 Pari gbolohun ti o tẹle: Hempel dije lati opin ọdun 1970 si aarin ọdun 1980. O gba ami ẹyẹ mẹsan ni ICF Canoe Sprint World Championships pẹlu wura mẹta K-4 500 m: : 1983, 1985; K-4 1000 m: 1981, fadaka mẹta K-1 500 m: 1982, K-4 1000 m: 1982, 1983, ati idẹ mẹta K-1 500 m: 1978, 1979; K-4 1000 m: 1985. 