Balancing: The
75"
Extra 330
LT
can use a wide range of center-of-gravity locations. The range is from
5.25” – 6.0” from the leading edge of the wing measured at the root where the wing meets the fuselage. The
forward edge of this range will be more nose-heavy for sport and precision flight, the rear edge of this range
provides better 3D performance.
When trimming your CG, keep in mind that a “neutral” CG (one with which you can roll the airplane inverted
and the airplane neither climbs nor dives) is good for 3D aerobatics, but a more forward CG (one with which
you must hold some “down” elevator to keep the airplane flying straight while inverted) is often better for
precision flight and is much easier to land gracefully.
Control Throws - Throws are given both in degrees and in millimeters, measured at the end of the surface
(where the throw is greatest).
Ailerons- Low Rate 15 degrees
30% exponential
High Rate 30 degrees
70% exponential
Elevator- Low Rate 15 degrees
30% exponential
High Rate Maximum possible throw, at least 45 degrees 75% exponential
Rudder-
Low Rate 30 degrees
30% exponential
High Rate 45 degrees
75% exponential
Make your first flight with the controls set on low rates. During the trimming phase, we recommend landing
with some throttle, and not attempting to “dead stick” the airplane. This may mean you need to time your
flights and keep them a bit shorter than usual. After your first flights, check all control connections and motor
and prop mounts for tightness.
31
