Техническая Спецификация для Graupner Hendheld RC 2.4 GHz No. of channels: 8 33116

Модели
33116
Скачать
Страница из 200
120 Program description: helicopter mixers – model helicopter
Adjusting the throttle and collective pitch curves
A practical procedure
Although the throttle and collective pitch control systems 
are based on separate servos, they are always operated 
in parallel by the throttle / collective pitch stick (except 
when auto-rotation is invoked). The Helicopter program 
automatically couples the functions in the required way. 
In the 
mx-16 HoTT program the trim lever of control 
function 1 only affects the throttle servo, i. e. it acts as 
idle trim (see “Digital trims” on page 58).
The process of adjusting “throttle” and collective pitch 
correctly, i. e. setting the motor’s power curve to match 
the collective pitch setting of the main rotor blades, 
is the most important aspect of setting up any model 
helicopter. The program of the 
mx-16 HoTT provides 
independent adjustment facilities for the throttle, collec-
tive pitch and torque compensation curves.
These curves can be defined using a maximum of five 
reference points. To define the control curves all you 
have to do is set individual values for these five points in 
order to determine each control curve.
However, before you set up the throttle / collective pitch 
function it is important to adjust the mechanical linkages 
to all the servos accurately, in accordance with the set-
up notes provided by the helicopter manufacturer.
Note:
The hover point should always be set to the centre 
position of the throttle / collective pitch stick.
Idle setting and throttle curve
Note:
Since electric power systems by their nature require no 
idle setting, it is not necessary to adjust the idle value. 
However, the matching of the throttle and collective pitch 
curve(s) must still be carried out as described here, in a 
similar way to a glow-powered helicopter.
The idle setting is adjusted solely using the trim lever 
of the Ch 1 function, with the throttle limiter closed, as 
described in detail on pages 99 to 100.
Reference point 1 of the throttle curve defines the throttle 
setting when the helicopter is in a descent, but without 
affecting the hover setting.
This is a case where you can exploit flight phase pro-
gramming to use different throttle curves. An increased 
system rotational speed below the hover point proves to 
be useful in certain circumstances; for example, for fast, 
steep landing approaches with greatly reduced collective 
pitch, and for aerobatics.
The diagram shows a curve with 
a slightly altered throttle setting 
below the hover point at the cen-
tre of stick travel.
+100%
0%
OUTPUT
2
3
4
5
1
Control travel
Different throttle curves are programmed for each flight 
phase, so that you can use the optimum set-up both for 
hovering and aerobatics:
Low system rotational speed with smooth, gentle 
control response and low noise at the hover.
Higher speed for aerobatics with motor power settings 
close to maximum. In this case the throttle curve also 
has to be adjusted in the hover range.
The basic set-up procedure
Although the 
mx-16 HoTT transmitter provides a 
broad range of adjustment for the collective pitch and 
throttle curves, it is essential that you first adjust all 
the mechanical linkages in the model according to the 
information supplied by the helicopter manufacturer, i. e. 
all the system linkages should already be approximately 
correct in mechanical terms. If you are not sure of how 
to do this, any experienced helicopter pilot will be glad to 
help you with the basic set-up.
The throttle linkage must be adjusted in such a way 
that the throttle is just at the “fully open” position at the 
full-throttle setting, or the speed controller of an electric 
helicopter is set to full-power. When the throttle limiter 
is at the idle position, the Ch 1 trim lever should just be 
able to close the throttle completely, without the servo 
striking its mechanical end-stop (quick throttle adjust-
ment using the “digital trim”: see page 58). With an 
electric helicopter the motor should stop reliably when 
the throttle limiter is closed.
Take your time, and carry out these adjustments very 
carefully by adjusting the mechanical linkage and / or 
changing the linkage point on the servo output arm or 
the throttle lever. Only when you are confident that all is 
well should you think about fine-tuning the throttle servo 
using the transmitter’s electronic facilities.
Caution:
Read all you can about motors and helicopters, so 
that you are aware of the inherent dangers and the 
cautionary measures required before you attempt to 
start the motor for the first time!
With the basic set-up completed, it should be possible to 
start the motor in accordance with the operating instruc-
tions supplied with it, and adjust the idle setting using 
the trim lever of the throttle / collective pitch stick. The 
idle position which you set is indicated in the transmit-
ter’s basic screen display by a horizontal bar in the 
display of the Ch 1 trim lever’s position. Refer to page 58