Not Swedish. Bohemian Celt actually. Was madly infatuated with a little Norwegian girl when we were in the 8th grade though. She told me ufda was being at the airport when your ship comes in.
As to your other question -- Fatigue stress is much higher in a VAWT than a HAWT. Inescapable. To quote Hugh Piggott http://www.fieldlines.com/comments/2004/1/20/103054/698/2?mode=alone;showrate=1 I'm going to paste in my standard reply to this question. Vertical axis wind turbines are very popular in universities and with many home-builders. Attractive features include the ability to take wind from any direction and the ability to site mechanical parts at ground level. In spite of a huge amount of research, vertical axis wind turbines have failed to become widely accepted. Low speed vertical axis wind turbines of the 'Savonius' type are useful for really basic simple rugged machines with low efficiency, and low rpm. But the same amount of effort put into a horizontal axis machine will yield much greater returns. High speed Darrieus 'egg-beater' or alternatively H-rotor type vertical axis (VAWT) wind turbines are popular in university engineering departments but have never been successful in the marketplace, except briefly in California. In brief, the main problem with high speed vertical axis wind turbines is the fact that the blades suffer from reverse buffeting by the wind every single revolution. This causes severe fatigue loading which shortens the life expectancy of blades. This is usually the main reason why they fail to become commercially viable. some vertical axis urls http://www.awea.org/faq/vawt.html (good overall comparison) http://www.solwind.co.nz/ mailto:[EMAIL PROTECTED] (leo laza is/was a VAWT fanatic) http://www.windside.com/painik/menu1.htm (check out the prices) http://www.southcom.com.au/~windmill/ (savonius) http://www.iteva.org.br/tecnologias/energetica/rotor/index.asp http://www.nexwindenergy.com http://home.inreach.com/integener/ http://www.massmegawatts.com/ http://www.ecoquestintl.com/eqwindtreepop.htm http://www.ropatec.com/en http://www.aerotecture.com/ there are good books available concerning Savonius rotors made of drums. One of the best is: Savonius Rotor Construction. J.A.Kozlowski. VITA USA. 1977. 0-86619-062-7. Available from http://www.vita.org 'PicoTurbine Deluxe Windmill Plans' text is a good one. Available from http://www.picoturbine.com. At 10:28 pm +0100 14/7/02, Christopher William Turner wrote: There was hard vertical test results (from 1979!) at http://www.sandia.gov/Renewable_Energy/wind_energy/topical.htm In rough summary, a 1.5m high x 1m diameter Savonius managed a Cp of 0.22-0.25 Two bucket with 0.1d overlap is best. Use 2, vertically stacked at 90degree rotation to get even torque. A Darrius managed a Cp of 0.3-0.35. NACA0015 airfoil seems good. Solidity 0.15 to 0.2. TSR 4-6. Not self starting. I think HAWTs manage Cp of 0.48 and use much less blade material. -- Christopher William Turner, http://www.cycom.co.uk/ Hugh Piggott http://www.scoraigwind.co.uk --- [EMAIL PROTECTED] wrote: > Kirk, > > There's nothing wrong with vertical-axis wind > turbines (VAWTs), in principle. > All turbines deal with "turbulent" loads more or > less. The problem is with > business attitudes-- companies dropped the VAWTs > when they were not looking > competitive, and now few people are willing to go > back and take a second look. > I think I know how to solve the VAWT problems when > somebody is ready. > > Now, to jog your sense of reality-- it may be that > the next move into "VAWTs" > will be for use under-water. You know, wave and > tide power. > > Are you Swedish? > (OOPS, forgive me, I guess we're a little off-topic, > aren't we! ) > > Ernie Rogers > > In a message dated 11/20/2004 11:07:48 AM Mountain > Standard Time, > [EMAIL PROTECTED] writes: > All the VAT I know about suffered fatigue and broke > due to reversal every revolution. It is a design > weakness. All you can do is select materials etc to > extend mtbf but it is built in. > I used to be enthusiastic about them as I wanted to > avoid the problems in the conventional designs. > They aren't the answer either. > > Ufda. > > Kirk __________________________________ Do you Yahoo!? The all-new My Yahoo! - Get yours free! http://my.yahoo.com _______________________________________________ Biofuel mailing list [EMAIL PROTECTED] http://wwia.org/mailman/listinfo.cgi/biofuel Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html Biofuel archives at Infoarchive.net (searchable): http://infoarchive.net/sgroup/biofuel/
