SECTION 7.
SAILPLANE WEIGHING
TECHNICAL SERVICE MANUAL
SZD-54-2
„Perkoz”
page 7.2
Allstar PZL Glider Sp. z o.o.
Doc No. 542.4.02
Issue II
April 2014
Revision
corrected
Fig. 7-1. Sailplane weighing
CPK
– chord line of wing root rib
L
horizontal distance between nose and tail wheel axles adopted in
calculations is 259,45
”
X
CG
location of sailplane centre of gravity relative to reference datum [in]
a
horizontal distance between nose wheel axle and reference datum adopted
in calculations is 63,
19”
m
sailplane mass [lb]
w
1
indication of front scale [lb]
w
2
indication of rear scale [lb]
In case of serious damage to fuselage or rear or front undercarriage,
dimensions „a” and „L” after repairs have to be checked and actual values used in
CG position calculations.
Reference datum is a plane perpendicular to plane made by root aerofoil
chords, and passing through points on leading edge of root aerofoils.
Mass and CG position are derived from these formulas:
2
1
w
w
m
a
b
X
CG
2
1
2
w
w
L
w
b