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And now one small, but very important difference:
What happens to the trims?
With many mixers it is necessary to include the trim
slider positions with the "pure stick signal". For exam-
ple, that applies to a V-tail, otherwise it would not be
oossible to trim the elevators and rudder. The same
also applies to the elevator control of a llying wing
model.
On the other hand there are mixers in which the posi-
tion of the trim sliders should not be included. Example:
"snapjlaps" on an aerobatic model. In this case the
wing control surfaces should not deflect when the
elevator trim slider is shifted; flap movement is only
required when you "control" the elevator.
It depends theretore on your particular application,
whether you want the mixing inputs with or without
trims, and this applies equally to the USR mixers.
You can choose this too:
We will return to the first example we discussed here.
We had this display:
ru:,Ft-fl I iiI {:+T+F:i
r I l'lF. r: ELEr"rH r
Press the Z key again; "ELEVATOR"
flashes.
lf you now press the E key, " +T" will appear
This means "with trim", and indicates that the
tion is now mixed in with the ELEVATOR
input:
rU:;Fj-l'1 I :'i I {: +T+F: i
r I I' l F. :: EL E r-r H+T r
lf you press the El key again, "+T" disappears again,
and the mixing occurs "without trims".
One last time:
Please bear in mind (as already described above)
that you must re-assign the USR-Mixers every time
you alter their definition, otherwise the changes will
not take eftect.
next to it.
trim posF
Over the course of its existence the model helicopter
has developed into a sophisticated and demanding
machine. The demands these machines make on the
radio control system are no less comprehensive. The
PROFI mc 3010, with its vast flexibility, is more than a
match for all these requirements;
thanks in in particular
to the specialised "helicopter mixers" and the user-de-
fined mixers, which can be used to fulfil almost any con-
ceivable need. Experts will also be delighted to exploit
the possibility of "switching memories in flight" (see
page 68).
lf you already have some experience with choppers the
lollowing Section will probably present no problem.
ll you are a beginner to the world oJ the whirling rotor,
we strongly advise you to read and study modelling
magazines and specialist books to complement the
information in this manual.
That is not because the PROFI mc 3010 is complicated,
but because helicopters are inherently complex. And
because it is not possible to start with 2 or 3 functions,
as with a fixed-wing model. lt is far outside the scope of
this manual to go into the basics and finer points of heli-
copter control systems, as they are by no means as
easy to understand nor as easy to imagine as those of
tixed-wing models. Some of the commonly used terms
are explained in this section where necessary; and you
will find some further explanations under "Some heli-
copter terms" on page 76.
In this Section we start from the assumption that you
are already familiar with the way the transmitter works,
so that we can concentrate on the characteristics oJ the
helicopter.
Even if you consider yourself an expert and a helicopter
specialist you should at least carry out a few "dry runs"
with the fixed wing examples, so that you become famiF
iar with the way the transmitter works.
As a minimum, you should teel at home with the
method of finding your way around the menus, and with
selecting, correlating and adjusting servos and trans-
mitter controls.
Basically the "helicopter" transmitter is operated in the
same way as for a fixed-wing model. Everything that we
have said up to now on working with memories, mixers
and so on, applies in f ull to the helicopter transmitter.
However, there is one fundamental difference: every
modern model helicopter is tlown with at least one
mixer right from the start, and most oJ them feature sev-
eral mixers. The "collective Ditch/throttle curve" is
another feature which is peculiar to the helicopter
world.
But now: down to business.
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