User manual

100
Program description - Base setup models | Helicopter models
DSC output
If necessary, use the  selection keys of the left or
right four-way button to switch to the “DSC Output”
line then, with a brief tap on the center SET key of the
right four-way button, activate the value window:
SEL
Rcv Ch Map R12
R08
Base setup model
RF transmit ON
RF Range Test 99sec
DSC Output PPM10
Now you can use the right selection keys to choose
between four types of modulation “PPM10”, “PPM16”,
“PPM18” and “PPM24”. Touch the center SET key of
the right four-way button again to complete the entry.
This choice primarily influences the maximum num-
ber of control channels which can be attached to the
DSC (direct servo control) socket, and thus also avail-
able to a flight simulator or teacher/pupil system. By
selecting “PPM10” this will be control channels 1 … 5,
for “PPM16” channels 1 … 8, for “PPM18” channels 1
… 9 and for “PPM24” channels 1 … 12.
Autorotation
Autorotation is that state of descending flight in which
the pitch of main rotor blades are set such that the
rotor’s speed matches the natural forces of air flowing
through, like a windmill. The rotational energy stored
in the mass of the rotor by this process can then be
converted into upthrust by adjusting blade pitch, in
order to halt the descent and “rescue” the model.
Autorotation is a means by which real and model
helicopters are able to land safely in emergency situ-
ations, e. g. in the event of a motor failure. However,
the prerequisite for this is a well-trained pilot familiar
with the helicopter’s characteristics. Quick reaction
and good perceptiveness are necessary because
the rotor’s inertia can only be used once to generate
recovery lift.
When this technique is evaluated during competi-
tions, the motor must be switched off for autorotation.
On the other hand, for training mode it is advanta-
geous to keep the motor at idle for autorotation.
The Autorotation switch causes a switchover to the
autorotation flight phase in which control of “throttle”
and “pitch” are separate and all mixers which have
an effect on the throttle servo are switched off. Cor-
responding parameter settings are made in the »Heli-
copter mixer« (see text beginning page 188); refer
also to the “Principle of the Auto. C1 Pos.” topic which
follows.
The “Autorotation” name is permanently assigned to
this phase and it is included in the base screen and
the screens of all flight phase dependent menus. This
name can NOT be changed. It is only possible to as-
sign a switch to this option at the right of this display,
as described on page 68. If a switch is assigned,
it will have absolute priority over all other flight-
phase switches:
Base setup model
RF transmit ON
RF Range Test 99sec
DSC Output PPM10
Autorotation
–––
More about flight-phase programming can be found
in the text beginning on page 188 in the»Helicopter
mixer« section.
Autorotation C1 position
The autorotation flight-phase can alternatively be
activated by a threshold point for the C1 throttle/pitch
stick. To do this, use the  selection keys of the
left or right four-way button to move into the “Autorot.
C1-Pos.” line.
As soon as this display line has been selected, its
value field, located above the column label STO will
be framed.
Base setup model
RF Range Test 99sec
DSC Output PPM10
Autorotation
–––
Auto.C1 Pos.
–––
0%
STO
Move the C1 stick into the desired threshold switch-
over position then tap the center SET key of the right
four-way button. The current value will be displayed,
e. g.:
Base setup model
RF Range Test 99sec
DSC Output PPM10
Autorotation
–––
Auto.C1 Pos.
–––
–66%
STO
After this has been done, use the selection keys to
move into the column above the switch symbol then
assign a switch to this field, as described in section
“Physical control, switch and control switch assign-
ments” on page 68:
Base setup model
RF Range Test 99sec
DSC Output PPM10
Autorotation
–––
Auto.C1 Pos.
–66%
9
STO
Once this activation switch is closed, the first occur-
rence of a threshold underrun will cause the program
to switch over to “Autorotation” and then remain in-
dependent of C1 position in this flight phase until the
activating switch, in this example switch 4, is again
“OFF”.
“Autorot. C1-Pos.” has precedence over all other