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.