Here is my analysis of 3 and 4 bladed turbines. I sometimes heard of the question of 3 vs 4 blades on traditional windgenerators (HAWT) and even helicopters and airplane propellers …so the question is now what can be the difference of using 3 or 4 blades on a VAWT. This video is about what I currently thought up. With the 3 bladed turbine, the blades receive more uninterupted wind force as it rotates. At a certain angle the wind force will begin to get interrupted by another blade, and at another certain angle, the wind force is completely interrupted by that blade. The most basic fact is obvious, that the angular sepeartion of the 3 bladed system is 120 degrees and the angular sepeartion of the 4 bladed system is 90 degrees. When the blade is 90 degrees perpendicular (a right angle) to the wind max. wind force is upon the blade due to the large surface area. From this point, with the 3 bladed system the blade can rotate 60 degrees before being completely “blocked” by another blade. With the 4 bladed system, the angle is only 45 degrees. The only advantage of the 4 blade system that I can think of right now is that the blade perpendicular to the wind happens slightly more often per revolution with that system; providing another quick “pulse” of force and the corresponding pulse in rotational speed and torque of the turbine at this point. You might ask… What about a 2 bladed turbine system with the blades seperated by 180 degrees? Each blade will receive “more time in …

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Obey The Global Warming Basic Tee in Black,T-shirts for Men:… More >>

Obey The Global Warming Basic Tee in Black,T-shirts for Men, Extra Large,Black

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Learn how to start and maintain a garden in this free gardening video. Expert: Tia Pinney Bio: Tia Pinney is a Teacher Naturalist and Adult Program Coordinator at Mass Audubons Drumlin Farm Wildlife Sanctuary in Lincoln, Massachusetts. Filmmaker: Christian Munoz-Donoso

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This article will describe how solar energy is created and cover some of its basic principles.

Solar energy is created by light and heat which is emitted by the sun, in the form of electromagnetic radiation.

With today’s technology, we are able to capture this radiation and turn it into usable forms of solar energy – such as heating or electricity.

Although one could go into technical dissertations on the subject of electromagnetic radiation, how it is converted into solar energy, and the exact qualities of its electromagnetic rays, this is not something the average person needs or wants to know.

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Learn how to start and maintain a garden in this free gardening video. Expert: Tia Pinney Bio: Tia Pinney is a Teacher Naturalist and Adult Program Coordinator at Mass Audubons Drumlin Farm Wildlife Sanctuary in Lincoln, Massachusetts. Filmmaker: Christian Munoz-Donoso

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Learn how to start and maintain a garden in this free gardening video. Expert: Tia Pinney Bio: Tia Pinney is a Teacher Naturalist and Adult Program Coordinator at Mass Audubons Drumlin Farm Wildlife Sanctuary in Lincoln, Massachusetts. Filmmaker: Christian Munoz-Donoso

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