There are several possibilities:
(1) first check the gyro, tail server, tail rotor, etc. to see if bad, bad can be replaced.
(2) Check the gyroscope, transferred to the best location to see if there is no good tune will appear two cases, respectively mate with the small degree of Vice-degree swing around from side to side. Mate degrees swing: As the flu through the small, causing the rear swing around Suobu Zhu, must transfer large gyro sensitivity, transferred to the appropriate location. Associate degrees small swing: As the flu through the large, locked tight causing the tail to be a small gyro sensitivity adjustment.
(3) Check the rod end of the server if the server into a 90-degree vertical angle, perpendicular to the tail pipe. Note: The transmitter with the controls in the original location, the server must be connected into power after the 90-degree angle. Disconnect the motor safety line must first be tested.
(4) If you have Suobu Zhu tail, you can adjust the end of the third step with the server, you can loosen the two screws on the server end server location back and forth, as the main rotor and tail rotor speed is directly proportional Therefore, special attention is required in adjusting the tail rotor angle of attack, while the tail with the tail rotor drive servo control system is to control the tail rotor push-pull angle, by adjusting the tail pipe on the end of the server location, you can adjust the tail rotor angle. And the tail rotor angle of attack angle of the main rotor position than the best combination in the tail gear box outside the left of the horizontal axis of the 1 / 3, so the tail end of the server with the gear box to the left of the horizontal axis outside combination of 1 / 3 to adjustment is the standard state.

    Helicopter flight to be checked if the belt slack, slack will be fixed if the tail pipe rack out of the four screw worked loose, pull back slightly to the tail pipe, tighten the belt tension after the four screws (not too loose belt, too slippery with pine bark, nor too tight, too tight to wear the belt).
    Belt tightness test method: pressing the skin with your fingers can be slightly flexible, the pressure belt is not too much effort.

    Connect the power body was found in the gyro light flashes, there are two possibilities:
    First, move the transmitter bar, the helicopter was no response from the server, this is a signal problem, you must check whether the transmitter and receiver on the loose crystal, can be re-installed.
    Second, the mobile transmitter rod, the end server does not move, the other can operate, there are three reasons for this are: a, the end of the server is broken; b, broken gyroscope; c, a bad electronic governor the. (End server and the gyro in normal circumstances, moving the throttle lever, the motor was no response, the electronic governor is broken)

   Adjust the pitch into a straight line and curve pitch pitch travel itinerary adjustments. Switch pitch only be adjusted within a small range, and if adjustments need to be adjusted for a wide range of helicopters to be adjusted steering rod pitch.
   (1) The pitch line travel: the upper left corner is a straight line transmitter pitch travel, mainly the use of 3D flight, such as the lift is not enough, you can directly adjust the pitch. Pitch is too large to transfer a small stroke, pitch travel is too small to turn up.
   (2) curves of pitch travel: the upper right corner is the curve of the transmitter pitch travel is a normal flight use, the main force is raised, it should be noted that in the case to add a little throttle with machine adjustments, pitch travel is too large to transfer small, the pitch is too small to transfer large stroke. Usually not encountered in the lift can not fly helicopters, this is the pitch problem. Because a direct impact on the main rotor pitch angle of attack, especially in 3D flight can be easily demonstrated. Normal flight angle of attack will be bigger bigger lift helicopter, the speed will be faster. Note that if too large angle of attack will cause no efforts to master the motor produced a large load, the opposite is too small does not work, the helicopter will not lift.
   3D helicopter flying stunts, because inverted flight when the angle is the angle with the opposite, so the angle of attack is too large inverted over the lift generated when the main rotor is not up but down. Adjust the pitch to be transferred to the positive and negative lift should be noted that equal the best. In the special flight, is flying can be adjusted by the larger angle of attack (pitch curve adjustment stroke), inverted angle of attack can also be transferred to larger (adjusted linear pitch travel) is, for doing the action will play a more good results.