Articles by

Paul Gipe

Figure 9 from albert betz's famous paper on windmill design in light of modern research, 1927. this figure illustrates lift and drag relative to tip speed ratio, describing a very low speed turbine, a

Betz: Everything You Need to Know about Wind Turbines Was Written in 1927

By

Paul Gipe

Yes, I’ve written about this subject once before, Everything You Need to Know about Wind Energy Was Written in 1957!, but I am moving the date back thirty years in the light of more research. The more I learn about wind energy, the more I realize how little I know.
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Darrieus and His Vertical-Axis Wind Turbines (VAWTs)

By

Paul Gipe

Largely forgotten today, Georges Jean Marie Darrieus was one of France’s great engineers. While he is mostly known in the English-speaking world for his patent on vertical-axis wind turbines (VAWTs), he was a prolific inventor in a number of fields from ballistics to turbo-alternators.

Factcheck: How much power will UK electric vehicles need?

By

Paul Gipe

For example, in February, the Times claimed that the UK would need 20 new nuclear plants to cope with demand from EVs. The article’s claim, repeated by the Mail Online, was later removed with a correction acknowledging a “significant miscalculation”.
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Photos of Dabiri VAWT Test Site—Wing Power Turbines are Down

By

Paul Gipe

Oh the ways of the wind. It blows where it will--or something to that effect. We were on our way to pick cherries. That’s a fairly innocuous activity. From Bakersfield we had to cross the Antelope Valley to reach Palmdale. Well, I thought. I might as well stop by Dr. John O. Dabiri’s test site and take some pictures of his experiment in “schooling” wind turbines.
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SheerWind Invelox Demo Turbine in Need of Demolition

By

Paul Gipe

The Chaska, Minnesota promoter of a ducted wind turbine appears to have fallen on hard times. The fabric covering of the intake duct for their demonstration turbine is torn and in disrepair and the rotor in the duct was not turning notes a passerby who was curious about the highly-hyped design.
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Wind Day in Woodstock, Ontario

By

Paul Gipe

York University’s International Renewable Energy Academy designated 29 June as the “wind day” on their week-long program.
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Dueling Wind Ties in Woodstock

By

Paul Gipe

The 29 June was the “wind day” for York University’s International Renewable Energy Academy. As the featured speaker to start the day I donned one of my favorite wind tie.
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Porterville Electric Bus Photos

By

Paul Gipe

Rowell saw the bus, recognized its significance, and took a series of photos. He says the electric bus was on its way back to Porterville after a promotional tour of the Los Angeles area.
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Overview of Wind Energy for the International Renewable Energy Academy

By

Paul Gipe

Presentation by Paul Gipe for York University's International Renewable Academy on 22 June 2017. Check against delivery.
The silent revolution in wind energy is the advent of large diameter rotors driving relatively small generators.

Wind’s Silent Revolution Grows in Germany with More High Specific Area Turbines

By

Paul Gipe

While thumbing through German renewables magazine, Sonne Wind&Wärme, a table jumped out at me. The table confirmed that the Silent Wind Revolution that French renewables expert Bernard Chabot first noticed several years ago is continuing.

Finally a New Generation of VAWT Busters Has Arrived: Debunking IceWind

By

Paul Gipe

The onslaught of super-dooper new windmill inventions is never ending. Frankly it’s wearing out us old timers. We can’t keep up with the damn things. We try to ignore them but our friends and colleagues keep throwing them in our faces, forcing us to react.

Revenge of PURPA

By

Paul Gipe

The much maligned Public Utility Regulatory Policies Act, PURPA for short, is back in the news. Not that it ever went away. PURPA has been the foundation stone upon which renewable electricity generation has been built in the United States.