2018 Sisu Ski Fest: Saturday January 6th
Race start time is 9:00 am with a forecast temperature of -5 F. With the current forecast temperatures, a hard glide wax like Swix CH4 will be the optimal wax for the entire race.
The chart below shows the forecasted temperatures in the black line with the scale on the left. The predicted coefficient of friction for 4 different waxes is on the right hand axis. The fastest wax will be the one with the lowest coefficient of friction
The chart below shows the estimated time lost due to using a sub-optimal wax. The different colored bars are for different finishing times (slower skis will be on the course longer and will experience a different temperature profile than faster skiers). Three finishing times are shown (1.5 hrs, 2.0 hrs and 2.5 hrs).
CH4 is always the fastest and so has zero time lost. If Swix CH6 or Rex Blue is used they will have a 3 to 9 minute time penalty relative to CH4.