I replaced the Martec on my 35-3 many years ago with a Flex-0-Fold 2
blade. Absolutely no complaints drives the boat very well. The only
issue worth mentioning is you need to mark your prop shaft to note when
the blades are at the 9 & 3 position when racing. otherwise, one blade
may flop opened and create extra drag.
Howard Paul, Skipper of Knot Again
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