Jinx wrote:
> Thanks for suggestions so far. I've not yet clapped eyes on
> the actual mechanism but I think it was fairly well described
> 
> I probably will be writing s/w to control the angle at some
> stage but, until I can examine the turbine personally, how I'll
> do it is speculative
> 
> Strobing or light reflection sounds like a goer, I was never keen
> on electronics inside the shaft housing. Presumably (hopefully !!)
> the turbine is of solid construction and the blades will be stable.
> 
> One possible problem is where the measurement will have to
> take place. On the bench there are several options, but
> practicalities in the field may force an internal solution. Yuck.
> But results from bench-testing could be taken out in the field
> for reference (fingers crossed)
> 

Hi Jinx,
If you can fit this device in the turbine housing, the blade pitch 
should translate into distance measurement.

http://www.hvwtech.com/pages/products1a.asp?CatID=10&SubCatID=47&CurPage=1

Gaston
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