Instruction and Maintenance Handbook
FUN 14
EDITION
:
APRIL 2002
PAGE
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7
AIR CREATION
Aérodrome de Lanas - 07200 AUBENAS - France
Tél. : 33 (0) 4 75 93 66 66 - Fax : 33 (0) 4 75 35 04 03 - Internet : www.aircreation.fr
d)
Adjustments
Hang point position
Centering adjustment is done by moving the hang point on the keel. The nylon locking rings of this part should be
positioned according to the desired centering (3 positions). The cruising speed at natural trim increased by about 2
km/h if the hang point is moved forward and vice versa. Each position may be used, the only effect is alteration of
the cruising speed once control has been released, without any repercussions on stability and performance.
However, the hang point should never be brought back to its most backward point on the keel, if the total added
load exceeds 170 kg. The cruising speed thus obtained would be too close to the stalling speed of the wing, which
would make piloting delicate. During the first flights, centering should be left it its original position.
Warning : Any alteration of centering means a variation of the 'A' frame tilt and therefore modification of the lower
longitudinal cables tension. There are various adjustment holes in the cable fixation rail in the nose of the wing, so
as to allow them to keep a correct tension whichever the adopted position of the swan nose catch may be.
Position of the tip adjusters at the leading edges tips
The two bolts of the tips adjusters have originally been designed to be in line with the tip struts. Their differential
pivoting should only be used for rectifying a tendency to pull to the side. Once adjustment has been made, mark
with a felt-tip pen the leading edge link with the sleeve or secure it with a pop rivet in order to find the correct
position again at each assembling. If the wing pulls to the right, turn the left wing sleeve anticlockwise in order to
increase the twist, and the right wing sleeve anticlockwise too, in order to decrease the twist. For a wing pulling to
the left, turn the two sleeves in a clockwise direction.. Should the correction not be enough for a perfect wing
adjustment, tension the sail as indicated in the next section.
Sail tension
The sail tension at the wing tip may be altered to rectify dissymetry observed during flying, or to make up for wear
of the sails. To perform this adjustment, remove the protecting cap from the wing tips and rotate the bolt placed at
its end with a number 10 spanner. Put the cap back and readjust if necessary the tension of the small ropes or
rubbers of the bottom and upper surface of the last wing tip batten, because of the modifications of the sail position
on the leading edges tubes.
•
In order to rectify the tendency to pull to one side, tighten the bolt on the leading edge of the "upward" half-sail
and loosen the bolt of the "downward" half-sail, if it is not at its minimum tension adjustment already. Do two
and a half turns at the utmost (2.5mm tension) on each half-sail, then test the aircraft. Repeat the operation until
the wing is perfectly adjusted.
•
To keep the original tension of the sails which slacken by use, it is necessary to draw the sail symmetrically
tight again on the two leading edges. The first adjustment should take place after 50 hours of use. A
retensioning of 5 mm (5 turns) would be necessary to keep the original characteristics of the wing. The
following adjustments are to be carried out during the periodical overhauls. As a general rule, tension increase
on the leading edges means an increase in aerodynamic performance and in pitch stability of the wing. The roll
rate, on the other hand, is altered by this operation.
