Beldar..... I used a beam reach for most of my tests and calculations. While the numbers indicate that it is theoretically possible, the Lateen Sail is not the best design for that purpose.... and if you change to a taller rig, then you've gotten away from that which is essentially Sunfish. The differences between the Laser and the Sunfish is that the Laser's rig is more efficient at higher boat speeds, while the Sunfish's rig provides it's best power at moderate boat speeds. It's a function of aspect ratio.... the Laser sail has a higher aspect ratio than the Sunfish. A good analogy would be a high RPM engine vs a lower RPM but more torque engine.... both show the same HP, but at different speeds.