The Physics of Windmill Design

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

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.

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

Wind power extraction fundamentals

Betz’s Law

Tip Speed Ratio

Aerodynamics of Wind Turbines Book

Penn State Wind Turbine Aerodynamics Lesson

Wind Power Physics youtube video

Why do Wind Turbines Have Three Blades?

Wind Power Fundamentals

Wind Power Explained

The Physics Behind Wind Turbines

Drag Coefficient

Reynolds Number and Drag

Reynolds Number

Viscosity of Air

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Minute Physics provides an energetic and entertaining view of old and new problems in physics — all in a minute!

Created by Henry Reich

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