Pit>>Tail - GRAUPNER mz-24 Pro Programming Manual

PIT>>TAIL
Phase-Dependent Static Torque Compensation
Use this function to adjust the torque compensation
curve with a linear mixer ratio. In normal flight, the tail
rotor is adjusted so that it compensates for the torque
of the main rotor during hovering. This generates a
certain amount of thrust in home position. This thrust
is then varied by the tail rotor control and different
mixers for all types of torque compensation and is ad-
justed by trimming the tail rotor to accommodate the
weather, system speed and other influences.
To adjust these settings, from the main display press
the FUNCTION menu gear icon (blue "F") to bring up
the FUNCTION submenu screen:
000%
000:00.0
000 000
mz
000:00.0
0:01:23
Press
M - 3
000 000
PHASE 1
Starlet
BATT TIME 00: 01: 23
000
From the FUNCTION submenu display, press the
PIT>>TAIL icon:
BACK BASE FUNCTION
Phase D/R,EXP PIT.CRV THR.CRV
Press
THR.HOLD Swash S.Limit S.MIX
Prog.MIX Trainer PIT>>TAIL Logical sw
Phase-Dependent Settings
This submenu allows for different phase-specific val-
ues to be programmed. Phase names are displayed
in green in the upper left side of the screen next to
the BACK button. Standard default naming for the
phases are usually displayed as NORMAL/PHASE
1. (Additional phases will be named numerically, e.g.
Phase 2, Phase 3, etc.) To define multiple phases,
178 Function menu | Helicopter model - Pitch >> Yaw
refer to the FUNCTION submenu Phase section (page
120). Each new phase will need to be assigned to
a different switch. To change the phases, activate
the corresponding switch(es).A torque compensation
curve with a linear mixer ratio of 0% is uniformly set
by default which is necessary for gyro sensors that
operate in heading-lock mode:
000%
4.2V
If using the gyro sensor in NORMAL mode, or if the
sensor can only handle NORMAL mode, adjust the
mixer as follows:
Notice
000
Consult the gyro setting instructions to avoid
making adjustments that may make it impossible
to fly the helicopter.
SYSTEM
Programming
Similar to adjusting the PIT.CRV (page 154), the con-
Gyr/Gover
trol curve for the tail rotor can also be defined with up
to 7 points. Modify the mixer as needed and at any
THR.MIX
time by specifying the symmetrical and asymmetrical
mixer ratios above and below the hovering point.
Sequence
Starting with -30% at point L and +30% at point H,
adjust the mixer so that the helicopter does not have
differing main rotor torque compared to hovering.
This will prevent the helicopter from rotating around
the vertical axis, even during long vertical ascents and
descents.
BACK PHASE 1 PIT>>TAIL SERVO
OFF
Curve
IN –100% INC
OUT 000%
POINT L DEC
000%
ST OFF X-axis Y-axix ENT
Change the trim using the digital tail rotor trim control
while the helicopter is hovering:
BACK PHASE 1 PIT>>TAIL
Curve OFF
IN +100%
OUT +030%
POINT H +030%
ST OFF X-axis Y-axis
In order to reliably adjust the torque compensation,
the pitch and throttle curves must be correctly adjust-
ed; in other words, the speed must remain constant
over the entire collective pitch adjustment range.
Autorotation setting
During autorotation, the main rotor is not driven by
the motor but according to the windmill principle. In
this context, there is no torque that the tail rotor must
compensate for. Therefore, all of the corresponding
mixers are automatically turned off.
Since thrust is no longer necessary during autorota-
tion (because of the lack of torque), the basic position
of the tail rotor must also be different:
While the motor is turned off, place the helicopter
in a horizontal position. Turn on the transmitter and
receiver, select the phase autorotation, fold down
the tail rotor blades, and change the mixer settings
until the pitch angle of the tail rotor blades equals
0°. The tail rotor blades are then parallel with each
other when viewed from the rear.
Depending on the friction and operating resistance
of the gearing, the fuselage may still rotate slightly.
This relatively slight torque should then be correct-
ed using the tail rotor blade pitch angle. This value
should be between 0° and a pitch angle that is op-
posite the direction of the pitch angle during flight.
SERVO
INC
DEC
ENT