Gin Boomerang12, User Manual, Page: 23 / 46

Boomerang 12 user manual
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Canopy Collapses
Asymmetric collapses are caused by the stagnation point moving to the trailing edge of the glider. A
negative angle of attack makes part of the canopy collapse and tuck under, and the glider may plunge
down, turn away or spin.
Use active fl ying techniques to virtually eliminate collapses in normal fl ying conditions. Nevertheless,
if you do get a collapse, stabilize your weight in your harness and do not allow yourself to fall to the
collapsed side. Control your course with weight-shift and a little outside brake. The de
fl ation should
re-in fl ate spontaneously.
If the de fl ation does not re-in fl ate spontaneously, apply brake on the closed side in a smooth,
progressive pumping action. Be sure not to apply too much brake too slowly as this may risk a stall.
Remember that a partly collapsed wing has a reduced surface area and thus a higher stall speed.
If you get a collapse while in accelerated fl ight, release the speed bar immediately. Then apply the
normal procedure for unaccelerated asymmetric collapses.
A cravatte occurs when a wing tip becomes stuck between the glider lines, for example, following a
bad take-off preparation. On the Boomerang 12, a cravatte is unlikely to occur. If you do get a cravatte,
fi rst control your direction. Do this by using weight-shift and enough counter-brake to stop the turn,
but not too much to risk a stall of the opposite side.
A cravat can generally be opened by a short, fast pull on the brake line of the cravatted side. If not,
on the Boomerang 12, there is a separate stabilo main line that goes down to the riser. This line
usually becomes slack in the event of a cravat. Pull this line down completely until it becomes tight
and the cravat normally comes out.
Grabbing the stabilo main line
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