In 1964, development work began at Bölkow upon the helicopter that would become the Bo 105, although work on the hingeless rotor it would use had begun earlier.
En 1964 comezou o desenvolvemento en Bölkow do helicóptero que se convertería no Bo 105, aínda que o traballo no rotor sen bisagras que se utilizaría comezara xa antes.