This post is the third of a series of posts describing how to build a home made wind generator.

Check the first post on How To Build The Blades

Check the second post on What Materials To Use To Build The Blades

OK, Let’s get into how to cut the blades

Using a 4” to 12” sewer PVC pipe, you will cut it quartering the pipe, and then you will cut out one blade, and use it as a template for cutting out the others. That will leave you with 4 blades (3 plus one spare).We are going to build a 3 blade assembly. You can use a jigsaw to cut the pipe. See the figure below

Cutting the line with a jigsaw

The first step in cutting out the blades is to mark the pattern on the pipe with a marker. A tape measure and a large piece of project cardboard or Bristol board works great for transferring your pattern.

Notice that the centerline is slightly offset when cutting the first blade. This is to catch the wind more effectively. This first blade will be used as a template for the two other blades. See the figure below.

Notice that this example design pattern is set for a 10 inch pipe; in this way a 4 feet long blade will be on one side 7” wide and on the other 5”. If you use smaller or larger pipe diameter, just add or subtract one half inch of width for every 2 inches of pipe diameter as in the table below.

Pipe Diameter	Blade width at hub	Blade width at tip
4″	5.5″	3.5″
6″	6″	4″
8″	6.5″	4.5″
10″	7″	5″
12″	7.5″	5.5″

You can then do a little extra smoothing and shaping using a belt sander, palm sander or just sand paper on the cut edges to try to make them smoother. Smooth the sharp corners at the tip of the blades as well. This will serve to make the air flow better, thereby creating a better airfoil.

Wooden blades

Wood is also a recommended material to make blades and cedar is a nice wood. The Eastern White Cedar and Western Red Cedar have the same characteristics of lightness, super strength, flexibility and superb outdoor weathering capabilities.

For the building of your homemade wind generator blades you will want to find planed, finished lumber as thin as you can, preferably only one inch in thickness.

If you can’t find one inch lumber, ask at the lumber yard if they will cut it down to that size for you. The lumber piece should be 6 inches wide and 4 feet long for a single blade.

Use a jigsaw with a wood blade of fine teeth. Make each blade the same by copying the pattern 3 times.

Just put a small spacer piece on the leading side of each blade to tilt the blade in the direction of the wind. A slight tilt of 10 degrees is fine. Use a small piece of wood or angled metal to achieve the results you want to make that blade spin.

In our next post we will be discussing on how to build de hub that holds the blades together.

If you need a complete blueprint on how to build a home made wind generator CLICK HERE

If not, that´s Ok, just keep on checking our series of posts to get the whole picture to start your own project.

Filed Under: Alternative Energy Sources , Wind Power Tagged with Air Flow, Belt Sander, Blade Width, Bristol Board, Building A Home, Capabilities, Cardboard, Centerline, Cutting Blade, Flexibility, Hub, Inch Pipe, Jigsaw, Lumber, Marker, Outdoor Weathering, Palm Sander, Pipe Diameter, Pvc Pipe, Sand Paper, Sharp, Style Text, Table Style, Tape Measure, Wind Generator, Wind Generator Blades