Abstract
We have developed an insect-size flapping Micro Air Vehicle (MAV) with hovering ability, having a wing length of 5 cm and a total weight of 2.35 g. It can be remote controlled by infrared transmitter. Intersecting 4 wings, which consist of 2 pairs of wings, showing X-like front view, were driven by a pager motor of 4 mm in diameter. The static thrusts obtained by 4 wings was 30 % lager than the doubled value of those obtained by 2 wings for the same flapping frequencies. It can be considered to be due to the "clapping" effects of the butterfly. The electric energy to obtain the thrust of 2.35 g was 0.60 W, which is much lager than the theoretical value calculated by momentum jet theory.
