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Nano 4 user manual
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Symmetric collapses (Front stall)
A negative angle of attack can also cause part or all of the leading edge of the glider to
collapse.
Symmetric (frontal) collapses will normally re-open without pilot input. The speedrider will
pitch forward and then regain speed. Assist this process if necessary with a symmetric
application of the brakes. Take care not to apply too much brake for too long as this may stall
the wing.
In the case of extreme front stalls across the entire wing chord, the wing tips may move
forward making the glider form a U-shape. Again, recovery is by light symmetrical braking on
both sides. Take care that both wingtips return to normal flight evenly.
WARNING: If you get a collapse while in accelerated flight, close the trimmers
immediately. Then apply the normal procedure for unaccelerated symmetric collapses.
Types of stall
When a speedriding glider flies through the air, a laminar and turbulent boundary layer is
created. Extremely dangerous flight configurations can result if the laminar boundary layer is
interrupted, with practically the entire airflow along the top surface breaking away. This
happens in particular when the angle of attack is too great.
WARNING: Full stall and spin are manoeuvres which can be fatal if recovery is not correct.
These manoeuvres should therefore be avoided. However, it is important to learn how to
recognise the indications that a glider is about to stall so that you can take immediate
action to prevent it.
There are three different types of stall in paragliding.
Deep stall (parachuting, stable stall)
Speedriding gliders can go into a deep stall for a variety of reasons: brake lines too short (no
slack), old or damaged glider material which therefore has increased level of permeability,
altered trim/line length and changes to profile characteristics caused by moisture (e.g. flying in
rain).. An out-of-trim glider, caused by changes in line lengths due to prolonged use, may also
have a higher deep stall tendency.
In a deep stall, the airflow from the front reduces and the glider goes into a stable flight
attitude without forward momentum. The speedrider sinks almost vertically at high speed and
there is noticeably less flight noise.
The Nano 4 has no tendency to get into in a deep stall. Should this nevertheless occur,
make sure your brakes are fully released, the glider will then normally recover on its own
immediately. If the glider still doesn’t recover either put your hands on the A risers and push
forward.
You can also open the trimmers to accelerate, so that the glider goes into a normal flying
position from the deep stall. After you have landed, the glider and the length of the lines must
be checked.
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