Single fin pedaling.
There has been some discussion about what to do if a fin, mast problem causes you to have just one fin operable while out. Well... paddle of course, but you can also use the single fin.
While full strokes do not work well, as the boat will rock from side to side, you can use short and more rapid strokes with the good fin nearly straight down. Keep the pedals more centered, this keeps the fin more vertical (Full leg extension places the fins against the hull.)
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Hobie Cat USA