E-flite Super Airliner DF ARF - Manual (Page 31)

An important part of preparing the aircraft for flight is
properly balancing the model.
Caution: Do not inadvertently skip this step!
The recommended Center of Gravity (CG) location for your
Airliner is 5
1
/
2
" (140mm) back from the leading edge
against the fuselage. The Center of Gravity position has been
marked on the bottom of the wing, although the plane will be
balanced inverted.
The battery packs can be moved forward or rearward to
achieve the correct balance. Make a mark on the battery tray
so you know the correct position of the batteries when they
are replaced after charging.
Center of Gravity / Battery Installation
31