Bedienungsanleitung Graupner MX-16 HoTT (Seite 180 von 200) (Englisch)

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Programming example: delta and ﬂying wing

“Free mixers” menu (pages 127 … 132)

typ fro

… and setting up one linear mixer “Tr elev  5”, and - if

necessary - “Tr elev  6”.

Move to the graphic page of this menu to set the re-

quired mixer ratios. Check the settings, and above all

the direction of effect, in the “Servo display”, or on the

model itself, and change the preﬁxes if necessary.

If you carry out the programming as described above,

the ailerons will also move in the same direction, like

ﬂaps, when you move the elevator stick. The effect of the

“tr” option is that the elevator trim lever also affects the

associated mixer when you operate the elevator stick.

Since an additional transmitter control is no longer

required for this arrangement, you should disable input 5

and (if used) input 6 in the second column of the “Trans-

mitter control settings” menu; simply set these inputs

to “free”.

Many years ago, the author ﬂew a model delta pro-

grammed exactly in this way using the mc-20, with

the following additional reﬁnements: “ﬂap settings” used

as trim, and butterﬂy (crow) as landing aid - the latter

exploiting the “Brake  AIL” and “Brake  FL” wing

mixers to provide complete compensation for pitch trim

changes in both directions. In this case the term “ailer-

ons” means the outboard wing control surfaces, and

“ﬂaps” the inboard pair of control surfaces.

A modern sweptback ﬂying wing can be controlled in

a similar fashion. These models also feature inboard

and outboard control surfaces: the former forward of

the Centre of Gravity, the latter aft of it. Deﬂecting the

inboard control surface(s) down increases lift and pro-

duces an up-elevator effect; deﬂecting them up creates

the opposite effect. In contrast, the outboard ailerons act

in the reverse direction: a down-deﬂection produces a

down-elevator effect, and vice versa. There are really no

limits to what can be achieved with appropriate settings

of the system’s sophisticated mixers.

However, please note that you should be extremely

careful when setting differential travel with such a con-

ﬁguration, regardless of your model’s set-up, its tail type

and the number of servos you are using. This is because

differential travels on a tailless model tend to produce

an asymmetrical elevator effect, rather than the desired

adverse yaw reduction. For this reason it is advisable

to start with a differential setting of 0% - at least for the

ﬁrst few ﬂights. When you are familiar with the model

and feel the need to experiment, it may then be feasible

under certain circumstances to try differential settings

deviating from zero.

For larger models it could be advisable to install winglets

ﬁtted with rudders, i. e. small vertical surfaces at the

wingtips. If these are actuated by two separate servos,

they can be controlled as described in the example on

page 177 dealing with “Servos running in parallel”, or

using “Channel mapping” in the “Telemetry” menu; see

page 140.

You may also want both rudders to deﬂect outwards

when a braking system is operated using the Ch 1 stick,

and this can be accomplished as follows: if you have

selected the “normal” tail type, set up two further mixers

“c1  4” and “c1  second rudder control channel”

with suitable travel settings. The offset for both mixers

should be +100%, as the Ch 1 stick is usually at the

forward end-point when the airbrakes are retracted, and

the winglet rudders are only required to deﬂect outwards

proportionally when the brakes are extended.

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Graupner MX-16 HoTT Seite 180

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