Hahne participated in the 1966 and 1969 German Grands Prix in the special Formula Two sections of those events, but withdrew before the start of the 1969 event due to the fatal accident suffered by his team-mate Gerhard Mitter.
Hahne participou no Gran Premio de Alemaña de 1966 e no Gran Premio de Alemaña de 1969, nas series especiais da Fórmula 2 dos devanditos eventos, pero retirouse antes do inicio do evento de 1969 debido ao accidente mortal sufrido polo seu compañeiro de equipo Gerhard Mitter.