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  #1  
Old 01-02-2015, 03:18 PM
Stan Bahrns Stan Bahrns is offline
 
Join Date: May 2005
Location: Effingham, IL
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Default Altitude Hold RV-12

I haven't read the book but am having an issue with the autopilot searching around for the altitude that I started off with. It gets worse with oscillation's
any advice besides reading the book?
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  #2  
Old 01-02-2015, 03:29 PM
BigJohn BigJohn is offline
 
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D180 or Skyview? Software version? More info needed. FWIW, in the D-180 implementation there are bunch of parameters that can be adjusted. All in "the book". Once you get all the the tweaks done I think you will be pleased with the stability.
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  #3  
Old 01-02-2015, 04:05 PM
Stan Bahrns Stan Bahrns is offline
 
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Default Altitude Hold

It's a Skyview. Thanks, I guess I better read the book
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  #4  
Old 01-02-2015, 04:47 PM
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Jesse Jesse is offline
 
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You can change the settings for the pitch servo in the settings. Maybe just play with them a little bit to get it where it feels good.
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  #5  
Old 01-02-2015, 04:58 PM
DHeal DHeal is offline
 
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Read the books! Dynon offers both general Skyview install/operations manuals and a separate autopilot set-up manual. Follow their AP tweaking procedures.
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  #6  
Old 01-03-2015, 11:36 AM
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Dgamble Dgamble is offline
 
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Quote:
Originally Posted by Stan Bahrns View Post
I haven't read the book but am having an issue with the autopilot searching around for the altitude that I started off with. It gets worse with oscillation's
any advice besides reading the book?
Mine hunted around quite a bit in altitude hold. Others have mentioned the availability of a tuning guide, but the quick fix for mine was to lower the 'gain' value in the autopilot settings.
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  #7  
Old 01-03-2015, 10:15 PM
RFSchaller RFSchaller is offline
 
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Dave,

My D180 pulses the stick at about 1 Hz. Not enough to porpoise but annoying. Did the gain reduction eliminate that on your AP?

Rich
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  #8  
Old 01-04-2015, 04:43 AM
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Dgamble Dgamble is offline
 
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Quote:
Originally Posted by RFSchaller View Post
Dave,

My D180 pulses the stick at about 1 Hz. Not enough to porpoise but annoying. Did the gain reduction eliminate that on your AP?

Rich
I don't think so. Seems like I've notices that there's always some kind of 'feel' in the stick when the AP is on and your description of it fits my memory of it. Almost a clicking kind of thing. I've can't say for sure if it's always there, but I do notice it from time to time.
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RV-6 N466PG Purchased already flying - SOLD!

The Book: The PapaGolf Chronicles

Built RV-12
http://www.schmetterlingaviation.com

The Book: Being written.

The above web blogs and any links provided thereto are not instructional or advisory in nature. They merely seek to share my experiences in building and flying Van's RV airplanes.
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  #9  
Old 01-04-2015, 09:02 AM
alexe alexe is offline
 
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Dave G, please check your PM's.
Alex
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  #10  
Old 01-05-2015, 03:19 PM
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MacPara MacPara is offline
 
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I had this oscillation issue too while others reported good performance. I tried tuning it a bit but didn't get it satisfactory. Eventually I looked at my values and compared them to the published default values (you find them in the tuning guide) and they were all ways off, even the ones I had never touched. I suspect that my unit was once installed in a different airplane and got refurbished and sent to me (hey, after my previous various experiences with Dynon this would not surprise me at all). I reset the settings to default values and have a much better performing system since. I still disable the autopilot when the air is rough but that might just be me preferring direct control under such conditions.
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