Manual Graupner MC 32 HOTT (page 101 of 345) (English)

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Program description - Base setup models | Helicopter models

BASIC SETTING,MODEL

STO SET

RF range test 99s

DSC Output PPM10

–––

Autorotation

Autorot. C1-Pos. -55% –––

After this has been done, use the selection keys to

move into the column above the switch symbol then

assign a switch to this ﬁeld, as described on page 60

in section "Switches, controls and control switches":

BASIC SETTING,MODEL

STO SET

RF range test 99s

DSC Output PPM10

–––

Autorotation

Autorot. C1-Pos. –55% 4I

Once this activation switch is closed, the ﬁrst occur-

rence of a threshold underrun will cause the program

to switch over to "Autorotation" and then remain in-

dependent of C1 position in this ﬂight phase until the

activating switch, in this example switch 4, is again

"OFF".

"Autorot. C1-Pos." has precedence over all other

ﬂight-phase switches.

Corresponding parameter settings for …

• pitch servos

• throttle servo

• tail rotor servo

• swashplate rotation, if available

• gyro setting

… are made in the »Helicopter mixer« menu,

page 190.

Cut-off

Within the framework of autorotation settings for the

mc-32 HoTT transmitter's helicopter program,

there are parameters for an emergency "Thr. CutOff"

of the throttle servo or motor actuator, refer to the

programming proposal on page 334. However, this

option is not available if an idle position is speciﬁed

in the "Throttle position AR" line of the »Helicopter

mixer« menu instead of an (emergency) OFF posi-

tion; for example, to avoid restarting the motor after

every landing during autorotation practice.

This option not only replaces the"Cut-off trim" function

known from other Graupner mc and mx transmitters

but also serves as an Emergency-OFF function at the

same time, which was not possible with the"Cut-off

trim" function.

Depending on the "forw./rear" choice made for the

"Pitch min" line of the »Helicopter type« menu, this

"Thr. CutOff" option can be coupled to a switch for

throttling down a speed controller or a carburettor

servo to the motor OFF (or idle) position.

This cut-off (or idle) position is speciﬁed in the left

column's ﬁeld, above the SEL column label, and its

value is to be established through trial and error.

A speed controller or throttle servo will only take on

this preset position when a certain servo position or

threshold is underrun and a switch is activated. This is

done by setting the desired servo position (threshold

value) into the middle column ﬁeld, directly over the

column label STO, then selecting the appropriate ON/

OFF switch function in the right column.

• If the percentage value speciﬁed for the middle

column is greater than the current servo posi-

tion, i. e. the current servo position lies below the

threshold, the switchover will occur as soon as the

switch is put into its ON position.

• If the percentage value speciﬁed for the middle

column is less than the current servo position, i. e.

the current servo position is above the threshold,

the speed controller will initially reduce motor

speed or close the carburettor's throttle servo only

to the extent dictated by the value in the left col-

umn as soon as the servo's position once under-

runs the threshold (max. +150 %) after the switch

is changed over to its ON position.

The speed controller or throttle servo will remain

in this cut-off position only until the selected

switch is again changed over followed by a one-

time throttle servo or speed controller movement

beyond the preset threshold with the throttle/brake

stick control.

The factory setting for the left column is -100 % for

the throttle servo "cut-off" position and a threshold of

+150 % servo position setting in the middle column.

BASIC SETTING,MODEL

SET SET

DSC Output PPM10

–––

Autorotation

Autorot. C1-Pos. 0% –––

SEL STO

–––

Thr. CutOff +150%–100%

Programming procedure

To change the throttle servo's preset "cut-off" posi-

tion, tap on the centre SET key of the right touch pad.

The current setting will be displayed in inverse video.

Now use the selection keys of the left or right touch

pad to set a value at which the motor is reliably "off"

without a startup of the throttle servo. For example

-125 %:

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Graupner MC 32 HOTT Manual

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