Even with a well built and balanced boat like a Crownline, Trim Tabs offer an range of benefits for the average boater. Such as, increased vessel performance and efficiency, getting on plane quicker, correct porpoising and adjusting the boat’s attitude for changes in speed. (Learn more about Crownline’s F.A.S.T. Tab Performance Hull)

Trim tabs are super-easy to use and after just a few times using will become second nature. The concept is simple but the results are impressive!

What are TRIM TABS?

Trim tabs work like ailerons and elevators on an airplane, providing lift when and where you need it. Tabs are usually a pair of stainless-steel planes mounted on the boat’s transom that are raised or lowered by a hydraulic or electric ram. The size of the tab, the angle of deflection and the boat’s speed combine to create lift at the stern.

Trim Tabs
The electric/hydraulic trim tabs are adjusted at the helm. Water is deflected and
redirected as the trim tabs move through the water and they are raised and lowered.
This change in water flow creates upward pressure under the tabs and raises the
stern. When the stern raises, the bow is lowered.
Trim tabs act in the same way as the power trim on the drive unit. This allows
compensation for uneven loads by trimming up one side or the other. They also
assist in providing maximum control of the hull in different water and load conditions.
If used properly, trim tabs can greatly improve performance and fuel efficiency. The
proper use of trim tabs requires a basic understanding of trim tab operation and
some practice in calm water.

How to Use Trim Tabs

Lenco Trim Tabs

Your trim tab control has two (2) two-position, momentary switches labeled Bow
Down and Bow Up:

  •  Depress front-starboard button to move trim plane on port side downward.
    This moves starboard bow downward when boat is planing.
  •  Depress front-port button to move trim plane on starboard side downward.
    This moves port bow downward when boat is planing.
  • Depress back-starboard button to move trim plane on port side upward.
    This moves starboard bow upward when boat is planing.

Using trim tabs in conjunction with the power trim will compensate for uneven weight
distribution, listing, water conditions and other factors that cause inefficient operation.
Remember that trim tabs are trimming the hull while power trim is trimming the
engine drive.

Do You Need Trim Tabs?

The short answer is no, they are not needed to have a safe and pleasurable boating experience.  But, they could be useful if you have these problems:

  • If your inflatable has to be run wide open to stay on plane, it would benefit from trim tabs.
  • If your bowrider sticks its nose in the air when you accelerate from idle, it would benefit from trim tabs.
  • If your cruiser burns a lot of extra fuel, because you have to run faster than you’d like to stay on plane, it would benefit from trim tabs.
  • If you’ve experienced a scary bow-high take off when crossing a wake and a scarier stern-first landing, you need trim tabs.


Visit Crownline’s Build A Boat and add Trim Tabs to your new boat order!