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Asymmetrical elevator trim - why?

 
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Lenny Iszak



Joined: 23 Mar 2008
Posts: 270

PostPosted: Mon Jun 02, 2008 5:37 am    Post subject: Asymmetrical elevator trim - why? Reply with quote

I was just hooking up my trim hardware and I'm puzzled why the asymmetrical setup?
I had found a discussion about this in the archives (twisted tail discussion and all), but I would still like to find out how this asymmetrical setup works, and why they designed it that way?

Could anyone provide us with an explanation?

Regards,
Lenny
#40803


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bcondrey



Joined: 03 Apr 2006
Posts: 580

PostPosted: Mon Jun 02, 2008 5:58 am    Post subject: Asymmetrical elevator trim - why? Reply with quote

Lenny,

Original design had one of the trim tabs hooked in to the flap system to
compensate for the nose down tendency as flaps are applied (noticeable
with full flaps). Very early they (Van's) decided that it wasn't a big
deal and just used both flaps for the regular trim system. The plane
didn't really need any more nose down trim but really needed some help
with nose up trim with forward CG during landings.

Looks pretty strange but works fine.

Bob
N442PM flying

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