Hi,
I learned something that explains why steering with fwd rudder is so hard.
The reason is the that the COE of a hull is at 1/3 of the hulls length. So the arm of the fwd rudder is half of the arm of the rear rudder, IF there are no other foils in the water.
Rocker does not change this fact, except if the situation is that the stern is lifting up and there was rocker.
A hull behaves like a foil in a water. The same works in big ships too, even if they are box shaped.
Now that there is "easyrig", it is impossible to make a harryproa neutral to steer ( rudders ponting ahead, still pointing straight) without any extra sails sheeted to a hull.
A friend from http://www.napa.fi/ gave me this lesson.
Well, a B2 stealth bomber does fly, why not a harryproa couldnt sail ;)