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  #1  
Old 04-12-2021, 07:39 PM
coopGT coopGT is offline
 
Join Date: Feb 2021
Location: Charleston, WV
Posts: 14
Default Skin buckled against 908-L bracket

After attaching the right skin (empennage) and riveting, I noticed the skin was against the 908-L bracket. It is buckled under pressure. Would the correct fix be taking a dremel or like grinder to trim the buckled part so it relieves the pressure? I want to avoid all possibilities of a fatigue crack later on. See attached pictures. Should I ask the mothership?

73 hours in a flawless build and I find this...
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  #2  
Old 04-13-2021, 03:36 PM
jdog0411 jdog0411 is offline
 
Join Date: Aug 2019
Location: Parker, Colorado
Posts: 43
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I'm not sure I know what I'm looking at. Is that a wood board it is bent up against?
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Parker, CO
RV-14A Under Construction
Empennage Kit arrived on 10/11/19.
Vertical Stabilizer DONE
Rudder DONE
Began Horizontal Stabilizer 01/28/20.
Horizontal Stabilizer DONE
Started Elevators on 02/24/20.
Elevators DONE
Tailcone DONE
Wing kit arrived on 7/30/20.
Began wing kit on 8/4/20.
Donated: 2021
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  #3  
Old 04-13-2021, 03:57 PM
agent4573 agent4573 is offline
 
Join Date: Aug 2019
Location: Mountain view
Posts: 317
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Can you take a picture a little further away? Having a hard time picturing exactly where this is in the structure. From what I can see, I would personally file the skin back so its not pressed against the reinforcement bar, but I also don't remember any of my skins having an intereference fit like that. It looks like you may have to take a few rivets out in order to gain access to the edge of the skin. What was your plan for getting a dremel or file in there?

Edit: Also, if I wanted to go look at the drawing for this part, could you confirm you're building an RV9 and the drawing number?
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Last edited by agent4573 : 04-13-2021 at 04:04 PM.
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  #4  
Old 04-13-2021, 03:59 PM
coopGT coopGT is offline
 
Join Date: Feb 2021
Location: Charleston, WV
Posts: 14
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It is a L bracket attached to the spar. I am attaching another picture.
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  #5  
Old 04-13-2021, 04:39 PM
Jslow2 Jslow2 is offline
 
Join Date: Dec 2020
Location: Cement City
Posts: 73
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To me it looks like your angle is off on the bracket, it looks good at the top but doesn't follow the angle of the skin. The dimensions on the plans are 1:1 scale, you should be able to set the bracket on the plans and make sure it is the correct angle
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  #6  
Old 04-13-2021, 04:41 PM
coopGT coopGT is offline
 
Join Date: Feb 2021
Location: Charleston, WV
Posts: 14
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Please see pictures posted of plans and farther away. The left L bracket has no interference and fit perfect but this one obviously not. It does not have a spar or anything behind it, was hoping to dremel it out slightly away from bracket to relieve pressure and no longer touch bracket.
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  #7  
Old 04-13-2021, 04:44 PM
Jslow2 Jslow2 is offline
 
Join Date: Dec 2020
Location: Cement City
Posts: 73
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I would modify the bracket, the skin is where it should be, the bracket seems to not be
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  #8  
Old 04-13-2021, 04:46 PM
coopGT coopGT is offline
 
Join Date: Feb 2021
Location: Charleston, WV
Posts: 14
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Question is, is it worth drilling out the 9 rivets or shaving the skin?
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  #9  
Old 04-13-2021, 04:55 PM
coopGT coopGT is offline
 
Join Date: Feb 2021
Location: Charleston, WV
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Quote:
Originally Posted by Jslow2 View Post
I would modify the bracket, the skin is where it should be, the bracket seems to not be
I can agree with this.
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  #10  
Old 04-13-2021, 06:16 PM
agent4573 agent4573 is offline
 
Join Date: Aug 2019
Location: Mountain view
Posts: 317
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Thanks for the extra pics, make it a lot more clear. I agree with the other people that the bracket looks slightly to large, not the skin. How you fix this issue has two possibilities
1. Make the bracket smaller
2. Make the skin smaller

Ideally you should shave the bracket down a hair and not the skin, but honestly, i think whichever is physically easier would be fine. That section of the tail will be covered by the empannage fairing when fully assembled, so a slight blend out of the skin won't affect the visual look of the final product at all. Either way, I think you have to remove one or both of the parts in order to properly clearance them. You may be able to use a cut-off wheel on a dremel to make a small gap in there and then clean it up with a small file and sandpaper. I personally would take 4-5 of the closest skin rivets along the skin edge out and attempt to pull the skin up and away. You might be able to get away with just removing the closest 2. Don't remove any rivets that are in a closed out area that can't be squeezed/bucked. Only consider removing rivets along the open edge. Then you can file back the edge of the skin until it lays flat again and re-rivet. This allows the use of "oops rivets" if you mis-drill during disassembly. You're also right between the 2 rivets on the skin, so blending the skin has no effect on edge distance requirements or strength if the blend is kept to a minimum. If you drill the 9 rivets on the bracket, you're already at 1/8", so you'd have to go with big *** rivets if you misdrill those holes. I have a few 5/16 rivets in my plane from messing up 1/8 and they're ugly.
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Last edited by agent4573 : 04-13-2021 at 06:25 PM.
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