Time to Trim

Boater-ese.

Trim out (push the top of the trim button) when the boat is on plane and you want to go faster. This causes the lower unit to tilt away from the transom. Trimming out raises the bow and rocks the boat back onto the aft third of the bottom, the surface designed for most efficient high-speed running in a planing hull.

This reduces what engineers call the wetted surface, the section of bottom in contact with the water, and consequently cuts drag and improves speed and fuel economy.

In the extremes, as in high-performance bass boats and racing boats, the front half of the boat is actually out of the water. On family boats, the front may just touch the surface, but it's not plowing along as it would under zero or negative trim.

Negative trim is when the lower unit of an outdrive is tilted in toward the transom. Positive trim is when the lower unit of an outdrive is tilted away from the transom.

With the bow forced upward by trimming out the twin outboards, this Monza can get anglers offshore in a hurry.

(Photo credit: Haber & Quinn)

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