Use Of Speed Bar; Performance & Use Of Brakes; Asymmetric Or Frontal (Symmetric) Collapses - SKY PARAGLIDERS atis 4 Handbuch

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B-line Stall
Grasp the B risers at the quick links and pull them down symmetrically. the
paraglider will enter a B-line stall and drop backwards before stabilizing
overhead. the descent rate increases to 6 - 8 m/s. to exit the B-line stall
raise both hands together in a single, positive movement so that the risers
are at full extension. On releasing the B-risers, your atis 4 should return
immediately to normal flight. an adjustment error, control error or special
aerological conditions may lead to a prolonged stall phase. a push on the
speed bar should initiate rapid exit from the B-line stall. if the speed bar is
not connected, pulling on the a-risers by 4 – 5 cm will have the same result.
Caution: unlike big ears and spiral dives (see above) a glider in a B-line
is in a true stalled position. For this reason, a B-line stall should never be
performed close to the ground.
6) Performance & use of brakes
the atis 4 best glide is at trim speed (no brakes) – about 38 km/h. the
minimum sink rate is achieved by applying approx. 15% brake.
When using more than 30% brake the aerodynamics and the performance
of the glider deteriorate and the brake pressure rapidly increases.
With extremely high brake pressure there is a great risk of an impending stall
which occurs at full brake travel (100% brake). in normal flying conditions the
optimum brake position, in terms of performance and safety, is within the top
third of the braking range.

7) use of Speed bar

Your atis 4 is equipped with a speed system or accelerator. For fitting
and positioning of the speed bar consult the instructions provided by your
harness manufacturer. Before each take-off check that the speed bar works
freely and that the lines are long enough to prevent the speed bar from being
activated involuntarily in flight. if the harness is fitted with a front mounted
reserve the speed bar lines must pass under the reserve container and the
reserve bridle so that it can be deployed correctly. Use of the speed bar
increases the maximum speed of the paraglider by up to 30% of the trim
speed. However, it does reduce the angle of attack and therefore there is an
increased risk of a frontal (or asymmetric) collapse. For this reason we do not
advise use of the speed bar near to the ground or in turbulent air.
8) Asymmetric or Frontal (Symmetric)
Collapses
Despite tests showing that the atis 4 recovers spontaneously after
collapses, active piloting is recommended in the event of an asymmetric or
frontal collapse. active piloting will reduce the loss of altitude and a change
of direction.
In the event of a frontal (symmetric) collapse:
 Bring both brakes down symmetrically to speed up reopening of the
leading edge, then immediately bring your hands back up to normal flying
position.
In the event of an asymmetric collapse:
 Keep the paraglider flying straight by leaning away from the collapsed
side and applying sufficient brake to maintain course.
 speed up the reopening of the closed side by a single, positive input on
the collapsed side.