Trim Tabs -

I was on a survey the other day - when a first time big boat buyer asked me about trim tabs - so here's the pitch - Pitch or list of a vessel is controlled by trim tabs mounted on the stern of the vessel. The trim tabs are hinged along an axis transverse to the fore-aft direction of the vessel. A electro-hydraulic system changes the plane of the trim tabs in response to the vessel's operator which senses changes in the fore-aft level or list of vessel. Trim tabs should be always raised in following seas.