Changing the prop on my pontoon boat used for flats fishing. Boat has a 40 hp Evinrude with a three blade aluminum prop, 12 1/4 X 15 with RC stamped on it. Does the "RC" mean it is a "cupped" prop? It doesn't really looked cupped, but it is well worn. This is a 1989 motor and it still has the original prop on it. Do you need a "cupped" or "non-cupped" on a 20 ft Lowe Pontoon boat? The boat seems to be fairly heavy. Any advantage in "cupped" vs "non-cupped"? Any information would be greatly appreciated. Everyone seems to carry replacement aluminum props of the same size in both "cupped" and "non-cupped" for less than $100, so its just a matter of knowing which will push my barge better. Thanks.
ST99
Replacement Prop Question
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