[_yb2s]

Not really- even very thick carbon is quite flexible…. It works great for applications where you want that like bendy sailboat masts and front forks on bikes, but it should be cored or replaced with something else if you are looking for stiffness

[ndsipa_pomu]

That doesn't match with my experience. I've got a carbon fibre road bike and some parts of the frame are remarkably stiff whereas other areas such as the handlebars have noticeable flex.

It can be surprising to people just how tough/strong carbon fibre parts can be - here's Danny MacAskill's destructive testing of some CF wheels: https://www.youtube.com/watch?v=VfjjiHGuHoc