Hiroto Tanaka

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We developed a very small and light butterfly-type ornithopter (BTO) to investigate butterfly flight. Its weight is 0.4 g, wing span is 140 mm and flapping frequency is 10 Hz. It flies forward passively. The flights were recorded with a highspeed video camera and the longitudinal motion of the BTO was analyzed. When the center of gravity was appropriate,(More)
The effect of wing flexibility in hoverflies was investigated using an at-scale mechanical model. Unlike dynamically-scaled models, an at-scale model can include all phenomena related to motion and deformation of the wing during flapping. For this purpose, an at-scale polymer wing mimicking a hoverfly was fabricated using a custom micromolding process. The(More)
Three types of artificial butterfly wings were fabricated for investigating the morphological function of actual butterfly wings. They consist of a thin polymer membrane and micromolded polyurethane veins. The planar shape and venation of one type were the same as those of a swallowtail butterfly, and those of the other two were different. The effect of the(More)
Unlike other flying insects, the wing motion of swallowtail butterflies is basically limited to flapping because their fore wings partly overlap their hind wings, structurally restricting the feathering needed for active control of aerodynamic force. Hence, it can be hypothesized that the flight of swallowtail butterflies is realized with simple flapping,(More)
This paper describes the fabrication of an artificial insect wing with a rich set of topological features by micromolding a thermosetting resin. An example 12 mm long hoverfly-like wing is fabricated with 50–125 μm vein heights and 100 μm corrugation heights. The solid veins and membrane were simultaneously formed and integrated by a single molding process.(More)
Insect- and bird-size drones-micro air vehicles (MAV) that can perform autonomous flight in natural and man-made environments are now an active and well-integrated research area. MAVs normally operate at a low speed in a Reynolds number regime of 10(4)-10(5) or lower, in which most flying animals of insects, birds and bats fly, and encounter unconventional(More)
Hummingbirds are promising reference for small flying robots in terms of their excellent ability to hover. Wing kinematics and shape of a hovering hummingbird were measured with four high-speed video cameras. Four types of wing models consisting of carbon fiber rods and polymer membranes with the same planform as the hummingbird wing were fabricated.(More)