Airdesign UFO 2 Betriebshandbuch Seite 54

After pre-filling the glider stabilizes its movements, and the brakes can be leased until the
glider recovers speed and flies again.
Only release the glider when it's in front or over head – never when the glider sits back of the
pilot.
The speciality of the UFO:
The full-stall as well the deep-stall differs a little to conventional gliders. At the full-stall
the glider can rock further back as used to be (especially on smaller sizes).
Once releasing, the UFO 2 wants to fly instantly – the wing is probably flying before you
try to do the pre-filling sequence.
ATTENTION: The full stall requires a lot of height and demands certain skills to recover. It is
important this manoeuvre is not practiced without qualified supervision.
It should preferably be practiced during a safety training course.
The deep stall, or parachutal stall is kind of the pre-stage to a full stall. The wing has no
forward motion and a high sink speed, but it is almost fully inflated. The pilot can enter the
deep stall by applying both brakes. It is very difficult to keep the wing in a deep stall: If you pull
the brakes a little too much, the glider will enter a Full Stall. If you release the brakes too much,
the glider will go back to normal flight. To practice a deep stall, it is necessary to master the full
stall first.
A very old or worn out glider with a porous cloth or with a changed trim (due to many winch
launches, or deep spirals) might stay in a deep stall even after releasing both brakes. Do not
apply the brakes in such a situation, because the wing would then enter a full stall! You can exit
the deep stall by pushing the speed bar, or by simply pushing the A-Risers forward. If you fly
through rain, the risk of a deep stall is higher.
The speciality of the UFO:
Compared to conventional gliders the UFO 2 exits deep-stalls instantly and without delay.
It does not show a deep-stall tendency at all.
We advise against flying in rainy conditions. Normally the UFO 2 does not show a tendency for
a deep stall. If it happens that you get into rainfall, we recommend not to perform a B-stall or
Big Ears. The best is to leave the rain as soon as possible, and to fly with both brakes released,
or even accelerated, as this reduces the risk of a deep stall. (The available brake travel before
entering a deep stall may be reduced significantly.)
If a deep stall should happen release it according to instructions above.
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