The 56'sloop PLYM did not have an engine when she was launched in 1948 in Sweden, but it wasn't long before her owners decided they needed one. Her first was a gasoline-powered engine installed in the 1950s, with the propeller shaft offset to one side to stay clear of her keel-hung rudder. A Westerbeke diesel replaced the gasoline engine in the 1970s, using the same shaft arrangement. But 20 years later, by then newly arrived in Sydney, Australia, PLYM had a new Volvo Penta diesel and a centerline propeller shaft installed. That change was accomplished by making the original rudder a fixed, permanent extension of the keel and mounting a new spade rudder farther aft.
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