AIL DIFF. – AILERON DIFFERENTIAL
A31
When Ailerons are deflected, the Aileron that deflects
downward typically creates more drag than the Aileron
that deflects upward. If the difference in drag is great
enough, it will cause the aircraft to yaw in the direction
of the down Aileron, i.e. a roll to the right will cause the
aircraft to yaw to the left because the left Aileron deflects
downward and creates more drag. This, of course, is an
undesirable tendency that results in non-axial rolls and a
loss of heading.
The XP9303 provides an Aileron Differential function that
allows adjustment of the Aileron that deflects downward
without affecting the Aileron that travels upward and,
therefore, can eliminate yaw tendencies in rolling
maneuvers. It can also affect only the Aileron that travels
upward—this is called negative differential and is useful if
an aircraft yaws in the same direction as the Aileron input.
Aileron differential is available in the FUNC.LIST only if
the FLAPERON Wing Type was selected in the Wing Type
function in the SYSTEM Menu or a Dual channel has been
assigned to ailerons in the Wing TYPE function.
The Aileron Differential function provides for 2 differential
settings that are switch or Flight Mode selectable – Pos0
and Pos1. The 2 settings can be combined in different
ways to provide one setting that is on all of the time, or
one setting that is on and one that is off (0 differential), or
2 different amounts of differential—maybe one for normal
flying and another for flat spins.
To use the Aileron Differential function, highlight and
select AIL Diff. in the FUNC.LIST to obtain the Aileron
Differential display.
1. If there is to be a single Aileron differential setting that
is on all of the time, highlight and select Pos0 and
set a small percentage of differential. A positive value
causes the downward Aileron to travel less while a
negative value causes the upward Aileron to travel
less (negative differential). Test fly the aircraft and
return to this function to make adjustments until the
yaw tendency has been eliminated. That is all that is
required to set up a single differential setting that is
always on. Proceed with the next topic.
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