User Manual

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 full right and then 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 values changed if necessary to fine-tune the mix.
JR XP9303 Detailed Function Descriptions 87