Programming Examples Introduction - GRAUPNER mx-20 Hott Programming Manual

mx-20 HoTT programming
Preparatory measures based on the example of a winged model
Programming models in an mx-20 HoTT ...
... is easier than it may appear at fi rst!
The basic requirement for "clean" programming,
however, and this applies not only to the mx-20
HoTT, but basically to all programmable transmitters,
is the mechanically correct installation of all remote
control components in the model! Therefore, it should
be ensured no later than on connection of the linkages
that the servos are in their respective neutral position
and their rudder lever is also in the desired position.
Otherwise you should loosen the rudder and re-fasten
it with an offset of a few lobes. If, in the process, the
servos are moved into position using a servo tester,
such as the RC-Tester with Order No. 2894.12, the
"correct" position can be determined very easily.
The possibility of changing the neutral position of a
servo in practically every modern transmitter is only
intended for the fi ne-tuning. Greater deviations from
"0" can result to further asymmetries in the course of
the further signal processing in the transmitter. In the
same manner: A car with a bent chassis does not get
any straighter if only the steering wheel is trimmed to
"straight"!
An additional important point is the adjustment of
the rudder paths: This should take place through
a corresponding adjustment of the steering points,
insofar as possible. Ultimately this is far more effi cient
than extensive efforts with the path adjustments in the
transmitter! In this case: Path adjustments serve fi rst
and foremost for to compensate for the manufacturer-
stipulated tolerances for the servos and their fi ne-tuning,
and less for the compensation of carelessness.
If two separate aileron servos are used for a
winged model, the ailerons, controlled through the
236 Detail program description - Control adjust
corresponding activated wing mixer – see the following
pages – can be assigned with both the fl ap function and
raised with the brake fl aps – however this would make
more sense in a glider or electro glider than in a motor
model.
In this case the rudder arms – starting from the neutral
position – should be tilted forward one lobe, pointing
toward the nose, set to the respective servo.
The mechanical differentiation achieved through this
asymmetric assembly contributes to the fact that the
brake effect of the elevated ailerons increases with their
defl ection and, therefore, does not normally require a
greater path upward than downward.
Correspondingly, when planning to operated separately
controlled fl ap servos, they should also be integrated
into a crow system. Since the brake effect of this fl ap
position referred to as a "crow position" is infl uenced
less by the elevated ailerons than the downward
defl ection of the fl aps, the rudder arms should be
installed somewhat toward the rear in this case, tilted
toward the trailing edge. As a result, there is a greater
available path for the downward defl ection. With such
a combination of lowered fl aps with raised ailerons,
however, the latter should only be elevated moderately,
because they have more of a stabilizing and controlling
function than a braking function in this type of crow
system.
A "tip" for seeing the brake effect in this connection:
Spread the fl aps and look above and below the surface
from the front. The greater the projected surface of the
protruding rudder, the greater the brake effect.
Outboard ailerons
Inboard camber-changing flaps
(Eine ähnlich asymmetrische Montage der Ruderarme
kann z. B. an Spreiz- bzw. Landeklappen auch in einem
Motormodell sinnvoll sein.)
If a model is completed and mechanically attuned in this
respect, you can basically begin with the programming
of the transmitter. The following examples, an attempt is
made to follow the practice of fi rst describing the general
basic settings and then fi ne-tuning or specializing them
in the subsequent steps. After the initial fl ight and over
the course of the further fl ying in of a model, it may be
necessary to occasionally adjust some of the settings. As
a pilot's experience increases, however, so does the desire
for enhancements and expansions of settings. For this
reason, the sequence of options is not always adhered to
or some options are even mentioned multiple times.
Of course, just the opposite can also be the case,
that not everyone of the described steps is relevant
for a certain model, just as some users may miss the
description of a certain step for their model ...