Well I did this for personal use, to add to my "material library" I haven't tested them in a lab or something like that so I don't have numbers about their stiffness and strenght.What I can say is that the PVC foam cored sample is quit strong in ratio to his weight.
A second remarkable thing was the carbonfiber sandwich with fiberglass. I've did Carbon-glas-Carbon-glas-Carbon resulting in a very stiff, but heavier part.
samples with the carbon only start to get stiff after 5+ layers. When there are less layers its quit easy to bend.
I'll try to upload a new video talking about the weight and more details on the samples in the near future
