Stabilator control horns too large

[olegusan]

Hi all,

I come across a weird thing.
I've put together the spar box assembly and tried on the control horns. (Page 09-03). They turned out to be about 1.5mm larger than the spar box. (see the attached pics). There must be some spacer or a doubler between the horns and the spar, but there is nothing in the plans.







What did I do wrong? How do I fix it?

Thank you

[jlfernan]

Common problem Vans says you can shim it.

https://www.dropbox.com/s/jznc71hzxi...00010.jpg?dl=0

[rgmwa]

I had to use shims too.

[pierre smith]

Very timely advice since I'm at that point.

Thanks,

[magiccarpet]

I fabricated 4 shim plates, of which I used only two in the end.

Originally Posted by olegusan

They turned out to be about 1.5mm larger than the spar box.

I didn't know that you measure in "mm" in Australia too.
Now I got used to fractions of inches as well.

[waterboy2110]

Shimmed mine also. Called Vans since at that time I was all worried about the ELSA stuff. Didn't seem to bother them and they said it was common.

There are a couple places that shims make sense. Consider them when it comes up. Once such place is the tail cones bulkheads. If you pull the skin into the bulkheads they will oil can around that area. Other RV'r (not the 12's) do this often. Don't over build it though, it's a solid design.

[magiccarpet]

Originally Posted by waterboy2110

There are a couple places that shims make sense.

Another example is the nose rib of the flaperons.

[Mike S]

Oleg-----welcome to VAF

[Dave12]

Originally Posted by pierre smith

Very timely advice since I'm at that point.

Thanks,

Pierre, are you building a 12?

[Cyclone]

Moving into the tail cone. My control horns fit perfect. Must be some variability in the horn fabrication.