Thursday, January 21, 2010
Tuesday, January 19, 2010
I built my rails, and cut my rocker into the bottom of the rails. Now it was beginning to take the fluid shape of a surfboard.
Rocker - the curve of the board from front to back - is an important aspect of surfboard design. It will affect paddling, wave-catching ability, turning, and negotiating steep drops.
Everything is a compromise - there is no one "best" rocker profile, you just have to find what works best for your board, your waves, and yourself.
Sunday, January 17, 2010
Compound curves are often cut on a bandsaw, when building furniture with curved legs, for example. If you know how its done, you understand the principle behind "bahrman rails". click here for a glimpse of what I'm referring to. Except I use a circular saw, jigsaw, and japanese pull-saw, not a bandsaw.
I started with my plan shape (template), and my lengthwise rocker profile (stringer shape). I decided my ribs would be 5" o.c. - closer than most other boards I'd seen, but stronger too.
Once I had my template, I cut 1.5" wide rail pieces from a redwood 2x6, and layered them vertically so that I could cut a rail with rocker from them. The key is using the rocker profile, with ribs marked every 5", and using those marks to correlate with the same rib layout on the rails.