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  #11  
Old 09-03-2018, 07:44 AM
cajunwings cajunwings is offline
 
Join Date: Jun 2007
Location: new iberia la
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Default Flap damage

I would certainly start by removing some rivets to see if it will smooth out. Get a opinion from a sheetmetal guy. Building another is always a option.


Don Broussard
RV9 Rebuild in Progress
57 Pacer
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  #12  
Old 09-03-2018, 08:01 AM
edbooth edbooth is offline
 
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Location: Trenton, SC
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You have to take whatever course of action that will make you happy. This is probably a 70-80 thousand + airplane that your probably going to sell one day not a beater car to pound dents out of. You could have just about had a new flap built in the time used on these posts. The next owner will thank you....
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  #13  
Old 09-03-2018, 12:39 PM
David Paule David Paule is offline
 
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Location: Boulder, CO
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One option is to replace the skins and trailing edge, keeping the spar assembly.

Dave
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  #14  
Old 09-03-2018, 11:00 PM
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DrillBit DrillBit is offline
 
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Quote:
Originally Posted by David Paule View Post
One option is to replace the skins and trailing edge, keeping the spar assembly.

Dave
Already did that for the right aileron, which—ahem—didn’t escape the ravages of the rogue tool chest either.

I appreciate the conservative advice—rebuild from all new parts, or just the top and bottom aft skins and wedge, since no other parts were damaged. Sound advice it is, leaving no doubt as to airworthiness.

And I also appreciate the adventurous calls to see what happens with an attempt at straightening. If I got a cosmetic QB second right flap to replace the original, I’d have a stormy day project to work on instead of flying.

But folks, the point of the OP was whether a repair that discarded all crumpled components, but retained as much of the original aluminum as possible was, well, possible? I’m really not excited about re-doing all 8+ feet of a -9 flap (and my building surface for the flaps was recycled long ago), which means I’m lazy and/or immoral for sure. But the engineering question posed was, could one make an acceptable repair from a << 8 ft length of AEX and a 1x4 ft sheet of .020 Alclad. Cheaper than two full skins and AEX, with overlength ship charges to boot.

Cost (along with Schedule and Performance) IS the engineering triangle. I’m curious whether it could be done... but won’t ignore whether it should be, no question.
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Last edited by DrillBit : 09-03-2018 at 11:02 PM. Reason: Typos
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  #15  
Old 09-04-2018, 10:28 AM
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longranger longranger is online now
 
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Quote:
Originally Posted by DrillBit View Post
... Cost (along with Schedule and Performance) IS the engineering triangle. ...
The mantra when I worked for a NASA contractor: "Better, faster, cheaper. Pick two."
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  #16  
Old 09-04-2018, 12:36 PM
Volumex Volumex is online now
 
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Location: Sarnia, ON
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8" of new trailing edge and opps rivets where there are elongated holes will have that looking almost as good as new, and it would be structurally sound.

It's your knowledge that it is less than perfect will bug you until you fix it until it is completely good as new.
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  #17  
Old 09-04-2018, 12:38 PM
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Mel Mel is online now
 
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Quote:
Originally Posted by longranger View Post
The mantra when I worked for a NASA contractor: "Better, faster, cheaper. Pick two."
I'm not sure that "Better" and "Cheaper" will play well together. I think a more practical statement would be to "Pick One"!
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  #18  
Old 09-04-2018, 02:40 PM
David Paule David Paule is offline
 
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Two are the best you can hope for.

Sometimes we only get one.

And alas, some days, we don't get any.

Dave
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  #19  
Old 09-04-2018, 02:53 PM
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airguy airguy is offline
 
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Quote:
Originally Posted by Mel View Post
I'm not sure that "Better" and "Cheaper" will play well together. I think a more practical statement would be to "Pick One"!
Well seeing as how the gummint was involved, I would say that you certainly could achieve "better" and "cheaper" by removing them - and likely get it faster too.
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  #20  
Old 09-23-2018, 09:57 PM
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DrillBit DrillBit is offline
 
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Quote:
Originally Posted by longranger View Post
The mantra when I worked for a NASA contractor: "Better, faster, cheaper. Pick two."
My engineering baptism (having entered industry with an academic Pee Aitch Dee) was similar: "Fast, cheap, and good: pick two." The corollary is one is in fact constrained to optimize between the two chosen attributes. Arguably, as other posters have pointed out, the final choice is one out of three.
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N748PK, RV-9A
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