Operation Manual

ManualsBrandsMultiplex ManualsMiscellaneousPROFImc3010

The

"throttle

curve"

The

level of motor output, i.e. the

position

of the throttle

slide

in the carburettor, is usually derived trom the

posi-

tion of the collective

pitch

stick

for normal flying. The

relationship betvveen the two is termed the

"throttle

curve".

The

options

You can select either of two types of

curve:

"3-pointcurve"

Fig.37;

"s-point

curve"

Fig.38.

The

philosophy

concerning control

and adiustment

is the same

for

both curves:

The starting

point

is always the hover, as this is the

most

important

basic adjustment. The collective

pitch

reouired for the hover is determined within close limits

the

design

of the helicopter. The required

"throttle"

setting for the hover is adjusted to match the collective

pitch

setting.

The next important

"corner

point"

is maximum collec-

tive

pitch.

This cannot be set to any old value, however,

as it deoends on the maximum oower oJ the motor. For

this

reason full

throttle

set

first,

and the

maximum

possible

collective

pitch

subsequently set to

match it.

The last corner

ooint

"minimum

throttle" at low

collec-

tive oitch. On oider transmitters this is where the

"idle-

up", or throttle

pre-select

function was used. To avoid con-

fusion, we have also termed this

point

"lU'.

this case

the throttle is adjusted with the rotor

"unloaded";so

that

the rotor

speed

remains

nearly

constant as

possible.

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0 50%

100!6

Fig.38

ffsP

Full

throttle forward". s-ooint curve

fbsP

"Full

throttle back", s-point

curve

First the 3-point curve.

Stay at

"fi3P"

and

press

the

key.

"HP"

(hover point)

will flash. You

are already at the

point

where

you

adjust

the

"hover

throttle" setting. Use the

keys

(or

the Digi-Adjustor), to set the desired value; e.g. 750lo

(here

00/o

throttle closed; 1000/o

Jull throttle).

Move

the stick back to the

full-throttle

oosition and hold

there.

The

display

will now

show

P+

instead

"HP";

and

you

can again

set

the correct value

using

the

and

keys, or the Digi-Adjustor.

Caution:

you

are now

adiusting

collective

pitch

maximum

(not

full throttle)!

This method

of adjustment

based on

practical

experi-

ence:

full

throttle

fixed

value, and

maximum

collec-

tive

pitch

must

be set to

match

that

value. lf

you

want

proof

that

you

are actually setting collective

pitch

maxi-

mum,

you

can later move to the

"Asymmetrical

Travel"

option, and examine COLLECTIVE PITCH travel at

"stick

back".

There

you

will f ind

the same

value

set.

Now to minimum throttle. Move the stick foMard and

hold it there; the display will now show

"1U".

You can

now set the carburettor

position

for collective

pitch

mini-

mum; e.g. 100/0.

The

s-point curve

The setting-up

procedure

is similar to that outlined

above.

doubt

you

realise

that

you

must first

select

"5P"

instead of 3P

you

have

already set up a 3-point curve, then those

values

still apply. Otherwise

you

should set those three

points

firsl, as already

described.

100fi

Throttle

---:.7

Collective

pitch

stick

point

curue

Fig.37

The

3-point curve

simpler

set up, and

adequate

in most cases. lt also forms the basis Jor the s-point

rve.

The

s-point curve oflers a

further,

adjustable

point

above and below

the hover

point,

so that

you

can

match

the

required motor

power

accurately to the charac-

teristics of

your

motor. By

setting these two

points

the

"throttle

curve"

endowed with either a

progressive

regressive shape. lt

also

provides

an easier

method of

increasing

power

for

"negative

collective

pitch"

i.e. for

aerobatics.

The only drawback is that it

gives you

work

the adjustment stage.

The

additional Doint

in the middle.

between

hover

Doint

and

maximum collective

pitch,

is termed

"S+",

the

point

between

hover

and

minimum

collective Ditch

"S-".

How to

set

the

points

It is very helpful

you

become familiar with the

process

of selecting

and adiusting these

curves, so

we recom-

mend that

you

carry out the

following

practice

session.

At the

"Adjust

transmitter controls" menu, select the

COLLECTIVE

PITCH

control, and then select the

"Throttle

curve" ootion. The menu will look like this:

rEt:t::[tLL.

[:UE:t-lEr

rf'f'IF HF: bül{ r

Press the

key;

the

"bottom

left-hand

corner"

will

flash.

You

can

now

select either

'fl'

'fb',

using the

key.

Choose between

"3P"

and

"5P"

with

the

and

keys.

You can

probably

guess

what

the abbreviations

mean

already:

ff3P

"Full

throttle foMard". 3-ooint curve

fb3P

"Full

throttle

back". 3-boint

curve

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