Manual Graupner MX-16 HoTT (page 168 of 200) (English)

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Programming example - ﬁxed-wing model

Once you have completed the settings described thus

far, a ﬁxed-wing or powered model aircraft (the latter

if you enter the idle direction of the throttle stick in the

“Motor at Ch 1” line of the “Base settings” menu) will, in

principle, ﬂy.

However, there are no “reﬁnements” in this set-up, and

it is the reﬁnements which will give you more long-term

pleasure in your ﬂying. Assuming that you are already

capable of controlling your model safely, it’s time to get

a taste of these extra facilities; to this end we now move

on to the …

“Wing mixers” menu (pages 108 … 113)

–––

ail

diff aile.

rudd

flaps

brak

elev

flap

aile

elev

flap

aile

elev

flap

diff–red

aile

diff flaps

Note:

This menu will show a varying range of options depend-

ing on the information you have entered in the “Base

settings” menu. In the illustration above, the full range

is shown, as generated by the entries “2AIL 2FL” in the

“Ail/Flap” line, and “none (/inv) in the “Motor at Ch 1” line.

Of particular interest at the moment are “AIL-Diff.”

(aileron differential) and the “AIL  RUD” (aileron 

rudder) mixer, sometimes known as a combi-switch,

and perhaps the mixers “Brake  AIL” and “Brake 

FLAP”.

As already described in detail on pages 109 and 110,

the purpose of “AIL-Diff.” (aileron differential) is to

eliminate adverse yaw.

When a model aircraft turns, the down-going aileron

produces more drag than the up-going one if both move

through the same angle, and this causes the model to

yaw in the opposite direction to the turn. This can be

eliminated by setting differential aileron travel. A value

between 20% and 40% is usually a good starting point,

but the “perfect” setting nearly always has to be estab-

lished by practical testing.

The same applies to the “FL-Diff.” (ﬂap differential)

option if your model also features two camber-changing

ﬂap servos, assuming that the ﬂaps are also to be used

as ailerons, e. g. using the “AIL  FL” mixer.

The “AIL  RUD” (aileron  rudder) mixer serves a

similar purpose, but also makes many models generally

easier to handle when turning. A value of around 50%

is usually a practical starting point. However, it is advis-

able to be able to switch this function off, particularly if

you have ambitions as an aerobatic pilot; this is done by

assigning a physical switch to the mixer (for example,

the writer switches this mixer off “automatically” when he

switches into the “Speed” ﬂight phase, simply by assign-

ing the same switch to both options).

It is usually only necessary to set up a “Brake  ELE”

(brake  elevator) mixer if your model suffers an

excessive change of speed when you deploy the brak-

ing system. The danger is that you might need to retract

the brakes again on the landing approach when you

realise the model will “land short”; if its airspeed is too

low when you retract the brakes, the model will just fall

to the ground at that point. If you set up such a mixer it is

important to test the setting at a safe height, and adjust

the trim compensation if necessary.

If you have selected “2AIL” or “2AIL 2FL” in the “Aileron /

Flap” line of the “Base settings” menu …

stick mode

motor at C1

tail type normal

CH8 delay

aile/flap 2aile

yes

… and if you wish to be able to deﬂect both ailerons up

using the throttle / brake stick (Ch 1), then a suitable

value should be entered in the “Brake  AIL” line.

–––

–––0%

ail

diff aile.

rudd

brak

elev

aile

elev aile

In principle the same applies to the “Brake  FL” line,

which also becomes available if you have selected “2AIL

2FL”, although the set value should cause the ﬂaps to

deﬂect as far as possible in the downward direction

when the brake stick is operated. It is important to en-

sure that the servos do not strike their mechanical end-

stops. To achieve this, you may need to limit the servo

travel(s) for the servos concerned using the “LIMIT-” or

“LIMIT+” line on the “RX SERVO” display page of the

“Telemetry” menu.

If the ailerons are set up to act as simple brakes, as de-

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Graupner MX-16 HoTT Manual

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