Helicopter Model - GRAUPNER mx-20 Hott Programming Manual

Channel 1 curve
Control characteristics for throttle/collective pitch stick
Using the arrow keys on the left or right touch pad, page
to the menu option "Channel 1 curve" in the multi-
function list:
Ser vo adjustment
Stick mode
Control adjust
Dual Rate / Expo
Channel 1 cur ve
Switch display
Tap the center SET key on the right touch pad to open
the menu shown below:
C1 Cur ve
Cur ve off
Input 0%
Output 0%
Point ? 0%
normal
Since the carburetor response or the effect of collective
pitch is often non-linear, you can make compensatory
adjustments to these in this menu.
The menu therefore enables you to change the control
characteristics of the motor/collective pitch stick,
regardless of whether this control function affects the
servo connected to control channel 1 directly or affects
multiple servos via various mixers.
If you have used the "Phase settings" and "Phase
assignment" menus (see pages 128 and 134 ) to
specify fl ight phases, this option can be adjusted per
fl ight phase. The fl ight phase name – e. g. "normal" – is
always shown at the bottom left of the screen.
The control curve can be defi ned by up to 6 points
(termed "reference points" below) placed anywhere
along the path of joystick travel. While the on-screen
graph considerably simplifi es the process of setting and
adjusting the reference points, we recommend that you
set fewer reference points to begin with.
Please note that the curve characteristic you set
here acts as the input signal for specifi c mixers in the
"Helicopter mixers" menu (see page 164):
"Helicopter mixers"
Collec-
C1
tive pitch
curve
stick
In the basic software set-up, 2 reference points –
namely the end-points at the bottom end of joystick
travel ("L", low = -100% travel) and the top end of
joystick travel ("H", high = +100% travel) – defi ne a
linear characteristic curve.
First, switch to your chosen fl ight phase, if necessary.
Setting reference points
By moving the transmitter control (motor/collective pitch
stick), you can reposition the vertical line in the graph
between the two end-points "L" and "H". The current
joystick position is also displayed in numerical form on
the "Input" line (-100% to +100%). The point at which
this line crosses the curve is termed the "Output", and
can be varied at the reference points within the range
-125% to +125%. The control signal altered in this
way will then affect all subsequent mixer and coupling
functions.
In the example above, the joystick is at 0% of control
travel and also generates an output signal of 0%, since
the characteristic curve is linear.
Up to 4 additional reference points can be set between
the two end-points "L" and "H", although the distance
between neighboring reference points must not be less
than approx. 25%.
If necessary, use the left or right arrow key  to drag the
marker frame downwards, until it is at the "Point" line:
C1 Cur ve
Cur ve
Input
Output
Collective pitch
Point
C1  Thr
Normal
C1  Tail rotor
Move the joystick. If a question mark can be seen in
the frame, then you can set the next reference point
by tapping the center
Simultaneously, the "?" is replaced by a number and the
value fi eld to the right of the reference point number is
highlighted:
C1 Cur ve
Cur ve
Input
Output
Point
Normal
The order in which you generate the (maximum) 4
reference points between the end-points "L" and "H" is
irrelevant, since the reference points are continuously
renumbered automatically from left to right as they are
entered.
Detail program description - Control adjust
off
0%
0%
? 0%
SET key on the right touch pad.
off
+50%
+50%
1 +50%
119