GRAUPNER GR-18 Notice D'utilisation page 44

Swp direction
Default setting: 0
Here, the direction of rotation of the Swp servos is set so that the Swp does not tilt during pitching. Select the right set
ting from the options (pitch direction is set under K1 in the transmitter's servo menu, if required).
The direction of rotation of the swashplate is now monitored. If the model pitches upwards, the swashplate must move
upwards in parallel. If the swashplate is travelling in the opposite direction, the servo reverse setting must be applied in
the transmitter for the servo 1 settings and the roll and nick direction is set via the servo 2 and servo 3 servo reverse.
S1 mid, S2 mid and S3 mid
Default setting: 0
The swashplate should be aligned as far as possible at right angles to the main rotor axis. First, set the optimum
mechanical settings and then set up the 3 servos in the menu. The swashplate is set up perfectly when the helicopter
is able to hover on the spot.
Swp travel 7d
Default setting: +100
When the menu is activated, set the Swp cyclic travel to 7 degrees so that when the full roll command is applied (= 100%
travel in the transmitter servo display), the rotor blades generate a cyclic travel that is as close to +-7° as possible on
both sides. To do this, the field must be selected (highlighted) so that the swashplate can be controlled and adjusted
in direct mode when gyro gain is switched off. This is the only mode in which the travel can be set correctly. It is very
important that the travel is set correctly. It plays a major role in terms of acquiring the correct gyro gain. The setting
should therefore be made as accurately as possible using a digital pitch gauge.
Collective_A/B
Default setting: 100
It is selected automatically based on the pitch stick travel on the transmitter. Use the pitch gauge to measure the
required pitch travel when the full commands are applied (+-100%) and set it in this menu. All of the other settings can
be made later on the transmitter for the pitch curves in the respective flying phase.
Cyclic max
Default setting: +50
Swashplate limit. The swashplate limit must be set so that it is not possible for a servo to reach its mechanical limits,
while ensuring that the servo's travel is as large as possible. No humming should come from any of the servos when
full travel commands are applied.
Swp rotate
"Swp rotate" = a virtual Swp rotation (in degrees) can be set here (for certain systems with several blades).
The Swp (swashplate) is now fully set up and you can move on to the tail:
Tail servo
Tail servo: select the correct mid-point for your tail servo here.
Mid pulse width: 1.5 ms, 760 μs or 960 µs.
Default setting: 1.5 ms. 1.5 ms is generally the default setting for tail servos. Narrowband servos (generally special tail
rotor servos) may however require a different mid pulse width. You must locate this value in the servo manual and set
it correctly. If a value has not been specified, it is probably a standard servo set at 1.5 ms. If you have a DES, HVS or
HBS servo, this value can sometimes be programmed. However, we recommend sticking with the default setting.
Tail frequency
Tail frequency: the tail frequency can be set to between 50 and 333 Hz.
Default setting: 50 Hz
Warning: Analogue servos may only be operated at 50 Hz. If they are not, the servos will be destroyed.
Many digital servos can be operated at a higher frequency. (Use at your own risk). This allows the model to be
controlled more quickly. With HBS servos, we recommend setting the frequency to 333 Hz.
Tail mid
Default setting: 0
The tail servo arm should be at a 90-degree angle to the tail linkage pushrod.
The fine trim is then adjusted based on the mid-point of the tail. When the servo is set to neutral, the tail rotor should be
set to a pitch angle of approx. 2 to 3° against the torque at the tail rotor.
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