Bedienungsanleitung Graupner MC 22S (Seite 149 von 180) (Englisch)

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Programming examples – Fixed-wing models

ted, then a mixer has to be set up which deﬂ ects the

ailerons slightly to the left. Heading changes around

the lateral (elevator) axis can be corrected in a similar

way using a mixer acting upon the elevator:

a) Correction around the lateral axis (elevator)

LinearMIX 3: „RU  EL“

Asymmetrical setting. The exact values required

must be found by ﬂ ight testing.

b) Correction around the longitudinal axis (aileron)

LinearMix 4: „RU  AI“

Asymmetrical setting. The exact values required

must be found by ﬂ ight testing.

In most cases relatively small mixer values are called

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

del to model. If you use one of the curve mixers 5 or

6, the mixer ratios can be adjusted even more accu-

rately to match different rudder deﬂ ections. Again, no

deﬁ nite values can be stated, as they vary for each

model.

Vertical climb and descent

Many models exhibit a tendency to deviate from the

ideal line in vertical climbs and descents.

To correct this we need an elevator centre position

which varies according to the throttle setting. For ex-

ample, if the model tends to pull out of a vertical de-

scent by itself when the motor is throttled back, slight

down-elevator must be mixed in at this throttle setting

using a “C1  EL” mixer.

This can be achieved in either of two ways: using

the pre-programmed “Brake  Elevator” mixer in the

»Wing mixers« menu – in which case you must not

forget to move the “brake offset” to coincide with your

throttle minimum position in the »Model type« menu.

Alternatively you could program a free mixer. If all the

free mixers are in use, you can use the “CurveMIX 5”

mixer as a linear mixer to achieve this function.

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

but once again there is no substitute for test-ﬂ ying.

Rolling (movement around the longitudinal axis)

at idle

When you reduce the throttle setting, the model may

tend to roll slightly in one direction. Clearly an aileron

correction has to be made.

However, it is much more elegant to let a “C1  AI”

mixer correct this effect than to move the stick manu-

ally. Here again, a curve mixer is recommended, e.g.

“CurveMIX 6”, which is again programmed as a linear

mixer, albeit this time with a very small mixer ratio.

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, set one reference point in the

centre of the stick travel.

Rolling when ailerons and ﬂ aps are extended

If you ﬂ y the landing approach with both ailerons de-

ﬂ ected up, the model may show a tendency to roll

slightly due to minor variations in aileron servo travel

(or constructional inaccuracies). The model may turn

to either side by itself. Once again, this tendency can

easily be corrected using a “C1  AI” mixer to vary

the compensation according to the position of the ai-

lerons / landing ﬂ aps.

If you are using the pre-programmed »Wing mixer«

“Brake  3 Elevator” to correct the fault described in

the left-hand column under the title “Vertical climb and

descent”, you can still use CurveMIX 5.

You must provide a means of switching the mixer on

and off using the external switch which controls the

aileron / landing ﬂ ap function. The mixer therefore

only has any effect when the aileron / landing ﬂ ap

function is activated. The correct value must be found

through test-ﬂ ying.

Summary

The settings described on this page are intended pri-

marily for the expert ﬂ yer who needs an F3A aero-

batic model which ﬂ ies with absolutely accurate, neu-

tral control response.

Please bear in mind that reﬁ ning the ﬂ ying characte-

ristics of a model to this extent involves tremendous

effort, time, sensitivity and expertise. Some experts

continue the programming procedure even when they

are ﬂ ying. It is not advisable to try this if you are just a

moderately advanced pilot making your ﬁ rst attempt

with an F3A aerobatic model. You would be well ad-

vised to request help from an experienced pilot, and

carry out the ﬁ ne-tuning adjustments mentioned here

one by one, with the expert at your side, until your

model exhibits the neutral ﬂ ying characteristics you

are aiming for. At this point, when your model is ﬂ ying

perfectly, you can forget all about trimming, and con-

centrate on ﬂ ying the aerobatic manoeuvres themsel-

ves, which are not necessarily easy to ﬂ y well.

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Graupner MC 22S Seite 149

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