Variations in variable speed facts

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Your otherwise interesting article "Americans pursue patent in Europe" (Windpower Monthly, 2/98) had errors in the accompanying table which could lead to important trends in turbine development being overlooked.

Reference is made to Enercon E-55 and E-56 wind turbine types. These do not exist, though a new E-58 is rated at 850 kW and the 1.5 MW turbine is called E-66. Furthermore, I disagree with your "under development" classification in the table for the Tacke TW 1.5. Projects using this machine are scheduled for construction this year and two of them have been operating since 1996. It is perhaps correct to list the Windtec 646 in this category, but why not give a similar status to the Kramer K-15 and K-50, the Seewind 52 and Wind World 750? Windtec has also developed a 1.5 MW machine. Additionally, unlike all other turbines in the table, the 3 MW Kvaerner WTS 80 is known to be a very expensive non-commercial prototype, while the Fuhrländer 250 is a genuine stall control dual speed wind turbine.

Missing in the table is the small Dutch manufacturer, H-Energiesystemen, based in Swifterbant, which markets pitch controlled variable speed wind turbines in the range 0.6 kW to 150 kW. The company says it has installed about 400 turbines, mainly in developing country markets. You also omitted the DeWind 60 & 62, and HSW/Jacobs MD 65 & MD 70 megawatt class pitch control variable speed prototypes -- to be installed this year.

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