Mercury D2.8L D-Tronic Specifications download pdf (Page 59)

ON THE WATER

SECTION 3

9CMD-4081850 / 90-860094030 SEPTEMBER 2003 Page 51

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Conditions Affecting Operation

Weight Distribution (Passengers And Gear) Inside The Boat

Shifting weight to rear (stern):

• Generally increases speed and engine rpm

• Causes bow to bounce in choppy water

• Increases danger of following wave splashing into the boat when coming off plane

• At extremes, can cause the boat to porpoise

Shifting weight to front (bow):

• Improves ease of planing

• Improves rough water ride

• At extremes, can cause the boat to veer back and forth (bow steer)

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Bottom Of Boat

To maintain maximum speed, the boat bottom should be:

• Clean, free of barnacles and marine growth

• Free of distortion; nearly flat where it contacts the water

• Straight and smooth, fore and aft

Marine vegetation may accumulate when the boat is docked. This growth must be removed

before operation; it may clog the water inlets and cause the engine to overheat.

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Cavitation

Cavitation occurs when water flow cannot follow the contour of a fast-moving underwater

object, such as a gear housing or a propeller. Cavitation permits the propeller to speed up,

but the boat speed to reduce. Cavitation can seriously erode the surface of the gear housing

or the propeller. Common causes of cavitation are:

• Weeds or other debris snagged on the propeller

• Bent propeller blade

• Raised burrs or sharp edges on the propeller

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Mercury D2.8L D-Tronic Specifications Page 59