The angle and number of wind turbine blades. used for testing is a vertical Darrieus-H type with variations in the blades 2, 3, 4. Blades NACA 4415 specifications, speeds 4 m/s, 5 6 7 m/s s, 8 m/s. source using fan. Variations attack are 0o, 10o, 20o, 30o. blade made sea sengon wood. At position attack, 10o rotates faster due to influence lifting force 0o difficult rotate because straight direc...