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| Inboard
Questions • Outboards
Questions |
Q:
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My
houseboat plows when the sterndrives are tilted to the furthest lock
bar position. In an attempt to correct the bow-down attitude, the
propellers cavitate. Why?
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A: |
The bow-down attitude results from the longitudinal position
of the center of gravity being forward of midships. Merely changing
shaft angle will not correct the severe plowing which would be experienced.
As the lower unit is tilted toward the furthest lockbar position,
effectively changing the shaft angle, the depth the propeller is immersed
is decreased and ventilation will occur causing a breakdown of thrust.
This phenomenon is sometimes mistakenly termed cavitation. |
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