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Designer's
Checklist No.1
Azimuth Stern Drive Tugs
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SKEG
Skeg
Size
The skeg can normally be very small without
losing the directional stability.
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Maximum
length of skeg
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A
short skeg will make the tug more manoeuvrable and
will improve astern running course keeping and performance.
In no case should the skeg run all the way to the
propulsors, when turned for astern sailing (see figures).
A
too long skeg will also make sidestepping difficult
as the water flow from the propulsor is re-directed
by skeg.
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Too
long a skeg
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The draft of the skeg should preferably be large enough
to go below the azimuth propulsors by 100…300mmHowever,
dry-docking procedures should be taken into account,
when the propulsion units are protruding below the bottom
of the tug hull. |
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