Brain2HD Tail Probl...
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Brain2HD Tail Problem

Active Member Customer
Joined: 7 months ago
Posts: 9
Topic starter  



I took my gasser today for the first run in test, and I noticed that the tail servo is jittering when the engine is idling, then when I increase rpm and do a hover the jittering

Log Parameters

decreases but the tail will still twitch from time to time.


I attached my setup as well as my logs, kindly check and help me pinpoint the problem.

Member Admin
Joined: 3 years ago
Posts: 672

Hi Ahmad,
The flight log eleven file you attached does not match the screenshot of the parameter configuration you sent. It is also very long (6061 seconds = 101 minutes) and contains "dirty" data. If you have not done so after the last firmware update as suggested by the message that appeared after the firmware update, we suggest that you clean the logs memory by reformatting it using the "Erase Log mem." button.

There is one oddity in the configuration:
On page 1 of the Wizard you selected KST BL825 as tail servo, which is a servo with 1520us center pulse. However, in panel 7 you have selected the 760us center pulse icon as tail servo. If the servo shown in panel 1 is correct, it means that your tail servo is only working for half of its travel as explained in capital letters in the instructions on the side of panel 7.
In this case we suggest you to open the "Servo chart tail" and select with two clicks the servo row KST BL825. This will automatically set the correct parameters for your KST tail servo. Then you will have to go to panel nine and reset the correct travel and endpoint limits.


By jittering do you mean fast or slow oscillations? Or are they sudden jerks?

If you have selected the wrong type of servo, it could be that on one hand the tail servo frequently stops working because it goes "out of sync" (receives pulses with 760us pulse durations that are not managed for the 1520us servo type).

Is the tail drive belt driven or shaft driven? If it is belt driven, there could be electrostatic discharges that cause this phenomenon. To eliminate them, simply connect the metal parts of the tail rotor mechanics to the chassis.

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