Last year I swiped an idea from Firewire surfboards and installed a springer into the neutral axis of the board. Well, what I thought was the neutral axis. In the last year there have been some changes and it seems the neutral axis on a surfboard has either changed, or been abandoned in favor of recessed on the deck side.
My build thread from last year is
here The changes in Firewire's tech is
here If you notice the propaganda from the Firewire site, they are describing layers, like the leaf spring of a car, which is the graphic also. Last year I just used a thick Balsa board, which was ok, but there really isn't much flex return as the minimal amount of flex we get with our boards didn't engage the balsa board. I needed to tighten up the response.
If you "glue" three things together, no matter what the material - say playing cards they become incredibly stiff resisting any forces that try and deflect it. Carbon has great flex return and retains that characteristic when included in an epoxy matrix.
So my springer for this build is 3 layers of 6 oz CF sandwiching 2 layers of 1/16" Balsa.
I'll be incorporating the sandwich springer into a composite sandwich board.
CF/Balsa/CF/Balsa/CF laminate stack:
Threaded Mode