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  #1  
Old 10-27-2017, 09:22 PM
Allan Stern Allan Stern is offline
 
Join Date: Jan 2006
Location: Cape Coral, Florida
Posts: 164
Default RV 12 Trim tab

I have the Dynon Skyview system and am setting up the trim tab scale. When setting the tab to take off is the tab level with the stabilator in forward/take off position? On the scale where is the take off position? The center or somewhere else? Where is the info in the plans?

Thanks
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  #2  
Old 10-27-2017, 10:16 PM
alexe alexe is offline
 
Join Date: May 2013
Location: Temecula, CA
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Hi Allan,
All the -12’s that I know of, including mine, wind up with the takeoff position mark on the indicator somewhere below the center. There are some good threads on this forum that will help you set things up properly. Try searching on “AST measurement” or similar.
Alex
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  #3  
Old 10-27-2017, 10:22 PM
John-G John-G is offline
 
Join Date: Jan 2012
Location: Northeast Ohio
Posts: 455
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Allan,

With the control stick in the full aft position, move the anti servo tab until it is approximately 1 7/8" higher than the stabilator .... measured from trailing edge to trailing edge. Then tell the SkyView this is the take off position. This should get you in the ballpark for a safe first flight.

This link is to a photo that was posted here by another poster.
https://2.bp.blogspot.com/-1FdMcom3U...ps7a46c741.jpg
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  #4  
Old 10-28-2017, 09:02 AM
Mich48041 Mich48041 is offline
 
Join Date: Apr 2008
Location: Riley TWP MI
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The trim takeoff position on the EFIS display is about 1/3 of full scale. It is better to error on the side of nose down trim. At least one RV-12 has crashed on first flight because of too much nose up trim. The plane jumped into the air, stalled, and hit the runway.
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  #5  
Old 10-28-2017, 10:17 AM
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DaleB DaleB is offline
 
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Location: Omaha, NE (KMLE)
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Quote:
Originally Posted by Mich48041 View Post
The trim takeoff position on the EFIS display is about 1/3 of full scale. It is better to error on the side of nose down trim. At least one RV-12 has crashed on first flight because of too much nose up trim. The plane jumped into the air, stalled, and hit the runway.
Wow.

I have inadvertently (checklists are a Good Thing) taken off with a good fist-full of UP trim still set from landing. It will get your attention, but is certainly nothing some forward pressure on the stick can't overcome.
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Last edited by DaleB : 10-30-2017 at 04:31 PM.
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  #6  
Old 10-28-2017, 10:39 AM
JBPILOT JBPILOT is offline
 
Join Date: Nov 2007
Location: Jesup, Iowa
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Default INTERESTING THOUGHTS - -

I actually like to take off with the takeoff trim set the same as landing. I just look to see the trim indicator is lined up and go. Yes, you need to trim down shortly after takeoff, but I guess you can get use to doing it either way huh ?
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Last edited by JBPILOT : 10-28-2017 at 10:40 AM. Reason: word change
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  #7  
Old 10-28-2017, 11:23 AM
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 6,972
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If the RV-12 PAP (production acceptance procedure) document is utilized for final inspection, on the very first page it says -

Use the corresponding “Read me” file and set up your EFIS per the manufacturer’s instructions: http://www.vansaircraft.com/public/downloads.htm
This explains the process of downloading Van’s Aircraft factory settings for the RV-12, including TRIM take off and AP servo configuration, etc.


If you use/load the appropriate downloads file it will automatically load the take-off position in the trim indicator. Then use the information in the downloads read-me file to confirm that all of the settings are correct (it includes photographs showing how to confirm proper travel using measurements, etc.
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  #8  
Old 10-30-2017, 04:17 PM
Allan Stern Allan Stern is offline
 
Join Date: Jan 2006
Location: Cape Coral, Florida
Posts: 164
Default Trim

Thanks for the info. It has helped.
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