The Nacra 5.0 is a skeg boat - it was designed to sail without daggerboards. The deep, narrow hulls take their place.

While it can't point with the Nacras with boards (5.2, 5.5, 5.8, 6.0, F18) it certainly can go upwind. I belive the 5.0 can point higher than most other boardless boats, though.