3.17
S
ECTION
3 • U
SING
Y
OUR
B
OAT
44 Sedan Bridge (
455 Sedan Bridge
)
Scope =
Rode Length
Bow Water Depth
NOTE:
Before using the anchor, be sure the anchor
safety lanyard is removed from the anchor, the
chain stop (if equipped) is released from the chain
and the anchor is secured to the windlass chain.
B. A
NCHORING
Proper anchoring requires knowledge of RODE and
SCOPE. Read this section carefully, understanding
the relationship between rode, scope and anchor
performance.
The
rode
is the line connecting the anchor to the
boat. The
scope
is technically defined as the ratio
of the rode length to the vertical distance from the
bow to the sea floor.
Since you want to know how much rode to use when
anchoring, the formula is:
Rode Length = (Bow Water Depth) x Scope
•
Scope depends on the type of anchor, bottom,
tide, wind and sea conditions.
•
Minimum is 5:1 for calm conditions; norm is 7:1;
severe conditions may require 10:1.
Example:
Rode Length = (3 feet + 10 feet) x 7*
Rode Length = 13 feet x 7*
Rode Length = 91 feet
* Scope factor may range from 5 to 10 or
more. Less than 5, the anchor breaks out
too easily.
C. L
OWERING
A
NCHOR
•
Be sure there is adequate rode.
•
Secure rode to both the anchor and the boat.
•
Stop completely before lowering anchor.
•
If using windlass, refer to windlass operator’s
manual.
•
Keep feet clear of coiled line.
•
Turn on anchor light when at anchor or drifting
(not under power).
D. S
ETTING
A
NCHOR
•
There is no best way to set an anchor.
Experiment to see how your anchor performs.
•
One method is to turn the rode around a bit
and slowly pay out as the boat backs from the
anchor site. When the proper scope has been
reached, snub the rode quickly, causing the
anchor to dig into the bottom.
•
Reverse engine slowly to drive the anchor in
and prevent it from dragging.
•
Close chain stop (Optional) (see Fig. 3.15.2).
E. W
EIGHING
A
NCHOR
•
Run the boat slowly up to the anchor, taking in
the rode as you go.
•
The anchor will usually break out when the rode
becomes vertical.
•
Be careful that trailing lines do not foul in the
propeller.
NOTE:
Use the fresh water washdown spigot in
the starboard bow locker to hose down the chain
in the locker after haul-in .
F. C
LEARING
A
F
OULED
A
NCHOR
A fouled anchor can test your patience and ingenuity.
One of the best methods of breaking free is to set a
tripline
(see Fig. 3.13.2) before you lower anchor.
•
Attach a line to the crown or head of the anchor
and the other end to a float.
•
The line should be just long enough to reach
the surface of the water, allowing for tides.
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