B-Line Stall; Spiral Dive; Speed System - BGD Tala Manuel D'utilisation

B-Line Stall

This is a fast descent method and is a useful emergency procedure. With both hands through the brake handles,
the pilot takes hold of the top of the B risers, one in each hand, and pulls them down by around 50 cm. This will
stall the canopy and forward speed will drop to zero. Make sure you have plenty of ground clearance because
the decent rate can be over 10 m/sec. To increase the descent rate pull harder on the B riser. When you release
the B riser the canopy will automatically start flying again, normally within two seconds. Sometimes the canopy
will turn gently when it exits from the B line stall. It is normally better to release the B riser fairly quickly rather
than slowly as this may result in the canopy entering deep stall. Always release the riser symmetrically as an
asymmetric release from a B line stall may result in the glider entering a spin. This maneuver is useful when
losing a lot of height quickly is necessary, perhaps when escaping from a thunderstorm. It should not be
performed with less than 100 m of ground clearance. (see also Chapter V).

Spiral Dive

A normal turn can be converted into a strong spiral dive by continuing to apply one brake. The bank angle and
speed of the turn will increase as the downward spiral is continued. Be careful to enter the spiral gradually as too
quick a brake application can cause a spin or enter an 'over the nose' spiral.
BGD gliders are designed and tested to recover from normal spirals with a descent rate inferior to 16 m/sec,
automatically without pilot input. If the pilot increases the descent rate of the spiral to over 16 m/sec or initiates
what is known as an 'over the nose' spiral, the glider may require pilot input to recover. In this case all the pilot
needs to do is to apply some outside brake and steer the glider out of the turn.
The ''over the nose' spiral is a special type of spiral dive where the glider points almost directly at the ground.
Making a sudden brake application during the spiral entry so that the glider yaws around enters this, and the
nose of the glider ends up pointing at the ground, after this the glider picks up speed very quickly. This technique
is very similar to SAT entry technique, and like the SAT it is an aerobatic maneuver, which is outside the normal
safe flight envelope. Please do not practice these maneuvers as they can be dangerous. Care should be taken
when exiting from any spiral dive. To pull out of a steep spiral dive release the applied brake gradually, or apply
opposite brake gradually. A sharp release of the brake can cause the glider to surge and dive as the wing
converts speed to lift. Always be ready to damp out any potential dive with the brakes. Also be ready to
encounter turbulence when you exit from a spiral because you may fly though your own wake turbulence, which
can cause a collapse.
CAUTION:
SPIRAL DIVES CAN CAUSE LOSS OF ORIENTATION ("black out") AND SOME TIME IS NEEDED TO EXIT
THIS MANOUVER. THIS MANOUVER MUST BE EXITED IN TIME AND IN SUFFICIENT HEIGHT!

Speed System

The TALA is sold with accelerator risers and a speed stirrup as standard but can be flown without the speed
stirrup attached.
Launching and general flying is normally done without using the accelerator. The accelerator bar should be used
when higher speed is important. A 70 kg pilot on the TALA – medium size should be able to reach a speed of
over 55 kmh using the accelerator system. Glide angle is not as good in this format, so it is not necessarily the
best way to race in thermic conditions and the canopy is slightly more susceptible to deflations. Using the stirrup
can require some effort and the pilot´s balance in the harness can be affected. It may be necessary to make
some adjustments to the harness. We recommend that only fly in conditions where you can penetrate with the
risers level so that you have the extra airspeed should you need it.
To fly at maximum speed the stirrup should be applied gradually until the upper pulley on the A riser butts against
the pulley at the riser base.
The accelerator system is designed to give maximum speed when the pullies of the accelerator touch each
other. Please do not go beyond this point by using excessive force to attempt to make the glider go faster as this
may result in the glider collapsing.
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Rev_04_25.01.2013 Bruce Goldsmith Design GmbH, Hügelweg 12, 9400 Wolfsberg, Austria,