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Old 10-21-2020, 08:21 PM
bsbarnes10 bsbarnes10 is offline
Join Date: Sep 2019
Location: Texas
Posts: 39
Default Problem with J-stiffener fit on bottom skin

I've seen a couple threads on this issue but none had any closure so I'm hoping someone with experience (or maybe from from Van's) can chime in...

My problem is that J stiffener F-1283B doesn't sit flush against the bottom right skin F-01282-R-1 when installed per the plans page 10iS/U-06

I checked the corresponding part on the left skin (F-1283A & F-01282-L-1) and it fits right up against the skin as I'd expect.

I checked the radius of the two J stiffeners F-1283A & B and they look to be identical

Next I checked the radius on the skins (as measured by the distance from the holes on the web to the vertical portion of the flange) and the radius on the two skins is definitely different

Here is the offending right skin F-01282-R-1

And the correct (I assume?) left skin F-01282-L-1

Another thread on this topic suggested the stiffener on the right skin should go on the OUTside of the skin and I agree the radius fits better but then the holes don't line up and the plans clearly show in figure 2 that the J-stiffener F-1283B goes inside the skin F-01282-R-1 for riveting.

Does anyone have any suggestions or experience here?

Also, on a related issue F-1284-R & -L seem to be mislabeled in figure 4 on page 10iS/U-03? The L / R designation shown on that page does not match the L/R orientation shown on page 10iS/U-06.

Any help or guidance would be greatly appreciated!


Last edited by bsbarnes10 : 10-21-2020 at 08:23 PM.
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Old 10-22-2020, 10:11 AM
WJaviation WJaviation is offline
Join Date: Jul 2020
Location: Pensacola
Posts: 15

Im seeing the EXACT same issue on my build. Even down to the same measurements. Id love to get an answer on how to proceed.
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Old 10-22-2020, 01:01 PM
bsbarnes10 bsbarnes10 is offline
Join Date: Sep 2019
Location: Texas
Posts: 39
Default Heard from Vanís

I just got a response from Vanís on this (thanks Sterling). They indicated it isnít a problem and suggested I fabricate a spacer, match drill, and install two rivets. They also confirmed that F-1284L/R are mislabeled.

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Old 10-22-2020, 02:27 PM
WJaviation WJaviation is offline
Join Date: Jul 2020
Location: Pensacola
Posts: 15

Interesting, I'm curious to see how yours turns out with the spacer.
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Old 10-22-2020, 08:48 PM
RFSchaller RFSchaller is offline
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 3,127

My build was finished in 2012. I donít recall having any issue. Is this something new?
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Old 10-23-2020, 01:34 PM
brucehatch brucehatch is offline
Join Date: Jan 2019
Location: American Fork, Utah 84003
Posts: 23
Default Tail cone J-Stiffiner gaps

I'm at this point in my build now. I have gaps between both the bottom left and right skin J features and F-1283 A & B J-Stiffeners. A .016" thick shim spacer will fill the gap on the left side and a .025" thick shim spacer will do the job on the right side. I can make both from practice stock sent with the empennage kit. Insertion of the shims will ensure accurate longitudinal hole alignment between the full length of the J-Stiffeners and the bottom skins.
My hat is off to bsbarnes10 for his clear explanation of the problem and the photos. This saved me from wasting time trying to sort it out on my own.
Overall, I have been continually amazed at the accuracy of the kit's part geometry and hole locations. This is a pretty minor hick-up. Love building this thing.
-12iS S/N 121208
Empennage Kit 98% complete
N45LH reserved
EAA Chapter 753, Provo, Ut.
Dues paid thru 2021
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Old 11-02-2020, 06:52 PM
bsbarnes10 bsbarnes10 is offline
Join Date: Sep 2019
Location: Texas
Posts: 39

I'm glad this post was helpful and agree, so far everything else has matched up just about perfectly. I had a bit larger gap on one skin (about 0.039") while the other fit perfectly, or at least close enough I was comfortable snugging it up with the rivets. I ended up making the the shim from some of the 0.040" 2024 AlClad from the trim bundle.

Here is the gap:

The spacer:

And the spacer installed:

When I added up the thicknesses it looked like an AN470AD4-4.5 was a hair short and an AD470AD4-5 was a bit too long so erred on the long side.

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Old 12-04-2020, 11:35 AM
jcl777 jcl777 is offline
Join Date: May 2016
Location: Kingwood, TX
Posts: 42

Many thanks for this info. We have this issue on a high school build.
John Leon
Kingwood, TX
RV-12iS, N221TF, #121130
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