Perche Vmax Large, Xlarge, Owner'S Manual

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13

!"#$"%&'!(#()*+,+-)

12.4 Dynamic Interruption of Flow - Special Case of Full Stall

Cause:

Sudden pulling of both steering lines from full speed to inter-

ruption of flow.

Outcome:

The flying speed decreases abruptly to zero. The pilot swings

forward due to inertia. A strong angle increasing follows on the profile, which
leads to stall. If the pilot suddenly lets both steering lines go shortly after
interruption of flow (e.g. out of fear), his entire weight increases the swinging
even further. The canopy can then rush far forward, even until it comes
under the pilot (the most unfavorable case).
Measures:

Under no circumstances let the controll lines go shortly after

interruption of the flow. Stall the glide until the canopy is stabilized over the
pilot. Returning to the position as described in para 12.3.

12.5 Parachutage

The biggest danger of parachutage exists when the glider flies too slowly in
turbulence. The consequence of the low speed the air stream disappears on
the upper side of the canopy. The glider has no forward speed, you cannot
hear any flying sounds. As the canopy remains completely open, it is rela-
tively hard to establish this form of flying . In order to bring the glider back
into position it is enough to release the brakes again.
In case the parachutage is not completed, brake shortly both steering lines
in order to achieve a slight tipping over of the canopy. Release both steering
lines again and the canopy resumes flight.
If the tendency of parachutage becomes more frequent as the paraglider
becomes older it is necessary to check trimming and permeability to air of
the fabric.

12.6 One-Sided Interruption of Flow - Negative Spiral

A negative spiral emerges mostly during too slow thermic circling. If you
increasingly apply brakes during the thermic circling in order to achieve bet-
ter curve sinking, the flow comes to an abrupt end on the inner side of the
curve at app. 80% / 100% of the controll lines position (e.g. left / right).
The result is a fast spiral almost without a radius, with very small transverse
incline. This flying style must under no circumstances be carried out on pur-
pose! It is not possible to control it and it is very dangerous: it can cause
screwing in of the pilot or piercing of the glider parts by the lines.
In order to bring the glider back in position, you must definitely firstly stop the
rotation, which is achieved by bringing the controll lines to 70-80% on both
sides. Light counter-steering stops it more quickly. Only after you have stopped