3-23EEMU01558Bow UpWhen the boat is on plane, a bow-up atti-tude results in less drag, greater stabilityand efficiency. This is generally when thekeel line of the boat is up about 3 to 5degrees. When trimmed out, the boat mayhave more tendency to steer to one side orthe other. Compensate for this as you steer.The trim tab can also be adjusted to help off-set this effect.Too much trim-out puts the bow of the boattoo high in the water. Performance andeconomy are decreased because the hull ofthe boat is pushing the water and there ismore air drag.Excessive trim-up can cause the propeller toventilate, which reduces performance fur-ther. When trimmed-out too much, a boatmay “porpoise” (hop in the water), whichcould throw the operator and passengersoverboard.EMU01559Bow DownWhen the bow of the boat is down, it is eas-ier to accelerate from a standing start ontoplane.Too much trim-in causes the boat to “plow”through the water, decreasing fuel economyand making it hard to increase speed.Operating with excessive trim-in at higherspeeds also makes the boat unstable.Resistance at the bow is greatly increased,heightening the danger of “bow steering”and making operation difficult and danger-ous.1 Bow up2 Bow down3 Optimum angle
