Operation Manual

ROYAL evo
Seite 26
Step
u
Setting up the throttle curve
The throttle curve is set up in the menu H Control,
Throttle (Î 14.2.10).
The purpose of setting up a throttle curve is to obtain
constant system rotational speed over the full range of
collective pitch. Stable flight handling can only be
achieved if this is the case. Fine-tuning can only be car-
ried out during actual test-flying.
!
Note for Throttle Limiter and Direct Throttle
The throttle limiter must be at the full-throttle position,
and the direct throttle switch must be set to OFF. Only
in this situation the collective pitch -> throttle mixer is
activated, and the throttle servo follows the movement
of the collective pitch stick in the ratio dictated by the
throttle curve you have set.
!
Note for helicopters with RPM control (NEW!)
(valid for software version 1.16 and higher)
In the menu , Properties the Throttle Curve can
be set to OFF. For helicopters with regulated rotation of
the main rotor in the menu H, Throttle only the Min.
value and one single point of the throttle curve must be
set (Î 14.2.11.).
Step
v
Setting up the tail rotor mixer
(static tail rotor compensation / REVO-
MIX)
The tail rotor mixer is set up in the menu G Mixer, TAIL
(Î 15.4).
In the model templates HELImech and HELIccpm tail
rotor compensation is switched off by default. If your
model is fitted with a modern gyro system which is
always operated in Heading Lock mode, you must set all
values for the TAIL mixer to OFF or 0%. An alternative is
to control the tail rotor directly using the Yaw function
instead of the TAIL mixer. To do this you need to change
the servo assignment (K menu, Servo/Assignment ->
16.2.) from TAIL to Yaw
If you are using a gyro system which is required to work
in normal or damping mode, the TAIL mixer should be
activated and set up carefully. This mixer prevents the
characteristic swing of the model around its vertical axis
when the torque level changes, and makes it easier for
the gyro to achieve optimum tail stabilisation.
This is the procedure for setting up tail rotor compensa-
tion:
1. Ensure that the servo output arm and the tail rotor
actuating arm are at right-angles to the tail rotor
pushrod when the tail rotor servo is at the neutral
position. If necessary adjust the length of the tail ro-
tor pushrod until this is the case. An accurate me-
chanical adjustment in this way automatically de-
fines a pre-set tail rotor setting which minimises the
helicopter’s tendency to swing when hovering.

TIP:
If you fold both tail rotor blades to one side, the dis-
tance between the blade tips should be around 10 -
20 mm; the actual figure varies with the model.
2. Now move the collective pitch stick to the position
at which the pitch angle of the main rotor blades is
0°. You can now set the correct starting point for
the tail rotor compensation mixer by transferring
the value of the Collective pitch parameter to the
Zero point parameter.
3. The level of tail rotor compensation for climb can
now be adjusted using the parameter Collective
pitch max. “Coll.+”.
Move the collective pitch stick to the Climb position
(collective pitch maximum), and set an initial value
which doubles the distance between the tail rotor
blade tips (when folded together as previously de-
scribed). Now move the collective pitch stick to the
Descend position (collective pitch minimum) and
set an initial value which reduces the distance be-
tween the tail rotor blade tips almost to 0 (approx. 5
mm).
For the other flight phases (apart from Auto-rotation) it
is safe to start by adopting the same values. Fine ad-
justment of tail rotor compensation (Collective pitch+,
Collective pitch-) for the various flight phases can only
be carried out during flight-testing.
In the flight phase Autorotation (AUTOROT) tail rotor
compensation is not needed, as the motor is switched
off or at idle in this phase, and produces no torque
which requires compensation. For this phase set a value
of OFF for the parameters Collective pitch+ and Collec-
tive pitch-. Set the Offset parameter to a value which
sets the blade tips of the (folded) tail rotor blades in a
line (= blade pitch angle 0°).
Step
w
Setting up and testing the gyro
The model templates are designed to reflect the fact
that most modellers nowadays use a standard gyro
system (normal/damping or heading lock) whose gain
(sensitivity) can be adjusted from the transmitter using
a separate channel.
In the ROYALevo
’s two model templates HELImech and
HELIccpm the default setting is the simplest method of
gyro gain control: the gyro mode Transmitter control
(Î 15.3). In this mode gyro gain is adjusted manually
using the transmitter control Gyro (slider E). If you wish
to assign a different transmitter control, this can be
done in the menu L Setup, Assignment (Î 13.3).
The first step is to establish the position of the transmit-
ter control which corresponds to maximum gyro gain.
This is done by moving the appropriate transmitter
control to one end-point, and moving the model a-
round its vertical axis. At maximum gain the corrective
travel of the tail rotor will be at a maximum. If maximum
gyro gain is obtained at the opposite position of the
transmitter control, you need to reverse the “direction
of rotation” of the gyro channel (Î 16.1.1).
The optimum gain setting for the gyro has to be estab-
lished with the model in flight. For the first few flights
we recommend a gain setting of around 50%. During
the first few test-flights increase gyro gain gradually
until the tail begins to oscillate. Now reduce the gain to
the point where the oscillation can just no longer be
detected. This is the optimum gyro gain setting.
!
Caution!
Before you fly the model it is essential to ensure that the
gyro is working correctly, i.e. that it is set up to counter-
act any rotational movement. If the gyro is set up incor-
rectly, it will amplify any tendency to swing, and the
helicopter will be uncontrollable. Please read the in-
structions supplied by the gyro manufacturer.
In addition to gain adjustment from the transmitter
control (gyro mode Transmitter control) the ROYALevo
offers further facilities for optimising gyro gain sepa-
rately for each flight phase.
(gyro modes Damping, Heading Î 15.3).
Step
W
Getting to know the method of working of
the throttle limiter and direct throttle