ROBBE Taurus 50 Notice De Montage page 7

connect the pushrod to a different linkage hole on the servo
output arm.
Final checks
When all the servos are at neutral, the output arm of the „Roll"
servo should be horizontal, those of the „pitch-axis" and „tail
rotor" servos vertical.
At this setting the pitch angle of the main rotor blades should
be +5°.
Maximum collective pitch should be around +10°, minimum
collective pitch around -4°.
Adjusting blade tracking, (sketch 2)
Caution: keep a safe distance away from the model (min. 5 m)
when checking blade tracking.
Remove the blue cap on the main rotor head marked
„Remove".
When you first operate the model you will need to check and
adjust blade tracking.
Carefully open the throttle until the blades are spinning, and
check the blade tracking from the side.
If the blades revolve at different heights when the rotor is at
hover speed, you need either to increase the pitch angle of the
lower blade B, or reduce the pitch angle of the higher blade A.
This adjustment is made by disconnecting the ball-link from
the mixer lever to the swashplate, and adjusting it by 1 or 2
turns in the appropriate direction.
General information on programming the radio control
system
If a model helicopter is to work efficiently it is essential that the
basic mechanical adjustments are carried out accurately.
The final stage is to fine-tune the system programming; for this
the following requirements must be fulfilled:
- The motor must be adjusted so that it runs smoothly and
with complete reliability over its full speed range.
- The available range of collective pitch must be from -4° to
around +10°.
The first adjustment is the hover point.
The aim is that the helicopter should hover at the centre point
of the collective pitch stick, corresponding to a main rotor
blade pitch angle of 5° and the appropriate rotor speed.
Slowly advance the collective pitch / throttle stick from idle
towards throttle centre.
If the helicopter lifts off before the stick reaches the centre
position, the centre area of the throttle curve should be
lowered. See Throttle Curve G 1.
If the helicopter does not lift off until the stick has passed the
centre position, the centre area of the throttle curve should be
raised. See Throttle Curve G 2.
Throttle curves
Gaskurve = Throttle curve
linear = linear
Servoweg = Servo travel
Taurus 50
Knüppelweg = Stick travel
The next step is to set the collective pitch „maximum" value.
The aim here is to maintain a constant rotor speed over the full
range of collective pitch.
This is necessary to ensure that the gyro and tail rotor
compensation functions work as efficiently as possible.
Adjust the maximum value for collective pitch using the
Collective Pitch Curve facility, to the point where rotor speed
does not decline at maximum throttle.
Starting from a stable hover, slowly advance the stick to the
full-throttle position. If rotor speed falls off towards full-
throttle, maximum collective pitch must be reduced until a
variation in rotor speed can no longer be detected. Curve P 1.
Pitch curve
Pitchkurve = Collective pitch curve
linear = linear
Servoweg = Servo travel
Knüppelweg = Stick travel
Tail rotor compensation (REVO)
Tail rotor compensation only needs to be activated if you are
using a gyro which requires this.
The aim is to eliminate any tendency for the helicopter to yaw
(swing to either side) when the model climbs or descends.
This unwanted rotation is caused by variations in the torque
generated by the rotor blades.
The basic requirement:
The helicopter must first be trimmed for a neutral hover, i.e.
when hovering the model should have no tendency to yaw.
Standard REVO value: 25%.
With the model at a steady hover, increase collective pitch
briskly.
If the model yaws in the opposite direction to the direction of
main rotor rotation, the value for tail rotor compensation
(REVO) must be increased.
If the model yaws in the same direction as the direction of
main rotor rotation, the value for tail rotor compensation
(REVO) must be reduced.
Idle-up 1
The purpose of this function is to raise the rotor's rotational
speed in the lower range of collective pitch. This means that
manoeuvres involving negative collective pitch values can be
flown without pulling the throttle setting back to idle.
Standard values are:
Idle up 1 approx. 30%
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