Collapses; Stalls - Nova Bion 2 Manual

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The sink rates reached in the spiral may be between 10 m/s and 20 m/s.
These physical
demands can be
The force on the pilot's body can reach up to 3g and depending on the per-
simulated in a g-force
son's constitution, in extreme cases, this can lead to unconsciousness.
trainer. We recom-
mend such g-force
In conclusion: it is essential to practise this manoeuvre gently and in
training to all pilots.
stages. The exit must be controlled. Important safety information:
• if the pilot wishes to reduce the spiral or rotational movement, it is
recommended that the first action is to pull the outside brake, rather
than to release the inside brake;
• the pilot must be aware of the physical demands of rotation (vertigo)
and acceleration (g-forces).
• if the pilot weight-shifts to the inside of the rotation, the wing may
lock into the spiral;
• because of the fast descent rate, the pilot must constantly monitor
the height above ground and exit the spiral in good time.
Please note: if flown at the bottom of the weight-range, the spiral dive
must be executed with open trimmers in order to avoid the wing entering
a spin during the manoeuvre initiation.
C-line stall
We do not recommend a C-line stall with the BION 2.

Collapses

Asymmetric collapses
When flying into strong turbulence, one side of the paraglider may
collapse. This happens because the turbulence causes the angle
of attack on that side to decrease to the extent that lift is no longer
generated, the lines de-pressure and the wing collapses.
Such a collapse normally only affects a small part of the whole span
and the wing will not react significantly. During larger collapses which
affect 50 percent or more of the span, the wing will clearly react: due
to the increased drag of the collapsed side, the glider will begin to turn
towards that side. Simultaneously the wing will pitch forward becau-
se of the reduced area carrying the wing loading, i.e. because this
causes that side of the wing to accelerate. The pilot can prevent this
turn and forward pitch by braking the uncollapsed side of the wing.
Braking the uncollapsed side is essential, especially near the ground.
This manoeuvre should be practised with induced collapsed at height,
preferably during an SIV/pilotage course.
Frontal collapse
A frontal collapse is also a consequence of turbulence. Unlike an
asymmetric collapse, during a frontal collapse the whole leading edge
folds downwards.
All our paragliders open automatically after frontal, as well as asym-
metric collapses (as stipulated in the certification standards). To speed
up the re-inflation of the leading edge after a frontal collapse, we
recommend a very short stab of both brakes. It is important to then
release both brakes completely.

Stalls

Spin
If the pilot brakes one side of the glider too much, a spin will result.
In a conventional turn, the axis of rotation is remote from the wing.
When a wing spins, the axis of rotation moves within the wing span.
The over-braked side of the wing slides back.
The correct pilot reaction is to immediately release both brakes.
Occasionally it is necessary to stop the canopy pitching forward.
Full stall
If both brakes are symmetrically pulled too far, a full stall will result. This
means that the wing loses its forward momentum, whilst the pilot con-
tinues to travel forwards. From the pilot's perspective it feels like the
wing falls backwards. At this moment it is essential that the brakes are
not fully released as there is a risk that the wing will dive – potentially
underneath the pilot.
Please note: we recommend performing a full stall with the trimmers
closed. (See page 56)
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!
If the open side is
braked too much
the glider may spin
– see the section on
spins.
!
A full stall is a com-
plex manoeuvre and
an explanation of its
correct execution is
beyond the scope of
this manual. Anyone
wishing to learn this
manoeuvre should
undertake an SIV/
pilotage course.