Bedienungsanleitung Graupner MX-16 HoTT (Seite 182 von 200) (Englisch)

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Programming example: F3A model

Programming example: F3A model aircraft

F3A models belong to the category of powered ﬁxed-

wing model aircraft designed for competition ﬂying. They

may be powered by an internal combustion engine or

an electric motor. Electric-powered models are eligible

and totally competitive in the international F3A “pattern”

class, and also in the F5A electric aerobatic class.

In this programming example we assume that you have

already read through the description of the individual

menus, and are therefore familiar with the general

method of handling the transmitter.

On page 164, where the section on ﬁxed-wing model

programming starts, you will ﬁnd general notes on

installing and setting up the RC system in a model,

and - of course - this applies equally to F3A models, and

therefore does not need to be repeated at this point.

If an F3A model is accurately built, it usually exhibits ﬂy-

ing characteristics which are almost completely neutral.

The perfect aerobatic model has a very smooth but pre-

cise control response, and any movement around any

one of its ﬂight axes should not affect the other axes.

F3A models are ﬂown using aileron, elevator and rudder

controls. The use of separate servos for each aileron is

almost universal. The ﬂying controls are supplemented

by control of motor power (throttle function) and in many

cases a retractable undercarriage. As a result the servo

assignment for channels 1 to 5 is no different from the

ﬁxed-wing models we have already described.

The auxiliary function “Retracts” is usually assigned to

one of the auxiliary channels 6 to 8. Ideally the retracts

are operated using one of the two switches without a

centre detent (SW 3 or SW 8). An optional “extra” - used

only if necessary - is mixture adjustment control for the

carburettor. This is generally operated by one of the

rotary proportional controls CTRL 6 … 8, connected to

one of the auxiliary channels not already in use.

Throttle or speed

controller (electric motor)

Mixture adjustment

Retracts

Rudder

Aileron or left aileron

Elevator

Right aileron

Auxiliary function

Receiver power supply

When assigning functions to the auxiliary channels at

the transmitter, it is advisable to ensure that the controls

required are within easy reach, since the advanced

aerobatic pilot has very little time to think about letting

go of the sticks - especially when ﬂying under competi-

tion conditions.

Programming

The basic programming of the transmitter has already

been described in detail in the section starting on page

166, so this section concentrates on tips speciﬁc to F3A

models.

In the …

“Servo settings” menu (page 92)

r ev cent

trav

100%

… you can adjust the servo settings to suit your model.

It has proved advisable to use at least 100% servo

travel, as precision of control can be perceptibly better if

relatively large servo travels are employed. This should

be borne in mind when building the model and design-

ing the control surface linkages. Any minor corrections

required can be made in the third column during the

initial test ﬂights.

The next step is to select the …

“Base setting” menu (page 74 … 81)

… and activate the idle trim for Channel 1 (normally

“Idle back”; i. e. full-throttle forward). The digital trim

now works at the idle end of stick travel. The “cut-off

trim” enables you to switch immediately from the “motor

stopped” position to the idle position you have previously

established just by applying a single “click” on the trim

lever (see page 58).

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