110
Programming example: delta and fl ying wing
effect, in the »
Servo display
«, or on the model itself,
and change the prefi xes if necessary.
If you carry out the programming as described above,
the ailerons will also move in the same direction, like
fl aps, 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 »
contr
set.
« menu; simply set these inputs to “empty”.
Many years ago, when the mc-20 was the top-of-the-line
transmitter, the author fl ew a model delta programmed
exactly in this way, with the following additional refi ne-
ments: “fl ap settings” used as trim, and butterfl y (crow)
as landing aid – the latter exploiting the “brake
¼
aile”
and “brake
¼
fl ap” wing mixers to provide complete
compensation for pitch trim changes. In this case the
term “ailerons” means the outboard wing control sur-
faces, and “fl ap” the inboard pair of control surfaces.
A modern sweptback fl ying 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. Defl ecting the
inboard control surface(s)
down
increases lift and pro-
duces an
up-elevator effect
. Defl ecting them up creates
the opposite effect. In contrast, the outboard ailerons act
in the reverse direction: a
down
-defl ection produces a
down-elevator
effect, and vice versa. In this case there
are really no limits to what you can achieve with careful
thought and the sophisticated mixers of the
mx
-16iFS.
However, please note that you should be extremely
careful when setting differential travel with such a
confi guration, regardless of the type of servo arrange-
ment you have selected. This is because differential
travels tend to produce an asymmetrical elevator effect
on a tailless model, 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 fi rst few fl ights.
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
fi tted 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 107 dealing with “Servos running in parallel”.
You may also want both rudders to defl ect 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
¼
4
” and “
c1
¼
second rudder control chan-
nel
” with suitable travel settings. The offset 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 required to defl ect outwards proportionally
when the brakes are extended.
Summary of Contents for mx-16 ifs
Page 1: ...mx 16 Programming Manual mx 16iFS 1 gb 3D CYLINDER ROTARY SELECT INTELLIGENT FREQUENCY SELECT...
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