What do trim tabs do on an outboard motor?

Trim tabs are small adjustable plates mounted on the transom of a boat that help in managing the boat's angle and alignment in the water. The primary function of trim tabs is to keep the boat level and maintain a straight course while it is in motion. By adjusting the angle of the trim tabs, a boater can alter the distribution of weight and uplift on the hull, thereby optimizing performance, fuel efficiency, and comfort for those on board.

When the trim tabs are deployed, they create a force that helps counteract the boat's natural tendency to tilt or roll in response to waves and winds, significantly improving stability. Proper use of trim tabs can therefore enhance the overall handling of the boat, making it easier to navigate in varying sea conditions. This functionality is particularly crucial when planning at higher speeds, as it ensures the hull remains properly oriented in the water, preventing unnecessary drag and facilitating smoother riding.

The other options refer to functions unrelated to the role of trim tabs. While controlling engine speed, steering, and lowering the boat into the water are important aspects of boat operation, they are managed by different components such as the throttle, the rudder or steering wheel, and the hull design itself, rather than trim tabs.