On Jun 23, 2011, at 10:32 AM, RussellMc wrote: > target is very low wind speed, trivial power out I want to do something like this. Some sort of convenient semi-=20 tubular piece of trash mounted on a discarded CD drive spindle motor =20 (or one at the top an one at the bottom?), perhaps with much of the CD =20 drive mechanics still intact. Put it on the roof and measure the =20 output... BillW --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .