Scroll through U.S. NOAA Jan-Dec and Annual Wind Data
The subtle differences in the type of
blade you build depend on the wind you expect to encounter. A blade
spending most of it's time in 10-20 knot winds is different from
a blade that spends 1/3rd or more of it's time in 20-40 knot winds.
The tips are thinned and narrowed for higher wind speeds. Before designing
or ordering a blade, determine the type of wind you normally receive
for your region.
Click here for NOAA PDFdata for hundreds of U.S. locations.
Click here for the Wind vs Watts calculator to see what size airfoil you need to produce a consistent output of power.
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Wind roses summarise the occurrence of winds at a location, showing their strength, direction, and frequency. The percentage of calms is represented by the size of the centre circle. Each branch represents wind coming from that direction, with north to the top of the diagram. The branches are divided into segments of different thickness, which represent wind speed ranges from that direction. For example, the thinnest segment may represent winds between 1 and 10 km/h. The length of each branch segment is proportional to the percentage of winds in that speed range, blowing from that particular direction.
