View Single Post
 09-19-2012, 02:53 PM #58 A.Reader New User   Join Date: Sep 2012 Location: K'zoo Posts: 4 possible mistakes in spreadsheets @stoneage Thanks for your many technical posts. This is an interesting attempt to develop a new way of looking at the weight parameters of racquets. However, I believe there is a mistake in the formula in your effective_mass.xlsx spreadsheet. There is an extra factor of 2 in the denominator there. When you take that out, the plots become monotonic with 15/r and you get much larger effective masses on the right side. In the eqv_mass_norm.xlsx spreadsheet, I don't understand the expression for the reference racquet that you use in the denominator there. Can you explain how Ip for the reference racquet equals 320 (1033 + 50*r + r*r) ? Using I[end] = (M*L^2)/3 for a uniform rod, I get Ip = 320 (70*70/3 + r*r) for the reference racquet. This makes the curves look quite different. Anyways, thanks for posting something that was motivating enough to get me to finally de-lurk!