+1 - I came here to ask about the noise emitted by this "water boittle" turbine. A local neighbour has 4 small turbines (the kind typically used on boats) moun

+1 - I came here to ask about the noise emitted by this "water boittle" turbine. A local neighbour has 4 small turbines (the kind typically used on boats) mounted atop 14m masts, and they make a hell of a racket when the wind is strong enough to make them generate reasonable (read: rated) amounts of power (which is pretty seldom around here.) Frankly I doubt whether this machine is nett energy win over its lifespan. To me it looks more like a virtue-signalling device than something seriously meant to generate energy.