WINDVANE ATTACHMENT
The windvane allachment is
r~orrnaily
mounted
cenlrally
on lhe alter rail whefo
il
can be
silcd
in clear wind on
bolh
backs. The windvane mounling mast is
clamped lo lhe
allcr
rail by lhe Iwo ‘U’
bolls provided (Fig.
IO).
lho
inlerconnecling cable should be broughl
lhrough
Ihe slol lo
allorr
Ihe windvane
head lo be plugged
inlo
the lop
ol
lhe
mast
(Fig.
11).
The
interconnecling
cable
can
Ihen
be run back and plugged into
the
Aulohelm.
Alter Ihe vane head and mounting
masl instatlalion is complete the
windvane should be assembled and
secured by means
ot
Ihe circlip provided
(
(Fig 12) Care should be
laken
to
ensttIo
Ihat
the small circlip is corleclly localed in
Ihe
groove
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OPERATION
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I
BASIC PRINCIPLES
The lollowing descriplion
ol
Ihe
Autohelin’s
principle
01
operation will help
you lo make lull use
01
ils advanced
lealures.
The mosl apparenlol Ihese
leatures
is
Ihe absence
01
a compass dial and Ihe
addilion
01
e
six button keypad. Using
Ihe
powerlul
combinalion
01
microprocessor and ltuxgale compass, .
Ihe keypad provides aulolock course
seleclion and precise pushbutlon course
adjuslmenl. Once lhe pushrod is
connecled lo Ihe lilter Ihe currenl
heading as read
lrom
Ihe main steering
compass can be mainlained simply by
pushing lhc
Au10
bullon. Changes lo lhe
selecled
heading are made using the
lour course chanyo bullons.
Uevialion lrom the
scl
course is
continuously monitored by the
scrlsitive
Ituxgate compass and correclive
rudder
is applied lo relutn lho vessel to
course.
1 he applied tuddor is ploporlional lo
course erloi al any lime alld thus when
Ihe
course
is
reslored
Ihe rudder will be
neutralised.
When changes in vessel
Irirn
occur
duo lo varialions in wind pressure or
engine Ihrollle selling lhe course can
only be Inainlained by Ihe applicalion
01
permanenl rudder
oll.sel
(slanding helm)
lo
leslote
balance.
It
pelmanenl
tuddcr
oil-sol is nol applied lo teslore balance
Iho
vessel will boar on lo a
ne&
heading.
Under
llrese
circumslances lho
Autohclm dclecls thal Ihe original course
is nol being restored and conlinues lo
apply additional rudder
olhel
in Ihc
appropcialo direclion unll Ihe vessel
relurns
lo llie original heading. Aulomalic
Irimming capability
ensures
Ihal Ihe
originally
scl
course is held irrespcclive
ol
any changes in balance Ihal may
occur during
the
course
01
a passage.
Autoliolnis compirtcr also
conlinuously
monilo~s
Iho
pallern
01
applied rudder corroclion and can
dislinguish unnecessary iepclilive
correclions
caused by
pilch
and
1011
01
Itbe
vessel
ti0111
tt~oso
necessary to
maintain the selected heading. The
computer will aulomalically neglect all
unnecessary corrcclions so that nutopilot
aclivily and power consumption is
conlinuously optimised at minimum
levels.
The Idgh deyiee
01
conlrol aulomation
made possible by lhe micro computct
simptilies user control to a series
01
push
bullon operations.
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