The H-Rotor VAWT (Vertical Axis Wind Turbine) has no tail, furling system or slip rings (electrical rotary joints), the vertical configuration is capable of generating power at very high efficiencies (see ref.1). It has few parts and a fast build-time, the airfoil blades take less than 30 minuites to construct with a belt sander.
The H-Rotor VAWT has two airfoil blades, two arms, hub, electric generator, motor and braking system.
The controller monitors the wind speed with an anemometer and uses the motor to self-start the wind turbine in low wind speeds. The brake is activated during high wind speeds to prevent self-destruction.
This page will assist in the design and consruction of Darrieus H-Rotor airfoil blades.
wind speed (m/s)
( 4.8ft )
( 3.3ft )
( 5.91in )
( 0.71in )
use the + / - to select your wood thickness and length
Draw A and B lines (shown above) on your piece of wood with a pencil.
Download as .PDF
Background video : NASA,"All Alone in the Night - Time-lapse footage of the Earth as seen from the ISS", 2011
H-Rotor aerofoil efficiency data : U.S. Department of Energy,"Darrieus Wind Turbine Airfoil Configurations", Solar Energy Research Institute, June 1982
Beaufort deawings : “Over thousands of years sailors have learnt to estimate the speed of the wind just by looking about. This technique matured into what we now call the Beaufort Scale. The universe tells you everything you need to know about it as long as you are prepared to watch, to listen, to smell, in short to observe.”…. Howtoons 2006