User manual

Adjusting the throttle and pitch curve
The throttle and collective pitch control are always
activated by separate servos which, however, are
always activated together by the throttle/pitch control
stick (except in the autorotation Quick Link). The
helicopter program automatically couples the servos.
The trim lever for control function 1 in principle only acts
on the throttle servo of the mz-18 HoTT and mz-24
HoTT transmitter programs.
The coordination of throttle and pitch, i.e., the perfor-
mance curve of the motor with collective blade adjust-
ment is the most important setting for helicopters. The
mz-18 HoTT and mz-24 HoTT transmitter programs
allow the throttle, pitch and torque compensating curves
to be independently adjusted.
These curves can be characterized with up to seven
points, but generally fewer points are sufficient. It is
strongly recommended to first start with 3-point curves.
Individual values can be entered for the center position
and any other support points, as well as for the two end
positions ("L" ("low") and "H" ("high")) of the throttle/
pitch control stick which establish the control curves.
Before adjusting the throttle and pitch function, the
linkage of all servos must be first correctly pre-
adjusted mechanically according to the helicopter's
adjusting instructions.
Remark:
The hovering point should always be in the
center position of the throttle/pitch control
stick. In special cases, for example for 3-D
flight, deviating hovering points can also be
programmed, for example a point for the normal
flight position above the center, and a point for
inverted flight below the center.
Idle setting and throttle curve
Note:
Since electric drives do not require an idle
setting, an idle adjustment is unnecessary
with this type of drive. The coordination of the
throttle and pitch curve(s) described here is similar to
gas helicopters, however.
The idle adjustment, described in detail on page 94,
is done exclusively when the throttle limiter is closed,
normally with the trim lever of the CH1 function, and
only in special cases with the throttle limiter as well.
Programming a corresponding value at the "L" point
of the throttle curve adjusts the descent speed of the
motor without influencing the hovering setting.
You can use the Quick Link programming, for example,
to set different throttle curves. This higher system speed
below the hovering point is useful for example in fast,
steep landing approaches when the pitch is very low,
and in aerobatics.
The figure shows a curve with
a throttle position that changes
slightly below the hovering point
in the control center.
+100%
-100%
OUTPUT
2 3 4 51
Control travel
Different throttle curves depending on the Quick Link
are programmed for optimum adjustment for hovering
and aerobatics:
• A lower system speed with smooth, soft control
reactions and less noise while hovering.
• A higher rotor speed for aerobatics at the maximum
motor output. In this case, the throttle curve needs to
be adapted within the hovering range as well.
Basic settings
Although the pitch and throttle curves in the mz-18
HoTT and mz-24 HoTT transmitters can be electroni-
cally adjusted over a wide range, all the linkages in the
model must be correctly adjusted mechanically accord-
ing to the helicopter instructions. Experienced helicopter
pilots will in all likelihood be glad to help you with the
basic settings.
The carburettor control must be adjusted so that the
throttle is completely open at the maximum pitch posi-
tion, or the motor control unit of an electric helicopter is
at full power. When the throttle limiter is closed, the car-
burettor must also be able to be completely closed with
the CH1 trim lever, and the servo may not mechanically
overtravel. The motor control unit must reliably switch off
the electric power when the throttle limiter of an electric
helicopter is closed.
Perform these settings are very carefully by correspond-
ingly adapting the control linkage and/or changing the
articulation point on the servo or carburettor arm. Only
after this is done should the throttle servo be finely
adjusted electronically.
NOTE:
Before you start the motor the first time,
become familiar with the dangers and
precautions involved in handling motors
and helicopters.
After these basic settings are made, the motor should
be started according to the motor operating instructions,
and the idling can be adjusted using the trim lever of
the throttle/pitch control stick. The idling position that
you set is displayed in the transmitter's basic display by
a horizontal bar in the position display of the CH1 trim
lever.
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Helicopter model function menu - THR.CRV
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