Pilot´s Operating Handbook of ATEC 322 Faeta LSA with Rotax 912iS engine
ATEC v.o.s. Libice nad Cidlinou, Czech Republic
Page 47 of 56
9.5.
Centre of gravity determination
The aircraft has to be weighed in flight position including crew and fuel.
Weight on main wheels
G
1
(lb)
Weight on front wheel
G
2
(lb)
Total weight G
1
+ G
2
G = G
1
+ G
2
(lb)
Distance from main wheel axis to front wheel axis
x
MW-FW
= 4,724
(ft)
Distance from main wheel axis to wing leading
edge in wing root area
x
MW-LE
= 2,493
(ft)
CG distance from main wheel axis
x
MW-CG
= G
2
* x
MW-FW
/ G
(ft)
Length of MAC
b
MAC
= 3,648
(ft)
Length of wing chord in the root area
b = 4,265
(ft)
Back-swept MAC displacement
s
y
= 0,617
(ft)
Distance from CG to leading edge
x
CG
= x
MW-LE
– x
MW-CG
(ft)
Distance from CG to leading edge of MAC
x
CG-MAC
= x
MW-LE
– x
MW-CG
– s
y
=
= 1,87 – 4,724 * G
2
/ G
(ft)
x
CG-MAC%
= x
CG-MAC
* 100 / 3,648
= 51,26 – 129,5 * G
2
/ G
(%)
