In this video, Randy Dobson explores the helicopter speed limit, dissymmetry of lift, and what causes retreating blade stalls.

Posted 7 years ago by Landan2010 in category: interesting   Comments (0)

It's an A. Watch to the end.

Posted 7 years ago by Bindra in category: magic   Comments (1)

Is there a difference?

Posted 7 years ago by boyt in category: interesting   Comments (0)

Posted 7 years ago by Ruckus42 in category: science   Comments (0)

Amazon Prime Air has begun private trials in England, and the first customer delivery by drone recently took place.

Posted 7 years ago by jess88 in category: technology   Comments (0)