He won the gold medal in the four-man event at the 1979 FIBT World Championships in Königssee.
He won a bronze medal in the two-man event at the 1979 FIBT World Championships in Königssee.
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The FIBT World Championships 1986 took place in Königssee, West Germany for the second time, having hosted the event previously in 1979.
Schumann won a complete set of medals at the FIBT World Championships with a gold in 1974 (Four-man), a silver in 1979 (Two-man, despite being replaced by Fritz Ohlwärter after Schumann's injury during the third heat), and a bronze in 1977.