S# Calculations

I’m trying to use the formula for S# 3.97210^(-DLR/5260.691*(log(SAD)-1)^0.8) but it doesnt seem to align with the sites S# results where changing the rig design to increase sail area (and consequently SA/Displacement) results in a decrease in S# rather than an increase. Can someone advise where i’ve gone wrong in the formula?

Hello Ashley, if using an excel spreadsheet, try this… S# =3.972*(10^(-[@[Dsp/LWL]]/526+(0.691*(LOG([@[SA/Dp]])-1)^0.8)))