Advance acoustic XI 21, Manual

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rip the cell walls and damage the leading edge.
Handle with care: After landing in water the canopy can quick-
ly fill up, and become very heavy. The canopy should be lifted
out of the water by its trailing edge, giving the water a chance to
run out . Otherwise it might tear under this unaccustomed hea-
vy load.
Flying with a wet paraglider (risk of deep stall)
Flying with a wet glider creates a risk of deep stall. Deep stall is of-
ten the result of a combination of factors. The weight of the wet can-
opy goes up, and this increased weight increases the angle of attack,
which always puts the glider nearer the deep stall limit. Added to this,
water drops on the top surface have a detrimental effect on the laminar
flow of the boundary layer near the leading edge, which distinctly re-
duces the maximum lift coefficient. If the wet glider is also being flown
at its lower weight limit there is a further small effect of increasing the
angle of attack, as well as there being a lower airspeed because of the
reduced wing loading.
In order to avoid the risk of deep stall with a wet glider, the wing should
be braked as little as possible, and big ears not used at all. As a further
preventative measure apply moderate (25-40%) speed bar. These ac-
tions have a small effect in reducing the angle of attack. If the wet glid-
er does go into deep stall you should recover by using the speed bar
only. See also section “Deep stall“.
Winching
The XI is suitable for winch launching. When taking off in windless
conditions, ensure that the paraglider is laid out in an arched or even
wedge shape ( to avoid risk of the glider rosetting ):
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