This video was created in partnership with Bill Gates, inspired by his new book “How to Avoid a Climate Disaster.” Find out more here: https://gatesnot.es/3u7UUVU

This video is about how physics dictates the design of modern windmills - why they are so big, have so few blades, and have such skinny blades.

REFERENCES
H. Glauert: Aerodynamic Theory, 1935 Division L (Airplane Propellers), Chapter XI: Windmills and Fans

Wind power extraction fundamentals
https://home.uni-leipzig.de/en....ergy/energy-fundamen

Betz's Law
https://en.wikipedia.org/wiki/Betz%27s_law

Tip Speed Ratio
https://en.wikipedia.org/wiki/Tip-speed_ratio

Aerodynamics of Wind Turbines Book
https://www.amazon.com/Aerodyn....amics-Wind-Turbines-

Penn State Wind Turbine Aerodynamics Lesson
https://www.e-education.psu.edu/aersp583/node/469

Wind Power Physics youtube video
https://www.youtube.com/watch?v=qx_M0nvDIGU

Why do Wind Turbines Have Three Blades?
https://rosemary-barnes.medium.....com/why-do-wind-tur

Wind Power Fundamentals
http://web.mit.edu/windenergy/....windweek/Presentatio

Wind Power Explained
https://www.calcunation.com/bl....ogs.php/the-physics-

Drag Coefficient
http://dx.doi.org/10.1615/AtoZ.d.drag_coefficient

Reynolds Number and Drag
http://www2.eng.cam.ac.uk/~mpj....1001/learnfluidmecha

Reynolds Number
https://en.wikipedia.org/wiki/Reynolds_number

Viscosity of Air
https://en.wikipedia.org/wiki/Viscosity#Air



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