A500-G Head Lock Gyro FAQ
Question 1 :
How to set the Transmitter and Gyro to the correct directions ?
Usually, a helicopter's head direction controlled by rudder servo's motion (it controls the rudder rotor blades direction). This motion is combined by two actions; you move stick and gyro's correction. So when you finish your helicopter assembly, firstly you need to check if these two actions work in properly directions.
1. The rudder stick on transmitter : It controls the helicopter's head direction. It is controlled by yourself. So for example, if you move stick to right (i.e. you want your helicopter head turn right), then you to inspect the tail rotor blade, it needs turn to the correct direction ( correct direction means when it starts rotation will force the wind blow to right, so the helicopter tail move to left, then its head turn to right). If direction correctly, your transmitter setting is OK. But if direction opposite, then need to change your transmitter's setting(change the direction of rudder channel from normal to reverse, vice versa).
2. The correction actions of Gyro : This action just controlled by Gyro itself, not by yourself. For example, you can image when you flying your helicopter, suddenly have a cross wind push your helicopter's head turn to right (i.e. helicopter's tail turn to left). In this time Gyro will send a signal to rudder servo to change rudder's blades direction to force heli's tail go back to original position. This action seem like you move your stick on transmitter to left, so you can simulate this action by your hand to shift the helicopter tail form right to left and inspect the rudder servo(or rudder blade) if move to the correct direction? (For safety issue, before you do this test please remove your main rotor blades firstly, and lowest down your throttle stick on your transmitter). If direction correctly, the gyro setting is ok. But if it opposite, then you need to switch the normal/reverse setting on your gyro (some kinds of gyro has no this switch, you can up side down to install the gyro on your helicopter).
Above mentions are general rules for helicopter rudder adjustment. No matter what kinds of helicopter, gyro, servo, transmitter you using. So these rules can fit for A500 or other brands gyro as an after-installed check procedure.
Question 2 :
When my helicopter just takes off from earth, why it always spin in one of directions and out of control ?
You installed your Gyro on the wrong direction. You can change direction by the switch 2 on the Gyro or up side down your Gyro by 180 degrees.
Question 3 :
Why this A500-G Gyro need to do calibration ?
Normally, the Gyro sensor in the gyroscope is a temperature sensitive device. Its output current is affected by environmental temperature. So this A-500G Gyro build-in a calibration procedures, it can read the sensor's output on the moment temperature, then writing this offset output value on a build-in EEPROM component. And after that when you flying helicopter, it will calculate the rightly output value for correct your rudder's motion in the more stable conditions. So you do these procedures only your flying environments have larger temperature changes.
Question 4 :
Where I should put the Gyro on the helicopter ?
Please see the figure on the instruction manual, there is show an axis of Gyro. This axis need to perpendicular with your helicopter's fuselage (i.e. this axis need to parallel with your helicopter's main rotate axis), and after installed please remember you still need to check the properly transmitter and Gyro's directions.
Question 5 :
Why every time I flying, the tail rudder will drifts to one of the directions ? How can I overcome this problem ?
You could overcome this problem by every time before you flying, switch the gyro to Head-Lock mode firstly, then adjust the rudder trim switch (or button) on your transmitter until rudder servo stop to drift. But remember every time you change the Gyro's gain value on transmitter you need to re-adjust once again.
Question 6 :
Do you have any brief instructions for setting the A500-G Gyro ?
Please refer to the attached " A500_G setting flow chart.pdf " file.