GRAUPNER mz-24 Pro Programming Manual page 162

Since the throttle curve only determines the target
speed of the motor control unit, and this target speed
normally remains constant over the entire pitch ad-
justment range, set a horizontal line in the FUNCTION
submenu THR.CRV. Each input value (pitch) results
in the same output value (throttle) whose level deter-
mines the target speed.
To set the horizontal line, delete any previously set
support points (1 - 5). Then set the support points
L (input = 0%) and H (input = +100%) to the same
value, as shown below:
BACK PHASE 1 THR.CRV
THR.Limit OFF
OFF
Curve
IN +100%
OUT +075%
POINT H
+075%
ST ON X-axis Y-axis
The value to be set depends on the governor that is
used as well as the desired target speed. This can be
varied for specific phases.
Tip
After setting up a programmable mixer, the implement-
ed governor function can be trimmed phase specifically.
Press one of the two digital-trim buttons (D.TRIM) within
a maximum of ±37,5 %. Refer to the Programming
Example (page 233). This options allows phase-specif-
ic governor trim to be corrected using only one control
element.
162 Function menu | Helicopter model - Throttle curve
Notice
If the throttle curve is used to control a governor,
all the mixers programmed in the FUNCTION
submenu THR.MIX (page 176) must be left
on INH .
Throttle/Pitch Curve Adjustment
The most important setting for helicopters is the co-
ordination of throttle and pitch (i.e., the performance
curve of the motor with collective blade adjustment).
The mz-24 Pro transmitter allows the throttle, pitch
and torque compensating curves to be independently
SERVO
adjusted. Throttle and pitch control are always acti-
TRIM
vated by separate servos activated together by the
throttle/pitch control stick (except in the autorotation
INC
phase). The helicopter program automatically couples
the servos. The trim lever for Control Function 1 acts
DEC
only on the throttle servo.
ENT
These curves can be specified by up to 7 points
(termed "support points") along the entire control
stick travel. During initial setup, fewer support points
are required to set a pitch curve. However, it is rec-
ommended to start with at least three support points.
These three endpoints describe the linear character-
istic of a pitch control curve: the two endpoints Pitch
low (L = -100% control travel) and Pitch high (H =
+100% control travel) and the control (placed in the
center).
Before adjusting the throttle and pitch function, all
servo linkage must first be mechanically pre-adjust-
ed according to the helicopter's adjusting instructions.
Notice
The hovering point should always be in the center
position of the throttle/pitch control stick. In spe-
cial cases, for example for 3-D flight, deviating
hovering points can be programmed: a point for the nor-
mal flight position above the center, and a point for in-
verted flight below the center.
Throttle Curve Idle Setting
Notice
Electric drives do not require an idle setting,
therefore, an idle adjustment is unnecessary with
this type of drive. However, the synchronization
of the throttle and pitch curve(s) described here is similar
to gas helicopters.
The Idle Setting (page 95), is done exclusively when
the throttle limiter is closed. It is normally performed
with the trim control of the CH1 function (and in spe-
cial cases in conjunction with the throttle limiter).
Programming a corresponding value at the L point of
the throttle curve adjusts the descent speed of the
motor without influencing the hovering setting.
For example, use the phase programming to set dif-
ferent throttle curves. This higher system speed below
the hovering point is useful for fast, steep landing ap-
proaches when the pitch is very low. It is also useful
in performing aerobatics.
The figure shows a curve with a throttle
position that changes slightly below the
hovering point in the control center.
Control travel