VI-8
February 2008
Legacy
VI-9
February 2008
Legacy
General Comments:
Mean Aerodynamic Chord (or MAC) is an imaginary wing chord used for
reference to weight and balance and other computations. The Legacy center
of gravity range is approved from 10 to 25% of mean aerodynamic chord. The
C.G. location in terms of percent MAC is easily calculated as shown in the
weight and balance sheet. It provides a simple reference for C.G. location for
companison sake.
The pilot must be aware of the effect on the various loading configurations.
In general a forward C.G. improves the stalling behavior and improves aircraft
stability. Aft C.G. will in general worsen stall behavior and aircraft stability.
Changes in the center of gravity will change the trim of the aircraft. Also be
familiar with the effect of aircraft weight. A higher aircraft weight decreases
aircraft performance and raises the stall speed. The entire flight envelope should
be explored by the pilot to become familiar with the aircraft. We stress that
aft C.G. and higher weights should be experimented with very cautiously. The
minimum altitude for practicing stalls in the Lancair Legacy is 5,000 feet.
Understanding Max Zero Fuel Weight. The Legacy is subject to a max zero
fuel weight of 1,900 lbs. That means that anything beyond 1,900 lbs loaded in
the aircraft must be fuel. In other words the weight of the aircraft minus fuel
must be less than 1,900 lbs.
Be aware that the center of gravity range for the airplane changes as you
burn fuel. In the Lancair Legacy this causes the center of gravity to slowly
move forward.
We suggest you set up a spread sheet for your aircraft to easily compute all
the possible scenarios for your aircraft.
Summary of Contents for Legacy
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