Mercury ALPHA Especificaciones descargar pdf (Pagina 39)

CA9

Cavitation

Cavitation occurs when water flow cannot follow the contour of a

fast-moving underwater object, such as a gear housing or 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 propeller. Common causes of cavitation are:

• Weeds or other debris snagged on propeller or gear housing.

• Bent propeller blade or damaged gear housing skeg.

• Raised burrs or sharp edges on propeller or gear housing.

CA10

Ventilation

Ventilation is caused by surface air or exhaust gases which are

introduced around the propeller resulting in propeller speedup and

a reduction in boat speed. Excessive ventilation is annoying and

usually caused by:

• Drive unit trimmed out too far.

• A missing propeller diffuser ring.

• A damaged propeller or gear housing, which allows exhaust

gases to escape between propeller and gear housing.

• Drive unit installed too high on transom.

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Mercury ALPHA Especificaciones Pagina 39