NIVIUK GLIDERS IKUMA 21, Руководство пользователя

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provoke the re-opening. Take care not to over-brake on the side that is
still flying (turn control) and when the collapse has been solved; remember
to let the wing recover its flying speed.
Symmetric collapse
In normal flying conditions the design of the IKUMA ensures that a
symmetric collapse is quite improbable. The profile of the wing has been
designed to widely tolerate extreme changes in the angle of incidence. A
symmetric collapse may occur in heavy turbulent conditions, on entry or
exit of strong thermals or lack of adapting the use of the accelerator to the
prevailing air conditions. Symmetrical collapses usually re-inflate without
the glider turning but you can symmetrically apply the brake lines with
a quick deep pump to quicken the re-inflation. Release the brake lines
immediately to recover optimum flight speed.
Negative spin
This configuration is out of the normal flight behavior of the IKUMA.
Certain circumstances however, may provoke this configuration such
as trying to turn when the wing is flying at very low speed (while heavily
braking). It is not easy to give any recommendations about this situation
since it varies depending on the circumstances. Remember that you
should restore the relative air speed over the wing. To achieve this,
progressively reduce the pressure on the brake lines and let the wing gain
speed. The normal reaction would be a lateral surge with a turn tendency
no greater than 360º before restoring to normal flight conditions.
Parachutal stall
If it does happen, the feeling would be that the wing would not be
advancing; you would feel a kind of instability and a lack of pressure
on the brake lines, although the canopy would appear to be correctly
inflated. The correct reaction would be to release the pressure on the
brake lines and push the A lines forward or rather lean your body to any
side WITHOUT PULLING ON THE BRAKE LINES.
Deep stall
The possibility of the IKUMA falling into this configuration during normal
flight is very unlikely. This could happen if you are flying at a very low
speed, whilst over steering in a number of maneuvers and in turbulent
conditions. To provoke a deep stall you have to take the wing to minimum
flight speed by symmetrically pulling the brake lines, when you reach this
point, continue pulling until you reach 100% and then hold. The glider
will first fall behind you and then situate itself above you, rocking slightly,
depending on how the maneuver was carried out. When you start to
provoke a stall, be positive and do not doubt an instant. Do not release
the brake lines when half way through the maneuver. This would cause
the glider to surge violently forward with great energy and may result
in the wing below the pilot. It is very important that the pressure on the
brake lines is maintained until the wing is well established vertical above.
To regain normal flight conditions, progressively and symmetrically
release the brake lines, letting the speed be re-established. When the
wing reaches the maximum advanced position ensure that the brakes
are fully released. The wing will now surge forward, this is necessary so
that air speed is completely restored over the wing. Do not over brake
at this point because the wing needs to recover speed to quit the stall
configuration. If you have to control a possible symmetrical front stall,
briefly and symmetrically pull on the brake lines and let go even when the
wing is still ahead of you.
Wing tangle
A wing tangle may happen after an asymmetric collapse, the end of the
wing is trapped between the lines (Cravat). This situation could rapidly
cause the wing to turn, although it depends on the nature of the tangle.
The correction maneuvers are the same as those applied in the case of an
asymmetrical collapse, control the turn tendency by applying the opposite
brake and lean your body against the turn. Then locate the line that