GIN Boomerang 10 - Manual (Page 18)

Boomerang 10 18 / 62
If more brake is applied, the bank attitude increases and the glider will fly a fast turn increasing
in steepness, which will eventually become a spiral dive (further information on this is in the
section “Spiral Dive”).
Losing altitude
Extremely strong and widespread lift is found, for example, in storm conditions. The best place
to be in this situation is on the ground. Nevertheless, if you have been caught out by the
weather and find yourself needing to descend rapidly, there are several ways to do so. The best
way is, of course, to find sink. Failing that, try one of the techniques below. Most of these
techniques place undue stress on your glider, and should be avoided if you want to extend its
lifetime. We recommend you initially practice these manoeuvres under qualified supervision
during a safety training course.
Big ears
It is possible to do big ears on the Boomerang 10, but it takes great arm strength to hold in the
ears and the glider loses structure when the ears are in. Therefore the maneuver is not
recommended.
B3-Descent
To increase your sink rate, first apply a little speed bar (about 25%) and then pull in the (outer)
B3 lines simultaneously, firmly and progressively. To exit the manoeuvre, release the tips
simultaneously and progressively and then release the speedbar.
B-Stall
This manoeuvre is not possible with the Boomerang 10. For fast descent use a steep spiral or
B3-Descent as described above.
Spiral dive
The spiral dive is an extreme manoeuvre. Practice spiralling with caution and lower sink rates to
get a feeling for the Boomerang 10’s behaviour. Weight shift and pull the brake on one side
gradually. Let it accelerate for two turns and you will enter the spiral dive. Once in the spiral,
you can control your descent rate and bank angle with weight shift and the outer brake. Spiral
dives induce large G forces, and these can disorient the pilot and stretch the glider lines and
sail.
The outer wing tip may collapse during the spiral dive although this is no cause for concern. It
can be avoided by lightly braking on the outside. Release the brakes carefully.
WARNING A pilot who is dehydrated and/or not accustomed to spiralling can lose
consciousness in a steep spiral dive! As with all types of aircraft, we advise you to
assist the glider to exit from the spiral dive in a controlled manner.
To allow the glider to exit from a spiral dive, your position in the harness must either be neutral,
or even better, on the opposite site of the turn while spiralling. If you release the inner brake
the wing will normally exit the spiral dive by itself. The Boomerang 10 has no tendency to stay
in a stable spiral, but nevertheless, you should know how to exit from a stable spiral: