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White and Nerdy
Join Date: Jun 2004
Location: South of Charlotte N.C.
Posts: 14,923
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The #1 reason is strength and weight. Try picking up a 1/2"-2" cross section 30" long aluminum bar some time. Then weld an I beam out of three pieces of the same material, and try again.(If you stack those 3 on top, it will still bend like crazy)
The shorter span that comes with two wings, combined with supports making a multi-unit structure connecting the two wins, allowed for light weight, and stiff structure. Almost half the length, and connecting supports.
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Shadilay.
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