User manual

ManualsBrandsGRAUPNER ManualsModel Making Remote ControlsMZ-18 HoTT Handheld RC 2,4 GHz No. of channels: 9 Incl. receiver

100

With helicopter models, input 9 is assigned to propor-

tional dial DV1 with the mz-18 HoTT transmitter, and

input 12 is assigned to the proportional dial DV1 with the

mz-24 HoTT transmitter:

BACK

Starlet

ST 1

ST 2

ST 3

ST 4

NONE

DV 1

SERVO

PITCH

Roll 1

Pitch-axis1

Tail rotor

Aux 1

Throttle

Gyro

Governor

Aux 2

T:CO

BACK

Starlet

10.

11.

12.

ST 1

ST 2

ST 3

ST 4

NONE

DV 1

NONE

SERVO

Aux 3

Aux 4

Aux 5

T:CO

Roll 1

Pitch-axis1

Tail rotor

Aux 1

Throttle

Gyro

Governor

Aux 2

PITCH

Note:

In contrast to the display of the 12-channel

mz-24 HoTT transmitter shown below, only

channels 1 … 9 are shown in the display of

the 9-channel mz-18 HoTT transmitter.

With this default setting, it is unnecessary to program

two Quick Links (THR.HOLD and no THR.HOLD) that

is frequently the usual approach with other remote

control systems. As opposed to THR.HOLD, increasing

the system speed below hovering is much more

ﬂexible and can be adjusted and more precisely with

the options offered by the they mz-18 HoTT mz-24

HoTT transmitters. If you would still like to program your

helicopter with THR.HOLD, then turn off the gas limit

function described below by switching input 9 or 12

to NONE .

Gas limit function

Meaning and use of gas limit

In contrast to ﬁxed-wing models, the performance of the

power unit for helicopters cannot be directly controlled

with the CH1 control stick; it can only be indirectly

controlled by the gas curve settings made in certain

helicopter menus of the function menu, or by a governor

if the model has one.

Note:

For different Quick Links, you can of course

also adjust individual gas curves when

programming the Quick Links.

Both methods of controlling the output prevent carbu-

rettor motors of a helicopter from approaching to idling

during normal ﬂight which allows them to be reliably

started and stopped without additional intervention.

The gas limit function elegantly solves this problem

by limiting the position of the throttle servo or the

performance of a motor control unit: The proportional

dial DV1 that is at the top left on the mz-18 HoTT

transmitter and the front left of the mz-24 HoTT

transmitter. This makes it possible to optionally turn

down the gas to idle with the gas limit control, upon

which the trim control of the throttle/pitch control stick

assumes control, or to directly turn off an electric drive.

Conversely, the throttle servo or motor control unit can

only reach its full throttle position when the gas limit

control also releases the entire travel.

The set value on the (right) plus side of the "Travel"

column in the display "CH5-9" or "CHK5-12" of the

submenu "D/R,EXP" of the function menu, page 173,

therefore has to be large enough so that, when the gas

limit control is at its maximum position, the full throttle

setting achievable by the gas curve settings is not

limited. Normally, a value between +100 % and +125 %

is set.

BACK

NORMAL

Starlet

CH6

CH7

CH8

CH5-12

+100%

INC

RES

DEC

+100%

CH5

+100%

+125%

+100%

CH10

CH11

CH12

CH9

D/R – D/R –D/R + D/R +

The value on the (left) minus side of the "Travel" column

should be set to allow an electric drive to be reliably

switched off with the gas limit control, or to allow a

carburettor to be closed enough so that the gas engine

can also be switched off in conjunction with digital CH1

trim. This value should therefore (at least initially) be left

at +100%.

This variable limitation of the throttle travel allows the

drive to be comfortably started and stopped, and gen-

erally this approach is signiﬁcantly safer. Imagine what

could happen if for example you carried a helicopter to

the takeoff site while the motor is running and acciden-

tally a activated the CH1 control stick.

If the carburettor or motor control unit is open to much, a

beep sounds when you turn on the transmitter, and the

following message appears in the main display:

Warning

Thr.HOLD

Thr.POS

Thr.CUT

QLink

Please select RF ON/OFF

Normal Signal

OFF

F/S setup t.b.d

Tip:

View the "Servo" menu to monitor the

inﬂuence of the gas limit control. Be sure to

remember that servo output 6 controls the

throttle servo for the mz-18 HoTT and mz-24 HoTT

transmitters.

Basic menu - Control assignment | Throttle limit function

S1006_mz-24.3.en.indd 94 17.12.2014 15:21:50