Bedienungsanleitung Graupner MX-16 HoTT (Seite 122 von 200) (Englisch)

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Program description: helicopter mixers – model helicopter

in premature wear of the clutch and gear train. The main

rotor blades are generally free to swivel, and they may

be unable to keep pace with such swift acceleration, in

which case they might respond by swinging far out of

their normal position, perhaps resulting in a boom strike.

Once the motor is running, you should slowly in-

crease system rotational speed using the throttle limiter.

Important ﬁnal notes

Before you start the motor, check carefully that the throt-

tle limiter is completely closed, so that the throttle can

be controlled by the Ch 1 trim lever alone. If the throttle

is too far open when you switch the transmitter on, you

will see and hear a warning. If you ignore this and start

the motor with the throttle too far advanced, there is a

danger that the motor will immediately run up to speed

after starting, and the centrifugal clutch will at once

engage.

For this reason you should:

always grasp the rotor head ﬁrmly

when starting the motor.

However, if you accidentally start the motor with the

throttle open, the rule is this:

Don’t panic!

Hang on to the rotor head regardless!

Don’t let go!

Immediately reduce the throttle limiter, even though

there may be a risk of damaging the helicopter’s drive

train, because:

it is vital that YOU ensure

that the helicopter cannot possibly

move off by itself in an uncontrolled manner.

The cost of repairing a clutch, a gearbox or even the

motor itself is negligible compared with the damage

which a model helicopter can cause if its spinning rotor

blades are allowed to wreak havoc.

Make sure that nobody else is standing

in the primary hazard zone around the helicopter.

You must never switch abruptly from idle to the ﬂight set-

ting by suddenly increasing system rotational speed, as

this would cause the rotor to accelerate quickly, resulting

This diagram only shows the

change in the hover point, i. e. col-

lective pitch minimum and maxi-

mum have been left at -100% and

+100% respectively.

+100%

100%

OUTPUT

2 3 4 51

Control travel

Continue adjusting these settings until you really do

achieve constant main rotor speed over the full control

range between hover and climb.

The descent adjustment should now be carried out from

a safe height by fully reducing collective pitch to place

the model in a descent from forward ﬂight; adjust the col-

lective pitch minimum value (Point 1) so that the model

descends at an angle of 60 … 80°. This is done on the

“Collective pitch” graphic page by moving the vertical

line to Point 1 using the collective pitch stick, and adjust-

ing the value accordingly using the arrow buttons of the

right-hand touch-key.

As an example, this diagram

shows the changes in the collec-

tive pitch minimum value only.

+100%

100%

OUTPUT

2 3 4 51

Control travel

Hover

point

Once the model descends reliably as described, adjust

the value for “Throttle minimum” - the value of Point 1 on

the graph of the “Ch 1  throttle” mixer - so that system

rotational speed neither increases nor declines. This

completes the set-up procedure for throttle and collec-

tive pitch.

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Graupner MX-16 HoTT Seite 122

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