Fig. 5: Ceiling perching experiments.
From: Energy efficient perching and takeoff of a miniature rotorcraft

a Sequential images of the robot perching and taking off from the dry acrylic. b The time course of the motor voltages and the power consumption of the robot. Blue dots correspond to the timing of the images in a. Gray shadings indicate different perching stages. c The photographs of the ceiling perching experiments with different surfaces and conditions.