"SignalFerret" wrote in message
news:XGqWe.23510$Hs6.8480@trnddc07...
D=sqrt[16*H^4 + 8*H^2*(B^2+T^2) + (B^2-T^2)^2]/(4*H)

It don't smell right. I haven't run numbers to check, but a quick check on
dimensions says it won't. D comes out in length^2 units, assuming it makes
sense to add length^4 + length^3.


In your case ('big H'), this gives D~.34148.

Cain't argue with it if the numbers come out good, though.