Dissymmetry of Lift in Helicopters

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=Cv74zHSLQ7A

Welcome to Helicopter Lessons in 10 Minutes or Less! • Check out my ebook covering this and more! Get your copy on iBooks: http://itunes.apple.com/us/book/id144... • or on Kobo for Android, Windows and Desktop users: https://www.kobo.com/us/en/ebook/heli... • Want to buy me a beer or coffee as a thanks? https://www.paypal.com/cgi-bin/webscr... • This is the first video in a series I'll be continuously working to develop. My goal is to take topics associated with flying helicopters , one by one, and teach them in a format that's easy to grasp. That said, I want to make videos that are clear enough to explain a subject, but also brief enough to not get too bogged down in all the little details. • The subject in this video is dissymmetry of lift. As defined in the FAA's Rotorcraft Handbook, dissymmetry of lift is, When the helicopter moves through the air, the relative airflow through the main rotor disc is different on the advancing side than on the retreating side. The relative wind encountered by the advancing blade is increased by the forward speed of the helicopter, while the relative wind speed acting on the retreating blade is reduced by the helicopter’s forward airspeed. Therefore, as a result of the relative wind speed, the advancing blade side of the rotor disc produces more lift than the retreating blade side. In the video I use a simple diagram with a blade tip speed of 300 knots and a forward airspeed of 100 knots to illustrate this principle. As the advancing blade moves forward in its plane of rotation, it's relative wind is 400 knots (300+100). The retreating blade is moving away from from the relative wind which results in a relative speed of 200 knots (300-100). This difference in speed results in a difference in lift. As the name implies, there is dis symmetry in the lift of the rotor system. This occurs in any direction of flight (foreword, sideward, and rearward) and can even occur in hover flight if sufficient wind creates an advancing and retreating blade. • I hope you enjoyed the video! Thanks for watching! • Check us out on Facebook for more Helicopter videos! / 10minlessons • If you're just getting started and want more information, pictures, and more explanations, I'd recommend reading the Rotorcraft Flying Handbook - http://amzn.to/2ifPlnZ • If you've already got a basic understanding, and want to further your professional helicopter education with advanced helicopter concepts, I'd recommend reading Cyclic and Collective, by Shawn Coyle - http://amzn.to/2ifQGLx

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