54
Meaning and application of “throttle limit”
In contrast to fi xed-wing models, the power output of
the engine or motor of a model helicopter is not cont-
rolled directly using the throttle (C1) stick. Instead it is
controlled indirectly by the throttle curve settings which
you set up in the »
Heli mixer
« menu. It is even possible
to set different throttle curves to suit different stages of
fl ight using fl ight phase programming.
Note:
If your helicopter is fi tted with a speed governor, this
controls the power output.
However, this certainly means that a helicopter’s motor
never gets anywhere near its idle speed during “normal”
fl ying, so it is impossible to start or stop the motor easi-
ly unless some other means is used. This applies whe-
ther a speed governor or a conventional throttle control
system is in use.
That is the reason why the “Lim” (limit) input is reser-
ved in the Helicopter program for the “Throttle limit” func-
tion. A separate transmitter control – as standard this is
the rotary proportional control CTRL 7 at top left of the
transmitter – is employed to limit the setting of the thrott-
le servo to any speed you like, which means that you
can throttle right back to the idle position for starting the
motor. The throttle servo can only follow the throttle cur-
ve, and therefore reach its full-throttle setting, if you re-
lease full servo travel using the throttle limit control.
For this reason the right-hand positive value in the “Tra-
vel” column must be large enough to ensure that it does
Control settings – Model helicopter
Throttle limit function
„Lim“ input
not limit the full-throttle setting available via the C1 stick
when the control is at its maximum position. Usually this
means a value in the range 100% to 125%. The left-
hand negative value of the input should be set in such a
way that the throttle is closed completely when the digi-
tal C1 trim is used, so that you can reliably stop the mo-
tor. For the same reason you should leave the bottom
value of the throttle limit slider at +100%.
This variable “limiting” of throttle travel provides a conve-
nient means of starting and stopping the motor. Howe-
ver, it also forms an effective method of recording fl ight
times via the control switch G3, if the latter is set clo-
se to the full-throttle point. The throttle limiter function
also provides an additional level of safety if, for examp-
le, you have to carry your helicopter to the fl ight line with
the motor running: you simply move the control to its mi-
nimum position, and this prevents any accidental move-
ment of the C1 stick affecting the throttle servo.
If the carburettor is too far open when you switch the
transmitter on, you will hear an audible warning, and the
screen displays the message:
throttle
too
high !
Important note:
Setting the “Lim” function input to “free” does not
switch off the Throttle limit function; it just switches
the limiter to “half-throttle”.
Tip:
You can call up the »
Servo display
« menu to check the
infl uence of the throttle limit slider. Move to this menu by
pressing the
SELECT
button from the basic transmit-
ter display. Bear in mind that servo output 6 controls the
throttle servo on the mx-16s.
„Gyro“
If the gyro you are using features infi nitely variable gain
control, then you can pre-set the gyro effect within the
range +/-125%, separately for each fl ight phase, in the
“Gyro” line of the »
Heli mixer
« menu – see the section
starting on page 66.
Once you have entered these pre-defi ned gain settings
(set separately for each fl ight phase in the »
Heli mixer
«
menu), you can use a transmitter control such as one of
the two INC / DEC buttons (CTRL 5 or 6) to vary gyro
gain; all you have to do is assign that transmitter cont-
rol in the “Gyro” line of this menu: in the centre position
of the transmitter control this corresponds to the setting
selected in the »
Heli mixer
« menu (see page 66). If the
transmitter control is moved from this centre point in the
direction of full travel, gyro gain is increased; towards
the opposite end-point it is reduced. This is a fast, simp-
le method of fi ne-tuning gyro gain when the model is in
fl ight – perhaps to suit varying weather conditions – or
alternatively to fi nd the optimum setting.
In software terms you can also limit the gain range to
both sides by restricting the transmitter control travel.
Summary of Contents for MX-16S
Page 1: ...1...
Page 17: ...17...
Page 31: ...31 Fixed wing models Installation and connections...
Page 35: ...35 Program description Reserving a new memory...
Page 47: ...47 Base settings Model helicopter...
Page 83: ...83 Fail safe...
Page 89: ...89 Programming examples Fixed wing model...
Page 109: ...109 Programming examples Model helicopter...
Page 112: ...112 112...
Page 116: ...116...
