Air Creation FUN 14 Instructie- en onderhoudshandboek - Pagina 7

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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.

Instruction and Maintenance Handbook FUN 14

Tél. : 33 (0) 4 75 93 66 66 - Fax : 33 (0) 4 75 35 04 03 - Internet : www.aircreation.fr

AIR CREATION Aérodrome de Lanas - 07200 AUBENAS - France

EDITION : APRIL 2002

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