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Lenz2 wind tunnel tests are done
windstuffnow:
Hi Bruce,
I'm not sure if they did, I really didn't want to get to involved with the "bells and whistles" because it was expensive enough for the basics. For the most part, my roof mounted unit makes little to no noise in average winds. You can hear a mild "growl" while its charging but nothing I'd call a problem. The only real problem I've had with it so far is that my "static" balance job wasn't as good as I thought and in high winds it has a very distinctive vibration that echo's through the house. Since the alternator on that one isn't super efficient it tends to overpower it even when shorted. So a better alternator and absolutely a better balance job would cure the problem.
.
wayne:
Hi Ed
I must say I am always impressed with your test. Nice job and hope you carry it further. My small 12 inch is finally ready for a test and on ceiling fan motor, and finally found the problem with my 2 foot one. hope to put together again tonight and test indoors, if all looks good then on van. will post pics later.
Wayne
johnlm:
Ed,
Am I correct to assume that the power levels are real dc (ac?) power into a resistive load and not power into a battery? Your results are impressive.
John
windstuffnow:
It is DC going into a battery with a load.
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windstuffnow:
Looking forward to hearing your results on the small ones. I built a 10 inch diameter x 12 inch tall one to play around with, I haven't built an alternator for it yet but I'm looking for a fairly consistant 4 watts from it for another project...
I had similar problems as you did with this little one, where it wanted to bobble back and forth before starting. I changed the wing angle and it starts right up in a very mild breeze now. I think the smaller ones could use a bit more wing area, they don't make alot of power to begin with and have a bit more to overcome than the larger ones ( bearing grease ).
Gotta put my toys back in the toybox for a while and get back to work... The next Lenz2 is going to be extreemly facinating...
.
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