 Nyorai kupfuurira kweiyi ndima - Kottmann, akaberekwa muna 1932 muZurich, akatanga kukwasva aine makore 13 neBelvoir Ruderclub muguta rake. Kwemakore anoverengeka, akakwasva naRolf Streuli uye vakasiyana-siyana vecoxswains mumutambo wecoxed pair. Vakakunda European Rowing Championships muna 1954 muAmsterdam, muna 1955 muGhent, uye vakava wechipiri muna 1956 muBled. Vakanga vakwanisa kupinda muMitambo yeOlympic yeZhizha ya1956 muMelbourne asi Switzerland yaiva imwe yenyika ina dzakaramba mitambo yacho nemhaka yokupinda kweSoviet muHungary. Pa1958 European Rowing Championships muPoznań, Kottmann naStreuli vakakunda bronze. 