Wind & Wet
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Vertical axis wind turbine models

3 blade rotor

This was very similar to the 2 blade rotor with a NACA0018 symmetrical section aerofoil with the chord line curved to match the radius using the aerofoil plotter page.
Radius
220mm
Number blades
3
Blade chord
100mm
Blade thickness
18mm
Blade thickness (%)
18%
Blade length
190mm
Frontal area
83600mm2
Density
0.68
Blade area / frontal area
Compared to the 2 blade rotors this starts well and runs smoothly.
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Links

VAWT information
http://www.memagazine.org/backissues/membersonly/jun04/features/apptowind/apptowind.html

Wikipedia VAWT page
http://en.wikipedia.org/wiki/Vertical_axis_wind_turbine

Airfoil coordinates
http://www.ae.illinois.edu/m-selig/ads/coord_database.html

VAWT pitch control
http://www.cyberiad.net/library/pdf/we1992_16_5.pdf

Pitch control
http://www.cyberiad.net/library/pdf/we1993_17_2.pdf

Small VAWT wind tunnel tests
http://eprints.whiterose.ac.uk/10229/1/Howell1.pdf

VAWT pitch control and airfoils
http://aeroguy.snu.ac.kr/cyclocopter/paper/SPIE2006.pdf
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