Handleiding Multiplex Easyglider Pro 21 4226 (pagina 15 van 52) (Duits, Engels, Frans, Italiaans, Spaans)

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radio control system’s adjustment facilities, you may need to re-

install the swivel pushrod connector in a different hole in the

horn.

Gilding the lily - applying the decals

The kit is supplied with a multi-colour decal sheet, part 2. Cut out

the individual name placards and emblems and apply them to

the model in the positions shown in the kit box illustration, or in

another arrangement which you find pleasing.

Balancing the model

Like every other aircraft, your EasyGlider PRO must be balanced

at a particular point if it is to fly efficiently and stably. Assemble

the model completely, ready to fly. Corrections are possible by

altering the position of the receiver battery or the flight pack. If

this is still not sufficient, add nose ballast or tail ballast until the

model balances at the stated point.

The Centre of Gravity should be at a point 70 mm back from the

leading edge of the wing, measured where the wings meet the

fuselage. Mark this point on the underside of the wing roots with

a waterproof felt-tip pen. Support the model at the marked points

on two fingertips, and the aeroplane should balance level. Make

any adjustments required, and mark the location of the airborne

components once you have found the correct position in the

fuselage, so that you can be sure always to replace the battery in

the same position.

Fig. 30

Preparing for the first flight

For the first flight wait for a day with as little breeze as possible.

The early evening is often a good time.

If this is your first model aircraft, your next step is to ask an

experienced model pilot to help you, as things usually do not go

well if you try to manage on your own. Your local model flying club

should be able to help you find someone, or - failing that - your

nearest model shop may be able to assist you. Our flight

simulator for the PC can also provide valuable experience prior

to your “first real steps” in model flying.

You can download the simulator at no charge from our website

www.multiplex-rc.de. You will also need the matching interface

cable for your MPX transmitter; this is available from model shops

under Order No. # 8 5153.Be sure to carry out a range check

before the first flight.

Just before the flight, charge up the transmitter battery and the

flight pack (or receiver battery) using the recommended

procedures. Ensure that “your” channel is not already in use

before you switch on the transmitter.

Ask your assistant to walk away from the model, holding the

transmitter. The aerial should be fitted but completely collapsed.

Your assistant should operate one of the functions constantly

while you watch the servos. The non-controlled servo should

stay motionless up to a range of about 60 m, and the controlled

one should follow the stick movements smoothly and without

any delay. Please note that this check can only give reliable results

if the radio band is clear of interference, and if no other radio

control transmitters are in use -

even on different channels. If the

range check is successful, repeat it with the motor running

(EasyGlider Electric only). There should be no more than a very

slight reduction in effective radio range with the motor turning.

If you are not sure about anything, please don’t risk a flight. Send

the whole system (including battery, switch harness and servos)

to the Service Department of your RC system manufacturer and

ask them to check it.

The first flight ...

Glider:

A test-glide from shoulder level, directly into wind, will give you

an approximate idea of the model’s “trim”, i.e. whether it is set

up correctly, or whether the control surfaces or transmitter trims

need to be adjusted. If the model swings away to one side,

move the rudder trim slightly in the opposite direction. If the model

banks - one wing lower than the other - apply slight aileron trim

correction.

Hand-towing

This is the classic method of launching a glider to height. Attached

to a suitable length of towline, the model is pulled up by your

assistant running into wind; the glider will rise up the line in a

similar fashion to a kite. The towline first needs to be prepared

as follows: tie the towring and a pennant to the “model” end of

the line. The ring is engaged on the towhook 32, the towline

unwound and your assistant (launcher) takes the free end and

walks upwind until the line is taut. The model should be held

under gentle tension before it is released. The launcher watches

the model (over his shoulder), adjusting his pace to maintain a

steady rate of climb. Take care not to overstress the model during

the launch; this is a particular danger in a fairly strong wind.

Bungee launching

This is the easiest method of launching a glider of this size, as

no assistant is needed, and launch heights of around 100 m are

easily achieved. From this altitude quite long flying times can be

achieved, and they will be even longer if you manage to contact

a thermal, although this does depend on the prevailing weather.

Thermal flying

Making the best use of flat field thermals is not particularly easy,

and calls for considerable skill and experience. Areas of rising

air are harder to detect and recognise at a flat field, because they

tend to occur at higher altitude than at the hillside, where it is

often possible to find lift while the model is cruising along the

edge of the slope and then circle away in it. A thermal at a flat field

which occurs directly overhead is very hard to recognise, and to

exploit it to the full requires a highly skilled pilot. For this reason

it is always best to go thermal seeking off to one side of where

you are standing.

You will recognise thermal contact by the glider’s behaviour. Good

thermals are obvious because the model will climb strongly, but

weak thermals take a practised eye to detect, and you will need

a lot of skill to make use of them. With a little practice you will be

able to recognise likely trigger points for thermals in the local

landscape. The ground warms up in the sun’s heat, but heat

absorption varies according to the type of terrain and the angle

of the sun’s rays. The air over the warmer ground becomes

warmer in turn, and the mass of warm air flows along close to

the ground, driven by the breeze. Strong winds usually prevent

thermal build-up. Any obstruction - a shrub or tree, a fence, the

edge of a wood, a hill, a passing car, even your own model on

the landing approach - may cause this warm air to leave the

ground and rise. Imagine a drop of water on the ceiling,

wandering around aimlessly, and initially staying stuck to the

ceiling. If it strikes an obstruction it will fall on your head. A triggered

thermal can be thought of as the opposite of the drop of water.

The most obvious thermal triggers include sharply defined snow

fields on mountain slopes. The air above the snow field is cooled,

and flows downhill; at the edge of the snow field, part-way down

the valley, the cool air meets warm air flowing gently uphill, and

pushes it up and away as if cut off by a knife. The result is an

extremely powerful but bumpy thermal bubble. Your task is to

locate the rising warm air and centre your model in it. You will

need to control the glider constantly to keep it centred, as you

Multiplex Easyglider Pro 21 4226 Handleiding

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