On Sun, 14 Jul 2002, Kieren Johnstone wrote:

>Hi,
>
>I want to find out the best way (using fans) to lift my project (quite
>light, just the weight of the fans, a smallish PCB).  Tiltmeters would be
>added, and the PIC would provide stability (with tiltmeters?)- but my
>problem at the moment is determining which fan to use - 5,12,24VDC?  What
>sort of CFM (cubic feet/minute) would I need (there would be say 4 fans, one
>in each corner)?  What would be the best battery supply, rechargable NiCd?
>How could a PIC vary the supplied voltage (current?) to the fans to change
>the speed?  Or should I just use a relay (the fans would run off their own
>power supply, I assume).

www.draganfly.com

Peter

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