Raymarine Autohelm 6000 User Manual page 17

broadly classified by length and hull type can vary
in steering characteristics. Selection
of the correct chain reduction ratio is not over
corrected during sea trials by an adjustment to
the gain control switch on the course computer.
Standard W' or W' pitch chain is recommended
for the chain drive and the drive sprocket ideally
should not have less than 15 teeth. Bore and
detailed in Fig. 19. It is essential that these bore
and keyway dimensions are strictly adhered to.
All sprockets must be keyed and grub screwed
to their shaft and finallv secured with 'Loctite'.
The drive unit is mounted by bolting to a
substantial frame member (Fig20)The mounting
foot is secured to the drive unit by four equally
screws and may be rotated
through 90" to provide a more convenient
mounting position if required (Fig. 21). In some
TYPE 2:
ROTARY DRIVE CHAIN
REDUCTION
D i s p l a c e m e n t
6 . 0
Fig. 17
RATIOS
C r a f t