A trolling motor system is disclosed. The trolling motor system includes a lower propulsion unit, a mounting mechanism adapted to be coupled to the boat and a first shaft fitting at least partially between the mounting mechanism and the lower propulsion unit. The first shaft has a non-circular cross-sectional...http://www.google.fr/patents/US6254441?utm_source=gb-gplus-shareBrevet US6254441 - Trolling motor propulsion unit support shaft
