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Analogue experiments. Most artificial leaves consist of cantilevers hinged at their base (torsional stiffness k and length Le). (a) A drop of mass M1 is placed on the leaf, at a distance L1 from the tip. A drop of mass M0 and speed U0 impacts the leaf at a distance Δ from the drop M1. (b) After impact, the leaf motion is approximated by a solid body rotation (angle θ(t)). The velocity of the leaf tip is vL. Droplets of radius r are ejected at a velocity u. (Online version in colour.)
