He won two medals in the four-man event at the FIBT World Championships with a silver in 1973 and a bronze in 1974.

Competing in three Winter Olympics Delle Karth earned his best finish of fifth in the four-man event at Lake Placid in 1980.

In the 1985-86 Bobsleigh World Cup he finished second in the four-man championship.

In later years Delle Karth worked as the agent of multiple Olympic, World and World Cup champion alpine skier Hermann Maier.

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