The bow down attitude is the result of restrictions in the angle of the rudder foils and the different speeds upwind vs. downwind.
Upwind, the boats are relatively level; the boats are moving 25-30 kts. A higher angle of attack is required on the rudder foils to lift and stabilize the back of the boat.
Downwind, the speed increases to 35-40 kts; a lower angle of attack on the rudder foils is required to achieve the same lift, so the boats assume a bow-down attitude.
I wonder why they don't change the rudder foil angle of attack by raking the rudders just a little bit, like they do the main foils, unless changing the rudder rake is prohibited by the new rules.
