rudolf: have you thought about replacing the rudders with ones that can generate more lift, either by using a different NACA section and/or by lengthening them?
relatedly, with the existing rudders and "keels" (dagger boards you mean?), how much leeway do you make? if the leeway is not too much, then you're right-- would be better to move the rudders further towards the end of the boat. but if it is too much, then making them generate more lift would fix both the leeway and the luffing tendency simultaneously.
ben
weta #358
and thinking hard about a big harryproa
> On Blind Date we built rudders much like what you have drawn. As the beams are much wider on BD we have rudder boxes outside the beams but the general idea is the same. Problem is the steering action of these rudders is not good. I suspect this is because they are too close to the lenghtwise centre of the boat. They may also be located too far away from the lw hull.
> Fact is the rudders can't deal with the luffing tendency the boat has.
> When we added a keel this got somewhat better.