MULTI-POINT MIXER – Ex: ELIMINATE PITCH-COUPLING (continued)
A42
5. Set Points for Travel and Direction. There are 7
points along the travel of the Rudder (the line that is
intersected by the vertical line that moves right and
left with the Rudder stick). At each point an Elevator
deflection may be defined. A point that is set to 0%
represents no Elevator deflection at that point. A
negative value at a point typically indicates Up Elevator
movement while a positive value results in Down
Elevator movement. A point set to INH takes on the
value of the curve/line between the 2 adjacent points.
The direction of travel may be reversed (Up Elevator vs.
Down Elevator) by changing values from negative (-) to
positive (+) (moving the point values above and below
the 0% line).
Since the aircraft pitches to the gear with the application
of both Right and Left Rudder, the Elevator deflection will
be zero at the center (Point-3) (no mixing) and the points
either side of Point-3 will be negative, indicating Up
Elevator movement. The more negative a point value, the
more Up Elevator deflection. Set the points initially to the
following values.
Point-0
- 10% (At full Right Rudder the Elevator will deflect
Up 10%)
Point-1
INH (Takes on the value along the curve between
Point-0 & Point-2)
Point-2
-3% (Elevator deflects Up 3% when Rudder is
moved to Point-2)
Point-3
0% (no Mixing – no Elevator deflection when
Rudder is at neutral)
Point-4
-3% (Elevator deflects Up 3% when Rudder is
moved to Point-4)
Point-5
INH (Takes on the value along the curve between
Point-4 & Point-6)
Point-6
-10% (At full Left Rudder the Elevator will deflect
Up 10%)
6. Offset. Point-3 represents the Offset position and
corresponds to the Rudder stick being at neutral.
It is
important to leave Point-3 set at 0% to make sure there
is no mixing and therefore no Elevator deflection when
the Rudder is at neutral.
7. Verify Operation. Turn the RX on and turn the mix
on using the Gear switch. Move the Rudder stick
from full right to full left. The Elevator should deflect
Up when the Rudder is moved in both directions. If
it moves down instead, change the percentages to
(+) values instead of (-) values at each point. If the
Elevator appears to be moving too much, reduce the
point values (less negative). If the Elevator does not
seem to move enough, then increase the point values
(more negative). Now turn the Gear switch to the OFF
position and verify that the Elevator does not move.
While test flying the aircraft, make note of the mixing and
whether it is generating enough up-Elevator during knife-
edge to stop it from pitching to the gear, or generating
too much Elevator input, causing it to pitch to the canopy
instead of the gear. Also note the approximate position of
the Rudder stick when pitching occurs. Land the aircraft
and adjust the points closest to the position of the Rudder
stick when pitching occurs for more or less Elevator
deflection until the aircraft no longer pitches during knife-
edge. More negative generates more Up Elevator and less
negative generates less Up Elevator. Points 1 and 5 may
be activated and their value changed if necessary to fine-
tune the mix.
Note: To completely disable or otherwise
inhibit a mixer, highlight either the Master or
Slave and press the CLR button.
To Next Page
Loading...
Need help?
General
