[Descant]

Originally Posted by BroadHopper

There are two types of adjustable trims. drive trims and transom trims. All boats except inboards have drive trims. Performance boats and some inboards have transom trims.

Drive trims are used to provide the 'attitude' of the bow. When the drive is down the bow is down, drive up, bow up.

Transom trims are use mainly to help level the boat from port to starboard or vice versa. On ski boats, with the trim down, there is less wake, trim up there is more.

On performance boats the throttle man usually use the transom trims to adjust the stern attitude along with the drive trims adjustment to provide a nice 'tude at speed and chops.

Technically on a semi V or flat bottom boat, you would want the bow down (trim down) in choppy weather to 'plow thru the waves. At speed you will trim up until the rpm rises, tap back down. At times a boat will porpoise or chine walk before rpm increases, tap it back down.

Deep Vs especially heavy ones you would want the trim horizontal to the hull in chops. You would want to ride through the waves than plow into them.

One of the most memorable experience using trims is the dancing from one swell to the next at the Cigarette Top Gun School in Aventura FL!

Good post. Thank you.