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Old 05-04-2016, 08:17 AM   #15
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Again, this is another situation that any serious manufacturer of a structure like an AS would have an engineering model. That model would show the stress distribution from which questions like this could be answered. Short of that, we are guessing or looking at similar past examples or something else like blame the tires.
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Old 05-04-2016, 08:41 AM   #16
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As Andy literally "wrote the book" on Airstream damage and assessments, I think I'm gonna side with him on this discussion!
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Old 05-04-2016, 11:32 AM   #17
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Again, this is another situation that any serious manufacturer of a structure like an AS would have an engineering model. That model would show the stress distribution from which questions like this could be answered. Short of that, we are guessing or looking at similar past examples or something else like blame the tires.

There MIGHT have been an engineered model for the 70s trailers and maybe not.

Byum was not an engineer, however there might have been more engineering in the Beatrice era.

Even if there was significant engineering efforts in this era, I don't know of anything that says that the interior panels had to contribute more than five or ten percent to overall structure.


Superat stultitia.
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Old 05-05-2016, 12:42 AM   #18
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the reason the interior rivets pop out / shear from time to time is because they are under stress ! the stress is caused by the interior skin acquiring and supporting load!
that alone tells me that yes the interior skin helps support load . also 40 years of putting them back together has taught me a little.
as I said earlier I've seen the result of removal .
I don't think any engineer has looked at this construction since the big 1 and for the most part the construction hasn't changed . the exception to that are the ccd's without belly pans ( jc has a kit to reinforce the frames after they buckle )
take the skin out , do whatever you want it's your trailer ?
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Old 05-05-2016, 02:17 PM   #19
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Are the internal rivets softer now than used years ago?
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Old 05-05-2016, 04:15 PM   #20
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Are the internal rivets softer now than used years ago?
Softer ? No.

Color difference. Yes

Old color. Ivory

New color. White or silver

Andy
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Old 05-07-2016, 10:56 PM   #21
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Ok, thanks all for the information, very helpful. But I think we sidetracked a bit... I completely understand how and why the inner skin is used. My thought is that I can now use a better product to keep the hull intact longterm. By using the inner skin behind cabinets, some walls, lower edge of bed, read end top piece etc. Then the rest use t and g wood, long pieces, fastened at every rib. Then on every rib where there is t and g I will have a band of painted steel that will not rust every 1' or 6" even fastened with olypmic rivets, so now we have screws at each point and a barrel like structure with rivets also put through. I cannot fathom how the inner skin would be stronger than this. I will also we be using painted copper penny panel for the whole top run of the inner skin, much stronger and just sweet looking. I will be creating a solid air barrier on the outer skin interior with relfectix and aluminum foil tape, then using 2 inch roxul insulation on the hull, 6 inch roxul on the underbelly, no reflectix as it won't do much from underneath. I am looking to passively heat and cool this airstream. Will have a couple new fans, wood stove. When all windows closed there will be no air leaks. I build homes and have roofed for years and I know the folly of making walls improperly, there are many new houses people ignorantly buy and will be rot in 5 to 10 years. The screws in the wood and the extra rivets are way more solid than the inner skin was period. How can it provide more structural integrity than my idea is my question? Thanks all, love the feedback!
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