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I'm installing a Fourwinds-ii. It has large blade diameter and a speed brake that automatically deploys in high winds. They have good output. Good customer support too.
I made my choice by motoring aroound the harbor in Block Island and listening to the different wind generators.
Also we needed one that will protect itself in high winds when we aren't there. 2 years ago a friend measured the wind at 73 knots at the anchorage when a storm (not a named storm) went over. A little (noisy) generator could electrically short-circuit and shut itself down. A big one would need mechanical braking or it would destroy itself IMHO.
Until we start seeing variable pitch blades, speed brakes are essential unless you are always on the boat or you tie-off the generator when you are away. (If you aren't getting a mini-noisy one, you might want to ask the companies what wind speeds are included in their warranty.) Again, IMHO.
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Last edited by Bene505; 07-20-2010 at 06:37 AM.