Full-Stall - Deep Stall - Airdesign UFO 2 Betriebshandbuch

As the glider surges forward slow it down with the brakes to avoid the possibility of an
asymmetric collapse. Always wait for the glider to be in front of you or above you when
releasing a fully deployed spin - never release the spin while the wing is behind you because
the glider would dive very far in front of you or even underneath.
m. Full-stall – Deep/Parachutal Stall
For the UFO 2 16 is the minimum range of brake travel 60 cm.
These numbers are the minimum requirements for the EN-norm.
The speciality of the UFO:
At the main-brake line is a ball attached which pulls down the C-riser short before the
stall-point. This increases the brake pressure short before the stalling – actually, this is a
good indicator for feeling how deep you pull the brakes. You should not hold the brakes
at this position static as the glider might go into a deep- or full-stall.
Pumping the brakes wing beyond this point is no problem. Also doing a dynamic move
when landing is no problem.
The available brake travel before stalling the wing depends on the size. Those numbers are
just a rough indication. (This publication of the brake travel is claimed by the EN 926-2.)
It would be dangerous to use the brake travel according to those numbers, because it is not
practicable to measure the brake travel during flight, and in turbulences the stall might occur
with less brake travel. If you want to use the whole brake travel of your glider safely, it is
necessary to do intended spins and full stalls to get a feeling for the stall behaviour –
preferable during a safety training course.
NOTE:
IN GENERAL, THE BRAKE TRAVEL BECOMES SHORTER DURING A SIDE COLLAPSE (WHEN TRYING
TO STABILIZE ON THE OPEN SIDE)!
This is an extreme manoeuvre that should rarely, if ever, be required.
To induce a full stall, pull both brake-lines down smoothly. Hold them down, locking your arms
under your seat until the canopy falls behind you and deforms into a characteristic crescent
shape. In spite of how uncomfortable it may feel as the glider falls backwards, be careful not to
release the brakes prematurely or asymmetrically. If the brakes are released while the glider is
falling backwards the surge and dive forwards is very fast and the glider may shoot in front and
even underneath you.
In a full stall the canopy will oscillate back and forth. To stabilise this, the pilot can release the
brakes slowly and for approximately 1/3 of the brake travel and then hold at this level. Holding
at this position allows the wing to refill slightly across the span. When releasing the brakes
without pre-filling the ears mostly will most probably hook in the lines and this can result in a
cravat.
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