Handleiding Graupner MC 22S (pagina 148 van 180) (Engels)

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Programming examples – Fixed-wing models

still”. This is more or less the worst possible setting for

a power model, and might well result in the model te-

aring uncontrollably across the ﬂ ying ﬁ eld, represen-

ting a serious risk to pilots and spectators alike. For

this reason we strongly recommend that you should

at least set the motor to stop or throttle back, to avoid

precisely this risk; at the same time the undercarriage

should also be set to extend automatically. Once you

have carried out these settings, you should certain-

ly check them again once the model has been test-

ﬂ own and trimmed out fully.

F A I L S A F E ( S P C M 2 0 )

P o s

h o l d

1 2 3 4 5 6 7 8

S T O

In the next section we consider the “battery fail-safe”

feature in PCM20 mode:

F A I L S A F E ( P C M 2 0 )

P o s i t i o n T i m e B a t t e r y F . S .

. 2 5 s - 7 5 %

S E L S E LS T O

The “Battery fail-safe” function, which is triggered

when the voltage of the receiver battery falls below

a particular point, moves the carburettor to a pre-set

value, which can be -75%, 0% or +75% of the thrott-

le servo’s travel. This forced throttle closure can be

eliminated again at any time simply by moving the

throttle stick, but don’t waste any time: you should get

the model down onto the ground as quickly as possib-

le and recharge the battery.

Since F3A models generally have two aileron servos,

it has proved useful to deﬂ ect both ailerons “up” for

the landing. In most cases this causes the aircraft to

ﬂ y slightly more slowly, and adopt a more stable atti-

tude on the landing approach.

To achieve this you will need to program mixers in the

menu ...

»Free mixers« (page 102)

Both ailerons are required to deﬂ ect “up” to act as

a landing aid, in parallel with the movement of the

throttle stick, but only from the half-throttle setting in

the direction of idle. The further the stick is moved to-

wards the idle position, the more the ailerons de-

ﬂ ect up. The reverse should occur when you open the

throttle: the ailerons / ﬂ aps retract to avoid the model

suddenly ballooning up.

A little down-elevator must usually be mixed in to

ensure that the model does not climb when the aile-

rons / ﬂ aps are extended.

To meet these two requirements you need the two li-

near mixers shown in the illustration below. The mi-

xers are activated using one and the same external

switch, e.g. switch No. “8”, which therefore has to be

assigned to both mixers.

Move to the second screen page, and set the ap-

propriate mixer ratios. In both cases the mixer neu-

tral point should be left at the centre point of the Ch1

stick arc.

Select the ASY ﬁ eld, set 0% for both mixers above

the centre point of the control, and the following set-

tings below the centre point, i.e. in the direction of

idle:

LinearMIX 1: -60% ... -80% and

LinearMIX 2: -5% ... -10% .

Example of LinearMIX 1:

L in e a r M I X 1 C 1 5

M i x i n p u t O f f s e t

- 7 0 % + 0 % 0 %

O U T P U T

1 0 0

S T O

A S YS Y M C L R

This completes the basic set-up for a typical F3A mo-

del.

Correcting model-speciﬁ c errors

It is an unfortunate fact of life that even very care-

fully built models exhibit minute faults and inaccura-

cies which have to be corrected using the mixers of a

computer radio control system. In this section we will

describe how to carry out these adjustments, but ple-

ase note the following points before we get started:

it is vital to ensure that the model is built as accura-

tely as humanly possible, that it is balanced perfectly

around the lateral and longitudinal axes, and that mo-

tor downthrust and sidethrust are set correctly.

Rudder causes unwanted movement around the

longitudinal and lateral axes

It is often the case that a rudder command causes

the model to rotate slightly around the longitudinal

and / or lateral axes. This is particularly troublesome

in what is known as knife-edge ﬂ ight, where all the

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

rudder deﬂ ection. The result is that the model rota-

tes and changes heading slightly, as if the pilot were

applying aileron or elevator at the same time. These

tendencies have to be corrected with compensation

around the lateral axis (elevator) and around the lon-

gitudinal axis (aileron).

This can be achieved easily with the mc-22s, explo-

iting the facilities of the »Free mixers« once again.

For example, if the model rotates to the right around

the longitudinal (roll) axis when the rudder is deﬂ ec-

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