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• At this point the wing will reach sink rates of 20 meters per second
(m/s) or more. The acceleration can be more than three times gravita-
tional force (>3g). The pilot must be aware of these forces.
Before learning to spiral, pilots should practise controlled exits from
steep turns. These exits are performed by using the outer brake, whilst
the inner brake initially remains in the same position. The outer brake
is pulled until the rotational movement slows. To achieve a smooth exit
without pitching forward, the outer brake must be released more as
soon as the wing starts to level, i.e. as soon as the wing is no longer
horizontal.
The actual spiral dive – as outlined above – only occurs after the above
described transition phase, i.e. the diving of the wing. At this moment
the pilot is pushed outwards in his harness. The pilot should release
the pressure to avoid the wing locking into the spiral.
Then the sink rate can be varied using the inner and outer brake.
If the pilot’s weight remains on the outside, releasing the inner brake is
sufficient to continuously slow the rotational movement of the glider.
To release the ears, release the A-lines fully and allow them to return to
their normal flying position. If the ears do not open automatically, the
pilot can use a quick, sharp tug on the brakes to assist the opening.
2) B-line stall
A B-line stall is instigated by symmetrically pulling both B-risers (ap-
proximately 15 centimetres). It is recommended – for maximum grip as
well as safely executing the manoeuvre – to grab the risers at the top.
i.e. at the maillon.
Immediately after pulling the risers, the wing will lose its forward speed
and after a short oscillation will descend in a stable parachutal stall.
When executing a B-line stall, we recommend watching your canopy –
whilst always keeping an eye on your height above ground, so that you
are able to exit the manoeuvre at the correct time.
The B-line stall is released by simultaneously raising your B-risers
back to their normal flying position. If they are released too slowly, an
unintended consequence can be a parachutal stall (see the section on
parachutal stall).
The brakes should remain in your hands the entire duration of the
manoeuvre and no additional wrap should be taken. When exiting the
B-line stall it is important that the brake is completely free so that the
wing can fully accelerate to trim speed.
3) Spiral dive
The spiral dive is the most demanding descent technique and should
be learned at great height, preferably during an SIV/pilotage course.
The manoeuvre has two phases:
• First the pilot weight-shifts into the turn and then uses the inner brake
to induce an ever tightening turn (note: do not jerk the brake, but pull
it smoothly and continuously). With increasing acceleration, there will
be a moment where the G-forces rapidly increase and the nose of the
glider begins to point to the ground until (during a successfully per-
formed spiral dive) the nose is nearly parallel with the ground.
These physical
demands can be
simulated in a g-force
trainer. We recom-
mend such g-force
training to all pilots.
!
Summary of Contents for prion 4
Page 1: ...Manual _DE _EN...
