Schedule 4 Like 0 4:51 PM - 5:04 PM [C4-08] Field experiments of 7m Butterfly Wind Turbine with over-speed control using movable arms ○Yutaka Hara1, Hiroyuki Higami2, Hiromitsu Ishikawa2, Takeshi Ono2, Hiromitsu Koike2, Shigenori Saito3, Satoshi Takahashi3, Manabu Ookubo3 (1. 鳥取大学, 2. 日軽金アクト(株), 3. 日本軽金属(株))