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Lee Steensland
Joined: 10 Apr 2008
Posts: 18
Location: Spokane-ish- WA
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 Posted: Sat Jun 19, 2010 8:20 pm Post subject: more upgrade questions |
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Folks,
I feel like I'm a little thick sometimes. I have the center spar mostly assembled and I have both the front and back in position for drilling up through the top doubler (6-zu-2-1) However if I look closely through the holes I will just clip the old hole in 6w4-1.
I appear to be making an aluminum sandwich with the new top doubler 6-zu2-1 and the seat front angle 6-zu-2-2.
Should I just drill through the seat front angle, and into the top doubler, elongating the hole and not worry about it. I suppose that is why they went to pitch 20 on that row of rivets.
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Lee Steensland
Joined: 10 Apr 2008
Posts: 18
Location: Spokane-ish- WA
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| Posted: Mon Jun 21, 2010 9:01 am Post subject: Re: more upgrade questions |
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perhaps a little more data is in order:
I've attached a picture from from the latest set of upgrade drawings dated 25 Jan 2010. I've highlighted the rivets in question.
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carlossa52(at)gmail.com
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mhubel
Joined: 05 Sep 2009
Posts: 141
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| Posted: Mon Jun 21, 2010 10:17 am Post subject: more upgrade questions |
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Lee,
The drawing calls for rivets on a 20 mm pitch so some new holes need to be made anyway. I did all new holes with the old holes half way way between the new ones and offset enough so as to provide sufficient hole to hole spacing. If the old holes in yours are positioned such that there is no room to provide sufficient spacing, then ZAC will have to come up with something.
On 06/21/2010 1:34 PM, Carlos Sa wrote: [quote]I would suggest a call to ZAC is in order...
Carlos
On 21 June 2010 13:01, Lee Steensland <lee(at)steensland.net (lee(at)steensland.net)> wrote:
| Quote: | --> Zenith601-List message posted by: "Lee Steensland" <lee(at)steensland.net (lee(at)steensland.net)>
perhaps a little more data is in order:
I've attached a picture from from the latest set of upgrade drawings dated 25 Jan 2010. I've highlighted the rivets in question.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=301937#301937
Attachments:
http://forums.matronics.com//files/rivetsinquestion_246.jpg
href="http://www.matronics.com/Navigator?Zenith601-List">http://www.matronics.com/Navigator?Zenith601-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/contribution
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978-443-3955[b]
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Lee Steensland
Joined: 10 Apr 2008
Posts: 18
Location: Spokane-ish- WA
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| Posted: Mon Jun 21, 2010 2:01 pm Post subject: Re: more upgrade questions |
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From Caleb:
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Hi Lee,
A doubler, such as this, is the proper way to repair ovalled holes. That is one of the reasons for having the part installed at all. When you mess up a hole and its ovalled, you put a doubler over the hole and rivet it to the web as well as the flange. This will unload the ovalled hole and provide an alternate load path (the load now goes through the doubler) into the web. In this case the doubler is heavier than the flange material because we want to add strength beyond the normal spar. The ovalled holes are a consequence of spacing the front and rear halves further apart 1/8" but this has been accounted for in the development of the upgrade package. You don't need to worry about ovalling those holes, just so long as the holes in the doublers are all round.
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