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Air gap question | 8 comments (8 topical, editorial)
Re: Air gap question (3.00 / 0) (#7)
by TheCasualTraveler (a.miklos@yahoo.com) on Sun Mar 16th, 2008 at 10:34:50 AM MST
(User Info) http://thecasualtraveler.com/wind.htm

OK, the results.

     As I said I added the second steel disc to complete the flux circuit and that put the machine in stall. So I then moved the second steel disc out 1/8" (the thickness of a washer) and sure enough, stall was gone but power was still improved compared to before the second disc. It was an exceptional wind day yesterday, 10 to 20 with gusts around 30. In the lowest winds it was putting out about 1 amp with 2 to 3 amps being common and I saw 1 gust take it to 7.25 amps (12 volts). I'm very happy with the results and grateful for the experience and help from everyone. Thank you all.  Most of the math escapes me but I'm getting the "feel" for this stuff.

     As is I still have the 64" pvc blades so I need to carve a set of 6' blades and re-test. I "feel" I will then have to bring the disc back in half of what I moved it out. Or, maybe not. We'll see.

     I also have 12 more of the wedge magnets but was reluctant to epoxy them to a second disc for dual rotor thinking they might best be used on a 10" disc. I could remove the 12 I'm using on this 8" disc and make a new alt with 2 - 10" discs, 24 magnets total, and a stator of decent gauge wire instead of the #22 I'm using now, but I digress and besides right now I am studying the effects of what I have now.

     I have to add some type furling after the new blades and then the final step will be putting it on the higher roof of my house which will put the top of the blades at 35' above ground. As of now they are only about 22' above ground in turbulant air.

     Thanks ED for the parts and yes, I'm having fun!

Andy



Re: Air gap question (3.00 / 0) (#8)
by wpowokal on Mon Mar 17th, 2008 at 05:32:22 AM MST
(User Info)

Congratulations Andy you are gaining valuabe experience, I would go with the 10" discs.

allan down under
A life lived in fear is a life half lived.
[ Parent ]



Air gap question | 8 comments (8 topical, 0 editorial)

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