Russell McMahon wrote: >> the formula HP=(CD*Q*A*(V^3)*6.8)/10^6 > It is interesting to compare that formula to my recently noted > > Drag = 0.5 x Cd x Rho x A x V^2 Now where did I write down the conversion factor between lbf*mph and hp? :) Gerhard -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist