محاضرة 2: الجزء 1 chopper : دورة طاقة الرياح
[youtube http://www.youtube.com/watch?v=YaT4WB7GubU]
[youtube http://www.youtube.com/watch?v=YaT4WB7GubU]
[youtube http://www.youtube.com/watch?v=YaT4WB7GubU]
[youtube http://www.youtube.com/watch?v=YaT4WB7GubU]