Flight manual DG-1000S
Issued: March 2002
6.9
6.8.10
DG-1000 ballast chart (for 6.8.5)
To determine the max. allowable waterballast in the wing tanks for max. take off
weight 750kg
1 kg = 2.2046 lbs.
3.785 kg (l) = 1 US gal.
Flight manual DG-1000S
Issued: March 2002
6.10
6.9
C.G. calculation
The actual C.G. can be determined as follows:
For each item, the moment mass x C.G. has to be determined and to be added up
and divided by the total mass. See the following example:
1 kg = 2.2046 lbs. = .264 US gal. water
0.305 m = 1 ft
Item
mass
C.G. behind
Moment
[kg]
Datum [m]
[m×kg]
Aircraft empty (with Battery in the fin)
430
0,740
318,20
Pilot front
75
- 1,350
- 101,25
Rear
85
- 0,280
- 23,80
Waterballast in the wings
140
0,206
28,84
Water in the fin tank5,4
5,260
27,86
Ballast in box in the fin
9,6
5,400
51,26
Total:
745
X
S
=
0,404
301,1
(X
S
= Moment/Mass)
The limits of the in-flight C.G 0,190m - 0,440m should not be exceeded!
The most important C.G. positions (behind datum):
Pilot:
The C.G. position is dependent on the pilots shape, mass and thickness of
the parachute. The pilot C.G. position can be determined by executing a weight
and balance measurement with glider empty and equipped with the pilot etc. see
maintenance manual. Please note, that the distance a has to be measured with
both configurations, as it may change due to deflection of the landing gear.
The pilot C.G. can be determined by the following equation:
X
P
= (X
SF
* M
F
- X
SE
* M
E
)/M
P
M
F
= flight mass
X
SF
= flight C.G
M
P
= pilot mass
M
E
= empty mass
X
SE
= empty C.G.