Bird calls/what does this have to do with anything?

[Roger Jolly]

Hi Jim,
            This must qualify as one of the most learned dissertations that
I have seen on this very controversial topic.

A keeper for the files.

roger

Ron;
> Easy question actually. It is a distal approximation delved from the
African 
>Hooded Raven...you know the big black birds that shade the water by
spreading 
>their wings over their head so they can better see the fish they hunt?  The 
>distal approximation part comes the length of wing span which exceeds the 
>birds beak tip combined with total wing length from root to tip.
> Manufactureers used this proportion/ratio to determine where to stop the 
>dampers based on the theory, as far as the birds are concerned, that
anything 
>past their beak...(or damper stop point) is interesting but essentially 
>useless...therefore they might as well let it do what it wants to do and not 
>waste time and energy fooling with it.
> Unfortunately there are several sub-species of these Ravens and each have a 
>different beak-to-wingtip ratio.....obviously different manufacturers used 
>different sub-species of Ravens and consequently we have as many different 
>stop points for dampers as there were sub-species used.
> Although this, i.e Distal Raven formulae, is a rather well known fact in
the 
>circles of the intelligentsia of our craft I'm not quite sure just how the 
>rabbits come into play............Hmmm.
>Jim Bryant (FL)
> 
Roger Jolly
Saskatoon, Canada.
306-665-0213
Fax 652-0505