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It depends on how heavy the boat is and what performance you want from it. A 5hp outboard will happily push a 17ft fibreglass boat with a couple of adults aboard up to 4 or 5 mph in still water. but, acceleration will be slow and you will not make headway against any sort of current. Bear in mind also that these small engines need to be revved very high to keep the boat moving and so are not the best thing for river touring. I found that my, (rather heavy), 17ft dayboat performed fairly well in slow moving rivers using a 9.9hp outboard but needed a 25hp engine in order to make reasonable headway in tidal coastal waters and not feel vulnerable to the changing currents. If the transom will take the load I would go for something around 40hp to give good all-round performance.

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