GRAUPNER mx-24s Programming Manual Download Page 124

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124

Program description:

Mixers

Rounding off the collective pitch curve

In the following example the reference points have
been set as follows, as described in the last section:

Reference point value 1 to +50%,

Reference point value 2 to +90% , and

Reference point value 3 to +0%.

»Normal «

Pitch

Input

Curve

off

Point

Output

This “jagged” curve profi le can be rounded off auto-
matically simply by pressing a button. Press the

EN-

TER

button next to the “curve symbol”

»Normal «

Pitch

Input

Curve

Point

Output

Note:
The curves shown here are only for demonstration
purposes, and by no means represent realistic collec-
tive pitch curves.

Please refer to the programming examples on pages
199 for “real world” applications.

The following three diagrams show typical three-point
collective pitch curves for different fl ight phases, such
as hover, aerobatics and 3-D fl ying.

The vertical bar refl ects the current stick position. Ple-
ase note that trim values higher than +100% and lo-
wer than -100% cannot be displayed on the screen.

Typical collective pitch curves for different fl ight pha-
ses:

It can be very helpful to adjust each individual re-
ference point independently of the adjacent points
using the rotary control or a “free” INC / DEC button.

Note regarding the marker button:
If you have set the marker button in the »

Base setup

model

« menu (see page 66), a dotted vertical line

appears in this graph when you press the button; this
line shows the position of the C1 stick the last time
the button was pressed:

-30%
-30%

»Normal «

Pitch

Input

Curve

off

Point

Output

Move the C1 stick (solid line) to the marker line in or-
der to be able to read off the input and output values.

For example, if the marker line indicates the momen-
tary hover point, and you wish to place this exactly in
the centre of the control arc, then all you need to do
in this example is to transfer the “Output” value of the
marker line to Reference point “1” in the control cen-
tre. Alternatively, of course, you could adjust refe-
rence point “1” in fl ight using the rotary control or one
of the “free” INC / DEC buttons.

Once you have defi ned the collective pitch curve,
switch to the fi rst screen page by pressing

ESC

, and

then select the next line (if appropriate):

Channel 1

Throttle

A brief press on the rotary control or the

ENTER

but-

ton switches to the second screen page.

-60%
-60%

»Normal «

Channel 1

Input

Curve

off

Point

Output

Throttle

In contrast to the »

Channel 1 curve

« menu this dis-

play refers only to the control curve of the throttle ser-
vo, whereas the “Channel 1 curve” affects

all

the ser-

vos which are affected by the throttle / collective pitch
stick.

Please note that the output signal of the “Channel 1
curve” option acts as input signal for the throttle cur-
ve which is programmed at this point: the vertical line
in the diagram, which moves in parallel with the thrott-
le / collective pitch stick, follows the actual Channel 1
curve.

The throttle curve can also be defi ned by up to eight
points – termed “reference points” – which are positi-
oned along the full stick travel; different curves can be
set for each fl ight phase if you so wish.

The reference points are defi ned, adjusted and
erased in the usual way, as explained in the previous
section relating to the collective pitch curve. First de-
fi ne the throttle curve with the three points which are
already set in the software, i. e. the two end-points “L”
and “H” and Point “1” in the control centre, then adjust
the motor power curve to match the collective pitch
curve:

• In every case the throttle must be fully open at the

end-point of the throttle / collective pitch stick (ex-
ception: auto-rotation; see below).

• The hover point is normally located at the centre

of the control travel, and the throttle setting must

–

Control travel

Hover

Aerobatic

3D flying