This month marks 50 years since the BO-105 helicopter. It made its maiden flight on 16 February 1967, in Ottobrunn near Munich. Conceived as a two tonne-class light multi-purpose helicopter, cutting-edge technologies and materials led to the model being the first aircraft to feature a rigid, hingeless rotor head made of titanium and glass-fibre-reinforced rotor blades. Its first delivery in 1970;...