Manual Graupner MX-16 HoTT (page 188 of 200) (English)

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Programming example: model helicopter

“Transmitter control settings” menu (page 96)

trv

free

ctrl6

thr

gyr

lim

+100%

free

… will show you that transmitter control “6”, i. e. the

rotary proportional control CTRL 6, is assigned to the

“Lim” input, whereas all other inputs are programmed

to “free” by default. The “Lim” input serves as throttle

limiter. It acts solely on output “6”, to which the throttle

servo is connected.

Just to remind you:

Using the “Throttle limiter” function eliminates the •

need to program an “Idle-up” ﬂight phase.

The throttle limiter does not control the throttle ser-•

vo; it simply limits the travel of this servo in the for-

ward direction, according to the setting of the throt-

tle limiter, when required. The throttle servo is usually

controlled by the collective pitch stick via the throttle

curve or curves you have set in the “Helimix” menu,

for which reason input 6 should always be left “free”.

For more details please refer to the sections on pag-

es 116 and 117 of the manual.

Moreover the Ch 1 trim only affects a helicopter’s •

throttle servo. This section does not describe the spe-

cial features of this trim (“cut-off trim”) again, as it

is covered on page 58. (Thanks to the digital trims,

trim values are automatically stored when you switch

models and when you switch between ﬂight phases.)

You will ﬁnd a detailed description of the basic idle •

set-up procedure and the method of adjusting idle

recourse is to reverse the servo directions in the “Servo

settings” menu.

Note:

Please note one important difference in later Graupner

mc and mx radio control systems compared with

earlier equipment: the ﬁrst collective pitch servo and the

throttle servo have been interchanged.

Now move to the …

“Servo settings” menu (page 92),

r ev cent

trav

100%

… where you can set up the travels and directions of

rotation of the individual servos. The basic aim here

should be to keep servo travels at 100% wherever

possible, as this maintains best possible resolution and

accuracy. Use “Rev.” if necessary to change the direc-

tion of rotation of any servo; do check carefully that the

direction you set really is correct. The tail rotor servo,

in particular, must operate in such a way that the nose

(!) of the helicopter moves in the direction which corre-

sponds to the movement of the tail rotor stick.

A glance at the …

and throttle limit in the section starting on page 99.

Now use the arrow button  of the left or right-hand

touch-key to move to the “Travel” column, and increase

the value in the highlighted ﬁeld from 100% to 125%,

with the throttle limiter at its forward end-stop.

+100%

+125%

trv

free

ctrl6

thr

gyr

lim

free

This ensures that the throttle limiter cannot possibly

restrict the full throttle travel dictated by the collective

pitch stick when the model is in ﬂight.

Set-up note for electric helicopters:

Since electric motors by their nature require no idle

setting, the only important point when setting up an

electric-powered model helicopter is that the adjustment

range of the throttle limiter should be set signiﬁcantly

higher and lower than the adjustment range of the

speed controller, which is usually from -100% to +100%.

It may therefore be necessary to adjust the “Travel” value

of the throttle limiter to an appropriate value, such as a

symmetrical 110% setting. However, further ﬁne-tuning

can be carried out exactly as described here for the

glow-powered machine.

An additional function needs to be activated in the …

“Base settings” menu (pages 82 … 90).

Even if you are a beginner to ﬂying and are not yet

ready for this, it is advisable at least to deﬁne the auto-

rotation switch, so that you have an “emergency cut”

switch for the motor. This is carried out by selecting the

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Graupner MX-16 HoTT Manual

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