Fig. 2
From: Measurements of the hydrodynamic pressure on a surfboard fin during surfing
Waveform of the relative hydrostatic pressure measured by the four sensors in the left fin for the period shown in Fig. 1. The sensors are indicated by their location on the outside or inside surface of the fin in frontal or rear position according to Fig. 6. The time points when the surfer was either side of the channel are indicated by the gray bars with the pictures of the surfer on top. The traveling periods are named accordingly with left-1 to right-3.
