Allstar PZL Glider SZD-54-2 Perkoz, Technical & Service Manual, Page: 84 / 170

SECTION 7.
SAILPLANE WEIGHING
TECHNICAL SERVICE MANUAL
SZD-54-2
„Perkoz”
page 7.6
Allstar PZL Glider Sp. z o.o.
Doc No. 542.4.02
Issue II April 2014
Revision No. 2 May 2017
corrected
7.3. Calculation of sailplane without pilots CG position
In case of mounting or dismounting additional equipment in instrument panels
or in luggage compartment, also battery in tail, it is allowed to determine new values
of sailplane without pilots mass and centre of gravity position with calculation
method. Keep in mind the following restrictions:

Weight of any instrument panels (front or rear), including additional equipment,
must not exceed 11 lb.

Mass of additional equipment in luggage compartment (including batteries)
together with hand luggage must not exceed 44 lb.

Resulting sailplane without pilots CG position must be within range specified in
chart (Fig. 7
‒2.).
Calculations should be performed
using „Calculation record of sailplane
without pilots CG
”, a pattern of which is presented in Section 18., and based on
current and previous
„Equipment list” and previous „Record of sailplane weighing and
determining of CG” or „Calculation record of sailplane without pilots CG”.
Hitherto values of m
bp
and X
bp
are given in sailplane without pilots Weighing
Table provided in Flight Manual in item 6.4. These values are marked with (m
bp
)
0
and
(X
bp
)
0
in following calculations.
New values of sailplane without pilots mass (m
bp
) and CG position (X
bp
) should
be calculated from the following formulas:
(m
bp
)
1
= (m
bp
)
0
+

m
t1
+

m
t2
+

m
b
+

m
ao
     
 
       
 
1
bp
ao b t2 t1
0
bp
0
bp
1
bp
m
189,37
Δm
31,5
Δm
22,44
Δm
68,5
Δm
X m
X
        

where:
(m
bp
)
0
- hitherto sailplane without pilots mass
(X
bp
)
0
- hitherto sailplane without pilots CG position (in inches)

m
t1
- instruments mass increment in front instrument panel
68,5 - mass

m
t1
position

m
t2
- instruments mass increment in rear instrument panel
22,44 - mass

m
t2
position

m
b
- equipment mass increment in luggage compartment
31,5 - additional equipment CG position in luggage compartment

m
ao
- battery mass increment in tail
189,37 - mass

m
ao
position
2