Extreme Flight RC EDGE 540T EXP Manual page 23

Set-up and flying tips
The CG range for the Edge starts at 3.75 inches back from the leading edge of
the wing and extends back to 4.75 inches, measured at the wing root. There is
plenty of room on the battery tray to move your battery to achieve this CG
location. This is a safe place to start and depending on your flying style you
can adjust the position of the battery to alter the CG to accommodate your
preferences. For this type of aircraft where I am going to predominantly fly
aggressive 3D I typically set the airplane up with a neutral CG, meaning that
when the aircraft is flown inverted straight and level it requires no down
elevator to maintain altitude. If your flying style leans more toward precision
aerobatics then I recommend setting your CG using the 45 degree line test.
Fly the aircraft from left to right or right to left, whichever direction you are
more comfortable with at 3/4 to full throttle. Pull the aircraft to a 45 degree
up line and establish this line and immediately roll the aircraft inverted.
Establish this line and let go of the elevator stick. Ideally the aircraft will
continue to track on that 45 degree line for several hundred feet before slowly
starting to level off. Adjust the position of your battery to achieve this flight
condition. Once satisfied with the location of your CG scribe a mark on the
battery tray so that you can position the battery in the same location each
flight and achieve the same feel and flight characteristics each flight.
I also highly recommend taking the time to properly set up your rates and
exponential settings. Setting up low rates for precision maneuvers and high
rates for aggressive aerobatics and 3D flight will allow you to experience the
best attributes of the Edge 540T EXP or any aircraft for that matter. The
recommended elevator set up will allow for close to 80 degrees of throw!
While this is great for really aggressive tumbling maneuvers, positive and
negative waterfalls and straight down dropping elevators, it can wreak havoc
on stable harriers, especially if you are just learning the maneuver. If your
radio will allow I suggest setting up 3 elevator rates or a flight condition that
will allow you a rate for precision flying, another for harriers and the
majority of 3D maneuvers and a final rate with as much travel as you can get
for the crazy tumbles and flips.
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