Advance acoustic SIGMA 11, Manual

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Caution: Even though the SIGMA 11 has a high degree of stabi-
lity in accelerated flight you should only use as much speedbar
as you feel comfortable with .
Info: Although flying into a headwind (15-20 km/h) gives you the
feeling that your gliding performance is being badly affected,
bear in mind that strong sink (more than 2 m/s) has a relatively
stronger adverse affect .
Setting up the speed system
The Speed Performance Indicator (SPI) gives you an indication of the
relationship between your accelerate range and your wing’s polar cur-
ve, and it also indicates whether your speedbar/loop application is
symmetrical . It also helps you set up your speed system . Set the length
of your speed lines so that you can use the full travel of the speed sys-
tem, and that the red indicator shows 100% when the second rung of
the speedbar/loop is fully extended . This setting should arrange that
the first rung reaches approximately the 50% position .
The SIGMA 11 speed system is arranged so that the profile shape of
the wing is fully retained over the angle-of-attack range of the speed
system . This maintains the beneficial qualities of the profile at high
speeds .
Caution: The speed system is correctly adjusted when you can
use the full travel available on the risers . Make certain that the
speed lines are not set too short, thus causing the wing to be
pre-accelerated all the time!
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