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The new digital gyro is specially designed for the RC helicopter.it is utilized the AVCS and is of high performance compact dimension and light weight.
1. Technical Features
1.1 Control system:Digital advanced PI(proportional interation)
1.2 Operating voltage: DC4-6v
1.5 Functions :reverse switch sensitivity trimmer, server travel adjustment. The gyro sensitivity adjustment and AVCS &normal model switch can be operated via the transmitter.
1.6 Functions: reverse switch, AVCS on/off switch, sensitivity trimmer, servo travel adjustment. The gyro sensitivity adjustment, and AVCS mode & normal mode switch can be operated via the transmitter.
2. Identifications and Functions
1.2 Reverse switch
Alter the gyro control direction
1.3 AVCS switch
Digital servo model switch. When the DS ON/OFF switch is switched to the ON position, the digital servo is activated: when the DS ON/OFF switch is switched to the OFF position, the traditional servo is activated Note: If the DS ON/OFF switch is switched to the ON position ,damage or burn maybe happen on the low watt servo.
1.4Control delay trimmer
The control delay trimmer is used to adjust the signal speed .If a slow-speed servo is used and found the hunting effect ,clockwise tunes the trimmer and increases the delay time to eliminate the effect, If a high-speed servo, such as a digital servo, is used, adjust the trimmer to 0.
1.5Gyro travel adjustment trimmer
Set the maximum travel of the rudder servo, Pull the rudder stick to the full left and right ends respectively and adjust the rudder servo travel within the maximum ranges of the tail rotor sleeve. Clockwise tuning the trimmer increases the rudder travel.
1.6Gyro sensitivity input trimmer
Connects to the receiver sensitivity input channel (usually AUX 2or AUX 3). The trimmer can be used to switch the gyro sensitivity and mode (AVCS mode and normal mode). Single core is easy to be broken and is forbidden to draw.
1.7 Rudder input connector
Rudder input connector connects to the rudder input channel of the receiver.
1.8 Rudder servo connector
Rudder input connector connects to the rudder servo.
Quick flash: the gyro is in the process of initialization when the power is turned on.
LED on: the gyro is in the AVCS mode.
LED off: the gyro is in the normal model or the power is turned off.
Flash twice: in the AVCS mode, the neutral position of the rudder servo current received signal is different from the neutral position which is previously saved in the gyro. Below are the situations of flash twice:
a. The rudder servo bellcrank is being adjusted:
b. The neutral position of the rudder servo has been drifted, and the neutral position has to be reset
3.0 Gyro Sensitivity Setting Via Transmitter
3.1 The relationship between the transmitter sensitivity setting value and the gyro sensitivity
When the receiver sensitivity channel sends the signal of neutral position, the gyro sensitivity value is 0.When the signal sent is above the neutral position ,the gyro is in the AVCS mode: when the signal sent is below the neutral position ,the gyro is in the normal mode. If the transmitter, is of gyro sensitivity adjustment function, the gyro sensitivity can be adjusted via the GYRO function in the transmitter: if the value is set at 50%, the gyro sensitivity is 0.If the value is set at 0-50%, the gyro sensitivity is ranged from 100% to 0% (normal mode): if the value is set at 50-100%, the gyro sensitivity is ranged from 0 to 100% (AVCS mode). The transmitter sensitivity switch can simultaneously control over the gyro sensitivity and operation mode. The ATV value of the transmitter sensitivity switch can also take control of the gyro sensitivity. When the ATV is at 90%, for example, the gyro sensitivity is 100%.
3.2 The gyro sensitivity setting via the transmitter sensitivity switch
4.0 Use Method
4.1 Mounting to the fuselage
Be careful when operating the switch and trimmer, because a small switch and trimmer are used. Always operate the switch and trimmer with the mini screw driver . When mounting the XMHOBBIES gyro to the helicopter gyro bed, please use the double adhesive tape ,At the same time, please check the bottom of the gyro body is perpendicular to the main shaft of your helicopter. When used with a motor helicopter, mount the XMHOBBIES gyro at least 10 cm away from the drive motor.
4.2 Wiring diagram
4.3 Servo selection
While using the digital servo as the rudder servo, switch the DS ON/OFF switch to the ON position. While using the traditional servo
as the rudder servo, switch the DS ON/OFF switch to the OFF position. Note: when using a traditional servo and switching the DS
ON/OFF switch to the ON position, damage or even burn may happen on the Iow watt servo.
4.4 Inspect the rudder bellcrank
Switch the gyro AVCS switch to the normal mode. Turn on the transmitter power and then turn on the receiver power. Don't move
the servo bellcrank or the helicopter for about 3 seconds because the gyro is initializing. LED will intermittently flash. When the
rudder servo is in neutral position, it must be linked at a position to which the servo bellcrank and servo push rod are perpendicular.
Adjust the length of the rudder servo bellcrank in accordance with the helicopter manual. Try moving the rudder stick to the left and right,
and check the direction of the rudder servo operation. If the rudder servo moves in the opposite
direction, use the transmitter reverse
function to reverse it.
Note: if the rudder revolution mixing function is activated, put the throttle stick at the neutral position when setting the neutral position
at initialization. For the safety purpose, when setting the motor, turn off the motor power or switch off the rudder revolution mixing
function, and set the value to zero.
4.5 Gyro sensitivity adjustment
The gyro sensitivity depends on the rudder servo and helicopter. In principle, the faster the rudder servo speed is, the higher the
gyro sensitivity has to be set. The faster the main rotor blade rotation is, the higher the rudder servo sensitivity has to be increased.
So adjusting the gyro sensitivity is a must. For example, the sensitivity for the aerobatic maneuvers (ST-l, ST-2) must be lower than
that at hovering flight. Set the gyro sensitivity trimmer to the approximately 60 - 70% for aerobatic maneuver, and 70 - 80% for
4.6 Inspection of the gyro operation direction
Lift off and hover the helicopter, and shake the helicopter head leftward. The drift direction of the rudder servo should be same
with the rudder stick of the transmitter, which moves rightward. Otherwise, reverse the reverse switch in the gyro. Note: if
setting the gyro operation direction wrong, the helicopter will auto rotate at high speed and result in serious danger!
4.7 Adjustment of rudder servo travel
Pull the rudder stick to the full left and right ends respectively and adjust the rudder servo travel within the maximum ranges of the
tail rotor sleeve. During flight, the rudder servo movement is within the maximum travel and protect the servo and its bellcrank. Don't
set the rudder servo travel too narrow to decrease the gyro