Yamaha F6D Ower's Manual

Also see for F6D: Owner's manual

Contents

Operation38NOTE:Stay within the trim operating angle whentrimming the outboard motor using the powertilt system.To raise the bow (“trim-out”), tilt the engine up.To lower the bow (“trim-in”), tilt the enginedown.Make test runs with the trim set to different an-gles to find the position that works best foryour boat and operating conditions.EMU27911Adjusting boat trimWhen the boat is on plane, a bow-up attituderesults in less drag, greater stability and effi-ciency. This is generally when the keel line ofthe boat is up about 3 to 5 degrees. With thebow up, the boat may have a greater tenden-cy to steer to one side or the other. Compen-sate for this as you steer. The trim tab canalso be adjusted to help offset this effect.When the bow of the boat is down, it is easierto accelerate from a standing start onto plane.Bow UpToo much trim-out puts the bow of the boattoo high in the water. Performance and econ-omy are decreased because the hull of theboat is pushing the water and there is more airdrag. Excessive trim-out can also cause thepropeller to ventilate, which reduces perfor-mance further, and the boat may “porpoise”(hop in the water), which could throw the op-erator and passengers overboard.Bow DownToo much trim-in causes the boat to “plow”through the water, decreasing fuel economyand making it hard to increase speed. Operat-ing with excessive trim-in at higher speedsalso makes the boat unstable. Resistance atthe bow is greatly increased, heightening thedanger of “bow steering” and making opera-tion difficult and dangerous.NOTE:Depending on the type of boat, the outboardmotor trim angle may have little effect on thetrim of the boat when operating.EMU27931Tilting up and downIf the engine will be stopped for some time orif the boat is moored in shallows, the outboardmotor should be tilted up to protect the propel-