25
Note
: when the vane is in operation, only the segment of control lines between
the two quadrants (or vane quadrant and aux. tiller) moves and therefore, needs to be
led through blocks. The segment between the rudder quadrant (or tiller) and the
jamming cleats does not move, it is only kept in tension and can be led through
fairleads instead of blocks.
Position of the Turning Blocks
The ideal ratio between the tilt angle of the pe quadrant, and the
rudder angle is 2 : 1 (for 10° of pe quadrant tilt, 5 ° rudder angle). Since the
turning block on the rudder quadrant (or tiller) divides the travel by half (and doubles
the force), the
distance between
this
block and
the
rudder axis
should be
equal to
the
windvane
quadrant radius
: 8 in. (20 cm) for
Jean-du-Sud
and 10.1/2 in (27 mm)
for
Spray
.
Most wheel failures requiring use of an emergency tiller are caused by breakage
of a steering cable. If the above method of connection is used, the vane will still steer,
should a cable break.
.
