While dual rates do allow different
rates so that the pilot can perform
3D maneuvers, exponential is the
second equation to controlling
the “big throws” on an aircraft.
Simply stated, exponential allows
less movement at center stick
while increasing the movement
as the sticks move toward the
end of their travel to accomplish
the maximum throw rate. This
gives the pilot a softer feel around
center stick and allows the plane
to fly precisely with the higher
rates. But the pilot can still enjoy
the full throws of the control
surface when needed. Exponential
works in unison with rate settings
and is another part of the
programming so that your radio
controls perform exactly the way
you want them.
to check you radio manual for
the correct direction to go when
inputting the percentage.
The best way to input exponential
is slowly; always start out with
a small percent like 10–15%.
Once you have trimmed out
the airplane, try the starting
percentage, then fly the plane
and see how that feels. Land and
put in another 5–10%, and fly
the plane again. If the plane feels
good to you, keep repeating the
process while adding a little more
expo each time. When the flight
performance starts to
feel sluggish or slow, land the
plane and program in the last
percentage that felt right
to you. The final number will be
different for each pilot and could
range from 5% all the way up to
85–90% or more.
RADIO PROGRAMMING PRIMER
Exponential will generally have a graph like this on a displayed screen so that you
can see a visual reference of what is programmed in.
With exponential on, you will still have full movement when the stick reaches the
end of travel on the control surface. There will just be a bigger amount of surface
travel on the second half of the stick movement.
With exponential on, the control-surface movement will be less when the
transmitter stick is halfway—how much less depends on the amount programmed in.
With no exponential, linear movement will result in full control movement at the
end of the transmitter stick movement.
No exponential creates linear movement from the stick to the control surface. So
when the transmitter stick is halfway, the control has also moved halfway.
There is no way around it:
Exponential is a setting you have
to feel out. You have to fly the
plane and try different settings to
find one that works for your type
of flying and aircraft. Exponential
is programmed in by using a
percentage value, and depending
on your brand of transmitter, this
could be a positive or negative
percentage to get the softer feel
at center stick. If you go the wrong
direction, you will make the center
stick more sensitive, so be sure
ExponEntial is a sEtting you havE to fEEl out. you havE to fly thE planE and try diffErEnt
sEttings to find onE that works for your typE of flying and aircraft.