Windtech coral - Manual (Page 13)

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limit the sink rate of the canopy is approximately 10
m/s and the overload is equal to 2G's.
For bank angles higher than 60 degrees the
sink rate can achieve 20 m/s but the grea-
ter overload (G's) can cause eyesight and
equilibrium problems, and cause some
people to 'black out' (faint), which conse-
quently can make the manoeuvre extre-
mely dangerous.
To recover from a spiral dive, the inner
brake must be progressively and slowly rele-
ased, until the canopy assumes normal flight,
and angle of bank, again. A good rule of thumb is
to use the same number of 360-degree turns as you
did on entry on exit to give a safe and progressive pullout. If you release hands up from
a tight spiral dive you will experience a big surge followed by a dive. (In turbulent air
this can result in a collapse.) The CORAL has been tested for this but it is advisable to
learn the correct exit method, i.e. progressively release the inside brake.
> b stall
The B-line stall is a real stall even though the wing appears to be flying above your head.
During B-Stall, the canopy falls perpendicularly to the ground (straight down, but drif-
ting with the wind) at a sink rate of 5 to 12 m/s, with an angle of attack of 90 degrees.
To cause a B-Stall, it is necessary to sit upright in your harness, reach up with the bra-
kes still in your hands (preferably with the toggles around your wrists) & securely clutch
each B risers in each hand at the top near the Maillons Rapides (quick links). To enter the
B-line stall, pull down symmetrically on the B risers. (About 40 cm)
The force initially is quite hard (up to about 15cm) but for the last part the force requi-
red to pull down is less. Keep your weight centred in the harness, and keep the risers held
at a symmetric level to each other. The more B riser pulled the faster the decent rate, but
the glider can become unstable with a very deep B-line.
To return the glider to normal flight conditions:
Ease up the B-risers SYMMETRICALLY for 50% (25-cm of B-line still held) holding some
pressure, then symmetrically completely and rapidly release them. If necessary, control
the surging forward of the canopy by gently braking when the glider is in front of you.
What you are trying to achieve is to not shock-load the glider by an immediate release
from a deep B-line, whilst at the time not easing off too slowly and risking a deep stall
in turbulent conditions. Releasing the B-lines from a deep B-line position works fine (&
if unsure whilst attempting the manoeuvre simply release the B-lines together from this
position) but puts unnecessary load on the glider.