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When was the Darrieus type machine invented?

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When was the Darrieus type machine invented?

(a) 1925

(b) 1932

(c) 1929

(d) 1948

This question was posed to me in an interview.

My enquiry is from Vertical Axis Wind Mill in portion Wind Energy of Energy Engineering

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Best answer
Correct answer is (a) 1925

Best explanation: Darrieus type machine was invented originally and patented in 1925 by G.J.M > Darrieus, a French engineer. The Darrieus wind mill is a vertical axis machine that has the same advantage of a modern rapidly rotating propeller type windmill, by use of an efficient airfoil, effectively intercepts large area of wind with a small blade area.

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