING THE AIRCRAFT.