Pipistrel Virus 912 S-LSA Glider, Operating Instructions Manual

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AIRCRAFT OPERATING INSTRUCTIONS – VIRUS 912 S-LSA GLIDER
Page 13
5.2 Center of gravity (CG) range and determination.
a = 40.15”
c = 60”
Wfr = 107.2 lbs
Wm = 595.3 lbs
55 lbs
max
46”
Empty Weight
Wtot = 702.5 lbs
N66PV
Virus 912 S-LSA SN:
0359
Datum leading edge of wing at root
MAC 35.75 inches Length of the Line which represents the position of the wing's average (aerodynamically) cord
MAC offset 1.1 inches Forward most point of the MAC begins 1.1 inch aft of the leading edge of the wing at the root
MAC fwd CG 20% design limit
MAC aft CG 38% design limit
Fwd CG limit 8.3 inches Calculated: (20% * 35.75 + 1.1)
Aft CG limit 14.7 inches Calculated: (38% * 35.75 + 1.1)
a 40.15 inches Horizontal distance from center of nosewheel to leading edge of wing
c 60 inches Horizontal distance from center of nosewheel to line thru center of main gear
Fuel arm 4 inches Fuel wt is slightly forward of the CG range, therefore full fuel results in a forward CG
Crew arm 11.5 inches This arm puts the pilot and passenger on center of the CG range, so minimum crew wt results in most extreme CGs
Empty wt (EW) 702.5 lbs Weighed at Factory - fully configured
Empty wt CG 10.7 inches Calculated: (Wt
main gear
/ Wt
main + nose
)* c - a (595 / 702) * 60 - 40.15
Min pilot wt 119 lbs Limited by Design - but I am not sure why
Max Crew wt (P) 500 lbs (MTOW limited - with min fuel on board)
Full Fuel wt (F) 167 lbs Maximum fuel weight - 26 gal AVGAS (mogas weighs slightly less)
Max Baggage (B) 55 lbs Limited by Designer
Baggage Arm 46 inches Assumes a distributed load throughout the compartment
MTOW 1210 lbs Limited by Design
Max Fuel Payload 341 lbs Maximum combined weight of passengers and baggage if full fuel is carried
CG X inches Measured from leading edge of wing at root - must be between 8.3" and 14.7"
(EW*10.7) +(P*11.5) +(F*4)+(B*46)
(EW + P + F + B)
Forwardmost CG = 9.66 Inches Computed with light pilot, full fuel, and no baggage
(there is no way to load the Virus with CG too far forward)
Rearmost CG = 13.02 Inches Computed with light pilot, no fuel, and 55 lbs of baggage
(even with up to 100 lbs of baggage, the CG will remain within range)
X =
CG Formula:
EW = empty weight
P = pilot & co-pilot weight
F = weight of fuel on board
B = weight of baggage
X = CG in inches aft of datum
CG Range ( 8.3” < X < 14.7” )