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28
Service manual
Weight and balance
Weight and Balance
This chapter provides information on aircraft's weight and balance, which is essential for safe flying
activity.
Procedure
How to weigh the aircraft and later determine the CG correctly:
Make sure all listed aircraft parts and appliances are installed and in position.
Remove all other objects (e.g. tools, mops ...).
Empty fuel tanks except for the unusable fuel.
Fill up engine oil to the top marking.
Retract flaps and spoilers, leave control surfaces centred.
Support fuselage at the rear and level the aircraft inside a closed space.
To do this, use the provided airfoil template at lower side of the wing close to the wing root
and make sure its straight edge is level (horizontal).
Once leveled, read the scale readings and subtract eventual tare weight.
Now measure and record all readings and fill out the bottom schematic.
Datum is wing's leading edge at wing root.
CG lever arm formula for Tail-wheel aircraft (Sinus TW, Virus TW, any model):
Lever arm of CG (X) = ((G
CG lever arm formula for Nose-wheel aircraft (Sinus NW, Virus NW, any model):
Lever arm of CG (X) = ((G
Weighing form (TAILWHEEL)
Weighing point and symbol
right main wheel (G
left main wheel (G
tail wheel (G
total (G = G
D
2
1
)
D
)
L
)
2
+ G
+G
)
L
2
/ G) x b) + a
/ G) x c) - a
Scale reading
pipistrel.si
Tare
Nett
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