Jim,
I have that H80 1/8" sample siting in front of me just now. Double layers of 6 oz on each side.
3-5/5" x 8-1/4" size and I can hardly cause any deflections with my hands. It is much stiffer than my stripped deck and bulkhead panels, those are single layers of 4 oz with 5/32" thick strips before sanding.
I need to make more samples, then I need to ask my former employees to perform some instrumented load-deflection plots to get a firm value for the stiffness.
As it is, I have modeled representative sections in Inventor, and performed virtual stress analysis tests.
There was essentially no difference between cedar core laminates and foam core laminates of the same dimensions. BTW, the 3D modeling software is very accurate, errors (or deviations from real world tests) are generally attributable to the constraints assigned and simplifications assumed. With such simple models, these Inventor models are very close to real world values.
As for costs, the Divinycell I bought was $50 for a 4 ft x 8 ft sheet, or $1.56/sq ft.
Around me, cedar costs about $2.00/linear ft for 1 x 6, 2S.
If that cedar were cut into 5/32" strips with 1/16" blade waste, you could get 25 strips, each 3/4" wide.
If I did the math correctly, it ends up at $1.33/sq ft of cedar. Of course, with a wider blade and more waste, the costs only go up from there.
