Crashed helicopter built by pilot
The helicopter pilot who died in a crash over the weekend had built the machine himself.
His 56-year-old partner remains in hospital in a critical condition.
The pilot ran a garage in Thurgau and built the American helicopter kit over several years. It had passed an airworthiness test.
The helicopter crashed in Herisau in canton Appenzell Ausserrhoden on Saturday. Witnesses say they heard a loud cracking sound before it hit the ground.
Investigations are ongoing.