Pipistrel Sinus 503, Flight And Maintenance Manual

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Baggage and CG
The amount of baggage you can carry in the solid baggage compartment or in the baggage pouch
behind the seats is limited by the centre of gravity of the empty aircraft (pilots’ and fuel weight do
not influence c.g.) and the MTOW.
To calculate how much the c.g. shifts because of added baggage into the solid baggage compartmet
or the baggage pouch behind the seats use the following formula:
where:
Gtotal is the aircraft empty weight,
CGmm is the position of CG of empty aicraft in milimeters (mm),
Gbags
is the weight of the baggage,
Lbags is the lever arm from the datum to baggage area (1160 mm).
Again, express the new c.g. in percentage of MAC:
where:
CGwith.bags
is the position of CG now with bags in milimeters (mm),
R is the difference between wing’s leading edge and MAC’s leading edge (69 mm),
MAC
is the Mean Aerodynamic Chord (869 mm).
We now have the data of c.g. of the sample aircraft with 10 kgs of baggage. You can recalculate the
formulas using the weights and c.g. of your empty aircraft and the planned amount of baggage for
your flight.
CAUTION:
The baggage weight limitations mentioned on page 15 of this manual represent
fool-proof limits for safe operation, even without special c.g. calculation. However, the actual
baggage weight limitation is different of each individual aicraft and can be determined using the
above formulas. The decision of how much baggage to carry on a flight is at pure responsibility
of the pilot in command!
WARNING!
Always make sure that the baggage is placed fixed inside the baggage area.
Movements of baggage in-flight will cause shifts of centre of gravity!
WARNING!
Do not, under any circumstances attempt to fly the aircraft outside the allow-
able c.g. limits! Allowable c.g. range is between 243 mm and 408 mm, measured from the wing's
leading edge backwards which corresponds to 20% - 39% MAC)
WARNING!
Maximum takeoff weight (MTOM) MUST NOT, under any circumstances, exceed
450 / 472,5kg.
CG
G CG G L
G G
kg
with bags
total mm bags mm
total bags
.
=
·
( )
+ ·
( )
+
=
·
292 2877 10 1160
292 10
316
mm kg mm
kg kg
mm
( )
+ ·
( )
+
=
CG
CG R
MAC
mm mm
mm
bags MAC
with bags
( )%
.
.
+
=
-
· =
-
· =
100 316
69
869
100 28 44%
Weight and balance