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Switching from Alu to SS Prop - change in pitch required ??

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  • Switching from Alu to SS Prop - change in pitch required ??

    Hi, There is SOOoooo much stuff on this issue, and I've sifted through plenty..... Thought I'd just ask a specific question.

    Going from a acceptable Alu Prop to SS......

    Rig;
    2000 Suntracker 18' party barge.
    2018 Merc 4Stroke Command thrust 60 hp.
    Current prop - Merc Black Diamond 14" x 11p rh Aluminum.
    MAx rpm 5800 approx 20 mph. (This old Pontoon is Heavy!)

    Just bought a Merc Vengeance Stainless steel 14 "x 10" Pitch prop.

    So ... Dropping 1" pitch and changing to Stainless.

    Did I just screw up ??

    Thanks! (Please be nice?)

  • #2
    To be honest, any time one swaps between AL and SS, it really is a Crapshoot, an Apples to Oranges comparison. They are so many different props, and each brand. and model has its own charateristics.
    You have introduced a few variables, Different Material, while both are Mercury Props, they are not identical, differences in Diameter, blade area, blade shape, cup and rake.
    The only way to find out is to run it. It might be Great, Good, Fair, No Different, or Outright Lousy.

    What is the WOT rpm range for your engine?
    Last edited by jimmbo; August 10th, 2019, 07:02 PM.

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    • #3
      Engine maxes out at 6000 rpm.

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      • #4
        You’ll probably be just fine and you may even pick up a few rpm. The vengeance is not an aggressive performance prop. It’s really a stainless casting of the standard aluminum black diamond.

        but as with all props, you won’t really know until you test it.
        1990 Wellcraft Eclipse 196
        Mercruiser Vortec 4.3 0M322285
        Alpha gen 1

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        • #5
          Originally posted by Canufixit2 View Post
          Hi, There is SOOoooo much stuff on this issue, and I've sifted through plenty..... Thought I'd just ask a specific question.

          Going from a acceptable Alu Prop to SS......

          Rig;
          2000 Suntracker 18' party barge.
          2018 Merc 4Stroke Command thrust 60 hp.
          Current prop - Merc Black Diamond 14" x 11p rh Aluminum.
          MAx rpm 5800 approx 20 mph. (This old Pontoon is Heavy!)

          Just bought a Merc Vengeance Stainless steel 14 "x 10" Pitch prop.

          So ... Dropping 1" pitch and changing to Stainless.

          Did I just screw up ??

          Thanks! (Please be nice?)
          I don't think so. The SS performance enhancements will make up the 1" pitch you lost and probably give you some performance to boot. It'll eat into those too high rpms and spit out some mph. Wink!
          If you are new to boating or have a new boat, a knowledgeable friend could show you how to operate your boat and save you a lot of grief, maybe some money, and maybe your life.

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          • #6
            Let's face it, how often are you going WOT on that pontoon? The lower pitch will help with acceleration and turning that beast, also may allow you to better tow something behind that beast. I think you will be quite happy with it, especially if that boat is fully loaded.

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            • #7
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              Thanks All, When I do install the Prop I'll advise here.....

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