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What is the purpose of a Trim Tab?

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  • What is the purpose of a Trim Tab?

    The trim Tab has always been broken on my force 40hp. Is it important to replace it. What is its purpose? Thanks Alot

  • #2
    Re: What is the purpose of a Trim Tab?

    If you're referring to that small zinc fin that attaches to the bottom back of your cavitation plate, then it's purpose is to counter act the steering torque of your motor's propeller. Say if you're cruising down the river at full or 3/4 throttle and you take your hand off the steering wheel, then the boat may tend to pull to the right or left, but if you have your trim tab set correctly the boat would continue in a straight line. The zinc trim tabs don't cost much, maybe $15, so they're good to have.

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    • #3
      Re: What is the purpose of a Trim Tab?

      ok thanks for the info

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      • #4
        Re: What is the purpose of a Trim Tab?

        Hi, I just joined the forum. I have had several boats in the past but this one I have now has me puzzled. I thought if your boat pulls to the right you would adjust the steering tab to the left (opposite the pull). I have mine all the way to the left and it still pulls right unless I trim the motor way out (not cavitating but I bet it would just a little more out). When trimmed in (bow down) it pulls progressively harder to the right. When I had it set about hafway to the left it would get pretty neutral as I trimmed out and then start pulling left. Any thoughts? GK

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        • #5
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          Re: What is the purpose of a Trim Tab?

          You need to start a new thread as it gets confusing mixing answers.

          Turning trailing edge of the trim left, turns the boat right.Click image for larger version

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