Air Creation BioniX2 13, Maintenance Manual

Page: 40 / 50

GDMMBi²13-1G Version 0010 40
Tension of the sail on the last carbon battens of the wing tips.
It is easy to adjust the symmetry of the wing by differentially adjusting the tension of the
sail on the last carbon batten wing tips. To do this, simply rotate the plastic tip of the
batten (
batten screw P235015
) which is fitted with a thread. The standard setting is 3
revolutions (counterclockwise) of the batten tip in relation to its maximum screwed
position
.
Increased tension raises the trailing edge of the wing tip under consideration and
reduces its lift. Decreased tension has the opposite effect. Action should be taken in small
corrections (1 turn on the tip batten) and simultaneously applied in opposite directions on
each side (+1 turn right, -1 turn left, for example). Check the results and increase the
adjustment if necessary.
Symmetric tuning of the tension of the sail on the last carbon wing tip batten leads to a
change in hands-off cruising speed. Increasing tension leads to a slowdown, reducing it
leads to a speedup. The maximum tension allowed is obtained with 6 turns of tension on
the batten tip.
Tension of the sail on the removable battens of the upper surface
The tension of the sail on the upper surface battens may be modified to counteract the
effects of aging sail, and improve its performance. This action is not to be considered
before a minimum of 300 hours of flight. To adjust the tension, simply rotate
counterclockwise the plastic tips of each batten. A retensioning of 2 turns generally
provides the desired effect. The cruising speed with the CORSET relaxed or tense will be
increased by about 1 km/h per tensioning turn but handling in roll will be slightly
reduced.
Pivoting sleeves at the end of leading edges
The swivel sleeves were preset during the first factory tests of the wing, according to the
torque of the trike’s engine, and they are locked in position by a Parker screw. This
position can be checked by means of the positioning mark on the sleeve, which
corresponds to a mark (0, +2.5, +5, -2.5, -5) on the scale stuck on the end of the tube. A
further correction is possible if the modification of the tension of the last carbon batten
wing tips described in the preceding paragraph has not lead to the desired trimming (in
case of adaptation to a trike equipped with an engine whose torque is different, for
example). Their differential rotation can be used to correct an asymmetry of the wing.
The result is comparable to that of the ailerons on a conventional aircraft - lower the
trailing edge produces more lift and raising it produces less.
For a wing with a left tendency, dismount the tip fins and the last straight battens of the
wing tip, open the Velcro bindings of the lower surface to the upper surface at this level,
and remove the self-tapping screws placed on the inside of the leading edge. Turn each
sleeve clockwise to achieve the next values (+2.5 on the right, -2.5 on the left) by forcing
on the fabric. After the adjustment, reassemble the screws, the battens, the tip fins and the
Velcro. If the correction is insufficient for a perfect tuning of the wing, repeat the process
until you reach the correct adjustment (maximum allowed: 10 mm difference right/left).
Always rotate to the same value the sleeves of each half of the wing. For effective flight
operation do not change the tension of the sail on the last carbon wing tip batten.
If the wing has a right tendency, the left sleeve should be rotated by 2.5 mm
counterclockwise (towards +), and the right sleeve by the same value in the opposite
direction, 2.5 mm clockwise (towards -).
Pivoting the sleeves can also be used to fine tune the cruising speed with the CORSET
tensed or relaxed. A joint rotation of the two sleeves of 2.5 mm upwards (towards +)