XL
39
O
WNER
’
S
F
LIGHT
M
ANUAL
38
The CG Box:
When doing a w&b on your Velocity, you are actually working
with a see-saw. The aircraft center of lift is the fulcrum, and the
pilots, passengers, fuel and baggage are the riders. The idea is to
maintain a balance between the center of lift and the center of
gravity (CG). In ideal situations, the CG should be slightly for-
ward of the center of lift. If the CG falls behind the center of lift,
you will have an unstable aircraft which is potentially very danger-
ous in a stall situation. In canard aircraft, we always want the
canard to stall prior to the main wing, causing the nose of the air-
craft to lower, and thus slightly accelerating the aircraft and main-
taining normal controlled flight. All operations in this aircraft
must be forward of the aft limit of your CG box.
Establishing the CG box for the Velocity has been done by the
factory using flight testing and basic aerodynamics. The theory
calls for maintaining a 2-to-1 loading on the canard versus the
main wing. The canard is also flown at a much greater angle of
attack than the main wing, thus inducing a stall in the canard first.
If either one or both of these rules are broken, the result will be
an extremely dangerous aircraft. So always, operate your aircraft
within the prescribed CG box. The centers of lift of all Velocities
should be very close to each other unless a major mistake has
been made by the builder, or a major modification to the position,
size, and incidence of the flying surfaces has been made due to
error or by intentional experimentation. Small modifications to
an aircraft can severely alter the flight characteristics, and the
resulting aircraft can have a completely new forward and aft CG
limit. Therefore, you could be flying within the limits of the CG
box for a standard Velocity, but flying out of the CG box for your
own aircraft. Small errors will have little effect, but if your wings
or canard are an inch out of place, the situation will have to be
taken into account. So if you built your aircraft with everything
where it is supposed to be, you can use the standard CG box
126
127
128
129
130
131
132
133
134
135
2800
2600
2400
2200
2000
1800
1600
1400
Gross Weight in LBS
Air
craft CG:
Inches
AFT of D
A
TUM (nose)
CG Box / Limitations in Weight & Balance
First Flight
Box
Expanded Flight Envelope
CG BOX
for Velocity Model
XL
127” Forward Limit
134.0 Aft Limit
Summary of Contents for XL RG
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