14
1 : a) Position the Gear
It is the mounting tube that
passes through the transom, and
through which pivots the horizontal
axis between the servo-pendulum
and the quadrant, which
determines the position of the
gear. Hence, positioning the
mounting tube is positioning the
entire gear.
The mounting tube
should be in a line parallel to
the fore-and-aft centreline of the
boat (the keel)
However, it can be mounted
off-centre
, in order to avoid
cutting or moving the backstay
chainplate gusset. Performance of
the gear will not be affected if it is
offset to one side (provided it is
kept parallel to the keel).
It can even be offset enough to
allow a transom-mounted rudder to pivot.
Height Above Water
Drag of the servo-
pendulum is kept to a minimum
when the metal plate that links the
servo-pendulum to its stock is
kept out of the water. Therefore,
the height of the mounting tube
above the waterline (HWL) should
be at least
16 in. (40 cm) for the
Jean-du-
Sud
24 in. (60 cm) for the
Spray.
If the gear is higher, we can make
the servo-pendulum stock longer,
conversely, if it is lower.
