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  #1  
Old 06-03-2017, 12:03 AM
KALEWIS's Avatar
KALEWIS KALEWIS is offline
 
Join Date: Nov 2009
Location: Jackson, OH
Posts: 461
Default AP Pitch Settings

Ok, to start off, the AP is great but .. I have went thru the inflight procedures and I'm still having an issue with the capturing of altitude. The AP will blow thru the selected altitude by maybe 60 feet and then keep "oscillating" +- 40-60 feet on either side of the selected ALT. sometimes VSI up and down by up to 400fpm. Smooth air is better but not perfect. I have tried different values in the pitch settings including the VANS RV-12 presets. No play or slack in the control system. Looking for some input for data points on what pitch values seem to work best.
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  #2  
Old 06-03-2017, 10:07 AM
DHeal DHeal is offline
 
Join Date: Sep 2006
Location: Windsor, California
Posts: 610
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Kyle -- My RV-12's SV altitude hold function seems to work fine using Van's pre-sets. Might you have an issue (partial blockage, loose connection, etc?) with your static system? -- David
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David Heal - Windsor, CA (near Santa Rosa)
EAA #23982 - EAA Technical Counselor and Flight Advisor; CFI - A&I
RV-12 E-LSA #120496 (SV w/ AP and ADS-B) - N124DH flying since March 2014 - 540+ hours (as of Sept 2017)!
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  #3  
Old 06-03-2017, 10:40 AM
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
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Quote:
Originally Posted by DHeal View Post
Kyle -- My RV-12's SV altitude hold function seems to work fine using Van's pre-sets. Might you have an issue (partial blockage, loose connection, etc?) with your static system? -- David
In addition, excess friction in the pitch axis can cause issues.
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  #4  
Old 06-03-2017, 11:04 AM
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KALEWIS KALEWIS is offline
 
Join Date: Nov 2009
Location: Jackson, OH
Posts: 461
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Just had the VFR / static check last week and no leaks. Scott, the controls are smooth Thru all ranges of travel, what is a good way to determine excess friction.
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Airspeed, Altitude, or Brains...you need at least two

RV-12 #328
At 260 Hrs on the Hobbs

http://unicom12.blogspot.com/
Click on above for build site
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  #5  
Old 06-03-2017, 06:59 PM
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KALEWIS KALEWIS is offline
 
Join Date: Nov 2009
Location: Jackson, OH
Posts: 461
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Today I reloaded skyview 15.1 with the vans presets and flew in relatively calm air. The AP captured alt well and held it within 20'. Much better than before.
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Airspeed, Altitude, or Brains...you need at least two

RV-12 #328
At 260 Hrs on the Hobbs

http://unicom12.blogspot.com/
Click on above for build site
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