Maintenance Manual DG-808C
Issued: May 2012 TN 800/41
5.1
5
Weight and balance
1.
Assemble the glider completely with gear down.
2.
Empty fin ballast box and water ballast tanks, retract the engine, close the
canopy.
3.
Place scales under the tailwheel and if suitable scales are available under the
main wheel.
4.
The fuselage must be levelled so that the top of the aft fuselage boom has a
tail-down slope of 1000 : 37.
5.
Read weight of tail wheel: W2, be certain the wings are level and hold so that
no load is applied. Read W1 if suitable scales are available, otherwise see
note below.
6.
Measure the distance between perpendiculars through points a and b. (See
figure, next page).
Caution:
The distances a and b may change with different masses due to
deflection of the landing gear.
Note:
The total mass M may be determined by weighing and adding W1 and
W2 or by weighing and adding the masses of all components.
Using the empty mass and the values determined above, calculate the C.G. as
follows:
C.G. empty
X
SL
:
X
SL
= W
2L
• b/M
L
+ a
M
L
= empty mass = W
1L
+W
2L
W
2L
= load on tailwheel (empty)
The empty weight includes all accessories but excludes pilots and parachutes.
Remove loose objects and any removable trim ballast from the cockpit.
C.G. in flight
X
SF
:
X
SF
= W
2F
• b/M
F
+ a
M
F
= flight mass = W
1F
+W
2F
W
2F
= load on tailwheel (flight mass)
The flight mass includes empty weight items plus pilot, parachute, trim ballast
and all items needed in flight (barograph, camera, cushions, etc.). In addition,
the rudder pedals and seating position should be adjusted as in flight.
Summary of Contents for DG-800A
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