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dvanlanen
Joined: 25 Jul 2006
Posts: 122
Location: Madison, WI
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 Posted: Thu Nov 06, 2008 7:28 pm Post subject: Edge Distance At Ends Of Rib Flanges |
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I don’t want to ask ZAC too many questions, so I’ll try the list on this question. I am laying out the rivet lines for my 601XL ailerons. The rivet line through the top skin into the front skin flange and top rib flanges is positioned at 10mm from the front of the skin (midway on the 20mm front flange). According to my measurements, these rivets will not meet the minimum edge distance requirements from the front of the rib flanges, because the way the ribs are manufactured, there is about a 4mm to 5mm gap between the front rib flange and the start of the top flange. So with the thickness of the front skin figured in, my edge distance from the front edge of the rib flanges will only be about 4mm. I can’t come up with a way to meet the minimum – all I could do is add another rivet, but the plans just show a normal pitch 40 on the remaining rivets. Does anyone know if this is an issue, or is it acceptable for this particular edge distance not to meet the minimum? I know when I built my stabilizer, there was a specific note that said I did not need to worry about this end-of-rib-flange edge distance, but I don’t want to assume that it applies in all cases. Any help would be appreciated.
Thanks,
Dave Van Lanen
601XL – tail done, working on wings [quote][b]
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dvanlanen
Joined: 25 Jul 2006
Posts: 122
Location: Madison, WI
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| Posted: Thu Nov 06, 2008 7:29 pm Post subject: Edge Distance At Ends Of Rib Flanges |
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I don’t want to ask ZAC too many questions, so I’ll try the list on this question. I am laying out the rivet lines for my 601XL ailerons. The rivet line through the top skin into the front skin flange and top rib flanges is positioned at 10mm from the front of the skin (midway on the 20mm front flange). According to my measurements, these rivets will not meet the minimum edge distance requirements from the front of the rib flanges, because the way the ribs are manufactured, there is about a 4mm to 5mm gap between the front rib flange and the start of the top flange. So with the thickness of the front skin figured in, my edge distance from the front edge of the rib flanges will only be about 4mm. I can’t come up with a way to meet the minimum – all I could do is add another rivet, but the plans just show a normal pitch 40 on the remaining rivets. Does anyone know if this is an issue, or is it acceptable for this particular edge distance not to meet the minimum? I know when I built my stabilizer, there was a specific note that said I did not need to worry about this end-of-rib-flange edge distance, but I don’t want to assume that it applies in all cases. Any help would be appreciated.
Thanks,
Dave Van Lanen
601XL – tail done, working on wings [quote][b]
| | - The Matronics Zenith-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Zenith-List |
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MHerder
Joined: 11 Feb 2008
Posts: 143
Location: Fort Worth TX
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| Posted: Fri Nov 07, 2008 6:23 am Post subject: Re: Edge Distance At Ends Of Rib Flanges |
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If it bugs you, you can assume the rivet does not exist (install it anyway), and place another (min distance 3d but not > than1/2 the pitch). This is called out in the construction standards.
I ran into a few of these situations and my personal handling of matters of these is.... Add another rivet if only for your own piece of mind. Heintz says.... When it comes to areas in question default too less pitch, larger rivets, thicker sheet etc.... In my humble opinion it is OK to be conservative.
| | - The Matronics Zenith-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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Zodiac 601 HD
Jabiru 3300
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