Gyro Settings Display; Programming, Transmitter With Proportional Controls - GRAUPNER GR-18 Notice D'utilisation

Gyro settings display

CAUTION: before you start entering settings for a new model, it is essential to select the number of aileron servos
in the Aileron servos menu point, and to define the gyro axes and orientation in the New settings menu point.
Aileron / Elevator / Rudder: shows the programmable P factors for the corresponding control surface.
Note: the gyro axes must first be defined under New settings (see section 3.4).
If you wish to disable the gyro, enter the value OFF in the appropriate control function.
P factor:
The P factor should always be set first, followed by the D factor (adjustment range in each case 0 to 10). A general rule
is that the larger the control surface, the smaller the P factor required. Start with a factor of 2 (default setting), and do
not exceed 4 - 5 as maximum value for the normal flight phase, 2 - 3 for speed, 3 - 6 for landing; the maximum value of
10 should be reserved for torque-rolls only.
WARNING: if you program separate flight phases, it is essential to select the appropriate flight phase when the
model is in the air, as inappropriate gyro settings may cause the control surfaces to oscillate, possibly resulting
in the loss of the model!
Note: the higher the model's speed, the more quickly oscillation may set in.
D factor: for a given P factor setting, the model's tendency to oscillate can be reduced by setting a lower D factor.
However, if you select a lower setting for the P factor, then you may be able to set a higher D factor value before the
onset of control surface oscillation. The gyro effect can be optimised by fine-tuning the D factor.
Note: the standard P and D values should cause the gyros to correct the model's attitude quickly when it is upset by an
outside influence, without causing oscillation, but in practice the optimum values for a particular model can only be found
by flight-testing. If the model displays little or no automatic stabilisation with the default settings, the value should be raised;
on the other hand, if the model oscillates (wave-like movements in flight), the value should be reduced.
If your transmitter has spare proportional controls, you can use them to adjust the values while the model is flying.
Some transmitters allow the corrective factors to be altered during a flight using the proportional controls, whereas
others allow fixed values only.

Programming, transmitter with proportional controls

If your HoTT transmitter is equipped with proportional controls, it is also possible to adjust the P and D factors for each
axis during a flight: what you might call 'flying the settings'. You need to assign proportional controls (e.g. the sliders on
the mc-20) to any channel in the range 5 to 16 (in this example channel 9); now you can alter the P factor (and the D
factor) using these controls. In each case the current values are shown in brackets.
Procedure, using the ailerons as an example:
GYRO SETTINGS
>AILERON:
>ELEVATOR:
>RUDDER:
(44%)K10
COEFF.:
(140%)K11
COEFF. D:
be used for some other purpose, e.g. for elevator or rudder.
• Move on to elevator and / or rudder, and select the channel and factor (you can either select the same channel,
in order to alter all the axes simultaneously, or different channels, allowing you to program the axes individually).
• Move the cursor to the Factor line, where you can also change the P factor for aileron, elevator and rudder with
priority (adjustment range up to 200%).
• Move the cursor to the D factor line, where you can alter the D factor for aileron, elevator and rudder with priority
using a proportional control (adjustment range up to 200%; channel value -100% equates to a factor of 0%, channel
value 0% equates to 100%, and +100% equates to 200%). This makes it a very easy matter to match the gyro's
corrective effect to the model's airspeed. In particular, higher gyro gain can be used for the landing approach -
without the need to switch flight phases.
• Now test-fly your model and fine-tune the values one by one until your preferred stabilising effect is achieved
without the model oscillating.
• It may be sensible or easier to activate the gyro for one axis only at first, and then to establish the optimum setting
for that axis, rather than for several axes simultaneously.
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• Move the cursor to the appropriate line, in this case "Ail" for aileron.
< >
• Press the SET button to activate the Channel field.
(2)K9
(3)K8 • Select the appropriate channel, and save the setting with pressing the SET button again
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• move the corresponding proportional control to alter the factor (adjustment range 0 -
10; 0 means no gyro correction for that axis).
• You can also adopt this factor directly by pressing the left button < or the right button >.
This frees up the channel previously occupied by the proportional control, so that it can