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Plywood choice for ribbon subroadbed
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[quote user="fulton"] <p>What thickness of plywood is best for ribbon subroadbed? I'm building a 10'x10' HO scale layout with lots of mountains and 2-4 percent grades (and tight curves--minimum radius 20"). From what I've seen searching the archives, 3/4" plywood may not bend enough to get a good transition into and out of the grades, especially with sharp curves--but then others say that 1/2" plywood (when cut to 2.5-3" wide) may sag. What do you suggest?</p><p>[/quote]</p><p>I used 3/4" plywood (cabinet grade) for my layout. The transitions worked fine - they are gradual, as needed. I did not have any side to side elevation problems. All of my curves are either 20"r or 18"r (most). The picture shows 100' of mountain track work at an average 2% grade (24" climb in three loops).</p><p>[IMG]http://i111.photobucket.com/albums/n123/Alan_B/090406-021_r.jpg[/IMG]</p><p> </p>
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