Fig. 6From: Wave-slope soaring of the brown pelicanTop Panel: Coordinate system for the inertial trajectories of a pelican wave-slope soaring on a solitary wave. Middle Panel: Ground velocity vs. air velocity for wave-slope soaring and respective relations to phase velocity (c) and wave-induced wind (uwi). Bottom Panel: Coordinate system for (xb,zb) in terms of η(x) and bird’s flight heightBack to article page