Multiplex ROYALevo 7 Manual De Instrucciones página 287

ROYAL evo 7
AUTOROT
with collective pitch range –8 ... + 12 , providing the
optimum blade settings for collective pitch minimum
and maximum for auto-rotation landings.
TIP:
In our experience the correct blade pitch angle for hov-
ering is around +5°, although this does vary from model
to model. When setting up the collective pitch curves
you should ensure that this value is reached at ap-
proximately the same collective pitch stick position in
all the collective pitch curves, otherwise the model will
"jump" when you switch from one flight phase to an-
other.
!
Note: Models with CCPM swashplate
Do not set the collective pitch curve points P1 and P6
to + and - 100%, otherwise symmetrical cyclic move-
ments (pitch-axis and roll) will not be possible at maxi-
mum and minimum collective pitch, since the servos
will already be at the limit of their travel ( P1 and P5 ).
Depending on the travels for roll and pitch-axis, we re-
commend setting the max. and min. collective pitch
curve points P1 and P6 to around 70 to 80%.
!
Note: Altering the neutral position
If the system is to work correctly it is essential that you
set up the neutral position of the collective pitch trans-
mitter control to suit your preference as a pilot:
Collective pitch minimum forward or back
This setting can be changed in Menu L Setup , Con-
trol (
13.3.3.).
Step Setting up the throttle curve
The throttle curve ( P1 ... P5 ) is set up in Menu H Con-
trol / Throttle (
14.1.11.).
In model helicopters the throttle servo, or the electric
motor speed controller, is not controlled directly by a
transmitter control, but by the collective pitch stick via a
mixer (collective pitch
the collective pitch stick on the throttle servo / electric
motor is determined by the throttle curve. The aim of
the throttle curve is to obtain constant rotational speed
over the full range of collective pitch, i.e. for every col-
lective pitch stick position. Only then is it possible to
achieve stable flying characteristics with a helicopter.
The throttle curves for the model templates HELImech
and HELIccpm are set up by default, and it is only pos-
sible to fine-tune them when the model is flying.
!
Note: Throttle limiter and direct throttle
The throttle limiter (F) must be left at the full-throttle
position, and the direct throttle switch DTC (N) must be
set to "0" (= OFF). Only then is the collective pitch
throttle mixer active, and the throttle servo / electric
motor responds to the collective pitch stick according
to the throttle curve you have set up.
!
Note:
Electric helicopters with brushless motor used in
"regulator" (governor) mode
If you are using a speed controller for a brushless elec-
tric motor with "regulator" (speed governor) mode, a
throttle curve is not required. Instead a nominal rota-
tional speed has to be defined, as the speed controller
automatically holds the speed at the pre-set nominal
throttle mixer). The effect of
speed. The Throttle curve can be switched OFF in
Memory / Properties (
the menu
All the throttle curve points ( P1 ... P5 ) then have the
same value (fixed value). Any changes to one point af-
fect all the throttle curve points.
Setting the idle speed
The Min. parameter is used to set the motor's idle
speed when the throttle limiter is at the Idle position.
The idle speed can be fine-tuned using the idle trim
(trim buttons for the collective pitch stick). An idle
speed is not required for electric helicopters. In this case
set the value for Min. to 0% and the trim to minimum,
so that the motor is stopped when the throttle limiter is
at the idle position.
Step Setting up the tail rotor mixer
(static tail rotor compensation / REVO-
MIX)
The tail rotor mixer is set up in Menu G Mixer / TAIL
( 15.7.).
In the model templates HELImech and HELIccpm tail
rotor compensation is switched off by default. If you are
using a modern gyro system in your helicopter which
only operates in heading-hold mode, all the settings for
the TAIL mixer must be set to OFF or 0% (but please
read the notes on this in the instructions supplied with
the gyro system!).
TIP:
The alternative is not to connect the tail rotor to the re-
ceiver output TAIL , but to control the tail rotor directly
using the yaw stick, without a mixer. To achieve this you
must assign Yaw to a free channel in Menu K Servo /
Assignment (
16.2.). The tail rotor servo or gyro can
then be connected to this channel.
If your gyro system can work in normal or damping
mode, the TAIL mixer should be activated and set up
correctly, as it reduces the characteristic tendency for
the model to yaw (rotate around the vertical axis) when
there is a torque change, i.e. every time the pilot applies
a collective pitch command. This eases the workload of
the gyro, and ensures optimum tail stabilisation.
This is the procedure for setting up tail rotor compen-
sation:
1. Ensure that the servo output arm and the tail rotor
pitch lever are at right-angles to the tail rotor push-
rod when the tail rotor servo is at neutral. If neces-
sary, adjust the length of the tail rotor pushrod to
achieve this. At this setting tail rotor compensation
will be automatically close to correct for hovering.
TIP:
When both tail rotor blades are folded to one side,
the distance between the blade tips should be in
the range 10 - 20 mm, depending on the model.
2. Now define the starting point for the tail rotor
compensation mixer: move the collective pitch stick
to the appropriate position (hover point) and trans-
fer the value of the Collective pitch parame-
ter to the Zero point parameter ( Zero point
parameter 15.7.4.).
Page 56
18.5.4.).