Product brochure by a British company for Cleanfield’s 3.5 kW VAWT shown on an unusual monopole tower. To my knowledge the Cleanfield turbine was never certified under the British FIT program. This brochure is unusual because it shows both an expected power curve and an energy curve–data hard to come by in North America at the time.
cleanfield-energy-v3.5-vawt
http://ocip.co.uk/downloads/cleanfield-energy/cleanfield-energy-v3.5-vawt.pdf (link offsite)