This video slowed down 50% shows how the transverse flow moves from the inside rail to the outside side as the rider  bottom turns, top turns and then does another bottom turn.

The obvious question after seeing the direction of the streamers in these photos is, what about the streamers that are still running nose to tail (axially)? We had the same question about how much lift was being generated by the transverse flow versus the axial flow. The Computational Fluid Dynamics (CFD) program has the ability to separately analyze the lift generated by the axial flow and the transverse flow. The results indicate that the majority of the lift is coming from the transverse flow, and a smaller part of the lift comes from the axial flow. Once you know that transverse flow is creating the majority of the lift, the objective then is to maximize the benefit of that flow.  The Camber Surfboards rail and bottom contour  reduces the velocity of the transverse flow and generates higher  pressure under the board. A flat bottom board, or even a board with a conventional shallow concave, allows increased flow to escape off the rails resulting in lower pressure under the board.  The goal is to increase the pressure on the bottom of the board to increase lift.  More lift allows the board to carry the weight of the rider with less drag.  Less drag lets you go faster…

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