Berger BX-50

The Berger BX-50 was an experimental helicopter developed by Swiss inventor Hans Berger in 1961. Built largely at home, it was a single-seat design of conventional configuration with a bubble canopy, a two-blade rotor, and skid undercarriage. The upper portion of the canopy could slide to admit the pilot. After a number of test flights, the rotor was replaced with a semi-rigid three-blade design and the skids with tricycle, wheeled undercarriage. Not long after, it was damaged beyond repair and abandoned. In photographs, the registration number HB-XBC is visible, but this was never actually issued by Swiss authorities.