Dear David,

> From this I can deduce a formula for calculating string length / frequency
> / material / diameter, much like Arto's Super String Calculator:
>
> T = constant * F^2 * L ^2 * Pi * (0.5 * d)^2 * D
>
> T = Tension
> F = Frequency
> L = String Length
> d = String diameter
> D = Density of String material
>
> The constant has to be 0,04
> My question is: why 0,04? Coincidence, some fixed constant in nature or
> just a stupid question because I am missing something obvious?

Well, I cannot answer your question (and there is no such thing as a stupid 
question, ..., there are only stupid answers..., I hope this is not one of 
those...  ;-)

But this is the (JavaScrip) formula my calculator uses for the tension:

  T = (F*L*D)*(F*L*D)*(3.14159265*P/(9.81*1000000*1000000)) 

 T = Tension 
 F = Frequency 
 L = String Length 
 P = String diameter
 D = Density of String material

I got this formula years ago from a harpsichord maker...
And I am a "computer scientist", I do not know too much of the physical 
world... ;-)

Arto


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