GIN Boomerang 10 - Manual (Page 24)

Boomerang 10 24 / 62
Deep stall (parachuting, stable stall)
The Boomerang 10 has no tendency to get into in a deep stall. Should this nevertheless occur,
make sure your brakes are fully released, the glider will then normally recover on its own
immediately. If the glider still doesn’t recover either put your hands on the A risers and push
forward or use the speed bar to accelerate the wing.
You can recognise a deep stall by the glider getting "mushy" and the airflow around your ears
decreasing. The glider may also compress spanwise. Flying in strong turbulence or exiting a
deflation with too much brake applied can cause this situation. A wet glider also has a higher
deep stall tendency, and you should do everything you can to avoid flying in the rain. If you do
pass through some rain apply speed bar until you are confident that the wing has dried out. An
out-of-trim glider, caused by changes in line lengths due to prolonged use, may also have a
higher deep stall tendency.
Full stall (dynamic stall)
The full stall happens when the wing partially deflates and loses its arched shape. It is
triggered when the maximum possible angle of attack is exceeded. The most common cause is
going below the minimum speed or flying near the minimum speed combined with the effects of
turbulence.
In full stall, the paraglider loses its forwards travel, surges backwards and deflates. If the
brakes are held down, the canopy comes up over the pilot again. The result is an almost vertical
descent with a sink rate of approx. 8m/s.
Because of the Boomerang 10’s high aspect ratio, during a stall the wing-tips tuck and move
behind the canopy. They return to their original position when the brakes are released. Slowly
release the brakes, making sure that this is done symmetrically. As soon as the glider is
completely open above the pilot, the brakes are released.
As this is done, the canopy accelerates forwards dynamically and picks up speed. Do not brake
too soon (otherwise it could go into a full stall again), and be careful to avoid a front stall by
making sure that it does not shoot too far forwards.
WARNING If the canopy has gone back during the full stall, the brakes must be held down,
otherwise the canopy may surge forward and, in an extreme case, end up
underneath the pilot. Hold the brakes down until the canopy is above you again.
Spin
The spin is a stable flight attitude, in which one side of the canopy stalls, while the other side
continues to fly forward. The glider turns around the stalled side of the wing.
In normal thermal flight, you are not very far from the limits of a spin. If a spin occurs, just let
up the brakes and wait for the glider to surge forward, checking it with the brakes if it surges
too far. Never release the spin if the glider is far back behind you, always try to release it when
the glider is above or in front of you!
If the spin does not stop, check whether you have released the brakes fully!