Bedienungsanleitung Graupner MX-16 HoTT (Seite 184 von 200) (Englisch)

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Programming example: F3A model

Example of MIX 1:

MIX1 c1 5

trv

0%offs

SYM

ASY

–66%

This completes the basic set-up for a typical F3A model.

Correcting model-speciﬁc errors

It is an unfortunate fact of life that even very carefully

built models exhibit minute faults and inaccuracies which

produce unwanted deviations when the model is ﬂying;

the mixers of a computer radio control system are then

needed to compensate for these deﬁciencies. In this

section we will describe how to carry out the adjust-

ments required, but please note the following points

before we get started: it is vital to ensure that the model

is built as accurately as humanly possible, is balanced

perfectly around the lateral and longitudinal axes, and

that motor downthrust and sidethrust are set correctly.

Rudder causes unwanted movement around the 1.

longitudinal and lateral axes

It is often the case that a rudder command caus-

es the model to rotate slightly around the longitudi-

nal and / or lateral axis. This is particularly trouble-

some in what is known as knife-edge ﬂight, where the

model’s total lift is generated by the fuselage, aided

by the rudder deﬂection. The result is that the mod-

el rotates and changes heading slightly, as if the pi-

lot were applying aileron or elevator at the same time.

These tendencies have to be corrected with compen-

sation around the lateral axis (elevator) and around

the longitudinal axis (aileron).

These corrections can be achieved easily with the

mx-16 HoTT, exploiting the “free mixers” once

again. For example, if the model rotates to the right

around the longitudinal (roll) axis when the rudder

is deﬂected to the right for a knife-edge pass, then

a mixer is set up which deﬂects the ailerons slight-

ly to the left. Heading changes around the lateral (el-

evator) axis can be corrected in a similar way using a

mixer acting upon the elevator:

a) Correction around the lateral axis (elevator)

MIX “rd  el”

ASYmmetrical setting. The exact values required

must be found by ﬂight testing.

b) Correction around the longitudinal axis (aileron)

MIX “rd  al”

ASYmmetrical setting. The exact values required

must be found by ﬂight testing.

In most cases relatively small mixer values are called

for - typically below 10% - but this does vary from

model to model.

Vertical climb and descent2.

Many models exhibit a tendency to deviate from the

ideal line in vertical climbs and descents. To correct

this we need an elevator neutral position which varies

according to the throttle setting. For example, if the

model tends to pull out of a vertical descent by itself

when the motor is throttled back, slight down-elevator

must be mixed in at this throttle setting.

MIX “c1  el”

As a rule you will need to set mixer values below 5%,

but once again there is no substitute for test-ﬂying.

Rolling (movement around the longitudinal axis) 3.

at idle

When you reduce the throttle setting, the model may

tend to roll slightly in one direction. Clearly an ai-

leron correction must be made. However, it is much

more elegant to let a mixer correct this effect for you

than to move the stick manually. Once again, a mixer

needs to be set up:

MIX “c1  al”

As a rule you will need to set mixer values below 5%,

but once again test-ﬂying is called for.

The adjustment process should only be carried out

in calm weather. Often all you need to do is apply the

mixer in the control segment between half-throttle

and idle. To achieve this, leave the Offset point at the

centre position, and set up the mixer ASYmetrically.

Rolling when ailerons and ﬂaps are extended4.

If you ﬂy the landing approach with both ailerons de-

ﬂected up, the model may show a tendency to roll

slightly due to minor variations in aileron servo trav-

el (or constructional inaccuracies); i. e. the model may

turn to either side by itself. Once again, this tenden-

cy can easily be corrected using a mixer to vary the

compensation according to the position of the ailer-

ons / landing ﬂaps.

MIX ”c1  al”

It is essential to provide a means of switching the

mixer on and off using the switch which controls the

aileron / landing ﬂap function (see previous page), to

ensure that this mixer only has any effect when the

aileron / landing ﬂap function is activated. The opti-

mum value has to be found by test-ﬂying.

And ﬁnally a few words on the …

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