iKarus Profi Gyro Guide Rapide page 3

www.ikarus.net
The new Profi Gyro is the improved RC - helicopter gyro, developed on the
basis of the well-known and reliable Ikarus gyro family.
In a helicopter the gyro stabilizes the model about its vertical axis against
external disturbances caused by wind and torque fluctuations of the drive.
The Profi Gyro contains no wear susceptible moving parts, it works always
reliable and without wear on pure electronic basis.
Application
Tail rotor control
Properties of the Profi Gyro
- high holding power
- switchable from normal to heading lock operation
- internal stick authority system (also "stick priority")
- remote adjustable gyro/heading lock sensitivity
- basic sensitivity adjustment by potentiometer
- jumper for servo reversal
- after switching-on automatic temperature self
calibration
- control LED
- operating voltage range + 4.4... 12 V
- temperature range 32...122°F
- weight approx. 0.8 oz.
- outside dimensions approx. 1.5" x 1.6" x 0.7"
- fine adjustment via PC interface and interface cable
(optional)
The Profi Gyro can work in 2 different operational modes:
1.) Conventional (normal) gyro mode.
2.) Holding mode (Heading Lock Mode).
The mode switching is accomplished via the sensitivity channel or, if no
channel available, by a jumper directly on the gyro. The selected mode
can be recognized as follows: Under normal mode conditions the servo
arm returns after a short command with the joystick or after rotation of the
gyro immediately back to its original position, in the Heading Lock Mode
the servo remains in its new position after the joystick has been released
or the gyro rotation has stopped. If in the holding mode the stick channel
is not properly trimmed (neutral position 1.5 ms) the servo arm will slowly
or even faster drift towards one of its end positions.Under normal mode
the gyro works like conventional gyro systems, that is it immediately
counteracts disturbances caused for instance by wind gusts. In the
Heading Lock Mode (heading hold system) the gyro tries to hold the
heading of the longitudinal axis determined by the pilot by nearly fully
adopting the tail rotor control. Hence when hovering the beginner must not
additionally concentrate on tail rotor control. A professional pilot can for
instance fly in gusty weather fast back-wards without the helicopter
turning immediately into wind direction.
100%
Holding mode
1.1ms
Impuls length of sensitivity channel
Stick Authority System
The Wing Gyro comprises an internal automatic stick authority system,
that is the gyroscopic effect is highest at stick neutral position and
decreases gradually when the stick deflection approaches maximum (also
called "stick priority"). Any contingent stick authority system on the
transmitter (ATV) must be switched off.
Normal mode
1.5ms
1.9ms
Norbert Grüntjens
Connectors
To receiver
Tail rotor connector
Installation and Wiring
Choose a position away from heat and vibration. Stick the gyro with a double
sided foam tape to a smooth surface. The cables of motor, speed controler
and battery should be routed as far away as possible of the Profi Gyro . The
gyro axis of rotation must be positioned parallel to the vertical axis (main rotor
axis), the direction of rotation is irrelevant (see figure). Connect the tail rotor
gyro connector to the selected tail rotor channel output of your receiver. If you
intend to utilize the remote sensitivity adjustment, plug the gyro sensitivity
connector into a receiver output. If there is no further channel left for remote
sensitivity control just leave the connector open. In that case the gyro will
work with the sensitivity which has been adjusted by potentiometer
(approximate gyro effect range between 30% and 100%).
If your gyro works in the remote adjustment mode you must not forget that the
sensitivity range will also be influenced by servo travel limit adjustments of
your transmitter on the given gyro channel. If you want a regular operational
behaviour a pulse length range of 1.1 to 1.9 milliseconds and a neutral pulse
of 1.5 milliseconds must be available, that corresponds on JR radios to a
servo travel of 100/100%, otherways you will not be able to achieve full
remote controlled sensitivity adjustments of whole 100% or 0%.
Connections to PCM receivers
Into PCM- receivers the gyro must be plugged according to the
recommondation of the receiver's manufacturer. For example, plug the
gyro's connector "rudder channel" into receiver channel 2, and plug the
gyro's sensitivity connector into receiver channel 5 or 7. If the gyro's LED
starts flashing after connecting to a PCM receiver the channel wiring is wrong
and has to be changed. As long as the LED is flashing, only poor gyro effect
is achieved.
3
2
1
Initial Operation/Function Test
Put the tail servo stick and its trim tab into neutral position. Leave the
sensitivity input of the gyro open or deflect the relevant stick to its end
position (pulse length 1.9 ms), that is operate the gyro in normal mode at its
full sensitivity.
Now switch on the transmitter and subsequently the receiver power supply.
The Profi Gyro will now carry out the automatic temperature calibration.
During this process the gyro must not be moved. After termination of the
calibration (approx. 3 - 5 sec.) the LED lights up permanently and the
connected tail servo executes a short twitch. The gyro is now ready for
operation.
In the conventional gyro mode the servo now reacts to angular movements of
the helicopter about the axis of rotation of the gyro with corresponding
counter-movements of the servo, while steering commands of the tail servo
stick are correspondingly obeyed by the servo.
Between disconnection of the receiver power supply and repeated
switching-on you should pause for at least 10 sec. The gyro should not be
exposed to violent temperature fluctuations; you can give rise to a repeated
Profi Gyro
# 720613
Profi Gyro
Maximum sensitivity
Control LED
Servo reversal
Servo
Holding mode on/off
PC
To receiver
Sensitivity connector
Corrective axis
Servo
720613-0203