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Old 09-07-2014, 08:55 PM   #1
dereckbc
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Default Visionaire Elevator Oscillation

Have a Visionaire for about 6 months now and today the elevator started oscillating at about 60 to 70% throttle setting. Never had an issue before today and no changes have been made.

Any ideas?
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Old 09-07-2014, 09:43 PM   #2
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Totally speculating here, but given the circumstances you describe, perhaps some slop has developed in the elevator system, or even the gears in the elevator servo are wearing, so when the AS3X system commands a correction, there is enough slop that it doesn't get the desired response and commands more and more until the plane over-responds, then cycles back the other way, and so on.
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Old 09-07-2014, 10:29 PM   #3
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Had to replace elevator servo. no slop in it now.
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Old 09-08-2014, 01:03 AM   #4
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Maybe a hole wearing at the control horn? Hinges? Don't know, just throwing out ideas. The gyros not being mechanical means they probably didn't wear out!
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Old 09-08-2014, 04:40 AM   #5
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I use the Hobbyking stabilized receivers, if I have the gain turned up too much, I will get an oscillation.

Backing the gain off solves the problem for me.

That might be the reason you had to replace the servo, constant slight corrections would be very hard on the servo gears. I set my gain to correct in a gental manner.

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Old 09-08-2014, 01:15 PM   #6
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Sounds like too much gyro gain to me.
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Old 09-08-2014, 05:27 PM   #7
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Yes, but I'm pretty sure in the Visionaire, there are no gain adjustments possible. Some AS3X planes, most notably E-Flite's Carbon-z Yak 54, get this issue at high speeds out of the box. Derekbc's problem just started for some reason.
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Old 09-08-2014, 06:52 PM   #8
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Well according to the AR635 manual (the Rx that's fitted to the VisionAire) the gain values are fully adjustable individually on each channel :http://www.horizonhobby.com/pdf/SPMAR635-Manual_EN.pdf (page 12)

It's possible that there has been a slight increase in control surface slop, or slackening off of the hinges, or wear on the linkages, or a new faster servo, increased surface throw etc etc... Any of these small changes might easily have pushed the gyro response just slight over the edge, if the gains were close to the limit to start with it only takes a very subtle change to do it.

Its an easy thing to adjust so if it were mine I'd try it. The symptoms certainly sound 100% like they are due to too much gain.
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Old 09-10-2014, 02:02 AM   #9
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Originally Posted by Wildflyer View Post
That might be the reason you had to replace the servo, constant slight corrections would be very hard on the servo gears. I set my gain to correct in a gental manner.
You might be right. When I got the plane is just my 3rd plane and I have only been flying for about a year. When I first flew it was high and great big lazy race-track circles 1/2-mile in diameter around air field so the plane was not close enough to observe. Now very close to ground, slow, fast, sort of 3-D from rank beginner so now I can see it closeup and personal.

Anyway I will have to experiment with gain on elevator channel. What gripes me is it is suppose to be "FACTORY TUNED". Although I must say HH replaced the servo for free and not many questions.
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Old 09-10-2014, 02:11 AM   #10
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Originally Posted by JetPlaneFlyer View Post
It's possible that there has been a slight increase in control surface slop, or slackening off of the hinges, or wear on the linkages, or a new faster servo, increased surface throw etc etc...
Plane had about 15 flights on it when elevator servo stripped. HH replaced it with original servo and it now has about another 15 to 20 flights on it. Everything appears tight. Before I use to fly the plane at a distance from me so I might not have noticed the oscillation from a distance which might of failed the first one.

Anyway off to read and pray.
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