Velocity XL RG Owner's Manual page 16

With no people in the aircraft, add enough fuel to fill only the
header fuel "sump" tank (4 gal. approx.). Now record the aircraft
weight from each scale, then the combined total.
Header Fuel Tank Weight (@ 6 lbs per gallon) =
Nose Wheel Weight (with Header fuel tank full) =
Left Main Wheel Weight (with Header fuel tank full) =
Right Main Wheel Weight (with Header fuel tank full) =
Combined Total Weight (with Header fuel tank full) =
Now bring the fuel up to 15 gallons (total fuel, including what is
already in the header tank). Record the aircraft weight from each
scale, then the combined total.
15 Gallons Fuel Weight (@ 6 lbs per gallon) = 90 lbs
Nose Wheel Weight (with Header fuel tank full) =
Left Main Wheel Weight (with Header fuel tank full) =
Right Main Wheel Weight (with Header fuel tank full) =
Combined Total Weight (with Header fuel tank full) =
Now bring the fuel up to FULL CAPACITY. Record the aircraft
weight from each scale, then the combined total.
Full Fuel Capacity (gallons) =
Full Fuel Capacity Weight (@ 6 lbs per gallon) =
Nose Wheel Weight (with Full Fuel) =
Left Main Wheel Weight (with Full Fuel) =
Right Main Wheel Weight (with Full Fuel) =
Combined Total Weight (with Full Fuel) =
This information is needed to calculate the FUEL ARM for your
Velocity.
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STEP 7 Establish the Static CG of your aircraft:
Here is the text description:
•A: Nose wheel weight multiplied by the nosewheel axle ARM
•B: Mains total weight multiplied by the mains axle ARM
• Add the sum of A + B, divided by the total aircraft weight
= Static CG position
Here is the formula version (same outcome as above text ver-
sion) to obtain Static CG position:
(Nose Wheel Weight X Nose Axle ARM) + (Mains Total Weight X Mains Axle ARM)
When you multiply a weight by an ARM (distance), the result is
called a moment, and is expressed in units called INCH LBS.
Therefore, in order to simplify our calculations, the preceding for-
mula will be referred to as follows:
Here is an example using the factory Velocity N97XL:
NOSE WHEEL MOMENT X MAIN MOMENT
TOTAL WEIGHT OF AIRCRAFT
Nosewheel Axle ARM = 31"
Nosewheel weight = 40 lbs
Main gear axle ARM = 144.6
Main wheels (L+R) combined weight = 1600 lbs
Total Weight = 1640 lbs
(40x31) + (1600x144.6)
_____________________
1600+40
1240 in lbs + 231040 in lbs
_______________________ = ____________ = 141.63 inches
1640
XL
O ' F
WNER S LIGHT
Total Weight of Aircraft
= STATIC CG POSITION
= 141.63 inches aft of datum
(Static CG)
232280 in lbs
1640
M
ANUAL
aft of datum
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