The expression «crank assembly» is used to describe the ensemble of the pedals, the crank shafts, the chainring, the chain or toothed belt, the partner sprocket and the auxiliary parts holding everything together.


Belt drive Johnson Big Chainring Lamar Crank


left: Rick Willoughby experimented with a toothed belt — center: Matt Johnson is using a big chainring — right: Lamar puts the chainring and small sprocket close together


During the development of pedalled propeller boats the great number of working solutions, how to get the propeller revolving, has continually decreased. Various approaches proved too complicated, others corroded too fast, others were too expensive… Now, although of course every individual boat builder is free to re-invent the wheel, there are a few things to keep in mind, based on what pioneer constructors are sharing about their experiences.



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