Checking The Centre Of Gravity - Reely DLG 650 RC Notice D'emploi

16. Checking the centre of gravity

The correct positioning of the centre of gravity is crucial
for a perfect flight. It can only be established over several
test flights. For the first flight, support the "DLG 650 RC"
model glider approx. 38 - 40 mm (see figure 18, distance
A) behind the nose edge.
Your model should now be balanced with the fuselage tip
pointing slightly downwards.
If necessary, you can move the centre of gravity forwards
or backwards by placing small weights on the fuselage tip
or on the tail.
Figure 18
If the centre of gravity is moved to the front, the glider's
flight stability increases, but the gliding performance de-
creases. If the centre of gravity is moved backwards, the glider's gliding performance increases, but its flight stability
decreases. The model then reacts very sensitively to the elevator and, in extreme cases, becomes uncontrollable.
Practical tips
For the first flights, set the centre of gravity to 38 mm. This means you are on the safe side and the model flies very
stably. After the initial test flights and trim corrections, you can gradually, and in small steps, remove weight from the
tip of the fuselage and thus move the centre of gravity backwards until you are satisfied with your model's overall
flight properties.
At the same time, you can apply a small counterweight to the right wing tip to balance out the throwing pin on the left
wing. The model will then no longer tilt to the left during slow flight.
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