Handleiding Multiplex Easyglider Pro 21 4226 (pagina 18 van 52) (Duits, Engels, Frans, Italiaans, Spaans)

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L.H. wing

panel

Elevator

Spinner

Wing section

The wing features a cambered airfoil section over which the air

flows when the model is flying. In a given period of time the air

flowing over the top surface of the wing has to cover a greater

distance than the air flowing under it. This causes a reduction in

pressure on the top surface, which in turn creates a lifting force

which keeps the aircraft in the air. Fig. A

Centre of Gravity (CG)

To achieve stable flying characteristics your model aircraft must

balance at a particular point, just like any other aircraft. It is

absolutely essential to check and set the correct CG position

before flying the model for the first time.

The CG position is stated as a distance which is measured aft

from the wing root leading edge, i.e. close to the fuselage. Sup-

port the model at this point on two fingertips (or - better - use the

MPX CG gauge, # 69 3054); the model should now hang level.

Fig. B

If the model does not balance level, the installed components

(e.g. flight battery) can be re-positioned inside the fuselage. If

this is still not sufficient, attach the appropriate quantity of trim

ballast (lead or plasticene) to the fuselage nose or tail and secure

it carefully. If the model is tail-heavy, fix the ballast at the fuselage

nose; if the model is tail-heavy, attach the ballast at the tail end of

the fuselage.

The longitudinal dihedral is the difference in degrees between

the angle of incidence of the wing and of the tail. Provided that

you work carefully and attach the wing and tailplane to the

fuselage without gaps, the longitudinal dihedral will be correct

automatically.

If you are sure that both these settings (CG and longitudinal

dihedral) are correct, you can be confident that there will be no

major problems when you test-fly the model. Fig. C

Control surfaces, control surface travels

The model will only fly safely, reliably and accurately if the control

surfaces move freely and smoothly, follow the stick movements

in the correct “sense”, and move to the stated maximum travels.

The travels stated in these instructions have been established

during the test-flying programme, and we strongly recommend

that you keep to them initially. You can always adjust them to

meet your personal preferences later on.

Transmitter controls

The transmitter features two main sticks which the pilot moves

to control the servos in the model, which in turn operate the

control surfaces.

The functions are assigned according to Mode A, although other

stick modes are possible.

The transmitter controls the control surfaces as follows:

Rudder (left / right) Fig. D

Elevator (up / down) Fig. E

Aileron (left / right) Fig. F

Throttle (motor off / on) Fig. G

Unlike the other controls, the throttle stick must not return to the

neutral position automatically. Instead it features a ratchet so

that it stays wherever you put it. Please read the instructions

supplied with your radio control system for the method of setting

up and adjusting the transmitter and receiving system.

Basic information relating to model aircraft

Any aircraft, whether full-size or model, can be controlled around the three primary axes: vertical (yaw), lateral (pitch) and longitudinal

(roll).

When you operate the elevator, the model’s attitude alters around the lateral axis. If you apply a rudder command, the model swings

around the vertical axis. If you move the aileron stick, the model rolls around its longitudinal axis. External influences such as air

turbulence may cause the model to deviate from its intended flight path, and when this happens the pilot must control the model in

such a way that it returns to the required direction. The basic method of controlling the model’s height (altitude) is to vary motor

speed (motor and propeller). The rotational speed of the motor is usually altered by means of a speed controller. Applying up-

elevator also causes the model to gain height, but at the same time it loses speed, and this can only be continued until the model

reaches its minimum airspeed and stalls. The maximum climb angle varies according to the power available from the motor.

Fuselage

Canopy

Rudder

L.H.Aileron

Fin

Tailplane

R.H. wing

panel

Longitudinal axis

vertical axis

lateral axis

R.H. Aileron

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