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115 E-tec pushing a Whaler 190 (Montauk style hull) runs well with an Aluminum prop: 14.5" x 19". It needs replacement for the next season. Upon winterizing, I asked the boat yard to upgrade to an equivalent SST prop.

To my absolute surprise, the boatyard insists that the "equivalent" is a smaller wheel size: 13" x 19".

Does this sound correct, and why so/

Thank you for any expertise on this subject.