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IIRC Neil,
Each time the core thickness between the layers of composite doubles, the strength cubes. Just for an example, if the 10mm layup could handle 10 pounds of stress, then a 20mm thick layup should be able to handle a 1000 pounds(10 to the 3rd power) of stress. These are just made up numbers. No idea what these thicknesses can really handle. I do have a two foot long, twelve inch wide, 3/4" honeycomb core laminated with just glass that I can't even begin to bend by placing it over my knee.
JJ
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