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Rear Spar attachment

 
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Tim Juhl



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

PostPosted: Sun Sep 14, 2008 4:50 pm    Post subject: Rear Spar attachment Reply with quote

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

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
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PostPosted: Sun Sep 14, 2008 5:10 pm    Post subject: Rear Spar attachment Reply with quote

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 Wink

Jay in Dallas
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Tim Juhl



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

PostPosted: Sun Sep 14, 2008 5:55 pm    Post subject: Re: Rear Spar attachment Reply with quote

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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Thruster87



Joined: 16 Apr 2008
Posts: 193
Location: Australia

PostPosted: Sun Sep 14, 2008 10:31 pm    Post subject: Re: Rear Spar attachment Reply with quote

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
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PostPosted: Mon Sep 15, 2008 5:27 am    Post subject: Rear Spar attachment Reply with quote

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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PostPosted: Mon Sep 15, 2008 6:25 am    Post subject: Rear Spar attachment Reply with quote

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

PostPosted: Mon Sep 15, 2008 12:55 pm    Post subject: Re: Rear Spar attachment Reply with quote

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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PostPosted: Mon Sep 15, 2008 9:09 pm    Post subject: Rear Spar attachment Reply with quote

Thats about 0.1377949" Smile
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)


Read this topic online here:

http://forums.matronics.com/viewtopic.php?p 4451#204451


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