Goofing around I noticed that the HPV value calculated on
http://powers.maccrafters.com/PPCalc.html
is incorrect. At least for the values of S35 St35 C56 which I hand
calculate to result in HPV = 126/4 (RU) = 32. The calculation performed
by the website returned a value of HPV = 18. Otherwise the values
calculated seemed accurate.
Alex K