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Shrouded & Ducted Wind Turbines

Sheerwind Invelox: all hype, no substance

July 8, 2014,   by Mike Barnard

Sheerwind makes radically inappropriate comparisons between their long-disproven approach to wind generation and actually useful wind generation. The numbers show that they are likely about eighteen...

Category: Shrouded & Ducted Wind Turbines

Sheerwind Invelox: an informed look

June 23, 2014,   by Mike Barnard

The Sheerwind had never made any of their data and assessments public, so there was no meat to chew on, just hyperbolic statements in the popular press not dissimilar to the oddly aggrandizing...

Category: Shrouded & Ducted Wind Turbines

Business Day: Super DAWT investment winded by critics

February 16, 2014,   by Matt Nippert

A wind energy firms' claims it will revolutionise wind power have been questioned by critics following a US$55 million investment in it by the New Zealand Superannuation Fund.

Category: Shrouded & Ducted Wind Turbines, News on Large Wind, FloDesign-Ogin FloDesign-Ogin

FloDesign-Ogin Some Brief Comments

February 12, 2014,   by Paul Gipe

The following is an excerpt from my forthcoming book, Wind Power: Renewable Energy for Home, Farm, and Community. It is provided here in the public interest because of recent controversy...[more]

Category: Shrouded & Ducted Wind Turbines, Vortec, News on Large Wind, FloDesign-Ogin VortecFloDesign-Ogin

Vortec 7 DAWT Summary of Test Results

January 11, 2014,   by Paul Gipe

This summary reflects my view at the time. Key participants were acknowledging the technical failure of Vortec 7, but they couched their failure in arcane technical language at arcane conferences. [more]

Category: Vortec, Inventions & Questionable Wind Turbines Vortec

Wind Cube Squarely Over the Top (Now Re-Branded as Wind Sphere)

July 8, 2013,   by Paul Gipe

Is this another example of Federal capital subsidies driving exceptionally overpriced "wind turbines"?[more]

Category: Shrouded & Ducted Wind Turbines, LEED LEED

DAWT Rebranding as Compact wind acceleration turbine

July 5, 2013,   by Paul Gipe

WARNING: There’s an attempt to rebrand Diffuser-Augmented Wind Turbines (DAWT), also known as Shrouded Wind Turbines as Compact wind acceleration turbine. Why this is so isn’t clear. It is possible...[more]

Category: Shrouded & Ducted Wind Turbines

Diffuser Augmented Wind Turbine Theory--Some Comments

July 5, 2013,   by Paul Gipe

In the past I’ve singled out what are variously called Diffuser Augmented Wind Turbines (DAWT) or Shrouded Rotors for derision. Wind turbine engineers, manufacturers of commercial wind turbines,...[more]

Category: Shrouded & Ducted Wind Turbines

SkyWolf Wind Turbines

June 28, 2013,  

Gerald Brock, the "inventor" of Windtamer is back at it with a new company using the same Windtamer design.

Category: Windtamer

Arista Power: WindTamer 4.5 GT

June 28, 2013,  

The Windtamer turbine was still being promoted on Arista Power's web site.

Category: Windtamer

Photos of Shrouded & Ducted Wind Turbines Posted

April 22, 2013,   by Paul Gipe

Ducted or shrouded wind turbines have been invented and reinvented throughout the 20th century. Ducted turbines are often wrapped in mysterious, technical babble, such as diffuser augmentation, that...

Category: Shrouded & Ducted Wind Turbines

SkyWolf Wind Turbines (Windtamer)

July 4, 2011,  

Category: Shrouded & Ducted Wind Turbines, Windtamer

Elena Diffuser Augmented Wind Turbine (DAWT) Update

June 28, 2011,  

Zero, Null, Nada Generation in One Year--After one full year of operation, the Elena DAWT has produced zero net electricity.

Category: Shrouded & Ducted Wind Turbines

Green Investing: This is Why You Avoid Story Stocks

May 24, 2010,   by John Rubino

In retrospect, a little more skepticism would have been in order, because this is exactly the kind of thing you see constantly in hot markets. Revolutionary technology, lots of interest that will...

Category: Windtamer

Adeeb Saba assumes responsibility for product development at WindTamer Corporation

May 19, 2010,  

William A. Schmitz, Chief Executive Officer of WindTamer Corporation, said that, “The decision of the Board of Directors and me to no longer have Mr. Brock head the research and development of the...

Category: Windtamer

Elena Diffuser-Augmented Wind Turbine (DAWT)

May 7, 2010,   by Paul Gipe

Have Parisians Drunk the Kool-Aid?[more]

Category: Shrouded & Ducted Wind Turbines

Windtamer Hype Needs Trimmed: Betz Beaten Yet Again Raises Questions

December 6, 2009,   by Paul Gipe

Poor Albert Betz, the German physicist must be turning over in his grave. He's been beaten yet again.[more]

Category: Shrouded & Ducted Wind Turbines, Windtamer

Ducted or Augmented Turbines--Enflo

October 12, 2009,   by Paul Gipe

Ducted or shrouded wind turbines have been invented and reinvented throughout the 20th century.[more]

Category: Shrouded & Ducted Wind Turbines

Fantasy Wind Turbines or If It's Too Good To Be True . . .

July 20, 2009,   by Paul Gipe

Scams, Frauds, & Flakes--Tell-Tale Signs[more]

Category: News on Small Wind, Inventions & Questionable Wind Turbines, Shrouded & Ducted Wind Turbines, Vortec Vortec

WPM: Vortec Energy collapses -- economics questionable

August 1, 2001,  

Doubts about an unusual approach to turbine design have been proven right with the demise of Vortec Energy, launched in 1994 with strong hopes for its diffuser augmented wind turbine (DAWT) design....

Category: Vortec Vortec

Aerodynamic analysis and monitoring of the Vortec 7 diffuser-augmented wind turbine

January 13, 2000,   by Trevor Nash

Simplified one-dimensional arguments lead to predictions of speed-ups of about 2 and power augmentations of about 4, but such power levels have not been observed to date.

Category: Vortec Vortec

NZH: Vortec hits second wind with turbine energy technology

December 7, 1999,   by YOKE HAR LEE

Vortec Energy - after spending $5 million on what its chief describes as New Zealand's most expensive "sculpture" - has emerged with new wind-harnessing technology and made its first licensing deal....

Category: Vortec Vortec

Comments on the Vortec Diffuser Augmented Turbine

July 7, 1997,   by Paul Gipe

I was critical of the development of this wind turbine for several reasons: excessive hype, questionable sales of stock, and the aggressive style of the company's promoter. [more]

Category: Shrouded & Ducted Wind Turbines, Vortec Vortec

New Zealand Sunday Star-Times: Storm over Wind Energy (Vortec 7 DAWT)

July 6, 1997,   by Daniel Riordan

AS WIND turbine generator Vortec Energy gets ready for a 10-city roadshow: to promote its $10m public offering an overseas expert has warned small investors to steer clear, saying the company's...[more]

Category: Vortec, Inventions & Questionable Wind Turbines Vortec

NZSM: Getting the Wind Up

June 1, 1997,  

Despite the questions and scepticism, hopes for the new machine remain high, with Vortec predicting that the full-scale machines will produce electricity at about 4 cents/kWhr, or about half that of...

Category: Vortec Vortec

Concentrating Windsystems - Sense or Nonsense?

May 20, 1997,   by Heiner Doerner

Since 1996 we have a "new" old, huge, new-fangled saurian, a device erected in New Zealand. . .

Category: Shrouded & Ducted Wind Turbines, Vortec Vortec

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