Here are polars for Amiina, a Splinter 21 with a split junk rig, filtered to remove changes of wind speed >0.7kts/second (S7) and direction +0.6 degs or -0.4 degs/second (A64) and taking the average of the top three boat speed values for each wind speed and TWA combination (Avg3), adjusted for downwash (C70D10) by adding 10 degrees to the TWA at 35 degrees, and tapering that off in a sine curve from 35 to 70 degrees and from 35 to 0 degrees.

First, with the curves smoothed to follow the high points of the unsmoothed data.

Next, the unsmoothed data.

Next the combined smoothed and unsmoothed curves at each wind speed.