GIN Boomerang 10 - Manual (Page 37)

37 /62 Boomerang 10
Line system, brakes and line plan
Line system
The Boomerang 10 has A and B line levels, which fork two or three times from the bottom (riser)
to the top (canopy) and which are divided into "Main", "Lower-Middle", "Higher-Middle" und
"Top" lines. The individual line levels are connected with one another using the “handshake knot”
(special hoop technology).
With the brake lines, the individual levels are bundled at the end with the main brake line. This
runs through the brake ring attached to the riser and is knotted at the brake loop of the control
handle. There is a mark on the main brake line which allows the control handle to be correctly
positioned.
The main lines are all attached to Maillon quick links. They are fed through special elastic rings
and attached to prevent the lines from slipping and to ensure that they sit in the correct
position.
Folding lines
Special folding lines were used when the Boomerang 10 was going through certification.
Without these folding lines, asymmetric and symmetric collapses (tucks and frontals) may not
behave or recover as they did in the CCC tests.
The folding lines have a special setting according to the CCC requirements. At the canopy, the
folding lines are attached to special loops at the test model. At the lower end, their three main
lines are attached to a special riser. Please contact Gin Gliders if you have any questions
regarding use of the folding lines and riser.
Brake line adjustment
Factory setting
The brake lines of the Boomerang 10 are set to the length that was used for the CCC certification
test flights. These line lengths have been finely tuned by the GIN test pilots, and it should not
be necessary to adjust them.
The brake line length is tuned so that there is slack in the brake lines when the glider is in fully
accelerated flight. Therefore, the brakes are quite slack at trim speed, and to take up that slack
in soaring flight, it is common to fly with half a wrap on the brakes and hold the handles on the
knot. However, care should be taken to release the wraps in any extreme situation.
If you do need to make adjustments to suit your harness, body and flying style, we strongly
recommend that you test fly the glider after every 2cm of adjustment. There should be a
minimum of 10cm of free brake travel when the glider is flown hands-off. This prevents the
brakes being applied unintentionally when the speed system is fully engaged. We recommend a
double sheepshank or a bowline knot for the brake handle attachment as shown in the diagram.