Operation Manual

Flap  Flaperon Mixer Spoiler  Aileron Mixer
(access via Set-Up Menu) (access via Set-Up Menu)
48 Fixed Wing Models
FLAP  FLAPERON
MIXER
Butterfly Function as a
Landing Aid
Codes 17 … 19
SPOILER 
FLAPERON MIXER
For models with a V-tail the functions of elevator and
rudder must be mixed so with one another so that
during elevator movement both surfaces are moved
up or down in the same direction, and during rudder
control the surfaces move in opposite directions , i.e.
one surface upward and the other downward. The
"VTL" Program contains the appropriate mixer, to
control surfaces connected to separate servos. The
function is activated using the INC / DEC buttons.
Servos connected to outputs 3 and 4 of the receiver
are automatically coupled with one another. The mix
relationship is changed using the dual- rate setting,
see page 20, where Ch4 changes the rudder effect
and Ch3 the elevator effect.
The Butterfly function serves to increase the gliding
angle as a landing aid; it can be used alone or
additionally with existing airbrakes or spoilers.
The flight programme "Fb" contains finished mixers.
Code 17 drives both ailerons downward with
movement of the throttle/spoiler control stick so they
act as flaperons. Code 19 drives them in the
opposite direction so that they form Butterfly (or
Crow) brakes. Code 18 allows the elevator to be
trimmed with application of brakes to retain the same
pitch trim. Each of these three mixers can be
adjusted individually; and of course they can also be
used individually.
So, for example, the spoiler  elevator mixer, code
18, can be used in combination with normal
airbrakes in order to maintain pitch trim when the
airbrakes are deployed. The other two mixers would
have the mix proportion set to 0%, so that they
remain ineffective.
With ailerons that are full span, the mixers 17
(spoiler  ailerons) and 18 (spoiler  elevator) can
be used together, to raise the flaperons at a large
angle of deflection and also to re-trim the elevator
accordingly.
However, particularly with the ailerons, the total
travel must be considered with operation as aileron
and flaperons. The settings in the dual rate function
must be adapted, if necessary, in order not to let the
servos reach their mechanical limits.
All three mixers can be changed between two
programmable settings using a switch attached to
socket 7 on the transmitter board. If the mix
proportion is set to 0% in one switch setting it makes
the respective mixer effectively inactive.
With movement of the throttle/spoiler control stick
(control function 1) both aileron servos can be
adjusted for landing using the INC / DEC buttons
from 0 to ±125% (0% = mixer inactive).
A switch connected to socket 7 of the transmitter
board, allows this function to be changed between
two options "SA0" and "SA1" (spoiler  ailerons).
The mixer must have the position, of control function
1, set that corresponds to normal flight, i.e. with the
spoilers retracted, and the ailerons in their neutral
position. The neutral point of this mixer is set after
calling the subroutine "SA OFFSET" by pressing the
CH SEL button: The spoiler control is moved into the
appropriate neutral position, normally the bottom
position of the control stick, and the CLEAR button is
pressed. The display will indicate the offset, being
the deviation from the control central position. The
offset is identical for both switching positions and
only needs to be set once.
Note
:
When Butterfly landing mode is wanted, codes 17 &
19 are used with both ailerons (flaperons) deflected
upward and the flaps extended downward.