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Home✈️Aircraft🚁HelicopterAlignT-REX 700N › Higher head speed causes up and down pitch jerking
06-05-2011 12:36 AM  8 years ago
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Jej34

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N.J

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Higher head speed causes up and down pitch jerking
Has anyone else had this happen. I am running a 700N with Microbeast. Out of the blue, the heli started this up and down pitching motion. Kinda feels like you are getting hit with interference. Again, it's not left cyclic or right cyclic or elevator axis either. It's as if you were purposely jamming the collective stick up and down. Once I pop out of stunt 1 and back to normal mode, problem is gone. I hear people out there saying the blades could be to loose ( HUH ?????)
Don't think so!
When this all happens, you don't notice any kind of vibration within the heli that may be messing with the receiver or Microbeast.
Wondering if there is a bearing ( one of the high speed one's) that is singing and causing rf at a certain rpm?

Any input will be appreciated.
I bought it as a kit, it ended up a kit!
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06-07-2011 07:20 PM  8 years ago
basmntdweller

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Indianapolis IN

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The obvious would be to check that the main shaft is still free of any vertical play.

Matt

Stupid people have no idea how stupid they are!!!
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06-08-2011 12:21 AM  8 years ago
AlignRC

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Taichung, Taiwan

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Pitch Issue
What servos are you using? When you say Higher head speed what numbers are you talking about? 2000? 2300? What is higher? Also have you set your Flybarless gyro up correctly. Make sure your using digital servos on most any Flybarless system.

Post some photos and what radio system your using. You could also remove your blades and tail blades and spool the rotor head a little to see if this problem is still present. Post some pictures I'm sure we will be better able to help.

Jeff Fassbinder
Align - Conquer Your heart
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06-08-2011 03:58 AM  8 years ago
Jej34

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N.J

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Problem found ! I pulled the head to check all the bearings, all was well. I decided to run up the engine, just spinning the clutch to try to duplicate the problem. Clear as day, when the R's incresed the left cyclic servo started twitching rapidly. I switched wires in the beastx and plugged a different servo into that port, problem was not there. I plugged the original servo in, problem came back. Wow, Jr 8717's with less then 50 flights, some 3d but not real hard, never been augered into the ground. Anybody know the procedure to send these back in, Horizon?

What is wierd is that although it was one servo and you would think it would of been a violent left or right cyclic twitch but I am guessing that the Beastx picked up on the cyclic change and compensated for it thus, cancelling out the left or right action and causing a up and down pop.
I've used nothing but Jr Servo's and this is the first problem i've ever encountered with them.

Thanks
I bought it as a kit, it ended up a kit!
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06-08-2011 02:17 PM  8 years ago
Thumpernator

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Senoia, Georgia, USA

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http://www.horizonhobby.com/Service/

Click on "Submit a Service Request."
Dave
I keep on thinking, but nothing's happening. Knuk, Knuk, Knuk
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06-08-2011 11:52 PM  8 years ago
AlignRC

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Taichung, Taiwan

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Pitch
Well I'm glad you found the faulty servo. Well at least you ruled out the variables and found the issue. Also by having the twitching you can also cause voltage spikes causing even more problems than you may think.

But I'm glad that you found it, so send it in to the manufacture and get flying.

Regards,
Jeff Fassbinder
Align - Conquer Your heart
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