GRAUPNER mx-12 Hott, Programming Manual

Page: 111 / 200

111 Program description: wing mixers – fixed-wing model
ail

flaps
(Aileron  flap)
This mixer feeds a variable amount of the aileron signal
into the flap channel. When an aileron command is
given, the flaps “follow” the ailerons, although usually
through a smaller angle, i. e. the mixer ratio is gener-
ally less than 100%. The adjustment range of -150%
to +150% allows the user to set up the flap direction to
match that of the ailerons.
The flaps should not deflect more than about 50% of the
(mechanical) travel of the ailerons.
Simultaneously pressing the
 or  buttons of the
right-hand touch-key ( CLEAR ) resets an altered value
to 0%.
brak

elev
(Airbrake  elevator)
or
Extending any form of airbrakes usually generates an
unwanted change in airspeed; this is especially marked
when a butterfly (crow) braking system is deployed (see
next page).
This mixer feeds a corrective signal to the elevator to
compensate for such an effect. The adjustment range is
-150% to +150%.
Simultaneously pressing the
 or  buttons of the
right-hand touch-key ( CLEAR ) resets an altered value
to 0%.
“Usual” values are generally in single to low double
figures. It is essential to check and adjust this setting at
a safe height, and it is also important to ensure that the
model does not slow down too much when the airbrakes
are extended. The danger is that you might need to
retract the brakes again on the landing approach when
you realise the model will “land short”; if its airspeed is
too low when you retract the brakes, the model will just
fall to the ground at that point.
brak

flap
(Airbrake  flap)
When you operate the brake function (Ch 1 stick), both
flap servos move together for the landing approach; the
mixer ratio can be set to any value in the range -150% to
+150%. Down-flap is usually selected.
Simultaneously pressing the
 or  buttons of the
right-hand touch-key (
CLEAR
) resets an altered value
to 0%.
At this point you select the value which causes the flaps
to deflect down as far as possible when the airbrake
function is deployed. However, please ensure that none
of the servos concerned strikes its mechanical end-
stops (servos stalled). To achieve this, you may need
to limit the servo travel(s) using the “Travel -/+” option,
which is found on the “
RX SERVO
” display page of the
“
Telemetry
” menu.
brak

aile (Airbrake

aileron)
When you operate the brake function, both aileron
servos move together for the landing approach; the
mixer ratio can be set to any value in the range -150%
to +150%.
Simultaneously pressing the
 or  buttons of the
right-hand touch-key ( CLEAR ) resets an altered value
to 0%.
Note:
It can also be useful to deflect both ailerons up slightly
when the airbrakes are extended; in most cases this
significantly reduces the risk of a tip-stall.
Combination of the “Brake

NN *” mixers:
“Crow” or “Butterfly” setting
If you have set up all three airbrake mixers for your
model, it is then possible to program a special configura-
tion known as the “
crow ” or “ butterfly ” arrangement for
glide path control. In the butterfly setting both ailerons
are deflected up by a moderate amount , and both flaps
down by the maximum possible amount . The third mixer