Manual Graupner MX-16 HoTT (page 120 of 200) (English)

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Program description: helicopter mixers – model helicopter

Adjusting the throttle and collective pitch curves

A practical procedure

Although the throttle and collective pitch control systems

are based on separate servos, they are always operated

in parallel by the throttle / collective pitch stick (except

when auto-rotation is invoked). The Helicopter program

automatically couples the functions in the required way.

In the mx-16 HoTT program the trim lever of control

function 1 only affects the throttle servo, i. e. it acts as

idle trim (see “Digital trims” on page 58).

The process of adjusting “throttle” and collective pitch

correctly, i. e. setting the motor’s power curve to match

the collective pitch setting of the main rotor blades,

is the most important aspect of setting up any model

helicopter. The program of the mx-16 HoTT provides

independent adjustment facilities for the throttle, collec-

tive pitch and torque compensation curves.

These curves can be deﬁned using a maximum of ﬁve

reference points. To deﬁne the control curves all you

have to do is set individual values for these ﬁve points in

order to determine each control curve.

However, before you set up the throttle / collective pitch

function it is important to adjust the mechanical linkages

to all the servos accurately, in accordance with the set-

up notes provided by the helicopter manufacturer.

Note:

The hover point should always be set to the centre

position of the throttle / collective pitch stick.

Idle setting and throttle curve

Note:

Since electric power systems by their nature require no

idle setting, it is not necessary to adjust the idle value.

However, the matching of the throttle and collective pitch

curve(s) must still be carried out as described here, in a

similar way to a glow-powered helicopter.

The idle setting is adjusted solely using the trim lever

of the Ch 1 function, with the throttle limiter closed, as

described in detail on pages 99 to 100.

Reference point 1 of the throttle curve deﬁnes the throttle

setting when the helicopter is in a descent, but without

affecting the hover setting.

This is a case where you can exploit ﬂight phase pro-

gramming to use different throttle curves. An increased

system rotational speed below the hover point proves to

be useful in certain circumstances; for example, for fast,

steep landing approaches with greatly reduced collective

pitch, and for aerobatics.

The diagram shows a curve with

a slightly altered throttle setting

below the hover point at the cen-

tre of stick travel.

+100%

OUTPUT

2 3 4 51

Control travel

Different throttle curves are programmed for each ﬂight

phase, so that you can use the optimum set-up both for

hovering and aerobatics:

Low system rotational speed with smooth, gentle •

control response and low noise at the hover.

Higher speed for aerobatics with motor power settings •

close to maximum. In this case the throttle curve also

has to be adjusted in the hover range.

The basic set-up procedure

Although the mx-16 HoTT transmitter provides a

broad range of adjustment for the collective pitch and

throttle curves, it is essential that you ﬁrst adjust all

the mechanical linkages in the model according to the

information supplied by the helicopter manufacturer, i. e.

all the system linkages should already be approximately

correct in mechanical terms. If you are not sure of how

to do this, any experienced helicopter pilot will be glad to

help you with the basic set-up.

The throttle linkage must be adjusted in such a way

that the throttle is just at the “fully open” position at the

full-throttle setting, or the speed controller of an electric

helicopter is set to full-power. When the throttle limiter

is at the idle position, the Ch 1 trim lever should just be

able to close the throttle completely, without the servo

striking its mechanical end-stop (quick throttle adjust-

ment using the “digital trim”: see page 58). With an

electric helicopter the motor should stop reliably when

the throttle limiter is closed.

Take your time, and carry out these adjustments very

carefully by adjusting the mechanical linkage and / or

changing the linkage point on the servo output arm or

the throttle lever. Only when you are conﬁdent that all is

well should you think about ﬁne-tuning the throttle servo

using the transmitter’s electronic facilities.

Caution:

Read all you can about motors and helicopters, so

that you are aware of the inherent dangers and the

cautionary measures required before you attempt to

start the motor for the ﬁrst time!

With the basic set-up completed, it should be possible to

start the motor in accordance with the operating instruc-

tions supplied with it, and adjust the idle setting using

the trim lever of the throttle / collective pitch stick. The

idle position which you set is indicated in the transmit-

ter’s basic screen display by a horizontal bar in the

display of the Ch 1 trim lever’s position. Refer to page 58

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Graupner MX-16 HoTT Manual

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