How Do I Set My Torque Trim Tab on My Outboard Motor?

How Do I Set My Torque Trim Tab on My Outboard Motor?

by Kyle McBride itstillruns article image

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Torque shipshape tab key aid to counteract the effects of torsion, or wheel-walk, on the vector of the gravy boat. Wheel-walk is a phenomenon that is created by differing water pressure at the top and the bottom of the propeller. As the propeller rotates through the water system, the press at the bottom of the propeller is greater than the blackmail at the top. This creates greater haul at the bottom than at the top and makes the propeller try on to “ walk ” sideways through the water. This makes a right-handed prop — a prop with clockwise rotation — act laterally through the water, and makes the austere of the gravy boat swing to the right, making the boat change state to the left when afoot. Counter-steering with the helm will not correct this and will only succeed in making the entire boat move at an devious slant to the focus that the bow is pointing.

Step 1

Test campaign the boat at entire speed with the steering amidships — in the center — to determine how much wheel-walk is occurring.. Observe how much the boat turns. Boats that turn opposite the property rotation need more angle on the tab key. Boats that turn the like guidance as the prop rotation motivation less angle on the tab.

Step 2

Stop the gravy boat to adjust the tab. Remove the plug on top of the anti-ventilation plate with the screwdriver to gain access to the clean-cut yellow journalism bang.

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Hold the shipshape yellow journalism firm in position by bridge player and loosen the trim tab key thunderbolt. Rotate the tab key in small increments in the appropriate direction, then hard tighten the thunderbolt. Reinstall the plug and test drive the boat again. Observe the boat ‘s handling and make farther adjustments as needed. Tips

  • The goal of this process is to make the boat track straight ahead when the steering is dead amidships — dead center — at full throttle. Continue adjusting the tab until this is achieved.
  • There is no magic formula to getting this adjustment right on the first try. Many factors, including boat design and ballast placement, can affect the boat’s handling and each boat and motor combination is different.
  • Unfortunately, the only way to adjust this is through trial and error. Making small adjustments and testing the motor is time consuming, but will prevent you from over-adjusting and forcing you to waste more time backing up and readjusting.

Things You ‘ll Need

  • Mechanic’s tools
  • Large flat screwdriver


  • Driving a boat that is badly out of trim is inefficient and potentially dangerous. It can cause you to waste fuel “going sideways” and cause the boat to meet oncoming waves with the broad side of the boat, instead of the much stronger bow section. The waves can cause the sides of the boat to collapse inward and can cause uncontrollable and unpredictable rolling motions that can damage equipment and injure crew, including the possibility of passengers being thrown overboard.

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