Bedienungsanleitung Graupner MX-16 HoTT (Seite 109 von 200) (Englisch)

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Program description: wing mixers – ﬁxed-wing model

ing ﬂaps are deﬁned; this is intentional, as it elimi-

nates the danger of errors when a ﬂap command is

given.

The basic programming procedure

Use the 1.  buttons of the left or right-hand touch-

key to select the desired mixer.

Use the2.  button of the left or right-hand touch-key

to move to the right-hand column, marked by the

switch symbol

at the bottom edge of the screen.

Touch the central 3. SET button of the right-hand touch-

key; the corresponding input ﬁeld is now highlighted

(black background).

Use the arrow buttons of the right-hand touch-key to 4.

set the desired value, and assign the switch if neces-

sary, as described on page 57.

With the exception of the “Diff. red.” line, negative and

positive parameter values are possible; this may be

necessary to obtain the correct direction of servo ro-

tation (control surface deﬂection).

Simultaneously pressing the  or  buttons of

the right-hand touch-key (CLEAR) resets an altered

value to the default value.

Touch the central 5. SET button of the right-hand touch-

key to conclude the input process.

Mixer neutral point (offset)

The neutral point of the mixers …

Aileron  NN *

Elevator  NN *

… is by default the zero point of the transmitter control,

i. e. that is the point at which they have no effect. At the

end-point of the transmitter control the full mixer value is

applied.

The default neutral point (“offset”) of the mixers …

Airbrake  NN *

… at which the airbrakes are always retracted, is the

forward position of the Ch 1 stick (throttle / airbrakes) if

you select “none” in the “Motor at Ch 1” line of the “Base

settings” menu, and is the back position of the Ch 1

stick if you select “none/inv”.

diff aile (differential aileron travel)

Aileron differential compensates for an unwanted side-

effect which occurs when ailerons are deﬂected: the

problem known as “adverse yaw”. When ailerons are

deﬂected, the drag generated by the down-going aileron

is greater than that produced by the up-going aileron.

The differential drag causes a yawing motion around the

vertical axis in the opposite direction to the desired turn.

This effect is much more pronounced in model gliders

with high aspect ratio wings than in power models with

their much shorter moment arms, and usually has to be

countered by giving a simultaneous rudder deﬂection in

the opposite direction to the yaw. However, this in turns

causes additional drag and reduces the aircraft’s ef-

ﬁciency even further.

Aileron differential reduces the angular travel of the

down-going aileron relative to the up-going aileron, and

this reduces the drag and therefore the adverse yaw.

However, electronic differential can only be applied

if each aileron is actuated by its own servo, usually

mounted in the wings themselves. The shorter pushrods

also result in virtually slop-free aileron linkages with

reliable centring.

Mechanical solutions are also possible, but they usually

Notes:

There are various alternative methods of positioning •

the camber-changing ﬂaps; these include:

a) settling on just one position per ﬂight phase, sim-

ply by setting appropriate trim values in the “Pha-

se trim” menu, as described on the preceding

double-page;

b) controlling the ﬂaps manually using any transmit-

ter control assigned to “Input 6” (in the “Transmit-

ter control settings” menu - see page 94), after

setting the basic ﬂap positions in the “Phase trim”

menu, as described earlier. Ideally the transmit-

ter control would be one of the rotary proportional

controls CTRL 6 … 8.

The selected transmitter control directly operates

the two ﬂap servos connected to receiver outputs

6 and 7, assuming that you have speciﬁed ﬂaps in

the “Ail. / Flap” line of the “Base settings” menu.

The same control determines the ﬂap setting of

the ailerons via the percentage value entered in

the “FL  AIL” mixer line.

However, for ﬁner control of the ﬂap positions, we

recommend that you reduce their travel to about

25% in the “E6” line of the “Transmitter control

settings” menu.

c) It is also possible to leave the default setting of

“0%” in the appropriate line of the “FL  AIL”

menu, and to assign the same transmitter con-

trol to both input 6 and input 5 in the “Transmitter

control settings” menu. The magnitude of the ef-

fect on the two pairs of wing ﬂaps can then be ad-

justed using the servo travel adjustment facility.

If a transmitter control is assigned to input “7”, it will •

be de-coupled by the software if two camber-chang-

* NN = Nomen Nominandum (name to be stated)

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Graupner MX-16 HoTT Seite 109

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