• The top straight line is just a reference line
• Violet and dark red line = Finn Express 83 Charlotta (with diff Mains'ls)
• light blue = lurifax (Albin Express, OD)
• yellow = Fifty Fun (Comfortina 32 Spec)
• purple = Tarantella (Swan 37 Std)

Comments

These lines represent the windward/leeward VMG for four different boats racing in the Finnish IMS-series. As one can see, the performance line on a windward/leeward course is quite biased to heavier weather for the Finn Express, whereas the lines for the other boats are more balanced.