13
B-Line Stall
Do not attempt B line stalls with Zero 3. If you need to lose altitude use big ears or a spiral dive instead.
Spiral Dives
If you turn your glider in a series of tightening 360’s it will enter a spiral dive. This will result in rapid
height loss. To initiate a spiral, first ensure the trimmers are in the pulled down, slow position. Then
look and lean in to the direction you want to go and smoothly pull down on the inside brake. The Zero
3 will first turn almost 360 degrees before it drops into the spiral depending on your input. Once in the
spiral you should re-centre your weight shift and apply a little outside brake to keep the outer wing tip
pressured and inflated.
Safe descent rates of more than 8m/s (1600 ft/min approx.) are possible in a spiral dive, but at these
rates the associated high speeds and G-forces can be disorientating. Always pay particular attention to
your altitude. To exit the spiral dive, ensure your weight shift is in a centred position and then smoothly
release the inside brake. As the Zero 3 decelerates allow it to continue to turn until enough energy is lost
for it to return to level flight without an excessive climb and surge.
The Zero 3 shows little tendency to remain neutral or unstable in a spiral dive; however some parameters
could affect its behaviour. These might include: chest strap setting too narrow, heavy loading, or being
in a very deep spiral at a very high sink rate >14m/s. You should always be prepared to pilot the wing out
of a spiral dive. To do so, smoothly use opposite weight shift and apply enough outside brake to stop
the wing from spiralling, if the wing continues to spiral, use more outside brake until the glider starts to
decelerate and resume normal flight. Never attempt to recover from a spiral with hard or quick opposite
inputs as this will result in an aggressive climb and surge.
IMPORTANT
Only ever initiate
spiral dives with
the trimmers set in
the slow position.
Spirals with open
trimmers increases the
likelihood of nuetrality
or instability.
IMPORTANT
Always be prepared
to pilot the wing out
of a spiral dive. Use
opposite weight shift
and apply enough
outside brake to
stop the wing from
spiralling.
Содержание Zero 3
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