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Icaro 2000
03/03/2022
10. Reflex and Dihedral
On your Alto the elements that provide its pitch stability are: the luff lines, the tips, fibreglass tips and the
wing profile. If the profile is modified, the wing requires a corresponding twist setting in order to restore
the glider's original stability characteristics. For this reason it is very important to check the profile
periodically, and/or after a crash.
Below we describe how to check your glider's reflex and dihedral. This should be done with the glider
completely set up.
There are 4 positions that should be checked:
Positions 1, 2 and 3 are the positions at which the reflex should be checked by measuring the
location of two specific battens with reference to the keel (see table below). The battens are
numbered from the keel outwards.
A
: This check (positions 1, 2, 3 and 4) must be done with full VG on, with the keel in a
TTENTION
horizontal position, and the side wires fully tensioned.
Position number 4 covers the outer section of the leading edge where the fibreglass tip is inserted;
here you check the glider's dihedral.
For each test, take a length of nylon fishing line, and stretch it tightly between the corresponding points
on each wing. Measure the vertical distance from the line to the top edge of the keel. In each case, the
measurement must be within the tolerances shown in the following tables:
Batten
Position 1
# 4
Position 2
# 5
Position 3
# 6
Position 4 LE Tube End
Batten
Position 1
# 3
Position 2
# 4
Position 3
# 5
Position 4 LE Tube End
Crossbar cable length that these measurements should refer to:
The above reflex measurements refer to very precise nose angles. For every different nose angle, the
wing should have a corresponding reflex. The maximum nose angle attainable with VG full on is
determined by the crossbar cable (running parallel to the crossbar). Therefore, the measurements given
above are only valid for the following crossbar cable measurements:
Alto – Owner Manual
Alto S
Height [mm]
Batten
+ 62
# 4
+ 74
# 5
- 12
# 6
- 47
LE Tube End
Alto L
Height [mm]
+ 76
+ 68
+ 54
- 104
Page #
Alto 2022-1-En
Alto M
Height [mm]
+ 146
+ 157
+ 121
- 135
21/48
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