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10. Setting the Centre of Gravity
For perfect flight behaviour, the centre of gravity must be placed correctly. The
precise position can only be determined in test flights.
Attach the wings to the model, install the flight battery and put on the battery
compartment cover.
Support your model approx. 70 mm behind the nose bar. Your model should now
be balanced out with the top pointing slightly down. If required, you may move the
installation position of the flight battery or attach additional lead weights to set the
correct centre of gravity.
Our advice:
Special centre of gravity scales are offered for these settings. However, you may
also easily build one with some wooden bars. Thin wood or metal strips prevent
the foil at the wing from being damaged.
When the model is balanced in normal flight position, the centre of gravity must
be marked at the bottom of the wing (see figure 27, item 1). When the model is
balanced on its back, the centre of gravity must be marked at the top of the wing
(see figure 27, item 2).
The precise position of the centre of gravity must be verified later in flight. Observe that relocation of the centre of gravity backwards by a few mm
will improve flight performance but reduce flight stability. The model reacts very sensitive to the elevator. When the centre of gravity is too far
towards the front, the model will always try to dive and must be kept horizontal by pulling at the elevator.
11. Commissioning of the Speed Controller
Attention!
Ensure that no loose parts, such as paper, film or other objects can be sucked into the rotor during this motor test. Also make sure that the model
is held securely during this test run and that no body parts are within the rotation range or danger area of the rotor.
Use the operating instructions of the speed controller and programme it according to the manufacturer’s instructions.
Important:
Since the model has a stiff propeller, the speed controller’s brake function does not have to be activated.
After programming, perform a brief motor test to check the propeller or spinner for smooth operation.
Figure 27
