IMO, I think the rudders on the Blade need to be redesigned. A friend has several extra 18ht rudders and I have really thought about trying those out on the Blade.
Done. There were 2 generations of Blade Rudders produced and a 3rd developed for the Falcon.
The original was a slightly enlarged version of the style used on the Oz A class at the time. The second generation foil increased the section and provided a slight increase in the aspect ratio, all to improve lift and make the rudder less susceptible to stalling out. There were also some changes to the head to make it work better with the pull down system and the castings.
The very thin sections in theory have less drag. They are in practice a bit more sensitive to stalling (or cavitations) Pinching being the best way to stall them out, but also they are much less forgiving to radical control movements and junk in the water.
