> -----Original Message-----
> From: piclist-bounces@mit.edu On Behalf Of Richard Prosser
> Sent: Friday, May 18, 2007 3:56 AM
> 
> Aten't there anenometers that work like this? With a  oversize cup and
> a reference marker they can determine wind direction from the velocity
> variations.

There is one, the Rotavecta Wind Transducer from Raymarine (formerly
Raytheon Marine Division), I believe it is patented.

Paul  

> 
> RP
> 

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