i know its a dumb question to ask but oh well…what does a concave do to a board. how does it effect riding, turning…thanks for the info in advance. Josh
Josh - take an old tip from Tom Morey. Try dangling a plain old ordinary spoon by the handle between your fingers so it can swing back and forth. Now turn on a water faucet full blast and let the outside (convex) of the spoon touch the water coming out of the faucet - it sucks into the water. Now turn the spoon around and let the inside (concave) of the spoon touch the water - it pushes away even if you apply pressure. That is the easiest way to demonstrate the hydrodynamics of concave and convex surfaces that I know of. Where, how big, how deep, etc. you shape them on a surfboard is where the fun begins.
Excellent explanation from John… Just to add: Concave = Lift. The Basics: Non-concave noses push through and over water. Concave noses use water pressure to create a cushion of lift to support your weight. Generally speaking, if you’re going the right speed, you can often get longer noserides with a concave nose. Like John said, placement and dimensions add tons of variables. Now, if you put a concave somewhere else on the board besides under the nose, it adds lift in that area… And “lift” often equates to “thrust” when a concave is placed near fins. But there are tons of theories out there that are way over my head. These are just my experiences. Hope they help…deeb…