I built this Surf-style street carving set-up to test deck shapes (pictures below). The deck is made from 0.5" Baltic Birch core with 6-oz plain weave carbon cloth over 6-oz +/- 45 bi-axial fiberglass on the bottom, with printed cotton fabric on the top. Resin Research Kwik Kick epoxy was used for lamination and hotcoats. Tips are 0.25" aluminum plate bent to 35 degree angles.
This project was the first time I worked with carbon, bi-axial FG, cotton fabric, Baltic Birch and RR Kwik Kick epoxy. Thought this would be good practice.
I was hoping the carbon over bi-axial would make the deck plenty stiff. Sadly, too much flex – bummer. The deck was plenty stiff over bricks without tips. Because I wanted my stance width narrower, this moved the weight distribution more to the center, creating more deck flex. The added length from tips changed the flex.
I need to stiffen the deck. A wider stance will/did definitely reduce flex noticeably.
I figure I will add a layer of 6-oz S-Glass to the top of the deck first. I figure creating a composite bi-layer to minimize parallel surface movements relative to the core should help to stiffen it up some before trying a wider stance. This way I might not have to widen the stance too much.
Since the epoxy has already cured, I need to sand the hotcoat over the cotton print so I can laminate the S-glass on the top. What grit sandpaper should I use to make sure I get a good bond with the cured epoxy?
These are the type of rigs I ride now, built from custom assemblies of commercial parts: