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  #1  
Old 04-29-2019, 03:42 PM
galt1074 galt1074 is offline
 
Join Date: Aug 2018
Location: Lakenheath, UK
Posts: 49
Default F779 and tailwheel spring

I'm having some fit issues in the tail and I know some other folks have had some similar issues.
The problem I'm having is with the spring itself. The weld at the front doesn't appear to be at the correct angle. When I try to install the aft-most bulkhead (F712 I think) it obviously requires the tails spring to be half-way in the mouse hole for the bulkhead to be installed. When the tail spring is in this position, there's a gap (probably 3/16" at least) at the top of the forward flange of the tail spring where it attaches to F711.
Anyone seen this and do I just add some shims?
I'm also having a heck of a time getting all the holes to line up but I think I just need to remove more material and make the hole bigger for the spring to pass through.

https://photos.google.com/share/AF1Q...VkeWdJMWdiamd3


https://photos.google.com/share/AF1Q...VkeWdJMWdiamd3
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  #2  
Old 04-29-2019, 04:27 PM
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Wunderon Wunderon is offline
 
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Location: Seattle (Edmonds) and Iowa
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Default

on my 8 I did shim that location approx .032” or so.

These shims were called out in my instructions.
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  #3  
Old 04-30-2019, 02:27 PM
galt1074 galt1074 is offline
 
Join Date: Aug 2018
Location: Lakenheath, UK
Posts: 49
Default big gap

Dave,

Thank you for your reply.
My concern is that my gap is 3/16" and growing as I remove material to get F712 to seat properly over the tail spring. If it were .032" that would be easily acceptable but this seems ridiculous. Either I'm doing something wrong or this part is bad.

Anyone?
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  #4  
Old 05-02-2019, 03:11 PM
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SeanB SeanB is offline
 
Join Date: Dec 2006
Location: Colorado Springs
Posts: 614
Default

Greg,

Did you measure the location for the front bolt holes on the bulkhead? I don't see any marks. I'm wondering if the steel part may just need pushed down some more, making it less of an angle. But, this is where you will also need to be careful with edge distance on all parts for the bolt holes.
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  #5  
Old 05-02-2019, 04:07 PM
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nzrv8 nzrv8 is offline
 
Join Date: Jun 2009
Location: Australia and NZ
Posts: 213
Default

On my -8, Vans recommended using shims or a spacer to fill the gap using the tail spring flange as a pattern. My gap was quite big from memory, maybe 1/8 or so. I?ll see if I can dig up a photo.
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  #6  
Old 05-02-2019, 04:54 PM
Maxrate Maxrate is offline
 
Join Date: Dec 2008
Location: League city, TX
Posts: 612
Default

Greg, welcome to the club. Most including myself had to shim due to the angles being slightly off. Mike Bullock has a great section in his builders log and here is a link to where I had to wrestle with the aft tail spring bulkhead. Good luck. You?ll eventually get it.

http://www.mykitlog.com/users/displa...=250369&row=28

http://rvplane.com/?categoryid=4&dayid=372
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  #7  
Old 05-03-2019, 07:05 AM
AndyWW AndyWW is offline
 
Join Date: Jan 2015
Location: Englefield Green UK
Posts: 75
Default

I had problems in this area and ended up having the WD-409 cut and re-welded. One of the faces was not parallel to the other one and my inspector wasn't comfortable with shims of different thicknesses that could have introduced point loads. After the repair everything was nice and parallel and I just used one 0.032" shim at the forward end of the weldment.
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  #8  
Old 05-04-2019, 03:24 AM
galt1074 galt1074 is offline
 
Join Date: Aug 2018
Location: Lakenheath, UK
Posts: 49
Default Maybe bad part

Andy,

If the angles are supposed to be parallel then I'm quite certain I have a bad part. I'll call Van's and talk it over.
Thank you everyone for the replies. I skipped the wings so I don't know about them but the beginning of the fuselage with the way some parts don't fit and how vague the instructions can be has been pretty aggravating. I'm sure I'll figure it out and it will be fun again.
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RV-7: Empannage complet, working on aft fuselage
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  #9  
Old 05-04-2019, 11:34 AM
galt1074 galt1074 is offline
 
Join Date: Aug 2018
Location: Lakenheath, UK
Posts: 49
Default "fixed" it

So there's nothing wrong with the part, there's nothing wrong with the skins, and there's nothing wrong with the way I was preparing everything except for missing some clecos.
I went ahead and put together the whole aft-fuselage and discovered my main issue was the angle of the F711/712 bulkheads because I hadn't cleco'd the top holes in the F779 skin where it joins with the top of the curve at the bottom of the bulkheads. This meant my bulkheads weren't at the proper angle and my tail spring was at the proper angle but everything looked off by a lot.
Now I have what appears to be all the standard problems with that part of the fuselage, which makes me feel better.
Thank you so much for all the replies.
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