Okay guys... Heres what I come up with. I'm going to assume a Youngs modulus for piano wire in accordance with McFerrin, which is the lowest I've run into so far out there. For a 0.8 mm Ø string of 150 mm long speaking length, 50 mm back length... and tension at 150 with zero deflection, a 5 mm deflection will increase tension to 189 lbs, cause a frequency change of 248 hz (from 2057 to 2305) and impose a 28 lb bearing force on the point of deflection. For a string of
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