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Old Feb 26, 2012, 02:43 PM
Registered User
United States, GA, Roswell
Joined Mar 2007
1,237 Posts
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HK 450 tail servo - shudder / noise

Hey guys... It's been over 2 years since I built or flew one of these things, and I can't remember this bit... I have a HK 450 with an Align, DS 520 on the tail. When I plug the servo directly into the receiver, there is no chatter at all. It's quiet and finds center with no noise.

When I plug the servo into the gyro (HK 401b) and power on, the servo seems to be having difficulty finding center and it chatters incessantly. Is this normal, or could one of you fine gentlemen point me in a good direction?? (I know, I know... the futaba 401 is better...)

Also, there is no slop in the tail and the linkage slides smoothly when not connected to the servo. I've tried different gain settings in my tx and that does not remove the chatter... although cranking up the gain seemed to make it worse.

Also I'm using the Turnigy 9x with the ER9x firmware.
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Last edited by hurleybt; Feb 26, 2012 at 02:48 PM.
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Old Mar 14, 2012, 12:29 PM
Registered User
中国, 云南省, 昆明
Joined Jan 2012
25 Posts
Is it happening on flight? If yes, the gyro may need vibration reduction or the gyro is broken...
If this happens on the ground, maybe the gyro is set in narrow-band mode makes servo rotating~
Have you heard about Tarot GY550 & GY650? Both are good, in surprising price.
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