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  #1  
Old 06-04-2017, 09:57 PM
gen1313 gen1313 is offline
 
Join Date: Sep 2014
Location: Forbes, NSW, Australia
Posts: 28
Default Auto Pilot Issue

I've just clocked up 50 hours on my 14 and have recently noticed a small issue with the auto pilot (GMC-307 & GSA-28's).

On the last couple of cross country trips, I have noticed that the pitch servo is making constant small adjustments. This only amounts to 20 feet or so in altitude change but the conditions are perfect and lightly touching the stick I can feel constant small adjustments being made for pitch only. Because it's only a small issue I cant say exactly when it started but I can't imagine what I have changed that could be related. I recently updated the G3X software but I think the problem started before that.

Does anyone have any ideas?
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Graham Haley
RV-14 #140181
Flying 5th January 2017
50+hours now
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  #2  
Old 06-05-2017, 04:57 AM
MLock MLock is offline
 
Join Date: Jan 2005
Location: Waldorf, Md.
Posts: 268
Default

Graham,

While setting up the AP in N914VA, I experienced the same thing. You need to adjust the gain in the pitch servo. Our website has all the basic settings for an RV-14 G3X AP system as I determined during testing. They most probably will need to be tweaked for your airplane, but are a good start. In the meantime, set the gain in the pitch servo to:

Vertical Speed Gain 1.50
Vertical Accel Gain 1.50

That should help.

Good luck
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Mitchell Lock
President Van's Aircraft
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  #3  
Old 06-05-2017, 06:08 AM
MED MED is offline
 
Join Date: Jul 2015
Location: Aiken, SC
Posts: 124
Default

Mitch,
You updated your signature line, but didn't change your location. Are you staying on the East coast? Congratulations, by-the-way.
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  #4  
Old 06-05-2017, 03:43 PM
gen1313 gen1313 is offline
 
Join Date: Sep 2014
Location: Forbes, NSW, Australia
Posts: 28
Default

Quote:
Originally Posted by MLock View Post
Graham,

While setting up the AP in N914VA, I experienced the same thing. You need to adjust the gain in the pitch servo. Our website has all the basic settings for an RV-14 G3X AP system as I determined during testing. They most probably will need to be tweaked for your airplane, but are a good start. In the meantime, set the gain in the pitch servo to:

Vertical Speed Gain 1.50
Vertical Accel Gain 1.50

That should help.

Good luck

Thanks Mitch,
I'll check it out but I'm fairly confidant that I used Vans suggested settings. The puzzling thing is that it all seemed good and now it has changed.
At least you've given me somewhere to look.
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Graham Haley
RV-14 #140181
Flying 5th January 2017
50+hours now
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  #5  
Old 06-06-2017, 03:43 AM
MLock MLock is offline
 
Join Date: Jan 2005
Location: Waldorf, Md.
Posts: 268
Default

Thanks Mark. Didn't dig that deep into the change on VAF. Not staying on the east coast. The move comes in a month.
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Mitchell Lock
President Van's Aircraft
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