Joe, Twice the diameter, would be close to 1 to 4, right (THE SQUARE OF 2)? Agree that 2,500 might be close to normal speed. That would be something like 10,000 rpm for the alternator at normal speed. Talking about that the alternator would explode at 18,000 rpm is maybe an overstatement?
With the use of alternators in wind generators, I have never seen them classed at more then 6-8 Kw, but would not be surprised if they would not explode if you under extreme conditions get 12 Kw. With 10 m diameter, you would get a lot more than 12 Kw. I would guess, without calculations, that we are closer to 4-5 m diameter. This after looking at existing wind generators. When we talk about large wind, we are talking about 100's of Kw and diameters around 30 m. It was a while since I looked at wind, but it is a section on my web site. Hakan At 19:06 08/12/2006, you wrote: >Hi Hakan; > >I bet the pulley on the crankshaft is less than twice the >alternator's pulley diameter. Also the amount of time your engine >is reving above 2500 rpm is short compared to the normal. Anyways >they talk about low losses but the gearbox required to turn the >alternator that fast would be very lossy and what diameter of >propeller would be required to extract 12 kw from the average >wind? 10 meters? more? lol! > >Joe > >Hakan Falk wrote: >> >>Joe, >> >>How much are they spinning in a car? To me it looks like the wheel on >>the alternator is much smaller than the wheel on the car engine, >>could it be 1 to 4 or more? 4,000 rpm for the car engine is quite >>usual, so the alternator can not be far from 18,000 in normal >>conditions. Just a thought about the normal conditions for an >>alternator, or maybe I am wrong? >> >>Hakan >> >> >>At 17:09 08/12/2006, you wrote: >> >>> >>>Read that page carefully! It says the alternator can produce 12 >>>Kw........at 18,000 RPM!!! Good luck spiniing that thing that >>>fast. I'm sure the bearings would catch fire if the whole thing >>>doesn't explode first. Speeds that high require incredible >>>balancing and air bearing spindles. Buyer beware! >>> >>>Joe >>> >>>Kirk McLoren wrote: >>> >>>> >>>><http://www.hydrogenappliances.com/powerpmas.html>http://www.hydrogenappliances.com/powerpmas.html >>>> >>>> >>>> >>>> >>>> >>>>Access over 1 million songs - >>>><http://pa.yahoo.com/*http://us.rd.yahoo.com/evt=36035/*http://music.yahoo.com/unlimited/>Yahoo! >>>> >>>> >>>>Music Unlimited. >>>> >>>> >>>> >>>>_______________________________________________ >>>>Biofuel mailing list >>>><mailto:Biofuel@sustainablelists.org>Biofuel@sustainablelists.org >>>>http://sustainablelists.org/mailman/listinfo/biofuel_sustainablelists.org >>>> >>>>Biofuel at Journey to Forever: >>>><http://journeytoforever.org/biofuel.html>http://journeytoforever.org/biofuel.html >>>> >>>>Search the combined Biofuel and Biofuels-biz list archives >>>>(50,000 messages): >>>><http://www.mail-archive.com/biofuel@sustainablelists.org/>http://www.mail-archive.com/biofuel@sustainablelists.org/ >>>> >>>> >>>> >>> >>>_______________________________________________ >>>Biofuel mailing list >>><mailto:Biofuel@sustainablelists.org>Biofuel@sustainablelists.org >>>http://sustainablelists.org/mailman/listinfo/biofuel_sustainablelists.org >>> >>>Biofuel at Journey to Forever: >>><http://journeytoforever.org/biofuel.html>http://journeytoforever.org/biofuel.html >>> >>>Search the combined Biofuel and Biofuels-biz list archives (50,000 >>>messages): >>><http://www.mail-archive.com/biofuel@sustainablelists.org/>http://www.mail-archive.com/biofuel@sustainablelists.org/ >>> >> >> >> >> >>_______________________________________________ >>Biofuel mailing list >><mailto:Biofuel@sustainablelists.org>Biofuel@sustainablelists.org >>http://sustainablelists.org/mailman/listinfo/biofuel_sustainablelists.org >> >>Biofuel at Journey to Forever: >><http://journeytoforever.org/biofuel.html>http://journeytoforever.org/biofuel.html >> >>Search the combined Biofuel and Biofuels-biz list archives (50,000 messages): >><http://www.mail-archive.com/biofuel@sustainablelists.org/>http://www.mail-archive.com/biofuel@sustainablelists.org/ >> >> >> >_______________________________________________ >Biofuel mailing list >Biofuel@sustainablelists.org >http://sustainablelists.org/mailman/listinfo/biofuel_sustainablelists.org > >Biofuel at Journey to Forever: >http://journeytoforever.org/biofuel.html > >Search the combined Biofuel and Biofuels-biz list archives (50,000 messages): >http://www.mail-archive.com/biofuel@sustainablelists.org/ _______________________________________________ Biofuel mailing list Biofuel@sustainablelists.org http://sustainablelists.org/mailman/listinfo/biofuel_sustainablelists.org Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html Search the combined Biofuel and Biofuels-biz list archives (50,000 messages): http://www.mail-archive.com/biofuel@sustainablelists.org/
