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thesumak(at)aol.com
Guest

Posted: Sat Mar 15, 2008 8:48 pm Post subject: Sign-on for structural analysis

I’m building from a regular kit, but I also just finished my first wing (with wing locker) and though I’m just a grunt, I saw nothing that would give me pause.   I do however take very seriously the designers warning about airframe stress associated with abrupt or accidental elevator movement but I have faith that Zenith will take a closer look at that.  I have no interest in helping to fund an independent analysis.

 

  

 

  Bill

 

     

    Do not archive

     

     

   

 

   

 

 --

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rsteele(at)rjsit.com
Guest

Posted: Sun Mar 16, 2008 6:47 am Post subject: Sign-on for structural analysis

I'm out.



I'm wondering just what is the expected result of this analysis.   

There are two possibilities, the design is found to be sound, in  

which case money has been spent to feel good.  Or the design is found  

to be deficient.  In this case you can't expect he consultant to  

redesign the wing, which would be a whole other level of effort and a  

lot more money, not to mention liability issues for the engineer.



Regarding the static testing:   The purpose of a test is to gather  

information.  That can best be done in a very controlled environment  

and static testing is the most controlled you can get.  All sorts of  

structures are tested this way from bridge models to sky scrappers.   

It's not perfect, but most things in life aren't.  Perhaps more  

information could have been gained thought testing to destruction,  

but it's not really necessary in this case sense he design loads were  

met.



I'm with Larry on this, work with ZAC.  Build a wing and do the  

destructive test yourself in whatever failure mode you are concerned  

about.



do no archive.	



Ron

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jmaynard

Joined: 27 Feb 2008
Posts: 394
Location: Fairmont, MN (FRM)

Posted: Sun Mar 16, 2008 7:01 am Post subject: Sign-on for structural analysis

On Sun, Mar 16, 2008 at 10:44:47AM -0400, Ronald Steele wrote:

 	  Quote: 	
		   I'm wondering just what is the expected result of this analysis.   

 There are two possibilities, the design is found to be sound, in  

 which case money has been spent to feel good.  Or the design is found  

 to be deficient.  In this case you can't expect he consultant to  

 redesign the wing, which would be a whole other level of effort and a  

 lot more money, not to mention liability issues for the engineer.


	


Knowing there's a problem - or not, as is entirely possible - is half the

battle. If nothing else, if there is a problem, then we can, hopefully, get

Zenith/Zenair to fix it.



 	  Quote: 	
		   Regarding the static testing:   The purpose of a test is to gather  

 information.  That can best be done in a very controlled environment  

 and static testing is the most controlled you can get.  All sorts of  

 structures are tested this way from bridge models to sky scrappers.   


	


If it's a problem that only appears under certain conditions you can't

achieve in static testing, though, you'll never find it.



Aircraft have more ways to go wrong than bridges or skyscrapers, too.



I'm not saying that there is a problem. I just want to know for sure.

-- 

Jay Maynard, K5ZC                   http://www.conmicro.com

http://jmaynard.livejournal.com      http://www.tronguy.net

Fairmont, MN (FRM)                        (Yes, that's me!)

AMD Zodiac CH601XLi N55ZC (getting ready to order)

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_________________
Jay Maynard, K5ZC
AMD Zodiac XLi N55ZC

ashontz

Joined: 27 Dec 2006
Posts: 723

Posted: Sun Mar 16, 2008 8:52 am Post subject: Re: Sign-on for structural analysis

This is my real interest in this. I can accept the inherent dangers in flying, but no chance in taking any more risks than is necessary. If you can double check this on the ground, why not. Be like assuming you have enough fuel on board or the oil level is topped off. That's just stuff you check. If you experienced an odd engine vibration on your last, you probably wouldn't just forget about it and go ut flying the next day. You also check this out if it seems something is amiss. Nothing chicken-hearted here at all.



do not archive



 	  jmaynard wrote: 	
		  If it's a problem that only appears under certain conditions you can't

achieve in static testing, though, you'll never find it.



Aircraft have more ways to go wrong than bridges or skyscrapers, too.



I'm not saying that there is a problem. I just want to know for sure.

-- 

Jay Maynard, K5ZC                   http://www.conmicro.com

http://jmaynard.livejournal.com      http://www.tronguy.net

Fairmont, MN (FRM)                        (Yes, that's me!)

AMD Zodiac CH601XLi N55ZC (getting ready to order)

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stshuck2(at)yahoo.com
Guest

Posted: Sun Mar 16, 2008 9:45 am Post subject: Sign-on for structural analysis

Well said the both of you,,,, I'M STILL IN as well..



ashontz <ashontz(at)nbme.org> wrote:  [quote]--> Zenith-List message posted by: "ashontz" 



This is my real interest in this. I can accept the inherent dangers in flying, but no chance in taking any more risks than is necessary. If you can double check this on the ground, why not. Be like assuming you have enough fuel on board or the oil level is topped off. That's just stuff you check. If you experienced an odd engine vibration on your last, you probably wouldn't just forget about it and go ut flying the next day. You also check this out if it seems something is amiss. Nothing chicken-hearted here at all.



do not archive

jmaynard wrote:

[quote] If it's a problem that only appears under certain conditions you can't

 achieve in static     [quote][b]

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