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  #1  
Old 10-06-2021, 09:10 AM
amekler amekler is offline
 
Join Date: Aug 2009
Location: Gilford,NH
Posts: 136
Default setting up trim for takeoff 1st attempt issue

I'm not sure my trim is correctly set up. I followed the procedure in the setup for full up full down and takeoff
it said calibration accepted but I see no markings on the trim indicator.
I'm also confused when you engage nose up which way should the tab move?
any help pictures appreciated.
Thanks,
Alan
N603NH RV-12 almost done
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  #2  
Old 10-06-2021, 09:24 AM
swjohnsey swjohnsey is offline
 
Join Date: Nov 2018
Location: Kingsville, TX
Posts: 389
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Nose up the trim tab should move down.
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  #3  
Old 10-06-2021, 09:42 AM
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Mel Mel is offline
 
Join Date: Mar 2005
Location: Dallas area
Posts: 11,223
Default

Believe it or not, about 1/2 of all airplanes I inspect have the pitch trim set up backwards.

Easy way to remember is that the tab "flies" the elevator/stabilator, not the airplane. If the tab is down, it forces the elevator/stabilator up. And vice/versa.
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  #4  
Old 10-06-2021, 09:46 AM
amekler amekler is offline
 
Join Date: Aug 2009
Location: Gilford,NH
Posts: 136
Default

thanks
I think mine is wired backwards hence no trim indication
will check
Alan
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  #5  
Old 10-06-2021, 10:07 AM
CD. CD. is offline
 
Join Date: Mar 2021
Location: Alabama
Posts: 17
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Mine was wired backwards when I became the owner... the plane had been that way for 11 years. I couldn't stand it... swapped the wires at the servo and life is much better now.
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  #6  
Old 10-06-2021, 10:51 AM
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wcalvert wcalvert is offline
 
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Location: Anacortes Wa
Posts: 337
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Flown with the trim reversed for 11 YEARS?!! Wow
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  #7  
Old 10-06-2021, 11:17 AM
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rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,662
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Quote:
Originally Posted by Mel View Post

Easy way to remember is that the tab "flies" the elevator/stabilator, not the airplane. If the tab is down, it forces the elevator/stabilator up. And vice/versa.
Or in another way to look at it... the tab (regardless of whether it is on a traditional elevator or a stabilator) should always move in the opposite direction of the trimming function.

Trim switch activated for nose up - the tab should move down (and visa versa)
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  #8  
Old 10-06-2021, 11:23 AM
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rvbuilder2002 rvbuilder2002 is offline
 
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Location: Hubbard Oregon
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Quote:
Originally Posted by wcalvert View Post
Flown with the trim reversed for 11 YEARS?!! Wow
Not necessarily unusual depending on the configuration of the pitch trim switch.

In instances where the switch is panel mounted, it could be either way depending on a persons preference / logical reasoning....
Should you push the top of the switch for nose down trim (I.E., rolling the switch fwd. akin to turning a trim wheel fwd., or push the bottom of the switch for going lower?
Just another of the never ending debates

If the switch is on the stick, there should be no debate.
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  #9  
Old 10-06-2021, 11:40 AM
Pilot8 Pilot8 is offline
 
Join Date: Sep 2018
Location: California
Posts: 107
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Two white wires that run the length of the airplane, which are also polarized; what can go wrong?
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  #10  
Old 10-06-2021, 02:03 PM
gasman gasman is offline
 
Join Date: Mar 2007
Location: Sonoma County
Posts: 4,136
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Van's manual trim...... turn it one way, if the plane doesn't do what you want, turn it the other way.......
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