Early trials were carried out on English warships, using jointed shafts that could be lifted into a trunk in the hull when sailing. Prop drag has been an issue for sailing vessels since the propeller was invented. We then towed three typical props behind a test boat to measure their drag, and how it compares to the overall drag of a yacht under sail. It is this vital, unwanted component that sends you swinging off to one side when you try to stop suddenly, or back-up in the marina. We also measured propwalk while running astern.
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