Yamaha F8F Owner's Manual

Also see for F6D: Ower's manual

Operation51TIP:While the boat is moving, it may be difficult toadjust the trim angle due to water pressure.Before adjusting the trim angle, reduce theboat speed and shift into neutral.(2) Tilt the outboard motor to the desired an-gle using the power tilt switch.To raise the bow (“trim-out”), tilt the outboardmotor up.To lower the bow (“trim-in”), tilt the outboardmotor down.Make test runs with the trim set to differentangles to find the position that works best foryour boat and operating conditions.TIP:Stay within the trim operating angle whentrimming the outboard motor using the powertilt system.EMU27913Adjusting 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. When the bow ofthe boat is down, it is easier to acceleratefrom 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 moreair drag. Excessive trim-out can also causethe propeller to ventilate, which reduces per-formance further, and the boat may “por-poise” (hop in the water), which could throwthe operator 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. Oper-ating 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.DNUPZMU01720