re: Changing prop from plastic to aluminum on Merc 2.5hp - Will it help?

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I'd have buy an aluminum prop just for the sake of having the plastic for a spare. If you pick up speed, great. If not, you have a spare prop.

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I'd just stand pat. Having a spare prop for a canoe isn't a big of a deal. If you run across a problem where your prop is no longer good, paddle back. If for some reason you feel the need for a spare, just buy another plastic one for $15. You're not going to get 25% more speed out of an aluminum, if you get anything at all. Put that money towards a new cooler or rod and reel.