Abstract

We measured the differential pressures of butterfly's wing surface at the time of take off. Simultaneously, we photographed high-speed videos from two directions. To measure the pressure, we attached a MEMS (Micro Electro Mechanical Systems) differential pressure sensor on the wing surface. We analyzed the data with the videos to calculate the lift coefficient during the flight of a butterfly. Then we revealed the number of lift coefficient during the insects' free flight. The results suggest that the number of lift coefficient was bigger at the take off compared to during a flight. Furthermore, we revealed that the number of lift coefficient agrees with conventional study that have conducted in the same Reynolds number.

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