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-   -   setting up trim for takeoff 1st attempt issue (https://vansairforce.net/community/showthread.php?t=199861)

amekler 10-06-2021 09:10 AM

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

swjohnsey 10-06-2021 09:24 AM

Nose up the trim tab should move down.

Mel 10-06-2021 09:42 AM

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.

amekler 10-06-2021 09:46 AM

thanks
I think mine is wired backwards hence no trim indication
will check
Alan

CD. 10-06-2021 10:07 AM

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. :)

wcalvert 10-06-2021 10:51 AM

Flown with the trim reversed for 11 YEARS?!! Wow

rvbuilder2002 10-06-2021 11:17 AM

Quote:

Originally Posted by Mel (Post 1560166)

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)

rvbuilder2002 10-06-2021 11:23 AM

Quote:

Originally Posted by wcalvert (Post 1560197)
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 :rolleyes:

If the switch is on the stick, there should be no debate.

Pilot8 10-06-2021 11:40 AM

Two white wires that run the length of the airplane, which are also polarized; what can go wrong? :)

gasman 10-06-2021 02:03 PM

Van's manual trim...... turn it one way, if the plane doesn't do what you want, turn it the other way.......:D


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