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Rear Spar attachment

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Tim Juhl

Joined: 21 Mar 2006
Posts: 488
Location: "Thumb" of Michigan

Posted: Sun Sep 14, 2008 4:50 pm Post subject: Rear Spar attachment

I get the impression that the rear spar attachment bracket on the 650 is made out of thicker material.  Can anyone confirm that? If it has been beefed up is the new one adaptable to the XL?  I'm at the point where I'll be installing mine soon.



Tim

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_________________
______________
CFII
Champ L16A flying
Zodiac XL - Jabiru 3300A
Almost done! It'll fly in spring!

craig(at)craigandjean.com
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Posted: Sun Sep 14, 2008 5:10 pm Post subject: Rear Spar attachment

Roger was asked about that at OSH. It is thicker but only because it is

narrower on the 650 as compared to the 601XL.



-- Craig



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jaybannist(at)cs.com
Guest

Posted: Sun Sep 14, 2008 5:10 pm Post subject: Rear Spar attachment

Tim,



I'm quite sure you know this, but the rear spar attach plate is .063".  

  It bolts to the rear wing spar which is .025" with a .063" doubler. It 

is riveted to the rear frame channel that is .032". What would be 

gained with a thicker attach plate?



Respectfully, "because the 650 has one" is not a very good answer 



Jay in Dallas

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Tim Juhl

Joined: 21 Mar 2006
Posts: 488
Location: "Thumb" of Michigan

Posted: Sun Sep 14, 2008 5:55 pm Post subject: Re: Rear Spar attachment

Jay,

If it was confirmed that the bracket had been beefed up then my next question would have been to ask what had been done to the attaching structure.  



I'm not trying to add to the hysteria about the wing safety, but I have always considered the rear attachment to be a potential weak point.  Since I will be working on that section soon I thought it would be good to investigate whether or not major changes had been made in that area that were adaptable to my XL.



I've been away from building since early June so I am not as up to date on current events as I would like to be.  Since I plan to get back to building soon I'm just trying to get up to speed.



Tim

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_________________
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Thruster87

Joined: 16 Apr 2008
Posts: 193
Location: Australia

Posted: Sun Sep 14, 2008 10:31 pm Post subject: Re: Rear Spar attachment

A reason for beefing up the rear spar plate to say 0.090" would be if you intend to take the wing off/on  on a regular bases.This would minimize elongation/wear on the attach holes. Cheers T87

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jaybannist(at)cs.com
Guest

Posted: Mon Sep 15, 2008 5:27 am Post subject: Rear Spar attachment

Tim,



Again, I meant no disrespect.



At the time I was working on it, I wondered: Since there are actually 

two doublers (an angle and a plate) on the rear wing spar, why were 

there not doublers on the channel in the fuselage ? It seems to me that 

reinforcing that channel would be necessary to get any benefit from 

thickening the connector. Beyond that, the wing rear spar is stabilized 

in buckling by being riveted to the wing skins.  The fuselage channel 

only has the bottom flange stabilized by riveting to the fuselage floor 

and the .025" upright channels.



The point is that this is a very complex connection; and one that 

shouldn't be messed with, without a LOT of engineering analysis.  I am 

assuming that the change in the angle of incidence of the 650 wing was 

the reason for the change to the connector plate; therefore, it really 

doesn't apply to the XL.



Jay in Dallas

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A.F.RUPP(at)att.net
Guest

Posted: Mon Sep 15, 2008 6:25 am Post subject: Rear Spar attachment

Tim,

According to ZAC in the Summary of Changes in the Builders Update section of the Zenith website the forward and rear uprights geometry was changed to accomodate the angle of incidence change and thus the attach plate was changed. As Jay pointed out there were a series of changes in that area to accomodate the canopy and wing incidence changes. The drawings for the canopy latches are available as is a list of the changes from the 601XL to 650 on Zeniths Builders Update website.

Al

601 XL



-------------- Original message from jaybannist(at)cs.com: -------------- 

[quote] 

 Tim ......

 The point is that this is a very complex connection; and one that 

 shouldn't be messed with, without a LOT of engineering analysis. I am 

 assuming that the change in the angle of incidence of the 650 wing was 

 the reason for the change to the connector plate; therefore, it really 

 doesn't apply to the XL. 

 

 Jay in Dallas 

 

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PatrickW

Joined: 27 Oct 2006
Posts: 380
Location: Fort Worth, Texas

Posted: Mon Sep 15, 2008 12:55 pm Post subject: Re: Rear Spar attachment

 	  Tim Juhl wrote: 	
		  I get the impression that the rear spar attachment bracket on the 650 is made out of thicker material.  Can anyone confirm that? 	


Here's a picture, with a ruler held up against it.



- Pat

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RearPlate.jpg

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ggower_99(at)yahoo.com
Guest

Posted: Mon Sep 15, 2008 9:09 pm Post subject: Rear Spar attachment

Thats about    0.1377949"      

 Do not archive.

 



--- On Mon, 9/15/08, PatrickW <pwhoyt(at)yahoo.com> wrote:



  	  Quote: 	
		  From: PatrickW <pwhoyt(at)yahoo.com>

Subject: Re: Rear Spar attachment

To: zenith601-list(at)matronics.com

Date: Monday, September 15, 2008, 4:55 PM



 	  Quote: 	
		  --> Zenith601-List message posted by: "PatrickW"

<pwhoyt(at)yahoo.com>

Tim Juhl wrote:

 	  Quote: 	
		   I get the impression that the rear spar attachment bracket on the 650 is

made out of thicker material.  Can anyone confirm that?
	




Here's a picture, with a ruler held up against it.



- Pat



--------

Patrick

601XL/Corvair

N63PZ (reserved)





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