Wind Turbine Blades

To calculate the total kinetic energy of the area swept by the wind turbine, simply determine the kinetic energy of the "tube" of air going through the turbine. That is KE=0.5*M*V*V where V is the average wind velocity and M is the mass flow of air through the swept area. Then, for a rough order of magnitude, assume an efficiency of 15% for a 2- or 3-bladed horizontal axis turbine.

A 2-bladed turbine is actually the most efficient, but for operation in low winds, the starting torque of a three-bladed turbine is lower and the vibrational characteristics more favorable.

All of this is working off of vague memories from several years ago.

A wind mill (water pumping turbine) is designed to start pumping with little wind.

To prevent it from running too fast under high winds the centre of the turbine is offset on the swivel point. The effect is then that the wind wheel is forced sideways when the air flow is high and thus limits facing area.

Very familiar with them. They work very well, though do give up a lot of efficiency. They also make a lot of noise.

In a remote location, or a location where noise was not important, the old Aeromotor would be a good choice for a hydraulic pump.

Hello, I work for WindEnergy7.com and we have several different implementations of the three bladed horizontal wind turbines that we sell. More blades creates drag and turbulance. Also you need to run a turbine slow at or under 400 RPM is ideal. So, this is why we use direct drive PMA generators that are designed to make power at slow speeds of 400 RPM or less, this increases life of turbine parts, keeps down vibration, and makes less noise. When you think of turbine blade design, realize that the length of the blades gives you more leverage to the shaft. That's why these three bladed designs are superior to vertical turbines. Vertical has backside drag and not much leverage to the shaft and it creates a wind obstacle where a single blade custs into wind harnessing it without disrupting the power direction of the wind. HTH.

<>WindEnergy7.com

Wind Power Home Systems

Hi , does your company supply inverters etc ?

Could you contact me directly on my email please (michael@roof2000.com)

I have a special design of generater that I would like to discuss with you .

I looked on the maps and my location shows a 2 for southeast Illinois. Is that sufficient for wind power? I have close to 30 acres. Most of it is wooded. How close does the wind mill need to be to the house without the need to oversize the supply lines? How much and what type of maintenance is there for your set up?

I'm not sure what a "2" means. Is it increasing wind on a 1 to 5 basis? A 1 to 10? Or is it a decreasing basis where 1 would be the best and 5 (or 10) the worst? It all depends on which wind maps you are looking at - and there are a lot of different ones.

If you have to set a wind turbine to far away from the house try compressed air from the turbine to an air motor to make electricity.you can go a long distance with less cost.