A butterfly wind turbine (BWT) is a kind of vertical axis wind turbine (VAWT) with closed-loop blades. These blades form a double-blade structure. which is expected to improve self-starting properties and reduce energy costs because of their simple construction. Two models of micro BWTs (diameter: 0. https://www.jmannino.com/special-deal-A-Magazine-Curated-By-Sacai-quick-pick/