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Multiplex PROFIcar4000 Manual

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PROFI mc 4000PROFI mc 4000
Version 2.0
15
10. Gyro suppression
Why suppress the gyro?
We have already discussed this when we dealt with
the V-characteristic for analogue switches:
The gyro counteracts unwanted movements of a
helicopter around the vertical axis, but it also
tends to damp out intentional commands when
the pilot operates the yaw (tail rotor) stick.
For this reason it is necessary to reduce the ef-
fect of the gyro when you apply a tail rotor com-
mand.
This is how it used to work:
In the base types there was only the GYRO servo.
There it was possible to control gyro sensitivity. How-
ever, it was not possible to include the effect of the
yaw control if you had programmed the helicopter us-
ing the UNIVERSAL base type.
This is how it works now:
You can set the level of gyro suppression required by
setting up the system as follows: control the GYRO
servo using an analogue switch which has the V-
characteristic and is operated by the YAW (tail rotor)
control. This is the procedure:
1. Define an analogue switch
Starting from the operating screen move to the
„Assign switches“ menu by pressing b q g.
Open the select field by pressing x and select
the analogue switch A1. If your tail rotor control
is not on Control A (left-hand stick) select A3. If
you choose analogue switch A1 the menu should
now look like this:
Assigning switches
ANALOGUE SW.: A1 Ä
;FROM CONTROL: A
,EFFECT : MAX +100%_
As long as the select field is still open you can
press the y button to change the characteristic
for the analogue switch to „V“. The designation
then changes to V1.
2. Changing GYRO with the analogue switch
Return to Menu 2 by pressing k, then move on
to Menu 1 by pressing the n button. Press b b
to move to the menu for setting the number of
points and to assign the switches. Press the b
button to open the select field for the servos and
select GYRO. That is servo 7 in the base types.
Now you can open the switch select field by
pressing w, and select the analogue switch V1.
The analogue switch must now be reversed with
the y button to ensure that gyro effect is dimin-
ished when you move the tail rotor stick away
from centre. The menu now looks like this:
No.of points+switch
;SERVO 7:GYRO
INPUT :GYRO
, 3-PNT V1-A# _
V1-A means that the analogue switch A1 has
been assigned the V-characteristic and is oper-
ated by control A. The down-arrow indicates that
the analogue switch has been reversed.
3. Setting the fixed value for
the GYRO transmitter control
In the base types control H is assigned to GYRO.
No physical control exists for it. We now have to
apply a fixed value to this control in order to give
the servo a value too. This value then represents
the control signal for maximum gyro sensitivity.
Starting from the menu shown above for switch
assignment, return to Menu 1 by pressing k k,
and then move to the Adjust Controls menu with
the x button.
Press the x button to open the select field and
search for the GYRO control. Press b to move
on to select the options, then search for FIXED
VALUE. If you now open the adjust field by
pressing w, you can set the appropriate value
using the q/n buttons or the Digi-adjustor. The
menu should then look something like this:
2: Hover 1450
CONTR H :GYRO Ä
;FIXED VAL.
,ON +100%_
'' TIP:
Note that a flight mode is displayed in the top line of
the menu; this indicates that the setting applies only
to this one flight mode. If you wish to use gyro sup-
pression in more than one flight mode, you must as-
sign the fixed value in all the modes separately.
… 15


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