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  #1  
Old 06-23-2018, 10:25 PM
DaveO DaveO is offline
 
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Location: Greenfield, IN
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Default Oil Canning

I have oil canning between the first and the second of the right side of the tail cone.
I thought about purchasing some stiffness and installing them in the middle of the part that oil cans.
When i push in from the outside I can see a indentation of the skin. I think if the support that portion of the stop I can stop the event.

What do many of you think, or is there a more practical way of dealing with this issue.

Thanks in advance for your help
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  #2  
Old 06-23-2018, 10:41 PM
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bkervaski bkervaski is offline
 
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It's common, I've seen it in more than a few RV's. Mine has some, not very noticeable but definitely there. The J-Stiffener is what caused mine, not perfectly straight, there is a slight twist in it.
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  #3  
Old 06-24-2018, 07:54 AM
Reflex Reflex is offline
 
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Dave,

Not sure exactly where you mean, but I'm thinking you're describing the area between the most forward bulkhead and the second bulkhead. If so, I have the same issue. Although shown on the left in the picture below, mine too is on the right side.

I discovered mine while the cone was still upside down on the sawhorses and before I riveted. After taking the entire assembly apart four times and putting it back together in a different order (top to bottom, bottom to top, front to back and back to front). I decided that there was nothing I could do about it. I hoped that it would go away after riveting, but it didn't.

As described by Bill, the oil canning is very slight. I decided to live with it and add some sort of stiffener later if it really botheres me. Would take almost nothing to make it go away.

Picture below shows the location.

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Last edited by Reflex : 06-24-2018 at 09:02 AM.
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  #4  
Old 06-24-2018, 03:37 PM
Aluminum Aluminum is offline
 
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Location: San Jose, CA
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Default

Quote:
Originally Posted by Davoakes@att.net View Post
I have oil canning between the first and the second of the right side of the tail cone.
Me too, but on the left side. Keep us posted on the results if you do decide to add extra stiffeners. A piece of butyl or foam acoustic damping material might be enough to prevent canning in practice. Then again, this is not the easiest place to reach once it's all buttoned up.
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  #5  
Old 06-24-2018, 04:02 PM
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bkervaski bkervaski is offline
 
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Yep, same location @Reflex posted on mine.
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  #6  
Old 06-24-2018, 04:26 PM
DaveO DaveO is offline
 
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Yes, You hit the spot," Reflex" and also in behind the next bulkhead back. Both are not real bad, I think that I will live with it. Though, as I look down across the outside of the metal I can see a small what appears a dent. I do not like that.

I followed the instructions in the order of riveting, but it still happened.

In reality, unless one is looking for that effect, I do not think it would be a issue.
Thanks for all your input to the situation, my post left words out as I did not read it before I posted.

If I change mind and try to fix the situation I will repost.
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  #7  
Old 06-24-2018, 10:52 PM
KeithB KeithB is offline
 
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You won’t get a much clearer example than this.

This was taken during Phase I fly off. I had similar examples on the other side - definitely exacerbated by pressures during flight.

To fix it, I cut segments of J-stiffener and mounted them between the bulkheads, parallel to the horizontal stiffeners, held to the skin with pro seal - six pieces in all.
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  #8  
Old 06-25-2018, 06:37 AM
Reflex Reflex is offline
 
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Keith...simply put....WOW!

Quote:
You won’t get a much clearer example than this.

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  #9  
Old 06-25-2018, 06:43 AM
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Mel Mel is offline
 
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Quote:
Originally Posted by KeithB View Post
To fix it, I cut segments of J-stiffener and mounted them between the bulkheads, parallel to the horizontal stiffeners, held to the skin with pro seal - six pieces in all.
Any time you add a stiffener between bulkheads, be sure to secure that stiffener to the bulkheads at each end. Otherwise a crack will develop over time at the end of the stiffener.
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  #10  
Old 06-25-2018, 08:24 AM
JDA_BTR JDA_BTR is offline
 
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Might be fun to come up with a paint scheme that makes the flaw a feature.
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