Handleiding Graupner MC16 (pagina 78 van 104) (Engels)

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Automatic Gyro Gain Control

(access via Set-Up Menu)

78 Helicopter

Gyro Control

With this option you can reduce the effect of the

Gyro sensor with increasing tail rotor stick excursion.

This will only work with a gyro system which allows

the gain to be control from an auxiliary channel of the

transmitter.

In central position of the tail rotor control stick and a

proportional module attached at socket CH 7 of the

transmitter plate the set gyro effect results. With

manipulation of the tail rotor control this effect is

reduced to the value, which corresponds to lower

setting of the control slider (CH7).The position of the

tail rotor control stick at which this minimum value is

reached can be adjusted.

The automatic gyroscope gain reduction can be

switched off using a switch attached to switch

position 7 on the transmitter board.

Basic adjustment of the Gyro sensor

In order to obtain as optimal a stabilisation of the

helicopter around the vertical axis as possible by the

gyroscope, the following suggestions should be

considered:

• The control linkage to the tail rotor should be as

low-friction and as free from play as possible.

• The control linkage should be rigid (no flexing).

• A strong and above all fast servo should be

used.

The faster the reaction of the Gyro sensor in

recognising a turn of the model, and then making the

necessary change to the tail rotor thrust to correct

the turn, the further gyroscope gain effect be

increase by rotating the gain adjusters. This should

be done so that the tail of the model does not begin

to oscillate, and will give better is stability around the

vertical axis. Otherwise the danger exists that the tail

of the model would begin to oscillate during small

gyro signals.

In addition, during high forward speeds and/or when

hovering with a strong head wind the stabilising

effect of the vertical fin in addition to the gyro’s effect

can lead to a over reaction, where oscillating of the

tail again becomes noticeable.

In order to achieve an optimum stabilisation in each

situation, the gyro effect can be adapted from the

transmitter using a slider control in connection 7. In

the upper end position of the control only gyro

adjuster 2 is effective. This is adjusted in such a way

that with zero wind in hovering flight the model does

not oscillate. In the lower end position of the control

7 only gyro adjuster 1 is effective. If you rotates this

to the minimum gyroscope effect, the gyro effect can

be set anywhere between "0" and the maximum

effect set (with adjuster 2) using control 7.

Under normal conditions you would however

normally set adjuster 1 so that the model does not

oscillate with the maximum speed or extreme head

wind. You can then vary the gyro sensitivity from the

transmitter to suit the weather conditions and the

intended flight program.

Notice

The effective stabilisation amount provided by the

Gyro sensor depends on the settings of the two

adjusters on the gyro:

Adjuster 1 set the minimum gyro effect and adjuster

2 the maximum effect.

The effect can be set between these two limits using

the slider control on channel 7.

Setting the Gyro control (Automatic Gain)

After selection of this option the display initially

shows "GYS OF" (gain system is not programmed).

The option is switched on with the INC or DEC

buttons, and the display will now show the gyro

effect setting, from the control slider, where "100%"

correspond to the upper limit and "0%" the lower

limit. With CH SEL the Gyro control setting screen is

selected. Using the INC and/or DEC buttons the tail

rotor control stick displacement point can be

specified, at which the gyro effect is reduced to the

value given by the low position of slider 7. "100%"

means full-scale (slow gain reduction) and "50%"

half travel of the tail rotor control stick (fast gain

reduction). After swapping back with the CH SEL

button you can now observe the gyro gain reduction

effect in the display when moving the control stick.

Witt CLEAR the gyro control can be switched off

again, which can also be done with switch 7.

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