Aaaagh !!!
Definitely more than I wanted to know I didn't know.
An excellent start though.



        Russell

_________________________
        
> Russell,
> 
> This may be some help (then again perhaps not):
> 
> http://en.wikipedia.org/wiki/Atkinson_resistance
> 
> Regards,
> 
> Ken Mardle 


>> I'm seeking to find a formula which will allow me to very
>> approximately establish the pneumatic resistance of smooth walled
>> ducts at modest flow rates. ...

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