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Old 09-23-2014, 02:32 PM   #21
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Looking at the curvature on the bottom picture; I'm guessing that that is the lower rear street side corner of the trailer and the rib's only go from above the bottom of that exterior panel to somewhere still below the top of the bottom of that exterior panel; if that makes sense(ie they're pretty short, probably just z shaped as well) those are normal, they can't run rib's all the way from the floor to the overhead so these help provide some basic rigidity to the exterior skin in that area.
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Old 09-23-2014, 03:06 PM   #22
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I've got some short ribs on my 67 Overlander. I don't know why it was built that way but I'm not going to spend time "fixing" it.
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Old 09-23-2014, 05:19 PM   #23
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I think when the inner skins are attached to the bows you end up with a pretty strong structure. I believe I have read where some rebuilders do extend the bows to the C channel making even a stronger structure.

Aerowood seems like an aircraft structure expert and is another source for information concerning the short bow lengths and their effect.

David
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Old 09-23-2014, 05:23 PM   #24
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Those "ribs" are correctly called "main bows".

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Old 09-23-2014, 08:21 PM   #25
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I can't imagine so many Airstreams would have them if they were a problem, since I've never seen this issue come up, I'm guessing it's not something to stress over. Since my husband is doing the work, I'll leave it up to him. Will keep you posted.
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Old 11-10-2014, 07:52 PM   #26
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I just opened up the front end of my 1957 22' Caravanner and have noticed that the ribs do not extend all the way to the bottom. It looks like it was made like that originally. I'm planning on extending them to the bottom C channel when I get to that point.
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Old 11-11-2014, 08:43 AM   #27
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I attached all of my ribs to the lower C channel, very little work involved.
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Old 09-09-2016, 01:58 PM   #28
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AW, where do you get the channel to construct the ribs. I have a '65 that I am redoing and am looking for quite a few feet of this material. I will use for the horizontal ribs where I will beef up where new shelving will be installed and use for wall studs for new walls.

I believe it is .032 channel and definitely measures 3/4"x11/2"x3/4". I do not have the tools to bend it and being I need so much, I have decided just to buy it if I can find it.
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