Dudek Colt 23 S, User Manual

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Spiral
B-Stall
RAPID DESCENTS
Big Ears
You can deflate both wingtips simultaneously pulling down the A' risers (blue
ribbon) by approximately 50 cm.
It is important not to let off the brake toggles while entering the Big Ears
manoeuvre.
When folded, paraglider will maintain straight course with an increased sink
rate (up to 5 m/sec). The canopy remains controllable with weight shifting.
On releasing the A' risers canopy usually reinflates spontaneously, or can be
aided by a long pump until the tips get clear.
Due to possibility of entering parachutal stall it is advisable to apply
speedbar after folding the wingtips, in order to diminish AoA.
CAUTION: See PARACHUTAL STALL section.
It is characterized by high sink rate. Significant G-forces, however, make it
difficult to sustain a spiral for long, as it can place high loads on the pilot and
glider. Never do this manoeuvre in turbulence or at too high bank angles.
You have to watch constantly the situation, in order to prevent your spiral
from turning into a spiral dive (sink rate over 16 m/s). If the pilot releases
inner brake and the wing does not start slowing down, he should assist this
process with the outer brake.
NEVER DO BIG EARS IN A SPIRAL! Tests have proven that loads in
spiral dive can be even higher than those used in certification tests (i.e.
8 G). This can result in structural failure of the glider, as smaller
number of lines is taking these high loads.
To enter a B-stall you have to simultaneously pull both B-risers (red) down by
10 - 15 cm. The wing collapses on its entire span along B-row, the airflow
over the top surface will break and the canopy projected surface will be
significantly reduced. Forward speed will die and you will be descending
almost vertically.
Further pulling of the B-risers is not advised, as the wing instability can grow.
If the canopy forms a horseshoe with the wingtips in front of you, gently
apply both brakes to recover.
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USER MANUAL